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Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Numerical Aerodynamic Optimization Incorporating Laminar-Turbulent Transition Prediction  

E-Print Network [OSTI]

Numerical Aerodynamic Optimization Incorporating Laminar-Turbulent Transition Prediction J. Driver-dimensional Newton­Krylov aerodynamic shape optimization algorithm is applied to several optimization problems a striking demonstration of the capability of the Newton­ Krylov aerodynamic optimization algorithm to design

Zingg, David W.

2

Aerodynamic Design for Swept-wing Laminar Flow  

E-Print Network [OSTI]

This work describes and compares processes for swept-wing laminar flow control (SWLFC) aerody-namic design. It focuses on results obtained during the preliminary outer-mold-line (OML) design of the Subsonic Aircraft Roughness Glove Experiment...

Belisle, Michael Joseph

2013-11-08T23:59:59.000Z

3

Error estimation and anisotropic mesh refinement for 3d laminar aerodynamic flow simulations  

E-Print Network [OSTI]

Error estimation and anisotropic mesh refinement for 3d laminar aerodynamic flow simulations Tobias Leichta,b , Ralf Hartmann,a,b aInstitute of Aerodynamics and Flow Technology, DLR (German Aerospace Center-dimensional laminar aerodynamic flow simulations. The optimal order symmetric interior penalty discontinuous Galerkin

Hartmann, Ralf

4

Hybrid method for aerodynamic shape optimization in automotive industry  

E-Print Network [OSTI]

Hybrid method for aerodynamic shape optimization in automotive industry Freedeerique Muyl April 2003; accepted 4 June 2003 Abstract An aerodynamic shape optimization tool for complex industrial reasons, concerns car manufacturers. Consequently, the improvement of the aerodynamics of car shapes, more

Dumas, Laurent

5

Aerodynamic Shape Design of Nozzles Using a Hybrid Optimization Method  

E-Print Network [OSTI]

A hybrid design optimization method combining the stochastic method based on simultaneous perturbation stochastic approximation (SPSA) and the deterministic method of Broydon-Fletcher-Goldfarb-Shanno (BFGS) is developed ...

Xing, X.Q.

6

Aerodynamic Shape Design of Transonic Airfoils Using Hybrid Optimization Techniques and CFD  

E-Print Network [OSTI]

This paper will analyze the effects of using hybrid optimization methods for optimizing objective functions that are determined by computational fluid dynamics solvers for compressible viscous flow for optimal design of ...

Xing, X.Q.

7

Advanced Flow Diagnostics and Experimental Aerodynamics Laboratory Department of Aerospace Engineering  

E-Print Network [OSTI]

Dr. Hui HU Advanced Flow Diagnostics and Experimental Aerodynamics Laboratory Department-inspired flows, bioinspired aerodynamic designs for micro-air-vehicle (MAV) applications. ­ Microfluidics, micro. ­ Low-speed aerodynamics, laminar boundary layer separation, transition and flow control. ­ Wind

Hu, Hui

8

AEROSPACE SCIENCES Applied aerodynamics  

E-Print Network [OSTI]

AEROSPACE SCIENCES Applied aerodynamics This year saw significant progress in industry, research labs, and academia in the development of flow-control concepts, novel configuration aerodynamic concepts, and aerodynamic im- provement technologies for enhancing the fuel efficiency and performance

Xu, Kun

9

CFD calculations of S809 aerodynamic characteristics  

SciTech Connect (OSTI)

Steady-state, two-dimensional CFD calculations were made for the S809 laminar-flow, wind-turbine airfoil using the commercial code CFD-ACE. Comparisons of the computed pressure and aerodynamic coefficients were made with wind tunnel data from the Delft University 1.8 m x 1.25 m low-turbulence wind tunnel. This work highlights two areas in CFD that require further investigation and development in order to enable accurate numerical simulations of flow about current generation wind-turbine airfoils: transition prediction and turbulence modeling. The results show that the laminar-to-turbulent transition point must be modeled correctly to get accurate simulations for attached flow. Calculations also show that the standard turbulence model used in most commercial CFD codes, the k-{epsilon} model, is not appropriate at angles of attack with flow separation.

Wolfe, W.P. [Sandia National Labs., Albuquerque, NM (United States); Ochs, S.S. [Iowa State Univ., Ames, IA (United States)

1997-01-01T23:59:59.000Z

10

Aerodynamics Antony Jameson  

E-Print Network [OSTI]

Chapter 11 Aerodynamics Antony Jameson Stanford University, Stanford, CA, USA 1 Focus Multidimensional Domains 359 6 Time-stepping Schemes 365 7 Aerodynamic Shape Optimization 379 8 Related Chapters 400 Acknowledgment 400 References 400 1 FOCUS AND HISTORICAL BACKGROUND 1.1 Classical aerodynamics

Jameson, Antony

11

Experimental aerodynamics research on a hypersonic vehicle  

SciTech Connect (OSTI)

Aerodynamic force and moment measurements and flow visualization results are presented for a hypersonic vehicle configuration at Mach 8. The basic vehicle configuration is a spherically blunted 10[degree] half-angle cone with a slice parallel with the axis of the vehicle. On the slice portion of the vehicle, a flap could be attached so that deflection angles of 10[degree], 20[degree] and 30[degree] could be obtained. All of the experimental results were obtained in the Sandia Mach 8 hypersonic wind tunnel for laminar boundary layer conditions. Flow visualization results include shear stress sensitive liquid crystal photographs, surface streak flow photographs (using liquid crystals), and spark schlieren photographs and video. The liquid crystals were used as an aid in verifying that a laminar boundary layer existed over the entire body. The surface flow photo-graphs show attached and separated flow on both the leeside of the vehicle and near the flap. A detailed uncertainty analysis was conducted to estimate the contributors to body force and moment measurement uncertainty. Comparisons are made with computational results to evaluate both the experimental and numerical results. This extensive set of high-quality experimental force and moment measurements is recommended for use in the calibration and validation of relevant computational aerodynamics codes.

Oberkampf, W.L.; Aeschliman, D.P.; Tate, R.E.; Henfling, J.F.

1993-04-01T23:59:59.000Z

12

Experimental aerodynamics research on a hypersonic vehicle  

SciTech Connect (OSTI)

Aerodynamic force and moment measurements and flow visualization results are presented for a hypersonic vehicle configuration at Mach 8. The basic vehicle configuration is a spherically blunted 10{degree} half-angle cone with a slice parallel with the axis of the vehicle. On the slice portion of the vehicle, a flap could be attached so that deflection angles of 10{degree}, 20{degree} and 30{degree} could be obtained. All of the experimental results were obtained in the Sandia Mach 8 hypersonic wind tunnel for laminar boundary layer conditions. Flow visualization results include shear stress sensitive liquid crystal photographs, surface streak flow photographs (using liquid crystals), and spark schlieren photographs and video. The liquid crystals were used as an aid in verifying that a laminar boundary layer existed over the entire body. The surface flow photo-graphs show attached and separated flow on both the leeside of the vehicle and near the flap. A detailed uncertainty analysis was conducted to estimate the contributors to body force and moment measurement uncertainty. Comparisons are made with computational results to evaluate both the experimental and numerical results. This extensive set of high-quality experimental force and moment measurements is recommended for use in the calibration and validation of relevant computational aerodynamics codes.

Oberkampf, W.L.; Aeschliman, D.P.; Tate, R.E.; Henfling, J.F.

1993-04-01T23:59:59.000Z

13

Joint computational and experimental aerodynamics research on a hypersonic vehicle  

SciTech Connect (OSTI)

A closely coupled computational and experimental aerodynamics research program was conducted on a hypersonic vehicle configuration at Mach 8. Aerodynamic force and moment measurements and flow visualization results were obtained in the Sandia National Laboratories hypersonic wind tunnel for laminar boundary layer conditions. Parabolized and iterative Navier-Stokes simulations were used to predict flow fields and forces and moments on the hypersonic configuration. The basic vehicle configuration is a spherically blunted 10{degrees} cone with a slice parallel with the axis of the vehicle. On the slice portion of the vehicle, a flap can be attached so that deflection angles of 10{degrees}, 20{degrees}, and 30{degrees} can be obtained. Comparisons are made between experimental and computational results to evaluate quality of each and to identify areas where improvements are needed. This extensive set of high-quality experimental force and moment measurements is recommended for use in the calibration and validation of computational aerodynamics codes. 22 refs.

Oberkampf, W.L.; Aeschliman, D.P.; Walker, M.M.

1992-01-01T23:59:59.000Z

14

The Aerodynamic Forces On Misaligned Platoons  

E-Print Network [OSTI]

M. , Tokumaru, P. , 1997, Aerodynamic benefits from close-Mason, W.T. , (Ed. ): Aerodynamic Drag Mechanisms of BluffBrowand, F. , 1995, The aerodynamic performance of platoons;

Marcu, Bogdan; Browand, Fred

1998-01-01T23:59:59.000Z

15

Predicting aerodynamic characteristic of typical wind turbine airfoils using CFD  

SciTech Connect (OSTI)

An investigation was conducted into the capabilities and accuracy of a representative computational fluid dynamics code to predict the flow field and aerodynamic characteristics of typical wind-turbine airfoils. Comparisons of the computed pressure and aerodynamic coefficients were made with wind tunnel data. This work highlights two areas in CFD that require further investigation and development in order to enable accurate numerical simulations of flow about current generation wind-turbine airfoils: transition prediction and turbulence modeling. The results show that the laminar-to turbulent transition point must be modeled correctly to get accurate simulations for attached flow. Calculations also show that the standard turbulence model used in most commercial CFD codes, the k-e model, is not appropriate at angles of attack with flow separation. 14 refs., 28 figs., 4 tabs.

Wolfe, W.P. [Sandia National Labs., Albuquerque, NM (United States); Ochs, S.S. [Iowa State Univ., Ames, IA (United States). Aerospace Engineering Dept.

1997-09-01T23:59:59.000Z

16

AIAA 20033498 Viscous Aerodynamic Shape  

E-Print Network [OSTI]

AIAA 2003­3498 Viscous Aerodynamic Shape Optimization of Wings including Planform Variables Kasidit Aerodynamics Conference Orlando, Florida/June 23­26, 2003 For permission to copy or republish, contact­4344 #12;VISCOUS AERODYNAMIC SHAPE OPTIMIZATION OF WINGS INCLUDING PLANFORM VARIABLES Kasidit Leoviriyakit

Jameson, Antony

17

aiaa applied aerodynamics: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Aerodynamic Engineering Websites Summary: AIAA 96-0409 Automatic Aerodynamic Optimization on Distributed Memory Architectures Antony Jameson-0409 Automatic Aerodynamic...

18

Fifteen Lectures on Laminar and Turbulent Combustion  

E-Print Network [OSTI]

Fifteen Lectures on Laminar and Turbulent Combustion N. Peters RWTH Aachen Ercoftac Summer School in Combustion Systems 1 Lecture 2: Calculation of Adiabatic Flame Temperatures and Chemical Equilibria 20: Laminar Diffusion Flames: Different Flow Geometries 156 Lecture 11: Turbulent Combustion: Introduction

Peters, Norbert

19

Computational Aerodynamics and Aeroacoustics for Wind Turbines  

E-Print Network [OSTI]

Computational Aerodynamics and Aeroacoustics for Wind Turbines #12;#12;Computational Aerodynamics and Aeroacoustics for Wind Turbines Wen Zhong Shen Fluid Mechanics Department of Mechanical Engineering TECHNICAL Shen, Wen Zhong Computational Aerodynamics and Aeroacoustics for Wind Turbines Doctor Thesis Technical

20

Low Speed Unsteady Aerodynamics Soumitra Banerjee*  

E-Print Network [OSTI]

Low Speed Unsteady Aerodynamics Soumitra Banerjee* Virginia Polytechnic Institute and State University, Blacksburg, Virginia, 24061 Unsteady aerodynamics is the study of fluid flow, where the flow field changes with time. The unsteadiness is significant in many aerodynamic applications; few examples

Patil, Mayuresh

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Freight Wing Trailer Aerodynamics  

SciTech Connect (OSTI)

Freight Wing Incorporated utilized the opportunity presented by this DOE category one Inventions and Innovations grant to successfully research, develop, test, patent, market, and sell innovative fuel and emissions saving aerodynamic attachments for the trucking industry. A great deal of past scientific research has demonstrated that streamlining box shaped semi-trailers can significantly reduce a truck's fuel consumption. However, significant design challenges have prevented past concepts from meeting industry needs. Market research early in this project revealed the demands of truck fleet operators regarding aerodynamic attachments. Products must not only save fuel, but cannot interfere with the operation of the truck, require significant maintenance, add significant weight, and must be extremely durable. Furthermore, SAE/TMC J1321 tests performed by a respected independent laboratory are necessary for large fleets to even consider purchase. Freight Wing used this information to create a system of three practical aerodynamic attachments for the front, rear and undercarriage of standard semi trailers. SAE/TMC J1321 Type II tests preformed by the Transportation Research Center (TRC) demonstrated a 7% improvement to fuel economy with all three products. If Freight Wing is successful in its continued efforts to gain market penetration, the energy and environmental savings would be considerable. Each truck outfitted saves approximately 1,100 gallons of fuel every 100,000 miles, which prevents over 12 tons of CO2 from entering the atmosphere. If all applicable trailers used the technology, the country could save approximately 1.8 billion gallons of diesel fuel, 18 million tons of emissions and 3.6 billion dollars annually.

Graham, Sean (Primary Investigator); Bigatel, Patrick

2004-10-17T23:59:59.000Z

22

Integrated External Aerodynamic and Underhood Thermal Analysis...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

External Aerodynamic and Underhood Thermal Analysis for Heavy Vehicles Integrated External Aerodynamic and Underhood Thermal Analysis for Heavy Vehicles 2012 DOE Hydrogen and Fuel...

23

Modelling and Simulation in Aerodynamic Design  

E-Print Network [OSTI]

Modelling and Simulation in Aerodynamic Design In different kinds of aerodynamic design elements is too complex. Aerodynamic properties of different airfoils are found from either numerical turbine blade, two design features are important. The aerodynamic design attempts to optimize the blade

Mosegaard, Klaus

24

Aerodynamics at the Particle Level  

E-Print Network [OSTI]

This paper is intended to clarify some of the rather well-known aerodynamic phenomena. It is also intended to pique the interest of the layman as well as the professional. All aerodynamic forces on a surface are caused by collisions of fluid particles with the surface. While the standard approach to fluid dynamics, which is founded on the fluid approximation, is effective in providing a means of calculating various behavior and properties, it begs the question of causality. The determination of the causes of many of the most important aerodynamic effects requires a microscopic examination of the fluid and of the surface with which it interacts. The Kutta-Joukowski theorem is investigated from first physical principles. It is noted that the circulation does not arise as a physical phenomenon. Various aerodynamic devices are discussed, e.g. rocket engine exhaust diffuser and the perfume atomizer.

Charles A. Crummer

2012-09-23T23:59:59.000Z

25

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow  

E-Print Network [OSTI]

UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow Niels N codes for wind turbines utilize aerodynamics based on BEM methods, see [1, 2]. For modern large scale

26

Explanation and discovery in aerodynamics  

E-Print Network [OSTI]

The purpose of this paper is to discuss and clarify the explanations commonly cited for the aerodynamic lift generated by a wing, and to then analyse, as a case study of engineering discovery, the aerodynamic revolutions which have taken place within Formula 1 in the past 40 years. The paper begins with an introduction that provides a succinct summary of the mathematics of fluid mechanics.

Gordon McCabe

2005-12-22T23:59:59.000Z

27

FREE CONVECTIVE LAMINAR FLOW WITHIN THE TROMBE WALL CHANNEL  

E-Print Network [OSTI]

LAMINAR FLOW WITHIN THE TROMBE WALL CHANNEL H. Akbarf andLAMINAR FLOW WITHIN THE TROMBE WALL CHANNEL H. Akbari andchannel surfaces of the Trombe wall has been investigated.

Akbari, H.

2011-01-01T23:59:59.000Z

28

The Aerodynamic Performance Of Platoons: A Final Report  

E-Print Network [OSTI]

OF CALIFORNIA, BERKELEY The Aerodynamic Performance of1995 ISSN 1055-1425 The Aerodynamic Performance of Platoons10 October 1995 The Aerodynamic Performance of Platoons A

Zabat, Michael; Stabile, Nick; Farascaroli, Stefano; Browand, Frederick

1995-01-01T23:59:59.000Z

29

The Aerodynamics of Deforming Wings at Low Reynolds Number  

E-Print Network [OSTI]

and Karl G. Gotz. Unsteady aerodynamic performance of model26] G. Du and M. Sun. Aerodynamic effects of corrugation andof flexibility on the aerodynamic performance of a hovering

Medina, Albert

2013-01-01T23:59:59.000Z

30

Transient Vehicle Aerodynamics In Four-car Platoons  

E-Print Network [OSTI]

7 Platoon Aerodynamics 7.1 Drag Coefficient . . . . . . . .0 . Savaa. Transient aerodynamics in vehicle interactions:implications in platoon aerodynamics. Masters thesis,

Chen, A. L.; Savas, Omer; Hedrick, Karl

1997-01-01T23:59:59.000Z

31

LAMINAR BURNING VELOCITY OF GASOLINES WITH ADDITION OF ETHANOL  

E-Print Network [OSTI]

1 LAMINAR BURNING VELOCITY OF GASOLINES WITH ADDITION OF ETHANOL P. Dirrenberger1 , P.A. Glaude*1 (2014) 162-169" DOI : 10.1016/j.fuel.2013.07.015 #12;2 LAMINAR BURNING VELOCITY OF GASOLINES, Sweden Abstract The adiabatic laminar burning velocities of a commercial gasoline and of a model fuel (n

Boyer, Edmond

32

Laminar Entrained Flow Reactor (Fact Sheet)  

SciTech Connect (OSTI)

The Laminar Entrained Flow Reactor (LEFR) is a modular, lab scale, single-user reactor for the study of catalytic fast pyrolysis (CFP). This system can be employed to study a variety of reactor conditions for both in situ and ex situ CFP.

Not Available

2014-02-01T23:59:59.000Z

33

Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound  

E-Print Network [OSTI]

Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound Instructor-surface interaction. Spring 2011 1 ME706 Acoustics and Aerodynamic Sound #12;Spring 2011 ME706 Acoustics and Aerodynamic Sound Students are expected to: · Exhibit a level of mathematical maturity roughly equivalent

34

Challenges and Complexity of Aerodynamic Wing  

E-Print Network [OSTI]

Chapter 1 Challenges and Complexity of Aerodynamic Wing Design Kasidit Leoviriyakit and Antony@stanford.edu and jameson@baboon.stanford.edu This paper focuses on aerodynamic design methodology. It discusses challenges and complexity of aerodynamic wing design for a transonic aircraft, which arise from the complex nature of flow

Jameson, Antony

35

Airfoil Optimization Using Practical Aerodynamic Design Requirements  

E-Print Network [OSTI]

Airfoil Optimization Using Practical Aerodynamic Design Requirements Howard P. Buckley, Beckett Y., Toronto, Ontario, M3H 5T6, Canada Practical aerodynamic design problems must balance the goal the aerodynamic constraints imposed at the off-design operating conditions to be treated explicitly. Both methods

Zingg, David W.

36

Aerodynamics and Aeroelastics, WP 2 Flemming Rasmussen  

E-Print Network [OSTI]

Aerodynamics and Aeroelastics, WP 2 Flemming Rasmussen Aeroelastic Design Wind Energy Department Risø DTU #12;WP2 Aero-dynamics and Aero-elastics OBJECTIVES 1. Development of nonlinear structural dynamic models (modeling on the micromechanical scale is input from WP3). 2. Advanced aerodynamic models

37

On Aerodynamic Design Through Multipoint Numerical Optimization  

E-Print Network [OSTI]

On Aerodynamic Design Through Multipoint Numerical Optimization Howard P. Buckley, and David WT6, Canada A multipoint optimization approach is used to solve aerodynamic design problems en integral as an objective function is demonstrated to improve aerodynamic performance over a range of on

Zingg, David W.

38

CFD-based Optimization for Automotive Aerodynamics  

E-Print Network [OSTI]

Chapter 1 CFD-based Optimization for Automotive Aerodynamics Laurent Dumas Abstract The car drag- ments. An overview of the main characteristics of automotive aerodynamics and a detailed presentation.dumas@upmc.fr) 1 #12;2 Laurent Dumas 1.1 Introducing Automotive Aerodynamics 1.1.1 A Major Concern for Car

Dumas, Laurent

39

Comparing Aerodynamic Models for Numerical Simulation of  

E-Print Network [OSTI]

Comparing Aerodynamic Models for Numerical Simulation of Dynamics and Control of Aircraft and simulation of aircraft, yet other aerodynamics models exist that can provide more accurate results for certain simulations without a large increase in computational time. In this paper, sev- eral aerodynamics

Peraire, Jaime

40

AIAA 99--1467 LOW ORDER AERODYNAMIC  

E-Print Network [OSTI]

AIAA 99--1467 LOW ORDER AERODYNAMIC MODELS FOR AEROELASTIC CONTROL OF TURBOMACHINES K.E. Willcox, J of Aeronautics and Astronautics 1801 Alexander Bell Drive, Suite 500, Reston, VA 22091 #12; LOW ORDER AERODYNAMIC order aerodynamic model is developed for aeroelastic analysis of turbomachines. The proper or­ thogonal

Peraire, Jaime

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Toward Practical Aerodynamic Design Through Numerical Optimization  

E-Print Network [OSTI]

Toward Practical Aerodynamic Design Through Numerical Optimization David W. Zingg, and Laura6, Canada A Newton-Krylov algorithm for aerodynamic optimization is applied to the multipoint design aerodynamic design. I. Introduction Beginning with the work of Hicks et al.1 and Hicks and Henne,2 numerical

Zingg, David W.

42

ME421. Foundations of Aerodynamics. Victor Yakhot  

E-Print Network [OSTI]

ME421. Foundations of Aerodynamics. Victor Yakhot Syllabus. Spring 2014 . 1/16, 21. Fluids;Books. 1. D. Wilcox, "Basic Fluid Mechanics". 2. J. Anderson, Fundamentals of aerodynamics. 3. V.Yakhot,, ME421. Fluid Mechanics and aerodynamics. My lecture notes. 4. I. Abbott and A. Doenhoff, Theory

Lin, Xi

43

ME421. Foundations of Aerodynamics. Victor Yakhot  

E-Print Network [OSTI]

ME421. Foundations of Aerodynamics. Victor Yakhot Syllabus. Spring 2013 . 1/17, 22. Fluids Mechanics". 2. J. Anderson, Fundamentals of aerodynamics. 3. V.Yakhot,, ME421. Fluid Mechanics and aerodynamics. My lecture notes. 4. I. Abbott and A. Doenhoff, Theory of wing sections, Dover Publications, NY

44

Conformal Mapping in Wing Aerodynamics Thomas Johnson  

E-Print Network [OSTI]

Conformal Mapping in Wing Aerodynamics Thomas Johnson June 4, 2013 Contents 1 Introduction 1 2 the first complete treatment of conformal mapping in aerodynamics. Near the beginning of the twentieth and aerodynamics. The purpose of this exposition is to give the reader an elementary intro- duction to the use

Morrow, James A.

45

CFD analysis of laminar oscillating flows  

SciTech Connect (OSTI)

This paper describes a numerical simulations of oscillating flow in a constricted duct and compares the results with experimental and theoretical data. The numerical simulations were performed using the computational fluid dynamics (CFD) code CFX4.2. The numerical model simulates an experimental oscillating flow facility that was designed to test the properties and characteristics of oscillating flow in tapered ducts, also known as jet pumps. Jet pumps are useful devices in thermoacoustic machinery because they produce a secondary pressure that can counteract an unwanted effect called streaming, and significantly enhance engine efficiency. The simulations revealed that CFX could accurately model velocity, shear stress and pressure variations in laminar oscillating flow. The numerical results were compared to experimental data and theoretical predictions with varying success. The least accurate numerical results were obtained when laminar flow approached transition to turbulent flow.

Booten, C. W. Charles W.); Konecni, S. (Snezana); Smith, B. L. (Barton L.); Martin, R. A. (Richard A.)

2001-01-01T23:59:59.000Z

46

AIAA 20030185 Aerodynamically Controlled Expansion  

E-Print Network [OSTI]

undesirable over-expansion in generalized supersonic nozzle flows. Nomenclature A cross-sectional area fgAIAA 20030185 Aerodynamically Controlled Expansion Nozzle for STOVL Aircraft D.A. Terrier Lockheed Controlled Expansion Nozzle for STOVL Aircraft Douglas A. Terrier* Lockheed Martin Aeronautics Company, Fort

Texas at Arlington, University of

47

Iron/soot interaction in a laminar ethylene nonpremixed flame  

SciTech Connect (OSTI)

A laminar, coannular, ethylene/air nonpremixed flame doped with ferrocene additive is employed to address the fundamental question of how iron becomes incorporated into the carbonaceous soot phase, thus interfering with the soot formation processes. The structure and chemical composition of individual aggregates are characterized with respect to flame coordinates via a combination of thermophoretic sampling, transmission electron microscopy, and energy dispersive spectrometry. Soot aggregate microstructure clearly reveals iron occlusion, as well as stratification of soot layers over the occluded phase. The study provides physical evidence that the soot and iron compounds combine in the flame to form a hybrid (inhomogeneous) particulate phase. The reported observations are consistent with the hypothesis that ferrocene decomposes early in the combustion process and before the onset of soot particle inception, thus forming a fine aerosol for the subsequent deposition of carbonaceous substances. Examination of a series of inhomogeneous soot aggregates shows that the flame aerosol composition varies with flame coordinates. In particular, aggregates transported in the soot annulus near the luminous flame front are primarily composed of carbon and oxygen, with traces of iron finely dispersed through the aggregate matrix. On the other hand, carbonaceous soot transported at low heights and near the flame axis contains iron in its elemental form. Finally, soot aggregates in all other areas of the flame contain both iron and oxygen, thus implying the possible presence of iron oxides within the carbonaceous matrix.

Zhang, J.; Megaridis, C.M. [Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering

1994-12-31T23:59:59.000Z

48

Joint computational and experimental aerodynamics research on a reentry vehicle  

SciTech Connect (OSTI)

This paper seeks to improve the synergism between computational aerodynamics and wind tunnel experimentation. In this paper, experimental and computational results are presented for a hypersonic vehicle configuration at Mach 8. Comparisons are made between experimental and computational results in order to improve the accuracy of both approaches. The basic vehicle configuration is a spherically blunted cone with a slice parallel with the axis of the vehicle. The half-angle of the cone is 10 deg. and the ratio of spherical nose radius to base radius in 10%. Onto the slice portion of the vehicle can be attached flaps with three different deflection angles; 10, 20, and 30 deg. All of the experimental results were obtained in the Sandia Mach 8 long duration, blow-down, hypersonic wind tunnel. Flow visualization results include surface oil flow, spark schlieren, and liquid crystal photographs and video. The liquid crystals were used as an aid in verifying that a laminar boundary layer existed over the entire body. An extensive uncertainty analysis was conducted to estimate quantitatively the accuracy of the measurement. Computational aerodynamic force and moment predictions are compared with the wind tunnel data. The Sandia Parabolized Navier-Stokes code is used to generate solutions for the sliced vehicle (no flap) and partial solutions for the flapped vehicle. For the geometry with the flap, an axially separated flow occurs and a time iterative Navier-Stokes code is used to provide comparisons with the data. This paper presents a portion of the results given in earlier works and also discusses new experimental results with this configuration.

Not Available

1991-01-01T23:59:59.000Z

49

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS  

E-Print Network [OSTI]

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS PART III: CYCLOPENTENE-length article SHORTENED RUNNING TITLE : METHANE FLAMES DOPED BY CYCLOPENTENE * E-mail : pierre with the studies presented in the parts I and II of this paper, the structure of a laminar rich premixed methane

Paris-Sud XI, Université de

50

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS  

E-Print Network [OSTI]

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS PART II: 1,3-BUTADIENE-length article SHORTENED RUNNING TITLE : METHANE FLAMES DOPED BY 1,3-BUTADIENE * E-mail : Pierre of this paper, the structure of a laminar rich premixed methane flame doped with 1,3-butadiene has been

Paris-Sud XI, Université de

51

THE AERODYNAMICS OF THE BRITISH LATE TRIASSIC KUEHNEOSAURIDAE  

E-Print Network [OSTI]

THE AERODYNAMICS OF THE BRITISH LATE TRIASSIC KUEHNEOSAURIDAE by KOEN STEIN* , COLIN PALMER been limited. Here, we provide a thorough aerodynamic analysis of both genera of British kuehneosaur words: Kuehneosauridae, Diapsida, Late Triassic, glid- ing, aerodynamics. The Kuehneosauridae

Benton, Michael

52

Aerodynamic Forces on Truck Models, Including Two Trucks in Tandem  

E-Print Network [OSTI]

rear-edge shaping on the aerodynamic drag of bluff vehiclesOF CALIFORNIA, BERKELEY Aerodynamic Forces on Truck Models,TRANSIT AND HIGHWAYS Aerodynamic Forces on Truck Models,

Hammache, Mustapha; Michaelian, Mark; Browand, Fred

2001-01-01T23:59:59.000Z

53

Rarefaction Effects in Hypersonic Aerodynamics Vladimir V. Riabov  

E-Print Network [OSTI]

Rarefaction Effects in Hypersonic Aerodynamics Vladimir V. Riabov Department of Mathematics, and others) in aerodynamics of the probes is studied. Important kinetic effects that are specific. Keywords: DSMC method, aerodynamic coefficients, hypersonic flows, similarity parameters, torus, spinning

Riabov, Vladimir V.

54

The Aerodynamics of Deforming Wings at Low Reynolds Number  

E-Print Network [OSTI]

of advance ratio on the aerodynamics of revolving wings. J.and M. H. Dickinson. The aerodynamics of hovering flight inand Industrial Aerodynamics, 96:20932103, 2008. [56] D. Kim

Medina, Albert

2013-01-01T23:59:59.000Z

55

Evaporation of Water from Particles in the Aerodynamic Lens Inlet...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Water from Particles in the Aerodynamic Lens Inlet: An Experimental Study. Evaporation of Water from Particles in the Aerodynamic Lens Inlet: An Experimental Study. Abstract:...

56

aerodynamic features vehicle body components: Topics by E-print...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

is a considerable body of information available Kreinovich, Vladik 2 Aerodynamic optimization of a solar powered race vehicle MIT - DSpace Summary: Aerodynamic optimization was...

57

Aerodynamic Drag and Gyroscopic Stability  

E-Print Network [OSTI]

This paper describes the effects on aerodynamic drag of rifle bullets as the gyroscopic stability is lowered from 1.3 to 1.0. It is well known that a bullet can tumble for stability less than 1.0. The Sierra Loading Manuals (4th and 5th Editions) have previously reported that ballistic coefficient decreases significantly as gyroscopic stability, Sg, is lowered below 1.3. These observations are further confirmed by the experiments reported here. Measured ballistic coefficients were compared with gyroscopic stabilities computed using the Miller Twist Rule for nearly solid metal bullets with uniform density and computed using the Courtney-Miller formula for plastic-tipped bullets. The experiments reported here also demonstrate a decrease in aerodynamic drag near Sg = 1.23 +/- 0.02. It is hypothesized that this decrease in drag over a narrow band of Sg values is due to a rapid damping of coning motions (precession and nutation). Observation of this drag decrease at a consistent value of Sg demonstrates the relati...

Courtney, Elya R

2013-01-01T23:59:59.000Z

58

Inductively coupled plasma torch with laminar flow cooling  

DOE Patents [OSTI]

An improved inductively coupled gas plasma torch. The torch includes inner and outer quartz sleeves and tubular insert snugly fitted between the sleeves. The insert includes outwardly opening longitudinal channels. Gas flowing through the channels of the insert emerges in a laminar flow along the inside surface of the outer sleeve, in the zone of plasma heating. The laminar flow cools the outer sleeve and enables the torch to operate at lower electrical power and gas consumption levels additionally, the laminar flow reduces noise levels in spectroscopic measurements of the gaseous plasma.

Rayson, Gary D. (Las Cruces, NM); Shen, Yang (Las Cruces, NM)

1991-04-30T23:59:59.000Z

59

The effects of surface instabilities on laminar film condensation  

E-Print Network [OSTI]

Heat transfer rates for laminar film condensation of Freon-1l3 were measured on the underside of horizontal surfaces, inclined surfaces, and vertical surfaces. Several distinct regimes of flow were observed. On the underside ...

Gerstmann, Joseph

1965-01-01T23:59:59.000Z

60

Aeroelastic Analysis of Bridges: Effects of Turbulence and Aerodynamic Nonlinearities  

E-Print Network [OSTI]

Aeroelastic Analysis of Bridges: Effects of Turbulence and Aerodynamic Nonlinearities Xinzhong Chen for capturing the emerging concerns in bridge aerodynamics introduced by aerodynamic nonlinearities/or with aerodynamic characteristics sensitive to the effective angle of incidence. This paper presents a nonlinear

Kareem, Ahsan

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

MULTITARGET ERROR ESTIMATION AND ADAPTIVITY IN AERODYNAMIC FLOW SIMULATIONS  

E-Print Network [OSTI]

MULTI­TARGET ERROR ESTIMATION AND ADAPTIVITY IN AERODYNAMIC FLOW SIMULATIONS RALF HARTMANN # Abstract. Important quantities in aerodynamic flow simulations are the aerodynamic force coe subject classifications. 65N12,65N15,65N30 1. Introduction. In aerodynamic computations like compressible

Hartmann, Ralf

62

MULTITARGET ERROR ESTIMATION AND ADAPTIVITY IN AERODYNAMIC FLOW SIMULATIONS  

E-Print Network [OSTI]

MULTITARGET ERROR ESTIMATION AND ADAPTIVITY IN AERODYNAMIC FLOW SIMULATIONS RALF HARTMANN Abstract. Important quantities in aerodynamic flow simulations are the aerodynamic force coefficients including Navier-Stokes equations AMS subject classifications. 65N12,65N15,65N30 1. Introduction. In aerodynamic

Hartmann, Ralf

63

The External Aerodynamics of Canine Olfaction Gary S. Settles*  

E-Print Network [OSTI]

The External Aerodynamics of Canine Olfaction Gary S. Settles* , Douglas A. Kester** , Lori J Literature on the External Aerodynamics of Olfaction B. Precedent Literature on Aerodynamic Sampling Technology III. Canine Olfaction Experiments IV. The Design of an Aerodynamic Sniffer A. Background B

Settles, Gary S.

64

16.100 Aerodynamics, Fall 2002  

E-Print Network [OSTI]

This course extends fluid mechanic concepts from Unified Engineering to the aerodynamic performance of wings and bodies in sub/supersonic regimes. 16.100 generally has four components: subsonic potential flows, including ...

Darmofal, David L.

65

The aerodynamics of the beautiful game  

E-Print Network [OSTI]

We consider the aerodynamics of football, specifically, the interaction between a ball in flight and the ambient air. Doing so allows one to account for the characteristic range and trajectories of balls in flight, as well ...

Bush, John W. M.

2013-01-01T23:59:59.000Z

66

Anisotropic Grid Adaptation for Multiple Aerodynamic Outputs  

E-Print Network [OSTI]

Anisotropic gridadaptive strategies are presented for viscous flow simulations in which the accurate prediction of multiple aerodynamic outputs (such as the lift, drag, and moment coefficients) is required from a single ...

Venditti, David A.

67

Inequality design limits in optimal aerodynamic shapes  

E-Print Network [OSTI]

INEQUALITY DESIGN LIMITS IN OPTIMAL AERODYNAMIC SHAPES A Thesis By CHARLES KNIGHT SEAMAN Submitted to the Graduate College of the Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May 1968... Major Subject: Aerospace Engineering INEQUALITY DESIGN LIMITS IN OPTIMAL AERODYNAMIC SHAPES A Thesis By CHARLES KNIGHT SEAMAN Approved as to style and content by: (Chairman of Committee) (Head of Department) (Member) (Member) May 1968...

Seaman, Charles Knight

1968-01-01T23:59:59.000Z

68

Transient Platoon Aerodynamics During Passing Maneuvers and In-line Oscillations  

E-Print Network [OSTI]

p CHAPTER TRANSIENT AERODYNAMICS DURING IN-LINE OSCILLATIONSA. J. , Road Vehicle Aerodynamics, Pentech Press, London,6] Hucho, W. - H . (ed. ), Aerodynamics of Road Vehicles,

Tsuei, J. L.; Savas, O.; Hedrick, J. K.

2000-01-01T23:59:59.000Z

69

Aerodynamic Drag and Gyroscopic Stability  

E-Print Network [OSTI]

This paper describes the effects on aerodynamic drag of rifle bullets as the gyroscopic stability is lowered from 1.3 to 1.0. It is well known that a bullet can tumble for stability less than 1.0. The Sierra Loading Manuals (4th and 5th Editions) have previously reported that ballistic coefficient decreases significantly as gyroscopic stability, Sg, is lowered below 1.3. These observations are further confirmed by experiments reported here. Measured ballistic coefficients were compared with gyroscopic stabilities computed using the Miller Twist Rule for nearly solid metal bullets with uniform density and computed using the Courtney-Miller formula for plastic-tipped bullets. The relationship between Sg and drag may be used to test the applicability of existing gyroscopic stability formulas for given bullet designs and to evaluate the accuracy of alternate formulas in cases where the existing stability formulas are not as accurate. The most definitive test of formulas predicting stability will always be observation of whether bullets tumble under given conditions. However, observations of drag changes provide valuable supplemental information because they suggest changes in stability as conditions change. Use of a continuous variable (drag) rather than a binary variable (tumbling) allows insight into stability over a range of conditions where the binary variable does not change.

Elya R. Courtney; Michael W. Courtney

2014-10-16T23:59:59.000Z

70

In vivo recording of aerodynamic force with an aerodynamic force platform  

E-Print Network [OSTI]

Flapping wings enable flying animals and biomimetic robots to generate elevated aerodynamic forces. Measurements that demonstrate this capability are based on tethered experiments with robots and animals, and indirect force calculations based on measured kinematics or airflow during free flight. Remarkably, there exists no method to measure these forces directly during free flight. Such in vivo recordings in freely behaving animals are essential to better understand the precise aerodynamic function of their flapping wings, in particular during the downstroke versus upstroke. Here we demonstrate a new aerodynamic force platform (AFP) for nonintrusive aerodynamic force measurement in freely flying animals and robots. The platform encloses the animal or object that generates fluid force with a physical control surface, which mechanically integrates the net aerodynamic force that is transferred to the earth. Using a straightforward analytical solution of the Navier-Stokes equation, we verified that the method is ...

Lentink, David; Ingersoll, Rivers

2014-01-01T23:59:59.000Z

71

CFD Investigations of a Transonic Swept-Wing Laminar Flow Control Flight Experiment  

E-Print Network [OSTI]

Laminar flow control has been studied for several decades in an effort to achieve higher efficiencies for aircraft. Successful implementation of laminar flow control technology on transport aircraft could significantly reduce drag and increase...

Neale, Tyler P.

2011-08-08T23:59:59.000Z

72

Error estimation and adaptive mesh refinement for aerodynamic flows  

E-Print Network [OSTI]

Error estimation and adaptive mesh refinement for aerodynamic flows Ralf Hartmann1 and Paul Houston2 1 Institute of Aerodynamics and Flow Technology DLR (German Aerospace Center) Lilienthalplatz 7

Hartmann, Ralf

73

AE 400-level (choose 2): AE 410 Computational Aerodynamics  

E-Print Network [OSTI]

AE 400-level (choose 2): AE 410 Computational Aerodynamics AE 412 Viscous flow & Heat Transfer AE 416 Applied Aerodynamics AE 419 Aircraft Flight Mechanics AE 433 Aerospace Propulsion AE 434 Rocket

Gilbert, Matthew

74

Five Year Plan Update Leishman 631 Helicopter Aerodynamics I X X X X  

E-Print Network [OSTI]

2017 Rotorcraft Leishman 631 Helicopter Aerodynamics I X X X X Leishman 632 Helicopter Aerodynamics II X Aerodynamics & Propulsion Sedwick 663 Intro to Plasmas for Space Prop/Powr X X Yu 665 Advanced of Aerodynamics Jones 672 Low Reynods Number Aerodynamics X X X X Cadou 674 Aerodynamics of Comp. Fluids X X

Shapiro, Benjamin

75

Comparison of the Coulter Multisizer and Aerodynamic Particle Sizer for obtaining the aerodynamic particle size of irregularly shaped dust  

E-Print Network [OSTI]

When studying air quality it is often necessary to measure the aerodynamic size distribution of particles. True aerodynamic diameter must be measured using a gravitational settling method, which is impractical. Other methods exist that use other...

McClure, Joshua Wayne

2002-01-01T23:59:59.000Z

76

FORMATION OF ROLL WAVES IN LAMINAR SHEET FLOW  

E-Print Network [OSTI]

with the wave kinematic viscosity of water distance downslope critical distance at which roll waves are formedFORMATION OF ROLL WAVES IN LAMINAR SHEET FLOW by Pierre Y. Julien and David M. Hartley January 1985 required for the formation of roll waves . . . . 5 2.3.1 Celerityofrollwaves . . . . . . . . . . . . . . 6

Julien, Pierre Y.

77

Electrostatic quadrupole focused particle accelerating assembly with laminar flow beam  

DOE Patents [OSTI]

A charged particle accelerating assembly provided with a predetermined ratio of parametric structural characteristics and with related operating voltages applied to each of its linearly spaced focusing and accelerating quadrupoles, thereby to maintain a particle beam traversing the electrostatic fields of the quadrupoles in the assembly in an essentially laminar flow through the assembly.

Maschke, A.W.

1984-04-16T23:59:59.000Z

78

Modeling of NOx formation in circular laminar jet flames  

E-Print Network [OSTI]

-premixed isolated circular laminar jet flame. The jet consists of the fuel rich inner region and the O2 rich outer region. The model estimates both thermal NOx and prompt NOx assuming single step kinetics for NOx formation and a thin flame model. Further the amount...

Siwatch, Vivek

2007-04-25T23:59:59.000Z

79

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS  

E-Print Network [OSTI]

RICH METHANE PREMIXED LAMINAR FLAMES DOPED BY LIGHT UNSATURATED HYDROCARBONS PART I: ALLENE Full-length article SHORTENED RUNNING TITLE : METHANE FLAMES DOPED BY ALLENE OR PROPYNE * E investigated: a pure methane flame and two methane flames doped by allene and propyne, respectively. The gases

Paris-Sud XI, Université de

80

Paper # A02 Topic: Laminar Flames US Combustion Meeting  

E-Print Network [OSTI]

been focused on synthetic fuel gas (syngas) combustion. Syngas is derived from coal throughPaper # A02 Topic: Laminar Flames 1 5th US Combustion Meeting Organized by the Western States Section of the Combustion Institute and Hosted by the University of California at San Diego March 25

Seitzman, Jerry M.

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Single-and Multi-Point Aerodynamic Shape Optimization  

E-Print Network [OSTI]

Single- and Multi-Point Aerodynamic Shape Optimization Using A Parallel Newton-Krylov Approach, Ontario, M3H 5T6, Canada A Newton-Krylov algorithm for aerodynamic shape optimization in three dimensions the capabilities and efficiency of the approach. I. Introduction In the aerodynamic design of aircraft, there have

Zingg, David W.

82

Strategies for Solving High-Fidelity Aerodynamic Shape Optimization Problems  

E-Print Network [OSTI]

Strategies for Solving High-Fidelity Aerodynamic Shape Optimization Problems Zhoujie Lyu Aerodynamic shape optimization based on high-fidelity models is a computational intensive endeavor. The techniques are tested using the Common Research Model wing benchmark defined by the Aerodynamic Design

Papalambros, Panos

83

Aerodynamic Shape Optimization for Aircraft Design Antony Jameson  

E-Print Network [OSTI]

Aerodynamic Shape Optimization for Aircraft Design Antony Jameson Department of Aeronautics September 6-10, 2004 c A. Jameson 2004 Stanford University, Stanford, CA 1/55 Aerodynamic Shape Optimization for Aircraft Design #12;#12; Aerodynamic Design Tradeoffs A good first estimate of performance is provided

Stanford University

84

POLE ASSIGNMENT FOR A VIBRATING SYSTEM WITH AERODYNAMIC EFFECT #  

E-Print Network [OSTI]

POLE ASSIGNMENT FOR A VIBRATING SYSTEM WITH AERODYNAMIC EFFECT # J. N. WANG + , S. H. CHOU # , Y. C­input state feedback control arising from a one­dimensional vibrating system with aerodynamic e real axis. Key words. vibrating system, aerodynamic e#ect, state feedback control, pole assignment AMS

Chou, So-Hsiang

85

Advances in Aerodynamic Shape Optimization Antony Jameson1  

E-Print Network [OSTI]

1 Advances in Aerodynamic Shape Optimization Antony Jameson1 Stanford University, Stanford, CA to aerodynamic design. This shift has been mainly motivated by the availability of high performance comput- ing by J.L. Lions [1]. The method was first used for aerodynamic design by Jameson in 1988 [2, 3]. Since

Jameson, Antony

86

Aerodynamics simulation of operating rooms N. El Gharbi*  

E-Print Network [OSTI]

Aerodynamics simulation of operating rooms N. El Gharbi* A. Benzaoui*R. Bennacer** * Faculty. Keywords: Operating room, aerodynamics simulation, turbulent model, comfort, Airflow, Indoor air quality distribution scheme. To ensure these optimal conditions, a study of the aerodynamics flow in a conditioned

Paris-Sud XI, Université de

87

Optimum Aerodynamic Design using the Navier--Stokes Equations  

E-Print Network [OSTI]

Optimum Aerodynamic Design using the Navier--Stokes Equations A. JAMESON \\Lambda ; N.A. PIERCE y factors such as aerodynamic effi­ ciency, structural weight, stability and control, and the volume the disciplines. The development of accurate and efficient methods for aerodynamic shape optimization represents

Pierce, Niles A.

88

POLE ASSIGNMENT FOR A VIBRATING SYSTEM WITH AERODYNAMIC EFFECT  

E-Print Network [OSTI]

POLE ASSIGNMENT FOR A VIBRATING SYSTEM WITH AERODYNAMIC EFFECT J. N. WANG, S. H. CHOU, Y. C. CHEN feedback control arising from a one-dimensional vibrating system with aerodynamic effect. On the practical real axis. Key words. vibrating system, aerodynamic effect, state feedback control, pole assignment AMS

Lin, Wen-Wei

89

On Aerodynamic Optimization Under a Range of Operating Conditions  

E-Print Network [OSTI]

On Aerodynamic Optimization Under a Range of Operating Conditions David W. Zingg, and Samy Elias In aerodynamic design, good performance is generally required under a range of oper- ating conditions, including aerodynamic shape optimization.1­6 The designer specifies an objective, operating conditions, constraints

Zingg, David W.

90

Unsteady aerodynamic models for agile flight at low Reynolds numbers  

E-Print Network [OSTI]

Unsteady aerodynamic models for agile flight at low Reynolds numbers Steven L. Brunton , Clarence W for the unsteady aerodynamic forces on a small wing in response to agile maneuvers and gusts. In a previous study, it was shown that Theodorsen's and Wagner's unsteady aerodynamic models agree with force data from DNS

Rowley, Clarence W.

91

An Evolutionary Geometry Parametrization for Aerodynamic Shape Optimization  

E-Print Network [OSTI]

An Evolutionary Geometry Parametrization for Aerodynamic Shape Optimization Xiaocong Han and David, M3H 5T6, Canada An evolutionary geometry parametrization is presented for aerodynamic shape optimiza, unconventional aerodynamic configurations. Based on improvements in computational fluid dynamics (CFD) and high

Zingg, David W.

92

A Pilot Project in Preparation of an Aerodynamic Optimization Workshop  

E-Print Network [OSTI]

A Pilot Project in Preparation of an Aerodynamic Optimization Workshop with Lessons Learned John C-scale Aerodynamic Optimization Workshop. Three independent optimization efforts were conducted concurrently, each in the preparation of a possible future workshop on aerodynamic shape optimization. 1.0 Introduction During AIAA

Jameson, Antony

93

Aerodynamic Force Modeling for Unsteady Wing Ryan Jantzen  

E-Print Network [OSTI]

Aerodynamic Force Modeling for Unsteady Wing Maneuvers Ryan Jantzen and Kunihiko Taira Florida, Wright-Patterson Air Force Base, OH We report on the development of an aerodynamic force model for a flat focus is placed on examining the influence of large-amplitude wing motion on the unsteady aerodynamics

94

Ris-R-1543(EN) Aerodynamic investigation of Winglets on  

E-Print Network [OSTI]

Risø-R-1543(EN) Aerodynamic investigation of Winglets on Wind Turbine Blades using CFD Jeppe Johansen and Niels N. Sørensen Title: Aerodynamic investigation of Winglets on Wind Turbine Blades using of the aerodynamics around a wind turbine blade with a winglet using Computational Fluid Dynamics, CFD. Five winglets

95

Error estimation and adaptive mesh refinement for aerodynamic flows  

E-Print Network [OSTI]

Error estimation and adaptive mesh refinement for aerodynamic flows Ralf Hartmann, Joachim Held-oriented mesh refinement for single and multiple aerodynamic force coefficients as well as residual-based mesh refinement applied to various three-dimensional lam- inar and turbulent aerodynamic test cases defined

Hartmann, Ralf

96

Managing Approximate Models in Evolutionary Aerodynamic Design Optimization  

E-Print Network [OSTI]

Managing Approximate Models in Evolutionary Aerodynamic Design Optimization Yaochu Jin yaochu jin­ mization problems that are discontinuous, multi­modal and multi­objective [1, 2]. Aerodynamic structural to high complexity of the aerodynamic analysis and large number of evaluations needed in the evolutionary

Coello, Carlos A. Coello

97

Optimizing the Aerodynamic Efficiency of IM Freight Trains  

E-Print Network [OSTI]

Optimizing the Aerodynamic Efficiency of IM Freight Trains Yung-Cheng Lai University of Illinois aerodynamic penalties and fuel consumption than general trains IM trains suffer from their equipment design and loading pattern These large gaps directly affect the aerodynamic drag of the train. This effect is greater

Barkan, Christopher P.L.

98

THE VELOCITY DEPENDENCE OF AERODYNAMIC DRAG: A PRIMER FOR MATHEMATICIANS  

E-Print Network [OSTI]

THE VELOCITY DEPENDENCE OF AERODYNAMIC DRAG: A PRIMER FOR MATHEMATICIANS LYLE N. LONG and HOWARD­entry of the space shuttle into the earth's atmosphere. Dimensional analysis is an important tool in aerodynamics­T E X 1 #12; For detailed information on the aerodynamics and fluid mechanics pertinent to this paper

99

RESEARCH ARTICLE Aerodynamic and functional consequences of wing compliance  

E-Print Network [OSTI]

RESEARCH ARTICLE Aerodynamic and functional consequences of wing compliance Andrew M. Mountcastle ?, the instantaneous shape of an insect wing is dictated by the interaction of aerodynamic forces with the inertial rever- sals--loads that well exceed the mean aerodynamic force. Although wing compliance has been

Daniel, Tom

100

Optimizing the aerodynamic efficiency of intermodal freight trains  

E-Print Network [OSTI]

Optimizing the aerodynamic efficiency of intermodal freight trains Yung-Cheng Lai a,*, Christopher form 24 April 2007; accepted 17 May 2007 Abstract We develop an aerodynamic loading assignment model fuel-efficient trains. This is the first use of optimization modeling to address the aerodynamics

Barkan, Christopher P.L.

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

COPYRIGHT 2003 by ASME AERODYNAMICS OF TIP LEAKAGE FLOWS  

E-Print Network [OSTI]

COPYRIGHT 2003 by ASME 1 AERODYNAMICS OF TIP LEAKAGE FLOWS NEAR PARTIAL SQUEALER RIMS IN AN AXIAL of aerodynamic characteristics of full and partial-length squealer rims in a turbine stage. Full and partial of these "partial squealer tips" and their chordwise position are varied to find an optimal aerodynamic tip

Camci, Cengiz

102

INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight  

E-Print Network [OSTI]

1 CHAPTER I INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight The prediction of rotor blade aerodynamic loads, especially in forward flight, requires accurate and efficient modeling of several distinct to the nonlinear interaction between the rotor aerodynamics, trim, aeroelasticity and blade dynamics. As stated

103

Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 15111528  

E-Print Network [OSTI]

Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 1511­1528 New frontiers in aerodynamic tailoring of long span bridges: an advanced analysis framework Xinzhong Chen*, Ahsan Kareem Nat analysis have been made utilizing realistic aerodynamic force modeling for bridges with bluff sections

Chen, Xinzhong

104

Ris-PhD-Report Wind Turbines: Unsteady Aerodynamics and  

E-Print Network [OSTI]

Risø-PhD-Report Wind Turbines: Unsteady Aerodynamics and Inflow Noise Brian Riget Broe Risø-PhD-47 Title: Wind Turbines: Unsteady Aerodynamics and Inflow Noise Division: Wind Energy Division Risø-PhD-47(EN) December 2009 Abstract (max. 2000 char.): Aerodynamical noise from wind turbines due

105

Robust Multi-Objective Optimization in Aerodynamics using MGDA  

E-Print Network [OSTI]

Robust Multi-Objective Optimization in Aerodynamics using MGDA Daigo Maruyama N° 8428-00919215,version1-16Dec2013 #12;Robust Multi-Objective Optimization in Aerodynamics using MGDA Daigo: This study deals with robust design optimization strategies in aerodynamics

Boyer, Edmond

106

AIAA Paper 2001-0870 Re-engineering Aerodynamics Education  

E-Print Network [OSTI]

AIAA Paper 2001-0870 Re-engineering Aerodynamics Education David Darmofal, Earll Murman Aeronautics Paper 2001-0870 Re-engineering Aerodynamics Education David Darmofal* , Earll Murman Massachusetts Institute of Technology Michael Love Lockheed Martin Aeronautics Company Abstract Aerodynamics curriculum

Peraire, Jaime

107

A Genetic Algorithm for Multiobjective Design Optimization in Aerodynamics and  

E-Print Network [OSTI]

A Genetic Algorithm for Multiobjective Design Optimization in Aerodynamics and Electromagnetics R. The objective functions in the optimization problem measure the aerodynamic feasibil­ ity based on the drag been optimized with respect to only one discipline such as aerodynamics or electromagnetics. Although

Coello, Carlos A. Coello

108

Fifty Years of Aerodynamics: Successes, Challenges, and Opportunities  

E-Print Network [OSTI]

Fifty Years of Aerodynamics: Successes, Challenges, and Opportunities T.E. Nelson * D.W. Zingg, Canada. E-mail: tnelson@dehavilland.ca ** Senior Canada Research Chair in Computational Aerodynamics-mail: dwz@oddjob.utias.utoronto.ca Received 22 January 2004. PART I: AIRCRAFT DEVELOPMENT, AERODYNAMIC

Zingg, David W.

109

Aerodynamic beam generator for large particles  

DOE Patents [OSTI]

A new type of aerodynamic particle beam generator is disclosed. This generator produces a tightly focused beam of large material particles at velocities ranging from a few feet per second to supersonic speeds, depending on the exact configuration and operating conditions. Such generators are of particular interest for use in additive fabrication techniques.

Brockmann, John E. (Albuquerque, NM); Torczynski, John R. (Albuquerque, NM); Dykhuizen, Ronald C. (Albuquerque, NM); Neiser, Richard A. (Albuquerque, NM); Smith, Mark F. (Albuquerque, NM)

2002-01-01T23:59:59.000Z

110

Anisotropic Grid Adaptation for Multiple Aerodynamic Outputs  

E-Print Network [OSTI]

Anisotropic Grid Adaptation for Multiple Aerodynamic Outputs David A. Venditti and David L Anisotropic gridadaptive strategies are presented for viscous flow simulations in which the accurate estimation and Hessian-based anisotropic grid adaptation. Airfoil test cases are presented to demonstrate

Peraire, Jaime

111

Gyrotactic trapping in laminar and turbulent Kolmogorov flow  

E-Print Network [OSTI]

Phytoplankton patchiness, namely the heterogeneous distribution of microalgae over multiple spatial scales, dramatically impacts marine ecology. A spectacular example of such heterogeneity occurs in thin phytoplankton layers (TPLs), where large numbers of photosynthetic microorganisms are found within a small depth interval. Some species of motile phytoplankton can form TPLs by gyrotactic trapping due to the interplay of their particular swimming style (directed motion biased against gravity) and the transport by a flow with shear along the direction of gravity. Here we consider gyrotactic swimmers in numerical simulations of the Kolmogorov shear flow, both in laminar and turbulent regimes. In the laminar case, we show that the swimmer motion is integrable and the formation of TPLs can be fully characterized by means of dynamical systems tools. We then study the effects of rotational Brownian motion or turbulent fluctuations (appearing when the Reynolds number is large enough) on TPLs. In both cases we show that TPLs become transient, and we characterize their persistence.

Francesco Santamaria; Filippo De Lillo; Massimo Cencini; Guido Boffetta

2014-10-07T23:59:59.000Z

112

Type I planet migration in nearly laminar disks  

SciTech Connect (OSTI)

We describe two-dimensional hydrodynamic simulations of the migration of low-mass planets ({<=}30 M{sub {circle_plus}}) in nearly laminar disks (viscosity parameter {alpha} < 10{sup -3}) over timescales of several thousand orbit periods. We consider disk masses of 1, 2, and 5 times the minimum mass solar nebula, disk thickness parameters of H/r = 0.035 and 0.05, and a variety of {alpha} values and planet masses. Disk self-gravity is fully included. Previous analytic work has suggested that Type I planet migration can be halted in disks of sufficiently low turbulent viscosity, for {alpha} {approx} 10{sup -4}. The halting is due to a feedback effect of breaking density waves that results in a slight mass redistribution and consequently an increased outward torque contribution. The simulations confirm the existence of a critical mass (M{sub {alpha}} {approx} 10M{sub {circle_plus}}) beyond which migration halts in nearly laminar disks. For {alpha} {approx}> 10{sup -3}, density feedback effects are washed out and Type I migration persists. The critical masses are in good agreement with the analytic model of Rafikov. In addition, for {alpha} {approx}> 10{sup -4} steep density gradients produce a vortex instability, resulting in a small time-varying eccentricity in the planet's orbit and a slight outward migration. Migration in nearly laminar disks may be sufficiently slow to reconcile the timescales of migration theory with those of giant planet formation in the core accretion model.

Li, Hui [Los Alamos National Laboratory; Li, Shengtai [Los Alamos National Laboratory; Lubow, S H [STSI; Lin, D [UCSC

2008-01-01T23:59:59.000Z

113

Device for reducing vehicle aerodynamic resistance  

DOE Patents [OSTI]

A device for reducing vehicle aerodynamic resistance for vehicles having a generally rectangular flat front face comprising a plurality of load bearing struts of a predetermined size attached to the flat front face adjacent the sides and top thereof, a pair of pliable opposing flat sheets having an outside edge portion attached to the flat front face adjacent the sides thereof and an upper edge with a predetermined curve; the opposing flat sheets being bent and attached to the struts to form effective curved airfoil shapes, and a top pliable flat sheet disposed adjacent the top of the flat front face and having predetermined curved side edges, which, when the top sheet is bent and attached to the struts to form an effective curved airfoil shape, mate with the curved upper edges of the opposing sheets to complete the aerodynamic device.

Graham, Sean C.

2006-03-07T23:59:59.000Z

114

Aerodynamic interference between two Darrieus wind turbines  

SciTech Connect (OSTI)

The effect of aerodynamic interference on the performance of two curved bladed Darrieus-type vertical axis wind turbines has been calculated using a vortex/lifting line aerodynamic model. The turbines have a tower-to-tower separation distance of 1.5 turbine diameters, with the line of turbine centers varying with respect to the ambient wind direction. The effects of freestream turbulence were neglected. For the cases examined, the calculations showed that the downwind turbine power decrement (1) was significant only when the line of turbine centers was coincident with the ambient wind direction, (2) increased with increasing tipspeed ratio, and (3) is due more to induced flow angularities downstream than to speed deficits near the downstream turbine.

Schatzle, P.R.; Klimas, P.C.; Spahr, H.R.

1981-04-01T23:59:59.000Z

115

Device for reducing vehicle aerodynamic resistance  

DOE Patents [OSTI]

A device for reducing vehicle aerodynamic resistance for vehicles having a generally rectangular body disposed above rear wheels, comprising a plurality of load bearing struts attached to the bottom of the rectangular body adjacent its sides, a plurality of opposing flat sheets attached to the load bearing struts, and angled flaps attached to the lower edge of the opposing sheets defining an obtuse angle with the opposing flat sheets extending inwardly with respect to the sides of the rectangular body to a predetermined height above the ground, which, stiffen the opposing flat sheets, bend to resist damage when struck by the ground, and guide airflow around the rear wheels of the vehicle to reduce its aerodynamic resistance when moving.

Graham, Sean C.

2006-08-22T23:59:59.000Z

116

Device for reducing vehicle aerodynamic resistance  

DOE Patents [OSTI]

A device for a vehicle with a pair of swinging rear doors, which converts flat sheets of pliable material hinged to the sides of the vehicle adjacent the rear thereof into effective curved airfoils that reduce the aerodynamic resistance of the vehicle, when the doors are closed by hand, utilizing a plurality of stiffeners disposed generally parallel to the doors and affixed to the sheets and a plurality of collapsible tension bearings struts attached to each stiffener and the adjacent door.

Graham, Sean C.

2005-02-15T23:59:59.000Z

117

Aerodynamic characteristics of a feathered dinosaur measured using physical models. Effects of form on static stability and control effectiveness  

E-Print Network [OSTI]

McCay MG (2001) Aerodynamic stability and maneuverability ofrain forest canopy: the aerodynamic environment of gliding2011) Measurement of the aerodynamic stability and control

Evangelista, Dennis

2013-01-01T23:59:59.000Z

118

Aerodynamics of a rigid curved kite wing  

E-Print Network [OSTI]

A preliminary numerical study on the aerodynamics of a kite wing for high altitude wind power generators is proposed. Tethered kites are a key element of an innovative wind energy technology, which aims to capture energy from the wind at higher altitudes than conventional wind towers. We present the results obtained from three-dimensional finite volume numerical simulations of the steady air flow past a three-dimensional curved rectangular kite wing (aspect ratio equal to 3.2, Reynolds number equal to 3x10^6). Two angles of incidence -- a standard incidence for the flight of a tethered airfoil (6{\\deg}) and an incidence close to the stall (18{\\deg}) -- were considered. The simulations were performed by solving the Reynolds Averaged Navier-Stokes flow model using the industrial STAR-CCM+ code. The overall aerodynamic characteristics of the kite wing were determined and compared to the aerodynamic characteristics of the flat rectangular non twisted wing with an identical aspect ratio and section (Clark Y profil...

Maneia, Gianmauro; Tordella, Daniela; Iovieno, Michele

2013-01-01T23:59:59.000Z

119

aerodynamic shape design: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

MASTER OF SCIENCE May 1968... Seaman, Charles Knight 2012-06-07 2 Numerical Shape Optimization of Airfoils With Practical Aerodynamic Design Requirements. Open Access Theses and...

120

advanced aerodynamic devices: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

power line icing and wind turbine icing Hu, Hui 2 Advances in Aerodynamic Shape Optimization Antony Jameson1 Engineering Websites Summary: implicitly via a second order...

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

aerodynamic response approximation: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Page Topic Index 1 Managing Approximate Models in Evolutionary Aerodynamic Design Optimization Computer Technologies and Information Sciences Websites Summary: algorithm to a...

122

aerodynamic control preprint: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of 2 Aerodynamic design via control theory CiteSeer Summary: wing design; optimization. flow; inverse I. INTRODUCTION AND HISTORICAL SURVEY Computers have had a twofold...

123

Roles for Wnts and their receptors in topographic mapping and laminar termination  

E-Print Network [OSTI]

tectum may be assigned termination sites on a "first come,Mapping and Laminar Termination A dissertation submitted inTermination ..

Richman, Alisha

2011-01-01T23:59:59.000Z

124

E-Print Network 3.0 - atlas laminar hook Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

hook Search Powered by Explorit Topic List Advanced Search Sample search results for: atlas laminar hook Page: << < 1 2 3 4 5 > >> 1 2003 Summer Bioengineering Conference, June...

125

Transient Aerodynamic Effects on a Four-Car Platoon During Passing Maneuvers: Data Summary  

E-Print Network [OSTI]

B. Marcu, F. Browand, The Aerodynamic Forces on Misalignedof the Transient Aerodynamic Effects on a Four-Car PlatoonBERKELEY Transient Aerodynamic Effects on a Four-Car Platoon

Tsuei, L.; Hedrick, J. K.; Savas, O.

1999-01-01T23:59:59.000Z

126

Inertial and Aerodynamic Tail Steering of a Meso-scale Legged Robot  

E-Print Network [OSTI]

Legged Robots Use of Aerodynamics 2.5 Overview of previousare the use of passive aerodynamics in running robots. Fi-the first use of passive aerodynamics to induce a turn in a

Kohut, Nicholas Jospeh

2013-01-01T23:59:59.000Z

127

Aerodynamic Focusing Of High-Density Aerosols  

SciTech Connect (OSTI)

High-density micron-sized particle aerosols might form the basis for a number of applications in which a material target with a particular shape might be quickly ionized to form a cylindrical or sheet shaped plasma. A simple experimental device was built in order to study the properties of high-density aerosol focusing for 1#22; m silica spheres. Preliminary results recover previous findings on aerodynamic focusing at low densities. At higher densities, it is demonstrated that the focusing properties change in a way which is consistent with a density dependent Stokes number.

Ruiz, D. E.; Fisch, Nathaniel

2014-02-24T23:59:59.000Z

128

E-Print Network 3.0 - aerodynamics Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Airfoil Summary: Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... engineer to aerodynamic designer to lead aerodynamicist...

129

E-Print Network 3.0 - aerodynamic design features Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Airfoil Summary: Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... engineer to aerodynamic designer to lead aerodynamicist...

130

E-Print Network 3.0 - active aerodynamic control Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

aerodynamic control Search Powered by Explorit Topic List Advanced Search Sample search results for: active aerodynamic control Page: << < 1 2 3 4 5 > >> 1 MECHANICAL AND AEROSPACE...

131

E-Print Network 3.0 - aircraft aerodynamic derivatives Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

aerodynamic derivatives Search Powered by Explorit Topic List Advanced Search Sample search results for: aircraft aerodynamic derivatives Page: << < 1 2 3 4 5 > >> 1 Morphing...

132

E-Print Network 3.0 - analytical aerodynamic model Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

aerodynamic model Search Powered by Explorit Topic List Advanced Search Sample search results for: analytical aerodynamic model Page: << < 1 2 3 4 5 > >> 1 LABORATOIRE D'INGNIERIE...

133

E-Print Network 3.0 - aerodynamic space -to Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Aerodynamics... Measurements of Air Quality Gas Dynamics High-Speed Aerodynamics and Heat Transfer Kinetic Theory-Based ... Source: Texas A&M University, Texas Transportation...

134

E-Print Network 3.0 - aerodynamic stability Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of the aerodynamic resistance S. Liu, D. Mao, and L. Lu State key Laboratory of Remote Sensing Science, School... -705, 2006 Measurement and estimation of the aerodynamic...

135

E-Print Network 3.0 - aiaa aerodynamic measurement Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Aerospace and Ocean Engineering, Virginia Tech Collection: Engineering 24 Airfoil Ice-Accretion Aerodynamics Simulation and A. Broeren Summary: is required for aerodynamic...

136

E-Print Network 3.0 - aerodynamic measurement technology Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Technology, 2434 BRISBANE QLD 4001 AUSTRALIA Abstract In order to reduce aerodynamic... -17 December 2004 Identification of aerodynamic sound source in the wake of a rotating...

137

Wind Turbine Blade Flow Fields and Prospects for Active Aerodynamic Control: Preprint  

SciTech Connect (OSTI)

This paper describes wind turbine flow fields that can cause adverse aerodynamic loading and can impact active aerodynamic control methodologies currently contemplated for wind turbine applications.

Schreck, S.; Robinson, M.

2007-08-01T23:59:59.000Z

138

E-Print Network 3.0 - aerodynamic side loads Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

University Collection: Engineering 5 Aerodynamic Shape Optimization of a Freight Train Subjected to a 30 Side Wind with CFD Summary: Aerodynamic Shape Optimization of a...

139

aerodynamic design optimization: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

aerodynamic design optimization First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Aerodynamic design...

140

aerodynamic shape optimization: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

aerodynamic shape optimization First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 AIAA 982538 Aerodynamic...

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Distinct large-scale turbulent-laminar states in transitional pipe flow  

E-Print Network [OSTI]

Distinct large-scale turbulent-laminar states in transitional pipe flow David Moxey1 and Dwight) When fluid flows through a channel, pipe, or duct, there are two basic forms of motion: smooth laminar numerical computations in pipes of variable lengths up to 125 diameters to investigate the nature of transi

Barkley, Dwight

142

EulerianEulerian two-phase numerical simulation of nanofluid laminar forced convection in a microchannel  

E-Print Network [OSTI]

by a cooling system to guarantee their appropriate performance. One possible way to cool these devises canEulerian­Eulerian two-phase numerical simulation of nanofluid laminar forced convection August 2010 Accepted 5 August 2010 Keywords: Nanofluid Microchannel Two-phase Laminar Heat transfer a b

Harting, Jens

143

Electrochimica Acta 50 (2005) 53905398 Membraneless laminar flow-based micro fuel cells operating in alkaline,  

E-Print Network [OSTI]

Electrochimica Acta 50 (2005) 5390­5398 Membraneless laminar flow-based micro fuel cells operating) in membraneless, laminar flow-based micro fuel cells (LF-FCs) eliminates several PEM-related issues such as fuel the anode is in acidic media while the cathode is in alkali, or vice versa. Operating a fuel cell under

Kenis, Paul J. A.

144

Laminar-turbulent separatrix in a boundary layer flow  

E-Print Network [OSTI]

The transitional boundary layer flow over a flat plate is investigated. The boundary layer flow is known to develop unstable Tollmien-Schlichting waves above a critical value of the Reynolds number. However, it is also known that this transition can be observed for sub-critical Reynolds numbers. In that case, the basin of attraction of the laminar state coexists with the sustained turbulence. In this article, the trajectory on the separatrix between these two states is simulated. The state on the separatrix is independent from the initial condition and is dynamically connected to both the laminar flow and the turbulence. Such an edge state provides information regarding the basic features of the transitional flow. The solution takes the form of a low speed streak, flanked by two quasi-streamwise sinuous vortices. The shape of the streaks is close to that simulated with the linear optimal perturbation method. This solution is compared to existing results concerning streak breakdown. The simulations are realize...

Biau, Damien

2013-01-01T23:59:59.000Z

145

Formation of Liquid Methane-Water Mixture during Combustion of a Laminar Methane Jet at Supercritical Pressures  

E-Print Network [OSTI]

Formation of Liquid Methane-Water Mixture during Combustion of a Laminar Methane Jet in laminar jet flames of methane at elevated pressures in a high-pressure combustion chamber, we have MPa, after the laminar methane jet flame had been stabilized on a co-flow circular nozzle-type burner

Gülder, ?mer L.

146

Methods of reducing vehicle aerodynamic drag  

SciTech Connect (OSTI)

A small scale model (length 1710 mm) of General Motor SUV was built and tested in the wind tunnel for expected wind conditions and road clearance. Two passive devices, rear screen which is plate behind the car and rear fairing where the end of the car is aerodynamically extended, were incorporated in the model and tested in the wind tunnel for different wind conditions. The conclusion is that rear screen could reduce drag up to 6.5% and rear fairing can reduce the drag by 26%. There were additional tests for front edging and rear vortex generators. The results for drag reduction were mixed. It should be noted that there are aesthetic and practical considerations that may allow only partial implementation of these or any drag reduction options.

Sirenko V.; Rohatgi U.

2012-07-08T23:59:59.000Z

147

E-Print Network 3.0 - aerodynamic drag presentation Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

presentation Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic drag presentation...

148

Aerodynamic-Structural Design Studies of Low-Sweep Transonic Wings  

E-Print Network [OSTI]

Aerodynamic-Structural Design Studies of Low-Sweep Transonic Wings Antony Jameson Department level. High-fidelity aerodynamic and aerodynamic-structural optimizations are performed on a set to significantly reduce wing sweep without incurring either aerodynamic or structural penalties, especially for M

Jameson, Antony

149

E-Print Network 3.0 - aerodynamic drag presentations Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

presentations Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic drag presentations...

150

Modeling FullEnvelope Aerodynamics of Small UAVs in RealTime Prof. Michael Selig  

E-Print Network [OSTI]

D M E S S Modeling FullEnvelope Aerodynamics of Small UAVs in RealTime Prof. Michael Selig Applied Aerodynamics Group and Subsonic Aerodynamics Research Lab Department of Aerospace Engineering will focus on the development of a full six degreeoffreedom aerodynamics modeling environment for small UAVs

Barthelat, Francois

151

Hypersonic Arbitrary-Body Aerodynamics (HABA) for conceptual design  

SciTech Connect (OSTI)

The Hypersonic Arbitrary-Body Aerodynamics (HABA) computer program predicts static and dynamic aerodynamic derivatives at hypersonic speeds for any vehicle geometry. It is intended to be used during conceptual design studies where fast computational speed is required. It uses the same geometry and hypersonic aerodynamic methods as the Mark IV Supersonic/Hypersonic Arbitrary-Body Program (SHABP) developed under sponsorship of the Air Force Flight Dynamics Laboratory; however, the input and output formats have been improved to make it easier to use. This program is available as part of the Department 9140 CAE software.

Salguero, D.E.

1990-03-15T23:59:59.000Z

152

Aerodynamic performance measurements in a counter-rotating aspirated compressor  

E-Print Network [OSTI]

This thesis is an experimental investigation of the aerodynamic performances of a counter-rotating aspirated compressor. This compressor is implemented in a blow-down facility, which gives rigorous simulation of the ...

Onne, Jean-Franois

2005-01-01T23:59:59.000Z

153

American Institute of Aeronautics and Astronautics AERODYNAMIC OPTIMIZATION FOR FREIGHT  

E-Print Network [OSTI]

American Institute of Aeronautics and Astronautics 1 AERODYNAMIC OPTIMIZATION FOR FREIGHT TRUCKS and Astronautics 2 controls,4 , flight trajectories,5 wings and airfoils,6,7,9,10 inlets,14 rockets,16,19 missiles

Roy, Chris

154

Structural and Aerodynamic Interaction Computational Tool for Highly Reconfigurable Wings  

E-Print Network [OSTI]

of the aerospace industry, and a reconfigurable wing is a significant element of a morphing aircraft. This thesis develops two tools for analyzing wing configurations with multiple geometric degrees-of-freedom: the structural tool and the aerodynamic and structural...

Eisenbeis, Brian Joseph

2011-10-21T23:59:59.000Z

155

Aerodynamic optimization of a solar powered race vehicle  

E-Print Network [OSTI]

Aerodynamic optimization was performed on Tesseract, the MIT Solar Electric Vehicle Team's 2003-2005 solar car using Wind Tunnel 8 at Jacobs/Sverdrup Drivability Test Facility in Allen Park, MI. These tests include angle ...

Augenbergs, Peteris K

2006-01-01T23:59:59.000Z

156

Reduced-order aerodynamic models for aeroelastic control of turbomachines  

E-Print Network [OSTI]

Aeroelasticity is a critical consideration in the design of gas turbine engines, both for stability and forced response. Current aeroelastic models cannot provide high-fidelity aerodynamics in a form suitable for design ...

Willcox, Karen Elizabeth

157

Applications of Proper Orthogonal Decomposition for Inviscid Transonic Aerodynamics  

E-Print Network [OSTI]

Two extensions to the proper orthogonal decomposition (POD) technique are considered for steady transonic aerodynamic applications. The first is to couple the POD approach with a cubic spline interpolation procedure in ...

Tan, Bui-Thanh

158

DOE Project on Heavy Vehicle Aerodynamic Drag  

SciTech Connect (OSTI)

Class 8 tractor-trailers consume 11-12% of the total US petroleum use. At highway speeds, 65% of the energy expenditure for a Class 8 truck is in overcoming aerodynamic drag. The project objective is to improve fuel economy of Class 8 tractor-trailers by providing guidance on methods of reducing drag by at least 25%. A 25% reduction in drag would present a 12% improvement in fuel economy at highway speeds, equivalent to about 130 midsize tanker ships per year. Specific goals include: (1) Provide guidance to industry in the reduction of aerodynamic drag of heavy truck vehicles; (2) Develop innovative drag reducing concepts that are operationally and economically sound; and (3) Establish a database of experimental, computational, and conceptual design information, and demonstrate the potential of new drag-reduction devices. The studies described herein provide a demonstration of the applicability of the experience developed in the analysis of the standard configuration of the Generic Conventional Model. The modeling practices and procedures developed in prior efforts have been applied directly to the assessment of new configurations including a variety of geometric modifications and add-on devices. Application to the low-drag 'GTS' configuration of the GCM has confirmed that the error in predicted drag coefficients increases as the relative contribution of the base drag resulting from the vehicle wake to the total drag increases and it is recommended that more advanced turbulence modeling strategies be applied under those circumstances. Application to a commercially-developed boat tail device has confirmed that this restriction does not apply to geometries where the relative contribution of the base drag to the total drag is reduced by modifying the geometry in that region. Application to a modified GCM geometry with an open grille and radiator has confirmed that the underbody flow, while important for underhood cooling, has little impact on the drag coefficient of the vehicle. Furthermore, the evaluation of the impact of small changes in radiator or grille dimensions has revealed that the total drag is not particularly sensitive to those changes. This observation leads to two significant conclusions. First, a small increase in radiator size to accommodate heat rejection needs related to new emissions restrictions may be tolerated without significant increases in drag losses. Second, efforts to reduce drag on the tractor requires that the design of the entire tractor be treated in an integrated fashion. Simply reducing the size of the grille will not provide the desired result, but the additional contouring of the vehicle as a whole which may be enabled by the smaller radiator could have a more significant effect.

McCallen, R; Salari, K; Ortega, J; Castellucci, P; Pointer, D; Browand, F; Ross, J; Storms, B

2007-01-04T23:59:59.000Z

159

Dynamics on the Laminar-Turbulent Boundary and the Origin of the Maximum Drag Reduction Asymptote  

E-Print Network [OSTI]

Dynamical trajectories on the boundary in state space between laminar and turbulent plane channel flowedge statesare computed for Newtonian and viscoelastic fluids. Viscoelasticity has a negligible effect on the properties ...

Graham, Michael D.

160

Title: Aerodynamic and Scalar Roughness over Snow and Sea Ice In Monin-Obukhov similarity theory, the aerodynamic roughness, z0, is the artificial height  

E-Print Network [OSTI]

Title: Aerodynamic and Scalar Roughness over Snow and Sea Ice Abstract: In Monin-Obukhov similarity theory, the aerodynamic roughness, z0, is the artificial height above the surface at which the wind speed the theory and measurement of the aerodynamic and scalar roughness lengths over snow and sea ice. The data

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Numerical simulation of laminar flow in a curved duct  

SciTech Connect (OSTI)

This paper describes numerical simulations that were performed to study laminar flow through a square duct with a 900 bend. The purpose of this work was two fold. First, an improved understanding was desired of the flow physics involved in the generation of secondary vortical flows in three-dimensions. Second, adaptive gridding techniques for structured grids in three- dimensions were investigated for the purpose of determining their utility in low Reynolds number, incompressible flows. It was also of interest to validate the commercial computer code CFD-ACE. Velocity predictions for both non-adaptive and adaptive grids are compared with experimental data. Flow visualization was used to examine the characteristics of the flow though the curved duct in order to better understand the viscous flow physics of this problem. Generally, moderate agreement with the experimental data was found but shortcomings in the experiment were demonstrated. The adaptive grids did not produce the same level of accuracy as the non-adaptive grid with a factor of four more grid points.

Lopez, A.R.; Oberkampf, W.L.

1995-01-01T23:59:59.000Z

162

Aerodynamic Analysis of Intermodal Freight Trains Using Machine Vision World Congress on Railway Research, May 22-26, 2011  

E-Print Network [OSTI]

Aerodynamic Analysis of Intermodal Freight Trains Using Machine Vision 9 th World Congress. However, intermodal trains use rolling stock that generates significantly greater aerodynamic drag increases annual operating expenditures. There are opportunities to improve intermodal train aerodynamics

Illinois at Urbana-Champaign, University of

163

Aerodynamic characteristics of a feathered dinosaur measured using physical models. Effects of form on static stability and control effectiveness  

E-Print Network [OSTI]

2007) Fundamentals of Aerodynamics. New York, NY: McGraw-31. McCormick BW (1995) Aerodynamics, Aeronautics and FlightA computational study of the aerodynamics and forewing-

Evangelista, Dennis

2013-01-01T23:59:59.000Z

164

Aerodynamic Effects in Weakly Ionized Gas: Phenomenology and Applications  

SciTech Connect (OSTI)

Aerodynamic effects in ionized gases, often neglected phenomena, have been subject of a renewed interest in recent years. After a brief historical account, we discuss a selected number of effects and unresolved problems that appear to be relevant in both aeronautic and propulsion applications in subsonic, supersonic, and hypersonic flow. Interaction between acoustic shock waves and weakly ionized gas is manifested either as plasma-induced shock wave dispersion and acceleration or as shock-wave induced double electric layer in the plasma, followed by the localized increase of the average electron energy and density, as well as enhancement of optical emission. We describe the phenomenology of these effects and discuss several experiments that still do not have an adequate interpretation. Critical for application of aerodynamic effects is the energy deposition into the flow. We classify and discuss some proposed wall-free generation schemes with respect to the efficiency of energy deposition and overall generation of the aerodynamic body force.

Popovic, S.; Vuskovic, L. [Department of Physics, Old Dominion University, Norfolk, Virginia (United States)

2006-12-01T23:59:59.000Z

165

E-Print Network 3.0 - aerodynamic drag fy Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

fy Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic drag fy Page: << < 1 2 3 4 5 > >> 1 Aerodynamic-Structural Design Studies of...

166

Aerodynamic Focusing of High-Density Aerosols D.E. Ruiza,  

E-Print Network [OSTI]

Aerodynamic Focusing of High-Density Aerosols D.E. Ruiza, , L. Gundersona , M.J. Haya , E. Merinob-density aerosol focusing for 1µm silica spheres. Preliminary results recover previous findings on aerodynamic

167

Film Cooling, Heat Transfer and Aerodynamic Measurements in a Three Stage Research Gas Turbine  

E-Print Network [OSTI]

turbine rotational speeds namely, 2400rpm, 2550rpm and 3000rpm. Interstage aerodynamic measurements with miniature five hole probes are also acquired at these speeds. The aerodynamic data characterizes the flow along the first stage rotor exit, second...

Suryanarayanan, Arun

2010-07-14T23:59:59.000Z

168

Unsteady aerodynamic forces on small-scale wings: experiments, simulations and models  

E-Print Network [OSTI]

Unsteady aerodynamic forces on small-scale wings: experiments, simulations and models Steven L for the unsteady aerodynamics. It is possible to obtain reduced order models by projective methods such as balanced

Dabiri, John O.

169

Product design and development of an aerodynamic hydration system for bicycling and triathlon  

E-Print Network [OSTI]

Proper hydration and aerodynamic performance are both essential needs of a competitive cyclist or triathlete. Several aerodynamic systems have been developed for use on bicycles but few have been designed to be truly ...

Cote, Mark (Mark Brian)

2007-01-01T23:59:59.000Z

170

WING TIP ANATOMY AND AERODYNAMICS IN FLYING National Museum of Natural History, Department of Vertebrate Zoology,  

E-Print Network [OSTI]

WING TIP ANATOMY AND AERODYNAMICS IN FLYING SQUIRRELS National Museum of Natural History aerodynamically sophisticat- back into a curve by the tibiocarpalis mus- ed. They are able to modify shape

Mathis, Wayne N.

171

Investigation of aerodynamic braking devices for wind turbine applications  

SciTech Connect (OSTI)

This report documents the selection and preliminary design of a new aerodynamic braking system for use on the stall-regulated AWT-26/27 wind turbines. The goal was to identify and design a configuration that offered improvements over the existing tip brake used by Advanced Wind Turbines, Inc. (AWT). Although the design objectives and approach of this report are specific to aerodynamic braking of AWT-26/27 turbines, many of the issues addressed in this work are applicable to a wider class of turbines. The performance trends and design choices presented in this report should be of general use to wind turbine designers who are considering alternative aerodynamic braking methods. A literature search was combined with preliminary work on device sizing, loads and mechanical design. Candidate configurations were assessed on their potential for benefits in the areas of cost, weight, aerodynamic noise, reliability and performance under icing conditions. As a result, two configurations were identified for further study: the {open_quotes}spoiler-flap{close_quotes} and the {open_quotes}flip-tip.{close_quotes} Wind tunnel experiments were conducted at Wichita State University to evaluate the performance of the candidate aerodynamic brakes on an airfoil section representative of the AWT-26/27 blades. The wind tunnel data were used to predict the braking effectiveness and deployment characteristics of the candidate devices for a wide range of design parameters. The evaluation was iterative, with mechanical design and structural analysis being conducted in parallel with the braking performance studies. The preliminary estimate of the spoiler-flap system cost was $150 less than the production AWT-26/27 tip vanes. This represents a reduction of approximately 5 % in the cost of the aerodynamic braking system. In view of the preliminary nature of the design, it would be prudent to plan for contingencies in both cost and weight.

Griffin, D.A. [R. Lynette & Associates, Seattle, WA (United States)

1997-04-01T23:59:59.000Z

172

E-Print Network 3.0 - airfoil aerodynamic performance Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Compressors... Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... -dimensional airfoil diffuser designs is presented....

173

Reentry aerodynamic disruption analysis of thermionic reactor-thermo-converter TOPAZ-2  

SciTech Connect (OSTI)

This paper presents preliminary results of analysis for the TOPAZ-2 thermionic converter-reactor aerodynamic disruption during reentry.

Grinberg, E.I.; Nikolaev, V.S. (Scientific Production Association Krasnaya Zvezda'', Moscow 115230 (Russian Federation)); Usov, V.A. (RRC Kurchatov Institute'', Moscow 123182 (Russian Federation)); Gafarov, A.A. (Research Institute of Thermal Processes, Moscow (Russian Federation))

1993-01-15T23:59:59.000Z

174

A Critical Review of Electric and Electromagnetic Flow Control Research Applied to Aerodynamics  

E-Print Network [OSTI]

A Critical Review of Electric and Electromagnetic Flow Control Research Applied to Aerodynamics control (EMFC) to improve aerodynamic performance. This led to an era of research that focused on coupling control concepts applied to control surface aerodynamics have not seen the same level of advancement

Texas at Arlington, University of

175

99--MarMar--0707 11AERODYNAMIC RESEARCH CENTER MECHANICAL AND AEROSPACE ENGINEERING DEPARTMENT  

E-Print Network [OSTI]

99--MarMar--0707 11AERODYNAMIC RESEARCH CENTER MECHANICAL AND AEROSPACE ENGINEERING DEPARTMENT and The National Science Council, Taiwan, ROC ·Philip K. Panicker Aerodynamic Research Center, University of Texas Department, UT Arlington, Arlington, Texas, 76019 #12;99--MarMar--0707 22AERODYNAMIC RESEARCH CENTER

Texas at Arlington, University of

176

Effect of Dynamic Stall on the Aerodynamics of Vertical-Axis Wind Turbines  

E-Print Network [OSTI]

Effect of Dynamic Stall on the Aerodynamics of Vertical-Axis Wind Turbines Frank Scheurich of the aerodynamic performance of vertical-axis wind turbines pose a significant challenge for computational fluid of the aerodynamics of a vertical- axis wind turbine that consists of three curved rotor blades that are twisted

McCalley, James D.

177

Aerodynamic Stability and the Growth of Triangular Snow Crystals K. G. Libbrecht and H. M. Arnold  

E-Print Network [OSTI]

Aerodynamic Stability and the Growth of Triangular Snow Crystals K. G. Libbrecht and H. M. Arnold growth perturbations of the more-typical hexagonal forms. We then describe an aerodynamic model leads to air flow around the crystal that promotes the growth of alternating facets. Aerodynamic effects

Libbrecht, Kenneth G.

178

Monitoring the Aerodynamic Efficiency of Intermodal Train Loading Using Machine Vision  

E-Print Network [OSTI]

Monitoring the Aerodynamic Efficiency of Intermodal Train Loading Using Machine Vision TRB 11 transported by North American railroads. Intermodal trains, however, use equipment that is not aerodynamically significant aerodynamic drag. This high resistance associated with the movement of intermodal trains results

Illinois at Urbana-Champaign, University of

179

Aerodynamics of Two Interfering Simple-Shape Bodies in Hypersonic Rarefied-Gas Flows  

E-Print Network [OSTI]

Aerodynamics of Two Interfering Simple-Shape Bodies in Hypersonic Rarefied-Gas Flows Vladimir V and numerical studies [1-4] of aerodynamics of simple shape bodies have provided valuable information related not be used to define the aerodynamics of side-by-side bodies. Flow about two side-by-side cylinders

Riabov, Vladimir V.

180

Aerodynamically Optimal Regional Aircraft Concepts: Conventional and Blended Wing-Body Designs  

E-Print Network [OSTI]

Aerodynamically Optimal Regional Aircraft Concepts: Conventional and Blended Wing-Body Designs aircraft such as those that serve regional routes. We thus explore the optimal aerodynamic shape of both a blended wing-body and conventional tube-and-wing regional aircraft through high-fidelity aerodynamic shape

Zingg, David W.

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

IMPACT OF TIRE AND AERODYNAMIC AIDS ON TRUCK PERFORMANCE ALONG UPGRADE SECTIONS  

E-Print Network [OSTI]

IMPACT OF TIRE AND AERODYNAMIC AIDS ON TRUCK PERFORMANCE ALONG UPGRADE SECTIONS Hesham Rakha1 and aerodynamics aids on the truck acceleration behavior. The objectives of this paper are two-fold. First of vehicle tires, the vehicle's aerodynamic features, the percentage mass on the tractive axle

Rakha, Hesham A.

182

215BAT AERODYNAMICS Revista Chilena de Historia Natural 78: 215-227, 2005  

E-Print Network [OSTI]

215BAT AERODYNAMICS Revista Chilena de Historia Natural 78: 215-227, 2005 Biomechanical and negatively with the mass corrected wingspan and the second component with the aerodynamic efficiency, showing a high aerodynamic efficiency; (3) most of vespertilionids were in the zone of low speed

183

RANS-based Aerodynamic Shape Optimization Investigations of the Common Research Model Wing  

E-Print Network [OSTI]

RANS-based Aerodynamic Shape Optimization Investigations of the Common Research Model Wing Zhoujie of Michigan, Ann Arbor, MI The aerodynamic shape optimization of transonic wings requires Reynolds, and viscous effects. While there has been some research dedicated to RANS-based aerodynamic shape optimiza

Papalambros, Panos

184

SPIE Aerosense, Vol. 4394, paper 108, April 2001 Aerodynamic sampling for landmine trace detection  

E-Print Network [OSTI]

SPIE Aerosense, Vol. 4394, paper 108, April 2001 Aerodynamic sampling for landmine trace detection research on canine olfactory aerodynamics revealed several ways that evolution has dealt with such problems source, 3) use an aerodynamic collar on the sniffer inlet, 4) use auxiliary airjets to stir up surface

Settles, Gary S.

185

Aerodynamic Loads on Tall Buildings: Interactive Database Yin Zhou. M.ASCE1  

E-Print Network [OSTI]

Aerodynamic Loads on Tall Buildings: Interactive Database Yin Zhou. M.ASCE1 ; Tracy Kijewski, S database of aerodynamic loads is presented, which can be accessed by any user with Microsoft Explorer, the nondimensional aerodynamic loads can be used to compute the wind-induced response of tall buildings

Kareem, Ahsan

186

Fluid-Structure Interaction Simulations of a Tension-Cone Inflatable Aerodynamic Decelerator  

E-Print Network [OSTI]

Fluid-Structure Interaction Simulations of a Tension-Cone Inflatable Aerodynamic Decelerator of an aerodynamic tension-cone supersonic decelerator prototype intended for large mass payload deploy- ment. Introduction The concept of the inflatable aerodynamic decelerator (IAD) was first proposed in the 1960's

Cirak, Fehmi

187

The Analysis of Underexpanded Jet Flows for Hypersonic Aerodynamic Experiments in  

E-Print Network [OSTI]

The Analysis of Underexpanded Jet Flows for Hypersonic Aerodynamic Experiments in Vacuum Chambers V of rarefied-gas flows [1]- [3] and aerodynamics of hypersonic probes in wind tunnels [4]-[7]. The objective using quantum concepts [9], [10]. Aerodynamic characteristics of wedges, disks, and plates are studied

Riabov, Vladimir V.

188

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method  

E-Print Network [OSTI]

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method Enric Roca Le´on Ph Aerodynamics Leader, Airbus Helicopter, Marignane, France Michel Costes Research Engineer, ONERA, Meudon OF THE AMERICAN HELICOPTER SOCIETY Abstract A multi-objective strategy adapted to the aerodynamic concurrent

Paris-Sud XI, Université de

189

PHYSICAL REVIEW E 87, 053021 (2013) Unsteady aerodynamic forces and torques on falling parallelograms in coupled  

E-Print Network [OSTI]

PHYSICAL REVIEW E 87, 053021 (2013) Unsteady aerodynamic forces and torques on falling, these trajectories provide an ideal set of data to analyze 3D aerodynamic force and torque at an intermediate range of Reynolds numbers, and the results will be useful for constructing 3D aerodynamic force and torque models

Wang, Z. Jane

190

Evaluation of the acoustic and aerodynamic constraints of a pneumotachograph for speech and voice studies  

E-Print Network [OSTI]

Evaluation of the acoustic and aerodynamic constraints of a pneumotachograph for speech and voice from its transfer function. 1. INTRODUCTION The measurement of the aerodynamic parameters for the study. The object of this study is to evaluate and correct the acoustic and aerodynamic distortions generated

Paris-Sud XI, Université de

191

GAs for aerodynamic shape design II: multiobjective optimization and multi-criteria design  

E-Print Network [OSTI]

GAs for aerodynamic shape design II: multiobjective optimization and multi-criteria design D, and on their application to multi-criteria design problems. A short introduction to multi- point aerodynamic shape design-lift conditions, and to transonic wing design. 1 Introduction The aerodynamic design problem can be defined

Coello, Carlos A. Coello

192

Development of flexible, intuitive methods for aerodynamic design Type of award PhD Research Studentship  

E-Print Network [OSTI]

Development of flexible, intuitive methods for aerodynamic design Type of award PhD Research is beginning a project to develop new techniques for aerodynamic design. The interest is based around free, they are offering a fully funded 3- year PhD position within the University of Bristol Aerodynamics research group

Bristol, University of

193

Introduction Aerodynamic theory adapted for avian flight (e.g. Tucker,  

E-Print Network [OSTI]

3489 Introduction Aerodynamic theory adapted for avian flight (e.g. Tucker, 1975; Pennycuick, 1989 encompassing optimal foraging and aerodynamic theories. The main hypothesis underlying our model flight strategy selection. We develop a model based on optimal foraging and aerodynamic theories

Loon, E. Emiel van

194

Agricultural and Forest Meteorology 111 (2002) 93108 Estimation of the three-dimensional aerodynamic structure  

E-Print Network [OSTI]

-dimensional aerodynamic structure of a green ash shelterbelt X.H. Zhoua,, J.R. Brandlea, E.S. Takleb,c, C.W. Mized Abstract The three-dimensional aerodynamic structure of a tree shelterbelt is described by two structural be predicted by associating its aerodynamic influence with its struc- ture. The more complex the shelterbelt

Takle, Eugene S.

195

Laboratory Evaluation of Fan-filter Units' Aerodynamic and Energy Performance  

E-Print Network [OSTI]

Laboratory Evaluation of Fan-filter Units' Aerodynamic and Energy Performance Tengfang Xu, Lawrence The paper discusses the benefits of having a consistent testing method to characterize aerodynamic applications. Optimizing aerodynamic performance in air recirculation systems appears to be one of useful

196

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades  

E-Print Network [OSTI]

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades T. Mengistu algorithms, namely Genetic Algorithm (GA) and Simulated Annealing (SA), have been applied to the aerodynamic reduction in total pressure loss by eliminating the passage shock. 1. INTRODUCTION Aerodynamic optimization

Neumaier, Arnold

197

Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body  

E-Print Network [OSTI]

Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body J.fischer@univ-poitiers.fr Proceedings of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 2335 #12;Aerodynamic. The present work is an experimental study of the aerodynamic noise radiated by a three-dimensional simplified

Paris-Sud XI, Université de

198

On the limiting aerodynamic roughness of the ocean in very strong winds  

E-Print Network [OSTI]

On the limiting aerodynamic roughness of the ocean in very strong winds M. A. Donelan,1 B. K. Haus January 2004; accepted 13 August 2004; published 28 September 2004. [1] The aerodynamic friction between, the ``aerodynamic roughness'') increases with the wind speed. Can one merely extrapolate this wind speed tendency

Saltzman, Eric

199

Vocal fold and ventricular fold vibration in period-doubling phonation: Physiological description and aerodynamic  

E-Print Network [OSTI]

and aerodynamic modelinga) Lucie Bailly,b Nathalie Henrich, and Xavier Pelorson Département Parole et Cognition and ventricular areas, the aerodynamic behavior of the laryngeal system is simulated using a simplified physical aerodynamic interaction. Previous experimental in- vestigations dealing with in vitro set

Boyer, Edmond

200

Improvements to a Newton-Krylov Adjoint Algorithm for Aerodynamic Optimization  

E-Print Network [OSTI]

Improvements to a Newton-Krylov Adjoint Algorithm for Aerodynamic Optimization David W. Zingg-based algorithm for aerodynamic optimization. A Newton-Krylov algorithm is used to solve the compressible Navier of the improvements on the performance of the algorithm is presented. I. Introduction Numerical aerodynamic shape

Zingg, David W.

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Surface-Skimming Stoneflies and Mayflies: The Taxonomic and Mechanical Diversity of Two-Dimensional Aerodynamic  

E-Print Network [OSTI]

-Dimensional Aerodynamic Locomotion* James H. Marden Brigid C. O'Donnell Michael A. Thomas Jesse Y. Bye Department be used to accomplish two-dimensional aerodynamic locomotion on the surface of water. Here we extend, horizontal velocity, and the verticality of aerodynamic force production increase as the body orientation

Marden, James

202

Aerodynamic focusing of high-density aerosols D.E. Ruiz a,n  

E-Print Network [OSTI]

Aerodynamic focusing of high-density aerosols D.E. Ruiz a,n , L.M. Gunderson a , M.J. Hay a , E Accepted 24 May 2014 Available online 17 June 2014 Keywords: Aerodynamic lens High-density aerosol beam recover previous findings on aerodynamic focusing at low densities. At higher densities

203

Advances in Modeling of Aerodynamic Forces on Bridge Xinzhong Chen1  

E-Print Network [OSTI]

Advances in Modeling of Aerodynamic Forces on Bridge Decks Xinzhong Chen1 and Ahsan Kareem2 Abstract: Aerodynamic forces on bridges are commonly separated into static, self-excited, and buffeting in modeling aerodynamic forces. Formulations for airfoil sections and those based on quasi- steady theory

Chen, Xinzhong

204

Development of New Grid-Fin Design for Aerodynamic Marco Debiasi1  

E-Print Network [OSTI]

1 Development of New Grid-Fin Design for Aerodynamic Control Marco Debiasi1 Temasek Laboratories of attack = angle of the sharp leading edge = swept-back angle I. Introduction grid fin is an aerodynamic Aerodynamics Conference, Chicago, Illinois, 28 June - 1 July 2010, and as Paper 2012-2909 at the 30th AIAA

Debiasi, Marco

205

Determination of the Aerodynamic Characteristics of Low Reynolds Number Flows over Small Uninhabited Aerial Vehicles  

E-Print Network [OSTI]

Determination of the Aerodynamic Characteristics of Low Reynolds Number Flows over Small, in the 15000 - 500000 range. The high Re aerodynamics is well established, however the same cannot be said for the low Re regime. In this range the wing's aerodynamic performance can deteriorate rapidly as the Re

Olsen, Stephen L.

206

Design Optimization of MultiElement Aerodynamic Configurations Using a Viscous  

E-Print Network [OSTI]

Design Optimization of Multi­Element Aerodynamic Configurations Using a Viscous Adjoint Method.S.A An adjoint-based Navier-Stokes design and optimization method for multi-element aerodynamic configurations effects. Using a viscous continuous adjoint formulation, the necessary aerodynamic gradient information

Kim, Sangho

207

Aerodynamic and aeroacoustic analysis of morphing Type of award PhD Research Studentship  

E-Print Network [OSTI]

Aerodynamic and aeroacoustic analysis of morphing structures Type of award PhD Research Studentship with a strong interest in aerodynamics. Deadline Open until filled. PhD Topic Background/Description Applications are invited for a research studentship in the field of aerodynamics and aeroacoustics, leading

Bristol, University of

208

NONLINEAR AERODYNAMIC ANALYSIS OF BRIDGES UNDER TURBULENT WINDS: THE NEW FRONTIER IN BRIDGE  

E-Print Network [OSTI]

NONLINEAR AERODYNAMIC ANALYSIS OF BRIDGES UNDER TURBULENT WINDS: THE NEW FRONTIER IN BRIDGE AERODYNAMICS Xinzhong Chen , Ahsan Kareem and Fred L. Haan, Jr. ¡ Department of Civil Engineering. These approaches are limited to linear structures in which nonlinearities in aerodynamic forces are ignored

Kareem, Ahsan

209

Progress in Aerospace Sciences 39 (2003) 185248 The unsteady aerodynamics of slender wings and aircraft  

E-Print Network [OSTI]

Progress in Aerospace Sciences 39 (2003) 185­248 The unsteady aerodynamics of slender wings nonlinearities and flow field time lags. The aerodynamic and the vortical flow structure over simple delta wings of leading-edge vortices and their influence on delta wing aerodynamics for stationary models is presented

Nelson, Robert C.

210

International Symposium of Applied Aerodynamics Lille, 24-25-26 March 2014  

E-Print Network [OSTI]

49th International Symposium of Applied Aerodynamics Lille, 24-25-26 March 2014 FP05-2014-paquet Formulation of Aerodynamic Forces on Helicopters in Non Uniform Flow with Scale Model Tests : Ground Effects. The number of state variables influencing the aerodynamic forces are too numerous so it is not possible

211

The Effects of Turbulence on the Aerodynamics of Oscillating Fred L. Haan, Jr a  

E-Print Network [OSTI]

The Effects of Turbulence on the Aerodynamics of Oscillating Prisms Fred L. Haan, Jr a , Ahsan ABSTRACT: This experimental study, focusing on the effects of turbulence on long-span bridge aerodynamics and the spanwise correlation of the overall aerodynamic lift and moment. This exami- nation was conducted

Kareem, Ahsan

212

Courses for Breadth Requirement of Aerospace Engineering M.S. Degree Aerodynamics,  

E-Print Network [OSTI]

Courses for Breadth Requirement of Aerospace Engineering M.S. Degree Program Aerodynamics, Fluid Mechanics, Combustion and Propulsion (AFMCP) AE 410/CSE 461: Computational Aerodynamics AE 412/ME 411: Viscous Flow & Heat Transfer AE 416: Applied Aerodynamics AE 419: Aircraft Flight Mechanics AE 433

Gilbert, Matthew

213

25th AIAA Applied Aerodynamics Conference June 2528, 2007/Miami, FL  

E-Print Network [OSTI]

25th AIAA Applied Aerodynamics Conference June 25­28, 2007/Miami, FL Validation Study of Aerodynamic Analysis Tools for Design Optimization of Helicopter Rotors Seongim Choi , Juan J. Alonso , Edwin current aerodynamic analysis tools in predicting the unsteady flow field generated by helicopter rotors

Alonso, Juan J.

214

International Symposium of Applied Aerodynamics Lille, 24-25-26 March 2014  

E-Print Network [OSTI]

49th International Symposium of Applied Aerodynamics Lille, 24-25-26 March 2014 FP30-2014-toubin on the environment. In order to achieve these ambitious objectives, several ways can be chosen, such as aerodynamic by integrating aerodynamic stresses on the skin (near-field methods), one can equivalently analyze

215

Aerodynamic performance measurements of a film-cooled turbine stage  

E-Print Network [OSTI]

The goal of this research is to measure the aerodynamic performance of a film-cooled turbine stage and to quantify the loss caused by film-cooling. A secondary goal of the research is to provide a detailed breakdown of the ...

Keogh, Rory (Rory Colm), 1968-

2001-01-01T23:59:59.000Z

216

Plasma Aerodynamic Control Effectors for Improved Wind Turbine Performance  

SciTech Connect (OSTI)

Orbital Research Inc is developing an innovative Plasma Aerodynamic Control Effectors (PACE) technology for improved performance of wind turbines. The PACE system is aimed towards the design of "smart" rotor blades to enhance energy capture and reduce aerodynamic loading and noise using flow-control. The PACE system will provide ability to change aerodynamic loads and pitch distribution across the wind turbine blade without any moving surfaces. Additional benefits of the PACE system include reduced blade structure weight and complexity that should translate into a substantially reduced initial cost. During the Phase I program, the ORI-UND Team demonstrated (proof-of-concept) performance improvements on select rotor blade designs using PACE concepts. Control of both 2-D and 3-D flows were demonstrated. An analytical study was conducted to estimate control requirements for the PACE system to maintain control during wind gusts. Finally, independent laboratory experiments were conducted to identify promising dielectric materials for the plasma actuator, and to examine environmental effects (water and dust) on the plasma actuator operation. The proposed PACE system will be capable of capturing additional energy, and reducing aerodynamic loading and noise on wind turbines. Supplementary benefits from the PACE system include reduced blade structure weight and complexity that translates into reduced initial capital costs.

Mehul P. Patel; Srikanth Vasudevan; Robert C. Nelson; Thomas C. Corke

2008-08-01T23:59:59.000Z

217

Aerodynamic Drag Reduction Apparatus For Wheeled Vehicles In Ground Effect  

DOE Patents [OSTI]

An apparatus for reducing the aerodynamic drag of a wheeled vehicle in a flowstream, the vehicle having a vehicle body and a wheel assembly supporting the vehicle body. The apparatus includes a baffle assembly adapted to be positioned upstream of the wheel assembly for deflecting airflow away from the wheel assembly so as to reduce the incident pressure on the wheel assembly.

Ortega, Jason M. (Pacifica, CA); Salari, Kambiz (Livermore, CA)

2005-12-13T23:59:59.000Z

218

Aerodynamic Optimization Under a Range of Operating Conditions  

E-Print Network [OSTI]

Aerodynamic Optimization Under a Range of Operating Conditions David W. Zingg and Samy Elias. This can be achieved through multipoint optimization. The desired performance objective and operating conditions must be speci ed, and the resulting optimization problem must be solved in such a manner

Zingg, David W.

219

Adapting to Limitations of a Wind Tunnel Test Facility in the Aerodynamic Testing of a new UAV  

E-Print Network [OSTI]

Adapting to Limitations of a Wind Tunnel Test Facility in the Aerodynamic Testing of a new UAV Dr K section for aerodynamic tests of aircraft models and aerodynamic devices. Improvements over the years have aerodynamic testing facility, albeit with much reduced capability. This paper reports on initial progress

Wong, K. C.

220

Small is beautiful: Upscaling from microscale laminar to natural turbulent rivers  

E-Print Network [OSTI]

of turbulent and laminar rivers are governed by identical dimensionless equations and therefore follow the same one is the suspended load, consisting of sediment particles small enough to be trans- ported, at least rivers [Allen, 1985; Knighton, 1998]. Sand-size particles can also be part of the suspended load

Lajeunesse, Eric

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Electrostatic dynamo in reversed field pinch plasmas: simple common fundamental nature of laminar and turbulent regimes  

SciTech Connect (OSTI)

Within the framework of magnetohydrodynamic (MHD) numerical modelling, the Reversed Field Pinch (RFP) has been found to develop turbulent or laminar regimes switching from the former to the latter in a continuous way depending on the strength of dissipative forces. The laminar solution corresponds to a simple global helical deformation of the current channel. A helically-modulated electrostatic field arises in order to account for the helical modulation of the current density along magnetic field lines. The associated electrostatic drift yields the main component of the dynamo velocity field. The continuity of the transition between the two regimes suggests that the simple laminar helical solution can provide a fruitful intuitive description of the RFP dynamo in general. In fact, the electrostatic drift remains the main component of the dynamo velocity field in the non-stationary turbulent regime for a sustained RFP. We show that the same dynamo action, due to the electrostatic drift, is provided either by one single mode and its harmonics, as in the laminar regime, or by a rich spectrum of modes with the action of full nonlinear coupling, as in the turbulent one. Here, we review our previous work and present new elements to clarify the physics of the RFP dynamo. Many of the MHD predictions are in good agreement with experimental findings.

Bonfiglio, D.; Cappello, S. [Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, Padova (Italy); Escande, D. F. [Consorzio RFX, Associazione EURATOM-ENEA sulla fusione, Padova (Italy); CNRS-Universite de Provence, Marseille (France)

2006-11-30T23:59:59.000Z

222

On the extraction of laminar flame speed and Markstein length from outwardly propagating spherical flames  

SciTech Connect (OSTI)

Large discrepancies among the laminar flame speeds and Markstein lengths of methane/air mixtures measured by different researchers using the same constant-pressure spherical flame method are observed. As an effort to reduce these discrepancies, one linear model (LM, the stretched flame speed changes linearly with the stretch rate) and two non-linear models (NM I and NM II, the stretched flame speed changes non-linearly with the stretch rate) for extracting the laminar flame speed and Markstein length from propagating spherical flames are investigated. The accuracy and performance of the LM, NM I, and NM II are found to strongly depend on the Lewis number. It is demonstrated that NM I is the most accurate for mixtures with large Lewis number (positive Markstein length) while NM II is the most accurate for mixtures with small Lewis number (negative Markstein length). Therefore, in order to get accurate laminar flame speed and Markstein length from spherical flame experiments, different non-linear models should be used for different mixtures. The validity of the theoretical results is further demonstrated by numerical and experimental studies. The results of this study can be used directly in spherical flame experiments measuring the laminar flame speed and Markstein length. (author)

Chen, Zheng [State Key Laboratory for Turbulence and Complex Systems, Department of Mechanics and Aerospace Engineering, College of Engineering, Peking University, Beijing 100871 (China)

2011-02-15T23:59:59.000Z

223

Determination of kinetic parameters in laminar flow reactors. I. Theoretical aspects  

E-Print Network [OSTI]

is the numerical evaluation of kinetic data, obtained from controlled experiments in a flow reactorDetermination of kinetic parameters in laminar flow reactors. I. Theoretical aspects T. Carraro1- mization of chemical flow reactors. The goal is the reliable determination of unknown kinetic parameters

224

Copyright 2007 by ASME1 Laminar Flame Speeds and Strain Sensitivities of Mixtures of H2  

E-Print Network [OSTI]

to rich. [Keywords: Syngas, laminar flame speed, reactant preheat, CO2 dilution, N2 dilution] INTRODUCTION emissions. Synthetic gas (syngas) fuels derived from coal are particularly promising in this regard. Syngas, provides a significant barrier to syngas usage. Understanding the impact of this variability on combustor

Seitzman, Jerry M.

225

Characterization of Limiting Factors in Laminar Flow-Based Membraneless Microfuel Cells  

E-Print Network [OSTI]

are underway to develop and optimize microscale fuel cells as high-energy-density power source alternatives, where fuel and oxidant are oxidized and re- duced, respectively, is essential for fuel cell optimization reports the analysis of a microflu- idic fuel cell based on laminar flow using an external reference

Kenis, Paul J. A.

226

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman  

E-Print Network [OSTI]

A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent

227

Solution of Laminar Diffusion Flames Using a Parallel Adaptive Mesh Refinement Algorithm  

E-Print Network [OSTI]

, chemical kinetics, and thermodynamic properties of the reactants and products), each with their own to the prediction of the structure of non-premixed axisymmetric methane-air laminar diffusion flames. The parallel refers to the complex physical/chemical processes by which a fuel and oxidizer undergo irre- versible

Groth, Clinton P. T.

228

Effects of Lewis number and ignition energy on the determination of laminar flame speed  

E-Print Network [OSTI]

, it affects the fuel burning rate in internal combustion engines and the engine's performance and emissions Engineering, Princeton University, Princeton, NJ 08544, USA Abstract The trajectories of outwardly propagating. Published by Elsevier Inc. on behalf of The Combustion Institute. Keywords: Laminar flame speed; Spherical

Ju, Yiguang

229

Hybrid Mesons  

E-Print Network [OSTI]

The SU(3)_flavor constituent quark model has been quite successful to explain the properties as well as the observed spectrum of mesons with pseudoscalar and vector quantum numbers. Many radial and orbital excitations of quark-antiquark systems predicted by the model, however, have not yet been observed experimentally or assigned unambiguously. In addition, a much richer spectrum of mesons is expected from QCD, in which quarks interact which each other through the exchange of colored self-interacting gluons. Owing to this particular structure of QCD, configurations are allowed in which an excited gluonic field contributes to the quantum numbers J^{PC} of the meson. States with a valence color-octet qqbar' pair neutralized in color by an excited gluon field are termed hybrids. The observation of such states, however, is difficult because they will mix with ordinary qqbar' states with the same quantum numbers, merely augmenting the observed spectrum for a given J^{PC}. Since the gluonic field may carry quantum numbers other than 0^{++}, however, this can give rise to states with "exotic" quantum numbers J^{PC}=0^{--}, 0^{+-}, 1^{-+}, 2^{+-},... The lowest-lying hybrid multiplet is expected to contain a state with exotic quantum numbers J^{PC}=1^{-+}. The identification of such a state is considered a "smoking gun" for the observation of non-qqbar mesons. The search for hybrid states has been a central goal of hadron spectroscopy in the last 20 years. Ongoing and upcoming high-statistics experiments are expected to shed new light on the existence of such states in nature. In this paper, theoretical predictions for masses and decay modes as well as recent experimental evidence for hybrid meson states and future experimental directions are discussed.

Bernhard Ketzer

2012-08-25T23:59:59.000Z

230

Inclusion of nonlinear aerodynamics in the FLAP code  

SciTech Connect (OSTI)

Horizontal axis wind turbines usually operate with significant portions of the blade in deep stall. This contradicts the assumption in the FLAP code that a linear relation exists between the angle of attack and the lift coefficient. The objective of this paper is to determine the importance of nonlinear aerodynamics in the prediction of loads. The FLAP code has been modified to include the nonlinear relationships between the lift and drag coefficients with the angle of attack. The modification affects the calculation of the induced velocities and the aerodynamic loads. This requires an iterative procedure to determine the induced velocities instead of a closed form solution. A more advanced tower interference model has also been added that accounts for both upwind and downwind tower effects. 7 refs., 14 figs.

Weber, T. (Solar Energy Research Inst., Golden, CO (USA)) [Solar Energy Research Inst., Golden, CO (USA)

1989-11-01T23:59:59.000Z

231

Influence of a humidor on the aerodynamics of baseballs  

E-Print Network [OSTI]

We investigate whether storing baseballs in a controlled humidity environment significantly affects their aerodynamic properties. To do this, we measure the change in diameter and mass of baseballs as a function of relative humidity (RH) in which the balls are stored. We then model trajectories for pitched and batted baseballs to assess the difference between those stored at 30% RH versus 50% RH. The results show that a drier baseball may be expected to curve slightly more than a humidified one for a given pitch velocity. We also find that the aerodynamics alone would add ~2 feet to the distance a moister ball is hit. However, this is compensated by a ~6 foot reduction in batted distance due to the well known change in coefficient of restitution of the ball. We discuss consequences of these results for baseball played at Coors Field in Denver, where baseballs have been stored in a humidor at 50% RH since 2002.

Edmund Meyer; John Bohn

2008-02-29T23:59:59.000Z

232

Effect of Blending on High-Pressure Laminar Flame Speed Measurements, Markstein Lengths, and Flame Stability of Hydrocarbons  

E-Print Network [OSTI]

for pure fuels and their blends for laminar flame speed and high-temperature shock-tube and low-temperature RCM ignition target data (Lowry et al., 2010a; Petersen et al., 2007; Healy et al., 2008a, 2008b), for the laminar flame speed of pure DME... enthalpy (KJ/kg) Le Lewis Number g1865g4662 " Mass burning rate per unit area (kg/m2-s) g1839g3050 Molecular weight (kg/kmol) X Mole fraction (kmol/kmol) g1851 Mass fraction (kg/kg) Subscripts b Burned condition i For species i L Laminar flame u...

Lowry, William Baugh

2012-02-14T23:59:59.000Z

233

Hybrid: Overview  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun withconfinement plasmasSandy-Nor'easter SituationHybridVehicles and

234

E-Print Network 3.0 - aerodynamic test facilities Sample Search...  

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Airfoil Summary: Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... compressor stage are discussed. A test case of the...

235

E-Print Network 3.0 - aerodynamics performance cooling Sample...  

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Airfoil Summary: Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... are compared. The analysis is presented both in terms...

236

E-Print Network 3.0 - aerodynamics final technical Sample Search...  

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Airfoil Summary: Design Ahmed Abdelwahab Manager of Turbomachinery Aerodynamics Praxair Inc., Global Supply System... as the detailed flow-field features. Finally Concluding...

237

E-Print Network 3.0 - applied aerodynamics conference Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of Aerospace Engineering, Texas A&M University Collection: Engineering 2 Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 15111528 Summary: Journal of Wind...

238

E-Print Network 3.0 - aerodynamic flow simulation Sample Search...  

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(ICCEPT) Collection: Multidisciplinary Databases and Resources 4 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: . The authors directly...

239

E-Print Network 3.0 - aerodynamic force measurement Sample Search...  

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Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 3 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: of the random wind...

240

E-Print Network 3.0 - aerodynamic parameter estimation Sample...  

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Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 3 Journal of Wind Engineering and Industrial Aerodynamics 91 (2003) 15111528 Summary: in the identification...

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While these samples are representative of the content of NLEBeta,
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to obtain the most current and comprehensive results.


241

E-Print Network 3.0 - aerodynamic force acting Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 2 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: as the approach flow,...

242

E-Print Network 3.0 - aerodynamic load prediction Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Geological Sciences, University of Notre Dame Collection: Engineering 4 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: a time domain framework...

243

E-Print Network 3.0 - aerodynamic force Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 4 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: of the random wind...

244

E-Print Network 3.0 - aerodynamic forces acting Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Ecole Polytechnique, Centre de mathmatiques Collection: Mathematics 2 Journal of Wind Engineering and Industrial Aerodynamics 90 (2002) 639642 Summary: as the approach flow,...

245

E-Print Network 3.0 - aerodynamic noise propagation Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Biology and Medicine 5 AIAA-2004-1184 AN AEROACOUSTIC ANALYSIS OF WIND TURBINES* Summary: noise, the aerodynamics and aeroacoustics of rotating blades, and the...

246

E-Print Network 3.0 - aero-elasticity rotor aerodynamics Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: HVDC 12;Rotor aero-elastics and structural dynamics 12;Aerodynamics for wind turbines Flow over... and components Rotor aero-elastics and structural dynamics Grid...

247

DOEs Effort to Reduce Truck Aerodynamic Drag through Joint...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Experiments DOEs Effort to Reduce Truck Aerodynamic Drag through Joint Experiments Presentation from the U.S. DOE Office of Vehicle Technologies "Mega" Merit Review 2008 on...

248

E-Print Network 3.0 - aerodynamics experiment phase Sample Search...  

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wings that use... computational analysis as capable of attaining very different aerodynamic ... Source: Kirby, Brian J. - Sibley School of Mechanical and Aerospace...

249

E-Print Network 3.0 - aerodynamic drag reduction Sample Search...  

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Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic drag reduction Page: << < 1 2 3 4 5 > >> 1 Australasian Fluid Mechanics Conference...

250

E-Print Network 3.0 - aerodynamic performance evaluation Sample...  

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Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic performance evaluation Page: << < 1 2 3 4 5 > >> 1 Morphing Aircraft Dynamical...

251

DOEs Effort to Reduce Truck Aerodynamic Drag through Joint...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

D.C. vss14salari.pdf More Documents & Publications DOEs Effort to Reduce Truck Aerodynamic Drag through Joint Experiments and Computations Vehicle Technologies Office Merit...

252

DOEs Effort to Reduce Truck Aerodynamic Drag through Joint...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Experiments and Computations DOEs Effort to Reduce Truck Aerodynamic Drag through Joint Experiments and Computations 2010 DOE Vehicle Technologies and Hydrogen Programs Annual...

253

E-Print Network 3.0 - aerodynamic flow control Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic flow control Page: << < 1 2 3 4 5 > >> 1 Australasian Fluid Mechanics Conference...

254

E-Print Network 3.0 - aerodynamic predictions comparisons Sample...  

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Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic predictions comparisons Page: << < 1 2 3 4 5 > >> 1 Australasian Fluid Mechanics...

255

E-Print Network 3.0 - aerodynamic decelerator systems Sample...  

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Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic decelerator systems Page: << < 1 2 3 4 5 > >> 1 Fundamental Fundamental Summary:...

256

E-Print Network 3.0 - aerodynamic characteristics research Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engineering 30 American Institute of Aeronautics and Astronautics Aerodynamics of Ice Remnants from Protected Surfaces Summary: and describe what is known about the...

257

E-Print Network 3.0 - aerodynamic stability study Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of the aerodynamic resistance S. Liu, D. Mao, and L. Lu State key Laboratory of Remote Sensing ... Source: Ecole Polytechnique, Centre de mathmatiques Collection:...

258

E-Print Network 3.0 - aerodynamic lift Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mayuresh - Department of Aerospace and Ocean Engineering, Virginia Tech Collection: Engineering 9 ME422. Fluid II Victor Yakhot Summary: , nanofluidics , basic aerodynamics...

259

E-Print Network 3.0 - aerodynamic noise generated Sample Search...  

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and Aerospace Engineering, Aerodynamics Research Center Collection: Engineering 12 ENERGY PERSPECTIVES IN AEROELASTIC CONTROL Mayuresh J. Patil Summary: from the flow. The...

260

E-Print Network 3.0 - aerodynamic converter etudes Sample Search...  

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clearance increased lift and decreased drag for varied AoA. Introduction Aerodynamic devices such as wings... and tyres (downforce). This can increase the performance envelope...

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

E-Print Network 3.0 - aerodynamic loads estimated Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

We conducted... due to the aerodynamic effect. Furthermore, the weight penalties of a train ... Source: Barkan, Christopher P.L. - Railroad Engineering Program & Department of...

262

E-Print Network 3.0 - aerodynamic noise Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Boston University Collection: Engineering 5 CURVE FlTTlNG PROCEDURES FOR HIGH SPEED TRAINS Summary: - an aerodynamic noise which predominates at high speeds. Each noise...

263

E-Print Network 3.0 - aerodynamic size associations Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Engineering 13 Machine Vision Analysis of the Energy Efficiency of Intermodal Trains Summary: -in-Train on Aerodynamic Resistance, Publication R-705. Association of...

264

E-Print Network 3.0 - aerodynamic noise reduction Sample Search...  

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of Melbourne Collection: Engineering 3 CURVE FlTTlNG PROCEDURES FOR HIGH SPEED TRAINS Summary: - an aerodynamic noise which predominates at high speeds. Each noise...

265

Dispersion of swimming algae in laminar and turbulent channel flows: theory and simulations  

E-Print Network [OSTI]

Algal swimming is often biased by environmental cues, e.g. gravitational and viscous torques drive cells towards downwelling fluid (gyrotaxis). In view of biotechnological applications, it is important to understand how such biased swimming affects cell dispersion in a flow. Here, we study the dispersion of gyrotactic swimming algae in laminar and turbulent channel flows. By direct numerical simulation (DNS) of cell motion within upwelling and downwelling channel flows, we evaluate time-dependent measures of dispersion for increasing values of the flow Peclet (Reynolds) numbers, Pe (Re). Furthermore, we derive an analytical `swimming Taylor-Aris dispersion' theory, using flow-dependent transport parameters given by existing microscopic models. In the laminar regime, DNS results and analytical predictions compare very well, providing the first confirmation that cells' response to flow is best described by the generalized-Taylor-dispersion microscopic model. We predict that cells drift along a channel faster th...

Croze, O A; Ahmed, M; Bees, M A; Brandt, L

2012-01-01T23:59:59.000Z

266

On the structure, propagation, and stabilization of laminar premixed flames. Final report  

SciTech Connect (OSTI)

The primary objective of the funded program was to qualitatively understand and quantitatively determine the structure and dynamics of laminar premixed flames. The investigation was conducted using laser-based experimentation, computational simulation with detailed chemistry and transport, and activation energy asymptotic analysis. Highlights of accomplishments were discussed in the annual reports submitted to the program monitor for this project. Details are reported in the thirty journal publications cited in the journal article list which is the major component of this final report.

Law, Chung K.

1999-07-01T23:59:59.000Z

267

Laminar and turbulent nozzle-jet flows and their acoustic near-field  

SciTech Connect (OSTI)

We investigate numerically the effects of nozzle-exit flow conditions on the jet-flow development and the near-field sound at a diameter-based Reynolds number of Re{sub D} = 18?100 and Mach number Ma = 0.9. Our computational setup features the inclusion of a cylindrical nozzle which allows to establish a physical nozzle-exit flow and therefore well-defined initial jet-flow conditions. Within the nozzle, the flow is modeled by a potential flow core and a laminar, transitional, or developing turbulent boundary layer. The goal is to document and to compare the effects of the different jet inflows on the jet flow development and the sound radiation. For laminar and transitional boundary layers, transition to turbulence in the jet shear layer is governed by the development of Kelvin-Helmholtz instabilities. With the turbulent nozzle boundary layer, the jet flow development is characterized by a rapid changeover to a turbulent free shear layer within about one nozzle diameter. Sound pressure levels are strongly enhanced for laminar and transitional exit conditions compared to the turbulent case. However, a frequency and frequency-wavenumber analysis of the near-field pressure indicates that the dominant sound radiation characteristics remain largely unaffected. By applying a recently developed scaling procedure, we obtain a close match of the scaled near-field sound spectra for all nozzle-exit turbulence levels and also a reasonable agreement with experimental far-field data.

Bhler, Stefan; Obrist, Dominik; Kleiser, Leonhard [Institute of Fluid Dynamics, ETH Zurich, 8092 Zurich (Switzerland)

2014-08-15T23:59:59.000Z

268

Soot formation in laminar premixed methane/oxygen flames at atmospheric pressure  

SciTech Connect (OSTI)

Flame structure and soot formation were studied within soot-containing laminar premixed methane/oxygen flames at atmospheric pressure. The following measurements were made: soot volume fractions by laser extinction, soot temperatures by multiline emission, gas temperatures (where soot was absent) by corrected fine-wire thermocouples, soot structure by thermophoretic sampling and transmission electron microscope (TEM), major gas species concentrations by sampling and gas chromatography, and gas velocities by laser velocimetry. Present measurements of gas species concentrations were in reasonably good agreement with earlier measurements due to Ramer et al. as well as predictions based on the detailed mechanisms of Frenklach and co-workers and Leung and Lindstedt; the predictions also suggest that H atom concentrations are in local thermodynamic equilibrium throughout the soot formation region. Using this information, it was found that measured soot surface growth rates could be correlated successfully by predictions based on the hydrogen-abstraction/carbon-addition (HACA) mechanisms of both Frenklach and co-workers and Colket and Hall, extending an earlier assessment of these mechanisms for premixed ethylene/air flames to conditions having larger H/C ratios and acetylene concentrations. Measured primary soot particle nucleation rates were somewhat lower than the earlier observations for laminar premixed ethylene/air flames and were significantly lower than corresponding rates in laminar diffusion flames, for reasons that still must be explained.

Xu, F.; Lin, K.C.; Faeth, G.M. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering] [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering

1998-10-01T23:59:59.000Z

269

Aerodynamic size associations of natural radioactivity with ambient aerosols  

SciTech Connect (OSTI)

The aerodynamic size of /sup 214/Pb, /sup 212/Pb, /sup 210/Pb, /sup 7/Be, /sup 32/P, /sup 35/S (as SO/sub 4//sup 2 -/), and stable SO/sub 4//sup 2 -/ was measured using cascade impactors. The activity distribution of /sup 212/Pb and /sup 214/Pb, measured by alpha spectroscopy, was largely associated with aerosols smaller than 0.52 ..mu..m. Based on 46 measurements, the activity median aerodynamic diameter of /sup 212/Pb averaged 0.13 ..mu..m (sigma/sub g/ = 2.97), while /sup 214/Pb averaged 0.16 ..mu..m (sigma/sub g/ = 2.86). The larger median size of /sup 214/Pb was attributed to ..cap alpha..-recoil depletion of smaller aerosols following decay of aerosol-associated /sup 218/Po. Subsequent /sup 214/Pb condensation on all aerosols effectively enriches larger aerosols. /sup 212/Pb does not undergo this recoil-driven redistribution. Low-pressure impactor measurements indicated that the mass median aerodynamic diameter of SO/sub 4//sup 2 -/ was about three times larger than the activity median diameter /sup 212/Pb, reflecting differences in atmospheric residence times as well as the differences in surface area and volume distributions of the atmospheric aerosol. Cosmogenic radionuclides, especially /sup 7/Be, were associated with smaller aerosols than SO/sub 4//sup 2 -/ regardless of season, while /sup 210/Pb distributions in summer measurements were similar to sulfate but smaller in winter measurements. Even considering recoil following /sup 214/Po ..cap alpha..-decay, the avervage /sup 210/Pb labeled aerosol grows by about a factor of two during its atmospheric lifetime. The presence of 5 to 10% of the /sup 7/Be on aerosols greater than 1 ..mu..m was indicative of post-condensation growth, probably either in the upper atmosphere or after mixing into the boundary layer.

Bondietti, E.A.; Papastefanou, C.; Rangarajan, C.

1986-04-01T23:59:59.000Z

270

Aerodynamic design considerations for a free-flying ducted propeller  

SciTech Connect (OSTI)

The design philosophy for a free-flying vehicle powered by a ducted propeller is presented from an aerodynamic viewpoint. Airframe design concentrates on duct inlet lip curvature, diffuser angle, and methods of vehicle control. Wind tunnel test results are given to evaluate two inlet designs, two exit designs, and the effect of external appendages such as a camera pod or a forebody. Finally, a simple, analytic method of ducted propeller blade design is presented and the results compared with an existing ducted propeller blade. 14 refs., 28 figs., 2 tabs.

Weir, R.J.

1988-01-01T23:59:59.000Z

271

Aerodynamic Lightweight Cab Structure Components | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartment of EnergyAdministrative2|Department ofDepartmentProposedAerodynamic

272

A Computational Method for Determining Distributed Aerodynamic Loads on Planforms of Arbitrary Shape in Compressible Subsonic Flow  

E-Print Network [OSTI]

The methods presented in this work are intended to provided an easy to understand and easy to apply method for determining the distributed aerodynamic loads and aerodynamic characteristics of planforms of nearly arbitrary shape. Through application...

Brown, Matthew Alan

2013-12-31T23:59:59.000Z

273

Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer  

E-Print Network [OSTI]

We have designed and characterized a new inlet and aerodynamic lens for the Aerodyne aerosol mass spectrometer (AMS) that transmits particles between 80 nm and more than 3 ?m in vacuum aerodynamic diameter. The design of ...

Williams, L. R.

274

Journal of Industrial Aerodynamics, 3 (1978) 251--257 251 Elsevier Scientific Publishing Company, Amsterdam --Printed in The Netherlands  

E-Print Network [OSTI]

Journal of Industrial Aerodynamics, 3 (1978) 251--257 251 © Elsevier Scientific Publishing Company strong vortices. Both of these properties were used in the design of the aerodynamic dampers which

Hunt, Julian

275

Bericht des Instituts f ur Aerodynamik und Str omungstechnik Report of the Institute of Aerodynamics and Flow Technology  

E-Print Network [OSTI]

of Aerodynamics and Flow Technology IB 124-2008/1 Discontinuous Galerkin Methods for inviscid low Mach number of Alessandra Nigro at the Institute of Aerodynamics and Flow Technology at the DLR, Braunschweig. This work has

Hartmann, Ralf

276

WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES  

E-Print Network [OSTI]

1 WIND-TUNNEL STUDY ON AERODYNAMIC PERFORMANCE OF SMALL VERTICAL-AXIS WIND TURBINES J. J. Miau*1 were carried out to study the aerodynamic performance of three vertical axis wind turbines (VAWTs. On the other hand, the characteristics of unsteady flow around the helical wind turbine were studied with a hot

Leu, Tzong-Shyng "Jeremy"

277

Tracking an Aerodynamic Model in a Wind Tunnel with a Stereo High-speed Imaging System  

E-Print Network [OSTI]

Tracking an Aerodynamic Model in a Wind Tunnel with a Stereo High-speed Imaging System Lichuan Gui in wind tunnel tests with a stereo high-speed imaging system. The imaging system includes two high angle, pitch angle and yaw angle of the aerodynamic model in the wind tunnel. Tests and simulations were

Gui, Lichuan

278

Numerical Investigation of a Wind Turbine Rotor with an aerodynamically redesigned hub-region  

E-Print Network [OSTI]

Numerical Investigation of a Wind Turbine Rotor with an aerodynamically redesigned hub-region J methods on a redesigned modern Mega-Watt sized wind turbine, where the new design includes an increase of the blade in the vicinity of the wind turbine nacelle, to obtain an aerodynamically more efficient rotor

279

Wind turbine trailing-edge aerodynamic brake design  

SciTech Connect (OSTI)

This report describes the design of a centrifugally actuated aerodynamic-overspeed device for a horizontal-axis wind turbine. The device will meet the following criteria; (1) It will be effective for airfoil angles of attack 0{degrees} to 45{degrees}. (2) It will be stowed inside the blade profile prior to deployment. (3) It will be capable of offsetting the positive torque produced by the overall blade. (4) Hinge moments will be minimized to lower actuator loads and cost. (5) It will be evaluated as a potential power modulating active rotor-control system. A literature review of aerodynamic braking devices was conducted. Information from the literature review was used to conceptualize the most effective devices for subsequent testing and design. Wind-tunnel test data for several braking devices are presented in this report. Using the data for the most promising configuration, a preliminary design was developed for a MICON 65/13 wind turbine with Phoenix 7.9-m rotor blades.

Quandt, G.

1996-01-01T23:59:59.000Z

280

Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe with the ERS scatterometer  

E-Print Network [OSTI]

Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe 2005. [1] Estimates of the aerodynamic roughness lengths z0 in arid and semi-arid regions: Prigent, C., I. Tegen, F. Aires, B. Marticorena, and M. Zribi (2005), Estimation of the aerodynamic

Aires, Filipe

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

An empirical expression to relate aerodynamic and surface temperatures for use within1 single-source energy balance models2  

E-Print Network [OSTI]

1 n.1 An empirical expression to relate aerodynamic and surface temperatures for use within1 single that the14 reference temperature for the estimation of convective fluxes, the aerodynamic temperature, is15 between the aerodynamic22 and the air temperatures and the difference between the surface and the air

Paris-Sud XI, Université de

282

STAGGEREDMESH COMPUTATION FOR AERODYNAMIC G.S. Djambazov \\Lambda , C.H. Lai y & K.A. Pericleous z  

E-Print Network [OSTI]

STAGGERED­MESH COMPUTATION FOR AERODYNAMIC SOUND G.S. Djambazov \\Lambda , C.­H. Lai y & K the applicability of a combined technique for aerodynamic sound simulation based on the staggered acoustic routines in magnitude and scale of the quantities involved. Aerodynamic sound is generated as a result

Lai, Choi-Hong

283

Marques, Flvio Donizeti (1997) Multi-layer functional approximation of non-linear unsteady aerodynamic response. PhD thesis.  

E-Print Network [OSTI]

aerodynamic response. PhD thesis. http://theses.gla.ac.uk/2091/ Copyright and moral rights for this thesis-LAYER FUNCTIONAL APPROXIMATION OF NON-LINEAR UNSTEADY AERODYNAMIC RESPONSE by Flavio Donizeti Marques Thesis 1997 CopYright 1997 Flavio Donizet i Marques, #12;Abstract Non-linear unsteady aerodynamic effects

Glasgow, University of

284

American Institute of Aeronautics and Astronautics Paper 2009-1299 Unsteady Aerodynamics and Wing Kinematics Effect in  

E-Print Network [OSTI]

1 American Institute of Aeronautics and Astronautics Paper 2009-1299 Unsteady Aerodynamics and Wing of unsteady aerodynamic mechanisms such as wake capture, leading-edge vortex, Weis­Fogh "clap aerodynamics are of particular interests in this study. Simulations have shown that the vortex topologies

285

Transitions between turbulent and laminar superfluid vorticity states in the outer core of a neutron star  

E-Print Network [OSTI]

We investigate the global transition from a turbulent state of superfluid vorticity to a laminar state, and vice versa, in the outer core of a neutron star. By solving numerically the hydrodynamic Hall-Vinen-Bekarevich-Khalatnikov equations for a rotating superfluid in a differentially rotating spherical shell, we find that the meridional counterflow driven by Ekman pumping exceeds the Donnelly-Glaberson threshold throughout most of the outer core, exciting unstable Kelvin waves which disrupt the rectilinear vortex array, creating a vortex tangle. In the turbulent state, the torque exerted on the crust oscillates, and the crust-core coupling is weaker than in the laminar state. This leads to a new scenario for the rotational glitches observed in radio pulsars: a vortex tangle is sustained in the differentially rotating outer core by the meridional counterflow, a sudden spin-up event brings the crust and core into corotation, the vortex tangle relaxes back to a rectilinear vortex array, then the crust spins down electromagnetically until enough meridional counterflow builds up to reform a vortex tangle. The turbulent-laminar transition can occur uniformly or in patches; the associated time-scales are estimated from vortex filament theory. We calculate numerically the global structure of the flow with and without an inviscid superfluid component, for Hall-Vinen and Gorter-Mellink forms of the mutual friction. We also calculate the post-glitch evolution of the angular velocity of the crust and its time derivative, and compare the results with radio pulse timing data, predicting a correlation between glitch activity and Reynolds number.

C. Peralta; A. Melatos; M. Giacobello; A. Ooi

2006-07-08T23:59:59.000Z

286

Field descriptions for a developing laminar tube flow with and without a concentrically located spherical obstacle  

E-Print Network [OSTI]

By Br" r Br" By (6) B'w 1 Bw Bgw Bn . Bw . Bw += ?. += ? . = Re (u ?. + w=) BrB r" Br By2 By r Br By (7) The nonlinear equations (6) and (7) are second order in the nondimensional radial and axial velocity, respectively, and require eight boundary... Approved as to style and content by: (C airman f Commit tee) (Co-Chairman of Committee) A Q' (Head of Dep rtment) P -, qg/, . 7 (Member) (M er) /7 Z~t j&dgc- December 1972 ABSTRACT Field Descriptions for a Developing Laminar Tube Flow...

Mikkelsen, Clark Douglas

2012-06-07T23:59:59.000Z

287

Experimental and numerical study of laminar forced convection heat transfer for a dimpled heat sink  

E-Print Network [OSTI]

characteristics in a laminar and a turbulent airflow condition. A relative dimple depth in the range of 0.06 to 0.24 and a SIMPLEC (Semi-Implicit Method for Pressure-Linked Equations) method with multiblock grids were used to evaluate the flow change and heat....3) 4.3 Computation Procedure The computations of the fluid flow field and heat transfer were performed using CFD by Fluent software, version Fluent 6.2.16. Gambit 2.2.30 was used for the development of the computational grid. 4.3.1 Computational...

Park, Do Seo

2009-05-15T23:59:59.000Z

288

Routing in hybrid networks  

E-Print Network [OSTI]

Hybrid networks are networks that have wired as well as wireless components. Several routing protocols exist for traditional wired networks and mobile ad-hoc networks. However, there are very few routing protocols designed for hybrid networks...

Gupta, Avinash

2001-01-01T23:59:59.000Z

289

Vacuum chamber with a supersonic-flow aerodynamic window  

DOE Patents [OSTI]

A supersonic flow aerodynamic window is disclosed whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

Hanson, C.L.

1980-10-14T23:59:59.000Z

290

Vacuum chamber with a supersonic flow aerodynamic window  

DOE Patents [OSTI]

A supersonic flow aerodynamic window, whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

Hanson, Clark L. (Livermore, CA)

1982-01-01T23:59:59.000Z

291

Finding the Force -- Consistent Particle Seeding for Satellite Aerodynamics  

E-Print Network [OSTI]

When calculating satellite trajectories in low-earth orbit, engineers need to adequately estimate aerodynamic forces. But to this day, obtaining the drag acting on the complicated shapes of modern spacecraft suffers from many sources of error. While part of the problem is the uncertain density in the upper atmosphere, this works focuses on improving the modeling of interacting rarified gases and satellite surfaces. The only numerical approach that currently captures effects in this flow regime---like self-shadowing and multiple molecular reflections---is known as test-particle Monte Carlo. This method executes a ray-tracing algorithm to follow particles that pass through a control volume containing the spacecraft and accumulates the momentum transfer to the body surfaces. Statistical fluctuations inherent in the approach demand particle numbers in the order of millions, often making this scheme too costly to be practical. This work presents a parallel test-particle Monte Carlo method that takes advantage of b...

Parham, J Brent

2013-01-01T23:59:59.000Z

292

Aerodynamic testing of a rotating wind turbine blade  

SciTech Connect (OSTI)

Aerodynamic, load, flow-visualization, and inflow measurements were taken on a downwind horizontal-axis wind turbine (HAWT). A video camera mounted on the rotor recorded video images of tufts attached to the low-pressure side of the blade. Strain gages, mounted every 10% of the blade's span, provided load and pressure measurements. Pressure taps at 32 chordwise positions recorded pressure distributions. Wind inflow was measured via a vertical-plane array of anemometers located 10 m upwind. The objectives of the test were to address whether airfoil pressure distributions measured on a rotating blade differed from those measured in the wind tunnel, if radial flow near or in the boundary layer of the airfoil affected pressure distributions, if dynamic stall could result in increased dynamic loads, and if the location of the separation boundary measured on the rotating blade agreed with that measured in two-dimensional flow in the wind tunnel. 6 refs., 9 figs., 1 tab.

Butterfield, C.P.; Nelsen, E.N.

1990-01-01T23:59:59.000Z

293

Cavitation as a complementary tool for automotive aerodynamics J.F. Beaudoin, O. Cadot, J.L. Aider, K. Gosse, P. Paranthoen, B. Hamelin,  

E-Print Network [OSTI]

Cavitation as a complementary tool for automotive aerodynamics J.F. Beaudoin, O. Cadot, J.L. Aider consists in reducing the aerodynamic drag of the vehicles. As a matter of fact, aerodynamic forces play and Sovran 1993; Hucho 1998). Since the pioneering work of Morel (1978) and Ahmed (1983) about aerodynamics

Wesfreid, José Eduardo

294

Mesoscale hybrid calibration artifact  

DOE Patents [OSTI]

A mesoscale calibration artifact, also called a hybrid artifact, suitable for hybrid dimensional measurement and the method for make the artifact. The hybrid artifact has structural characteristics that make it suitable for dimensional measurement in both vision-based systems and touch-probe-based systems. The hybrid artifact employs the intersection of bulk-micromachined planes to fabricate edges that are sharp to the nanometer level and intersecting planes with crystal-lattice-defined angles.

Tran, Hy D. (Albuquerque, NM); Claudet, Andre A. (Albuquerque, NM); Oliver, Andrew D. (Waltham, MA)

2010-09-07T23:59:59.000Z

295

Hybrid armature projectile  

DOE Patents [OSTI]

A projectile for a railgun that uses a hybrid armature and provides a seed block around part of the outer surface of the projectile to seed the hybrid plasma brush. In addition, the hybrid armature is continuously vaporized to replenish plasma in a plasma armature to provide a tandem armature and provides a unique ridge and groove to reduce plasama blowby.

Hawke, Ronald S. (Livermore, CA); Asay, James R. (Los Lunas, NM); Hall, Clint A. (Albuquerque, NM); Konrad, Carl H. (Albuquerque, NM); Sauve, Gerald L. (Berthoud, CO); Shahinpoor, Mohsen (Albuquerque, NM); Susoeff, Allan R. (Pleasanton, CA)

1993-01-01T23:59:59.000Z

296

Hybrid armature projectile  

DOE Patents [OSTI]

A projectile for a railgun that uses a hybrid armature and provides a seed block around part of the outer surface of the projectile to seed the hybrid plasma brush. In addition, the hybrid armature is continuously vaporized to replenish plasma in a plasma armature to provide a tandem armature and provides a unique ridge and groove to reduce plasma blowby.

Hawke, R.S.; Asay, J.R.; Hall, C.A.; Konrad, C.H.; Sauve, G.L.; Shahinpoor, M.; Susoeff, A.R.

1993-03-02T23:59:59.000Z

297

Aerodynamic effects in ink-jet printing on a moving web  

E-Print Network [OSTI]

Hsiao, W.-K., Hoath, S.D., Martin, G.D. and Hutchings, I.M., paper for NIP28 2012, 'Aerodynamic effects in ink-jet printing on a moving web' (accepted) Aerodynamic Effects in Ink-Jet Printing on a Moving Web Wen-Kai Hsiao, Stephen D Hoath... airflow and the wakes from the printed ink drops should be investigated as the primary source of aerodynamically-related print quality issues. Introduction The scope of commercial ink-jet printing has extended significant- ly in recent years. For new...

Hsiao, W.-K.; Hoath, S.D.; Martin, G.D.; Hutchings, I.M.

2012-01-01T23:59:59.000Z

298

Development of a New Flame Speed Vessel to Measure the Effect of Steam Dilution on Laminar Flame Speeds of Syngas Fuel Blends at Elevated Pressures and Temperatures  

E-Print Network [OSTI]

/s to 16.7 cm/s. The amount of carbon monoxide dilution in the fuel was shown to be the most influential factor on the laminar flame speed from fuel lean to fuel rich. This is verified by comparing the laminar flame speed of the atmospheric mixtures. Also...

Krejci, Michael

2012-07-16T23:59:59.000Z

299

MEMBRANELESS FUEL CELL BASED ON LAMINAR FLOW Eric R. Choban, Piotr Waszczuk, Larry J. Markoski, Andrzej Wieckowski, and Paul J.A. Kenis*  

E-Print Network [OSTI]

MEMBRANELESS FUEL CELL BASED ON LAMINAR FLOW Eric R. Choban, Piotr Waszczuk, Larry J. Markoski in this area focus on downscaling of existing fuel cell technology such as the well-known proton exchange membrane (PEM) fuel cells. Here we study a novel concept for fuel cells: the use of laminar flow instead

Kenis, Paul J. A.

300

Characterization of Fuego for laminar and turbulent natural convection heat transfer.  

SciTech Connect (OSTI)

A computational fluid dynamics (CFD) analysis is conducted for internal natural convection heat transfer using the low Mach number code Fuego. The flow conditions under investigation are primarily laminar, transitional, or low-intensity level turbulent flows. In the case of turbulent boundary layers at low-level turbulence or transitional Reynolds numbers, the use of standard wall functions no longer applies, in general, for wall-bounded flows. One must integrate all the way to the wall in order to account for gradients in the dependent variables in the viscous sublayer. Fuego provides two turbulence models in which resolution of the near-wall region is appropriate. These models are the v2-f turbulence model and a Launder-Sharma, low-Reynolds number turbulence model. Two standard geometries are considered: the annulus formed between horizontal concentric cylinders and a square enclosure. Each geometry emphasizes wall shear flow and complexities associated with turbulent or near turbulent boundary layers in contact with a motionless core fluid. Overall, the Fuego simulations for both laminar and turbulent flows compared well to measured data, for both geometries under investigation, and to a widely accepted commercial CFD code (FLUENT).

Francis, Nicholas Donald, Jr. (,; .)

2005-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Response of a laminar premixed flame to flow oscillations: A kinematic model and thermoacoustic instability results  

SciTech Connect (OSTI)

Combustion instability is a resonance phenomenon that arises due to the coupling between the system acoustics and the unsteady heat release. The constructive feedback between the two processes, which is known to occur as a certain phase relationship between the pressure and the unsteady heat release rate is satisfied, depends on many parameters among which is the acoustic mode, the flame holder characteristics, and the dominant burning pattern. In this paper, the authors construct an analytical model to describe the dynamic response of a laminar premixed flame stabilized on the rim of a tube to velocity oscillation. They consider uniform and nonuniform velocity perturbations superimposed on a pipe flow velocity profile. The model results show that the magnitude of heat release perturbation and its phase with respect to the dynamic perturbation dependent primarily on the flame Strohal number, representing the ratio of the dominant frequency times the tube radius to the laminar burning velocity. In terms of this number, high-frequency perturbations pass through the flame while low frequencies lead to a strong response. The phase with respect to the velocity perturbation behaves in the opposite way. Results of this model are shown to agree with experimental observations and to be useful in determining how the combustion excited model is selected among all the acoustic unstable modes. The model is then used to obtain a time-domain differential equation describing the relationship between the velocity perturbation and the heat release response over the entire frequency range.

Fleifil, M.; Annaswamy, A.M.; Ghoneim, A.F. [Massachusetts Inst. of Technology, Cambridge, MA (United States)] [Massachusetts Inst. of Technology, Cambridge, MA (United States); Ghoneim, Z.A. [Ain Shams Univ., Abassia (Egypt)] [Ain Shams Univ., Abassia (Egypt)

1996-09-01T23:59:59.000Z

302

Soot suppression by ferrocene in laminar ethylene/air nonpremixed flames  

SciTech Connect (OSTI)

An experimental investigation is presented on the origin of the soot suppressing role of ferrocene additive in laminar, coannular, ethylene/air nonpremixed flames. The conditions examined involve laminar flames operating above and below their smoke point. In-flame diagnostics are employed to discern the interaction between the soot matrix and additive combustion products. The data presented in a previous study, as produced by thermophoretic sampling, transmission electron microscopy and high-resolution microanalysis techniques, are supplemented by soot volume fraction, temperature, and soot primary size measurements to unravel the mechanisms through which ferrocene combustion products influence soot formation processes. Furthermore, Z-contrast scanning/transmission electron microscopy is used to examine the over-fire aerosol and, in turn, provide insight on the fine-scale dispersion of iron fragments within the carbonaceous soot matrix. It is shown that ferrocene seeding of the fuel stream accelerates the particular inception mechanisms, but does not influence soot loadings when soot growth is dominant. Ferrocene is also found to enhance soot oxidation rates near the flame terminus. It is concluded that the fine-scale incorporation of iron compounds within the soot matrix is a primary factor for the soot suppressing role of ferrocene in nonpremixed flames.

Zhang, J.; Megaridis, C.M. [Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering] [Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering

1996-06-01T23:59:59.000Z

303

Ginzburg--Landau description of laminar-turbulent oblique band formation in transitional plane Couette flow  

E-Print Network [OSTI]

Plane Couette flow, the flow between two parallel planes moving in opposite directions, is an example of wall-bounded flow experiencing a transition to turbulence with an ordered coexistence of turbulent and laminar domains in some range of Reynolds numbers [R_g,R_t]. When the aspect-ratio is sufficiently large, this coexistence occurs in the form of alternately turbulent and laminar oblique bands. As R goes up trough the upper threshold R_t, the bands disappear progressively to leave room to a uniform regime of featureless turbulence. This continuous transition is studied here by means of under-resolved numerical simulations understood as a modelling approach adapted to the long time, large aspect-ratio limit. The state of the system is quantitatively characterised using standard observables (turbulent fraction and turbulence intensity inside the bands). A pair of complex order parameters is defined for the pattern which is further analysed within a standard Ginzburg--Landau formalism. Coefficients of the mo...

Rolland, Joran

2011-01-01T23:59:59.000Z

304

Comparative Study of Hybrid Powertrains on Fuel Saving, Emissions, and Component Energy Loss in HD Trucks  

SciTech Connect (OSTI)

We compared parallel and series hybrid powertrains on fuel economy, component energy loss, and emissions control in Class 8 trucks over both city and highway driving. A comprehensive set of component models describing battery energy, engine fuel efficiency, emissions control, and power demand interactions for heavy duty (HD) hybrids has been integrated with parallel and series hybrid Class 8 trucks in order to identify the technical barriers of these hybrid powertrain technologies. The results show that series hybrid is absolutely negative for fuel economy benefit of long-haul trucks due to an efficiency penalty associated with the dual-step conversions of energy (i.e. mechanical to electric to mechanical). The current parallel hybrid technology combined with 50% auxiliary load reduction could elevate 5-7% fuel economy of long-haul trucks, but a profound improvement of long-haul truck fuel economy requires additional innovative technologies for reducing aerodynamic drag and rolling resistance losses. The simulated emissions control indicates that hybrid trucks reduce more CO and HC emissions than conventional trucks. The simulated results further indicate that the catalyzed DPF played an important role in CO oxidations. Limited NH3 emissions could be slipped from the Urea SCR, but the average NH3 emissions are below 20 ppm. Meanwhile our estimations show 1.5-1.9% of equivalent fuel-cost penalty due to urea consumption in the simulated SCR cases.

Gao, Zhiming [ORNL; FINNEY, Charles E A [ORNL; Daw, C Stuart [ORNL; LaClair, Tim J [ORNL; Smith, David E [ORNL

2014-01-01T23:59:59.000Z

305

Aerodynamics of Two Interfering Simple-Shape Bodies in Hypersonic Rarefied-Gas Flows  

E-Print Network [OSTI]

Aerodynamics of Two Interfering Simple-Shape Bodies in Hypersonic Rarefied-Gas Flows Vladimir V. Riabov Rivier College, Nashua, New Hampshire, USA ABSTRACT Hypersonic rarefied-gas flows near two side of Hypersonic Rarefied Gas Flows n

Riabov, Vladimir V.

306

Influence of low-speed aerodynamic performance on airport community noise  

E-Print Network [OSTI]

Properly assessing proposed aviation policies requires a thorough trade study of noise, emissions, fuel consumption, and cost. Aircraft low-speed aerodynamic performance is an important driver of all these impacts, and ...

March, Andrew I. (Andrew Irving)

2008-01-01T23:59:59.000Z

307

Unsteady Aerodynamic and Dynamic Analysis of the Meridian UAS in a Rolling-Yawing Motion  

E-Print Network [OSTI]

The nonlinear and unsteady aerodynamic effects of operating the Meridian unmanned aerial system (UAS) in crosswinds and at high angular rates is investigated in this work. The Meridian UAS is a large autonomous aircraft, with a V-tail configuration...

Lykins, Ryan

2014-05-31T23:59:59.000Z

308

E-Print Network 3.0 - aerodynamic localizer pal Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

pal Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic localizer pal Page: << < 1 2 3 4 5 > >> 1 J. Phys. III Franc-e 4 (1994) 783-804...

309

An acoustic and aerodynamic study of stops in tonal and non-tonal dialects of Korean  

E-Print Network [OSTI]

ABSTRACT This study investigates the acoustic and aerodynamic properties of well&ndashknown three&ndashway distinction of Korean voiceless stops in two dialects, which differ in their tonal systems: non&ndashtonal Seoul Korean (standard Korean...

Lee, Hyunjung

2010-03-29T23:59:59.000Z

310

E-Print Network 3.0 - aerodynamic surface quantities Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic surface quantities Page: << < 1 2 3 4 5 > >> 1 J. Phys. III Franc-e 4 (1994)...

311

E-Print Network 3.0 - aerodynamic performance prediction Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Search Powered by Explorit Topic List Advanced Search Sample search results for: aerodynamic performance prediction Page: << < 1 2 3 4 5 > >> 1 J. Phys. III Franc-e 4 (1994)...

312

Challenges in Simulation of Aerodynamics, Hydrodynamics, and Mooring-Line Dynamics of Floating Offshore Wind Turbines  

SciTech Connect (OSTI)

This paper presents the current major modeling challenges for floating offshore wind turbine design tools and describes aerodynamic and hydrodynamic effects due to rotor and platform motions and usage of non-slender support structures.

Matha, D.; Schlipf, M.; Cordle, A.; Pereira, R.; Jonkman, J.

2011-10-01T23:59:59.000Z

313

Effect of aerodynamic uncertainties on unconventional lateral control at high angle of attack  

E-Print Network [OSTI]

EFFECT OF AERODYNAMIC UNCERTAINTIES ON UNCONVENTIONAL LATERAL CONTROL AT HIGH ANGLE OF ATTACK A Thesis by BOB GENSEN ELLER Submitted to the Graduate College of Texas ARM University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1987 Major Subject: Aerospace Engineering EFFECT OF AERODYNAMIC UNCERTAINTIES ON UNCONVENTIONAL LATEHAI CONTROL AT HIGH ANGI. E (&F A'I'TACK A Thesis by BOB GENSEN ELLER Approved as to style and content by: Donald T...

Eller, Bob Gensen

1987-01-01T23:59:59.000Z

314

An aerodynamic surface to deploy and position a stall deterrent spoiler  

E-Print Network [OSTI]

AN AERODYNAMIC SURFACE TO DEPLOY AND POSITION A STALL DETERRENT SPOILER A Thesis JEFFREY REED BROWN Submitted to the Graduate College of Texas A8M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE... December 1974 Major Subject: Aerospace Engineering AN AERODYNAMIC SURFACE TO DEPLOY AND POSITION A STALL DETERRENT SPOILER A Thesis by JEFFREY REED BROWN Approved as to style and content by: Chairman of Committee Head o Departm nt Member Member...

Brown, Jeffrey Reed

1974-01-01T23:59:59.000Z

315

Computer subroutine for estimating aerodynamic blade loads on Darrieus vertical axis wind turbines. [FORCE code  

SciTech Connect (OSTI)

An important aspect of structural design of the Darrieus rotor is the determination of aerodynamic blade loads. This report describes a load generator which has been used at Sandia for quasi-static and dynamic rotor analyses. The generator is based on the single streamtube aerodynamic flow model and is constructed as a FORTRAN IV subroutine to facilitate its use in finite element structural models. Input and output characteristics of the subroutine are described and a complete listing is attached as an appendix.

Sullivan, W. N.; Leonard, T. M.

1980-11-01T23:59:59.000Z

316

How to improve open rotor aerodynamics at cruise and take-off  

E-Print Network [OSTI]

1 Copyright 2014 University of Cambridge DRAFT HOW TO IMPROVE OPEN ROTOR AERODYNAMICS AT CRUISE AND TAKE-OFF Cesare Hall, Alexios Zachariadis, Tobias Brandvik, Nishad Sohoni cah1003@cam.ac.uk University of Cambridge, Whittle... Laboratory 1 JJ Thomson Avenue, Cambridge CB3 0DY ABSTRACT A key challenge in open rotor design is getting the optimum aerodynamics at both the cruise and take-off conditions. This is particularly difficult because the operation and the requirements...

Hall, Cesare; Zachariadis, Alexios; Brandvik, Tobias; Sohoni, Nishad

317

Towards a Hybrid Dynamic Logic for Hybrid Dynamic Systems1  

E-Print Network [OSTI]

HyLo 2006 Towards a Hybrid Dynamic Logic for Hybrid Dynamic Systems1 Andr´e Platzer2 Carnegie platzer@informatik.uni-oldenburg.de Abstract We introduce a hybrid variant of a dynamic logic for this extended hybrid dynamic logic. With the addition of satisfaction operators, this hybrid logic provides

Platzer, André

318

Membraneless Vanadium Redox Fuel Cell Using Laminar Flow Rosaria Ferrigno, Abraham D. Stroock, Thomas D. Clark, Michael Mayer, and  

E-Print Network [OSTI]

Membraneless Vanadium Redox Fuel Cell Using Laminar Flow Rosaria Ferrigno, Abraham D. Stroock This communication describes a small redox fuel cell fabricated using a design that omits the membrane normally used this concept by operating a millimeter-scale redox fuel cell that uses the redox couples V(V)/V(IV) (cathodic

Prentiss, Mara

319

A New Type of Steady and Stable, Laminar, Premixed Flame in Ultra-Lean, Hydrogen-Air Combustion  

E-Print Network [OSTI]

A New Type of Steady and Stable, Laminar, Premixed Flame in Ultra-Lean, Hydrogen-Air Combustion in the development of combustion science. Several aspects of these two-dimensional flame cells are identified for premixed combustion when the other types of idealized flames are inapplicable. 1 #12;Nomenclature fuel

Geddes, Cameron Guy Robinson

320

Experimental investigation of sound generation by a protuberance in a laminar boundary layer  

SciTech Connect (OSTI)

Sound radiation from a two-dimensional protuberance glued on the wall in a laminar boundary layer was investigated experimentally at low Mach numbers. When the protuberance was as high as the boundary-layer thickness, a feedback-loop mechanism set in between protuberance-generated sound and Tollmien-Schlichting (T-S) waves generated by the leading-edge receptivity to the upstream-propagating sound. Although occurrence of a separation bubble immediately upstream of the protuberance played important roles in the evolution of instability waves into vortices interacting with the protuberance, the frequency of tonal vortex sound was determined by the selective amplification of T-S waves in the linear instability stage upstream of the separation bubble and was not affected by the instability of the separation bubble.

Kobayashi, M.; Asai, M.; Inasawa, A. [Department of Aerospace Engineering, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065 (Japan)

2014-08-15T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Soot microstructure in steady and flickering laminar methane/air diffusion flames  

SciTech Connect (OSTI)

An experimental investigation is presented to identify the mechanisms responsible for the enhanced sooting behavior of strongly flickering methane/air jet diffusion flames when compared to their steady counterparts. The work extends the implementation of thermophoretic sampling in flickering, co-flow, laminar, diffusion flames. Acoustic forcing of the fuel flow rate is used to phase lock the periodic flame flicker close to the natural flicker frequency ({approximately} 10 Hz for a burner diameter of {approximately} 1 cm). Soot primary sizes, determined as functions of flame coordinates, indicate that the largest soot primary units in strongly flickering methane/air flames are larger by {approximately} 60% than those measured in steady flames with the same mean reactant flow rates. The primary particle size measurements, when combined with the soot volume fractions reported by other investigators, indicate that soot surface areas in the flickering flame are three to four times larger than those under steady conditions. These results, along with the fact that residence times in the flickering flame are twice as long as those in the steady flame, suggest that specific soot surface growth rates under unsteady combustion conditions can be similar or even lower than those in the corresponding steady flames. Finally, the number of densities of soot primaries in flickering flames are found to be higher by 30--50% than those in steady flames, thus suggesting stronger and/or extended soot inception mechanisms under flickering conditions. The combination of longer flow residence times and greater population of incipient soot particles in flickering flames appears to be primarily responsible for the higher sooting propensity of methane under laminar unsteady combustion conditions.

Zhang, J.; Megaridis, C.M. [Univ. of Illinois, Chicago, IL (United States). Dept. of Mechanical Engineering

1998-03-01T23:59:59.000Z

322

The use of particle tracking to obtain planar velocity measurements in an unsteady laminar diffusion flame  

SciTech Connect (OSTI)

An investigation of the flame-flow interaction in an unsteady laminar co-flowing jet diffusion flame is underway. The flame is made periodic by acoustic excitation of the fuel stream. The objective of the research is to develop a better understanding of the relationship between the flowfield and combustion process by superimposing measurements of the vector velocity field on planar measurements of reactive and passive scalars. In this connection a technique is being developed to obtain instantaneous two-dimensional velocity measurements from multiply-exposed photographic images of scattered light from speed particles in the flow. The technique involves simple photographic images taken at a right angle to a thin laser sheet on the diametric center of the jet. The illumination source is pulsed Cu vapor laser. The important issues considered have included the particle type and size as they relate to the particle's ability to follow the flow and to withstand combustion temperatures. Also of concern is the effect of thermophoretic forces on the measurement accuracy. Both Al/sub 2/O/sub 3/ and TiO/sub 2/ have been used successfully and detailed information about the size and geometry of TiO/sub 2/ particles has been obtained through scanning electron microscope photographs. The TiO/sub 2/ particles have been produced from the reaction of TiCl/sub 4/ and water. The technique has been successfully demonstrated by measuring a cold laminar jet exit velocity profile. Also, good particle images have been obtained in a pulsed diffusion flame.

Lewis, G.S.; Cantwell, B.J.; Lecuona, A.

1987-01-01T23:59:59.000Z

323

Corn Hybrids for Texas.  

E-Print Network [OSTI]

Stephenville ,J* 5.K'rbyvilb I0.Cbrkdb 15.Tanpk 2ODetiion 25.Wllothe TEXAS AGRICULTURAL EXPERIMENT STATION R. D. LEWIS. DIRECTOR, COLLEGE STATION, TEXAS DIGEST The Texas corn acreage planted to hybrids increased from less than 1 percent of the total acrea....1 in 1941 to 74.5 percent in 1953. Most of the present acreage is devoted to the newer, better-adaptt hybrids-Texas 26, 28 and 30. These new hybrids usually outyield the older Texas hybrids h!. least 10 percent. Corn is one of the most important...

Rogers, J. S.; McAfee, T. E.

1954-01-01T23:59:59.000Z

324

Analysis of data from electric and hybrid electric vehicle student competitions  

SciTech Connect (OSTI)

The US Department of Energy sponsored several student engineering competitions in 1993 that provided useful information on electric and hybrid electric vehicles. The electrical energy usage from these competitions has been recorded with a custom-built digital meter installed in every vehicle and used under controlled conditions. When combined with other factors, such as vehicle mass, speed, distance traveled, battery type, and type of components, this information provides useful insight into the performance characteristics of electrics and hybrids. All the vehicles tested were either electric vehicles or hybrid vehicles in electric-only mode, and had an average energy economy of 7.0 km/kwh. Based on the performance of the ``ground-up`` hybrid electric vehicles in the 1993 Hybrid Electric Vehicle Challenge, data revealed a I km/kwh energy economy benefit for every 133 kg decrease in vehicle mass. By running all the electric vehicles at a competition in Atlanta at several different constant speeds, the effects of rolling resistance and aerodynamic drag were evaluated. On average, these vehicles were 32% more energy efficient at 40 km/h than at 72 km/h. The results of the competition data analysis confirm that these engineering competitions not only provide an educational experience for the students, but also show technology performance and improvements in electric and hybrid vehicles by setting benchmarks and revealing trends.

Wipke, K.B. [National Renewable Energy Lab., Golden, CO (United States); Hill, N.; Larsen, R.P. [Argonne National Lab., IL (United States)

1994-01-01T23:59:59.000Z

325

Formula Hybrid International Competition  

E-Print Network [OSTI]

, and computerized control systems. But the greatest obstacle of all was that hybrid cars could not meet newlyFormula Hybrid International Competition May 4, 5, 6, 2009 #12;09 annual third We are thrilled to have 30 cars competing this year. The competition is the result of the hard work of many people

Carver, Jeffrey C.

326

AIAA Applied Aerodynamics Conference, 7th, Seattle, WA, July 31-Aug. 2, 1989, Technical Papers  

SciTech Connect (OSTI)

The present conference discusses the comparative aerodynamic behavior of half-span and full-span delta wings, TRANAIR applications to engine/airframe integration, a zonal approach to V/STOL vehicle aerodynamics, an aerodynamic analysis of segmented aircraft configurations in high-speed flight, unstructured grid generation and FEM flow solvers, surface grid generation for flowfields using B-spline surfaces, the use of chimera in supersonic viscous calculations for the F-15, and hypersonic vehicle forebody design studies. Also discussed are the aerothermodynamics of projectiles at hypersonic speeds, flow visualization of wing-rock motion in delta wings, vortex interaction over delta wings at high alpha, the analysis and design of dual-rotation propellers, unsteady pressure loads from plunging airfoils, the effects of riblets on the wake of an airfoil, inverse airfoil design with Navier-Stokes methods, flight testing for a 155-mm base-burn projectile, experimental results on rotor/fuselage aerodynamic interactions, the high-alpha aerodynamic characteristics of crescent and elliptic wings, and the effects of free vortices on lifting surfaces.

Not Available

1989-01-01T23:59:59.000Z

327

Hybrid Quantum Cloning Machine  

E-Print Network [OSTI]

In this work, we introduce a special kind of quantum cloning machine called Hybrid quantum cloning machine. The introduced Hybrid quantum cloning machine or transformation is nothing but a combination of pre-existing quantum cloning transformations. In this sense it creates its own identity in the field of quantum cloners. Hybrid quantum cloning machine can be of two types: (i) State dependent and (ii) State independent or Universal. We study here the above two types of Hybrid quantum cloning machines. Later we will show that the state dependent hybrid quantum-cloning machine can be applied on only four input states. We will also find in this paper another asymmetric universal quantum cloning machine constructed from the combination of optimal universal B-H quantum cloning machine and universal anti-cloning machine. The fidelities of the two outputs are different and their values lie in the neighborhood of ${5/6} $

Satyabrata Adhikari; A. K. Pati; Indranil Chakrabarty; B. S. Choudhury

2007-05-04T23:59:59.000Z

328

Hybrid Automata-based CEGAR for Rectangular Hybrid Systems  

E-Print Network [OSTI]

Hybrid Automata-based CEGAR for Rectangular Hybrid Systems Pavithra Prabhakar, Sridhar Duggirala- example guided abstraction-refinement (CEGAR) for systems modelled as rectangular hybrid automata. The main difference, between our ap- proach and previous proposals for CEGAR for hybrid automata

Liberzon, Daniel

329

PDF Approach Hybrid Methodology Validation DEVELOPMENT OF A HYBRID  

E-Print Network [OSTI]

PDF Approach Hybrid Methodology Validation DEVELOPMENT OF A HYBRID EULERIAN-LAGRANGIAN METHOD CNRS / INPT / UPS PhD Defense X. PIALAT Hybrid Eulerian-Lagrangian Method (HELM) #12;PDF Approach Hybrid Methodology Validation Introduction Gas-Particle Flows Applications pollutant dispersion

Paris-Sud XI, Université de

330

Hybrid Systems State estimation for hybrid systems: applications  

E-Print Network [OSTI]

Hybrid Systems State estimation for hybrid systems: applications to aircraft tracking I. Hwang, H of a stochastic linear hybrid system, given only the continuous system output data, is studied. Well established techniques for hybrid estimation, known as the multiple model adaptive estimation algorithm

Tomlin, Claire

331

HYBRID LIMIT CYCLES AND HYBRID POINCARE-BENDIXSON  

E-Print Network [OSTI]

HYBRID LIMIT CYCLES AND HYBRID POINCAR´E-BENDIXSON Slobodan N. Simi´c Department of Electrical regular hybrid systems with no branching (Simi´c et al., 2000a). The first one provides a condition for asymptotic stability of hybrid closed orbits in terms of contraction-expansion rates of resets and flows

Johansson, Karl Henrik

332

The Formation of Systems with Tightly-packed Inner Planets (STIPs) via Aerodynamic Drift  

E-Print Network [OSTI]

The NASA Kepler mission has revealed an abundant class of Systems with Tightly-packed Inner Planets (STIPs). The current paradigm for planet formation suggests that small planetesimals will quickly spiral into the host star due to aerodynamic drag, preventing rocky planet formation. In contrast, we find that aerodynamic drift, when acting on an ensemble of solids, can concentrate mass at short orbital periods in gaseous disks. Sublimation fronts may further aid this process. Kepler data suggest that the innermost known planets are found near the silicate sublimation zone. STIP planets should have a wide range of volatile fractions due to aerodynamic drift and H2 dissociation-driven gas accretion. We further propose that the low mass of Mars is evidence that the Solar System was once a proto-STIP.

Boley, Aaron C

2013-01-01T23:59:59.000Z

333

Developing Supersonic Impactor and Aerodynamic Lens for Separation and Handling of Nano-Sized Particles  

SciTech Connect (OSTI)

A computational model for supersonic flows of compressible gases in an aerodynamic lens with several lenses and in a supersonic/hypersonic impactor was developed. Airflow conditions in the aerodynamic lens were analyzed and contour plots for variation of Mach number, velocity magnitude and pressure field in the lens were evaluated. The nano and micro-particle trajectories in the lens and their focusing and transmission efficiencies were evaluated. The computational model was then applied to design of a aerodynamic lens that could generate focus particle beams while operating under atmospheric conditions. The computational model was also applied to airflow condition in the supersonic/hypersonic impactor. Variations of airflow condition and particle trajectories in the impactor were evaluated. The simulation results could provide understanding of the performance of the supersonic and hypersonic impactors that would be helpful for the design of such systems.

Goodarz Ahmadi

2008-06-30T23:59:59.000Z

334

Numerical analysis of laminar fluid flow and heat transfer in a parallel plate channel with normally in-line positioned plates  

E-Print Network [OSTI]

NUMERICAL ANALYSIS OF LAMINAR FLUID FLOW AND HEAT TRANSFER IN A PARALLEL PLATE CHANNEL WITH NORMALLY IN-LINE POSITIONED PLATES A Thesis by JOHN GRADY iVICMATH Submitted to the Office of Graduate Studies of Texas AkM University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1991 Major Subject: Mechanical Engineering NUMERICAL ANALYSIS OF LAMINAR FLUID FLOW AND HEAT TRANSFER IN A PARALLEL PLATE CHANNEI WITH NORMALLY IN-LINE POSITIONED PLATES A...

McMath, John Grady

2012-06-07T23:59:59.000Z

335

APIC'95, El Paso, Extended Abstracts, A Supplement to the international journal of Reliable Computing 1 Aerodynamic Aids to Vehicle Stability  

E-Print Network [OSTI]

Computing 1 Aerodynamic Aids to Vehicle Stability R. Bell Abstract--- Modern race cars utilize vari­ ous aerodynamic devices to increase stability, and traction. There is a considerable body of information available

Kreinovich, Vladik

336

Physical characterization of laminar spray flames in the pressure range 0.1-0.9 MPa  

SciTech Connect (OSTI)

An experimental study is reported on the physical characterization of the structure of ethanol/argon/oxygen coflow laminar spray diffusion flames in the pressure range 0.1-0.9 MPa. Diagnostic techniques include phase Doppler anemometry to measure the droplet size distribution and the axial and radial velocity components of the droplets. The gas-phase velocity is determined using measurements from the smallest (low Stokes number) droplets and is corrected for thermophoretic effects. Temperature information is obtained using thin-film pyrometry combined with an infrared camera. All flames present a cold inner core, in which little or no vaporization takes place, surrounded by an envelope flame buried in a thermal boundary layer, where most of the droplet evaporation occurs. The thickness of this thermal boundary layer scales with the inverse of the Peclet number. Especially near the base of the flame, photographic evidence of streaks, which in some case even reveal the presence of soot, suggests that some droplets survive the common envelope flame and burn isolated on the oxidizer side in a mixed regime of internal/external group combustion. The reconstruction of the entire droplet vaporization history confirms this evidence quantitatively. A criterion for droplet survival beyond the envelope flame based on the critical value of a suitably defined vaporization Damkohler number is proposed. The scaling and self-similar behavior of the investigated flames suggest that a mixed regime is established, with a momentum-controlled cold core and a buoyancy-controlled high-temperature boundary layer, the thickness of which varies significantly with pressure, as expected from Peclet number scaling. The growth of this layer and the thickness of the vaporization region are reduced at pressures above atmospheric because of density effects on thermal diffusivity. Some aspects of the design of the combustion chamber and of the atomizer system are discussed in detail since they are critical to the suppression of instabilities and to the establishment of a well-defined high-pressure quasi-steady laminar environment. (author)

Russo, Stefano; Gomez, Alessandro [Yale Center for Combustion Studies, Department of Mechanical Engineering, Yale University, P.O. Box 208286, New Haven, CT 06520-8286 (United States)

2006-04-15T23:59:59.000Z

337

AIAA Applied Aerodynamics Conference, 10th, Palo Alto, CA, June 22-24, 1992, Technical Papers. Pts. 1 AND 2  

SciTech Connect (OSTI)

Consideration is given to vortex physics and aerodynamics; supersonic/hypersonic aerodynamics; STOL/VSTOL/rotors; missile and reentry vehicle aerodynamics; CFD as applied to aircraft; unsteady aerodynamics; supersonic/hypersonic aerodynamics; low-speed/high-lift aerodynamics; airfoil/wing aerodynamics; measurement techniques; CFD-solvers/unstructured grid; airfoil/drag prediction; high angle-of-attack aerodynamics; and CFD grid methods. Particular attention is given to transonic-numerical investigation into high-angle-of-attack leading-edge vortex flow, prediction of rotor unsteady airloads using vortex filament theory, rapid synthesis for evaluating the missile maneuverability parameters, transonic calculations of wing/bodies with deflected control surfaces; the static and dynamic flow field development about a porous suction surface wing; the aircraft spoiler effects under wind shear; multipoint inverse design of an infinite cascade of airfoils, turbulence modeling for impinging jet flows; numerical investigation of tail buffet on the F-18 aircraft; the surface grid generation in a parameter space; and the flip flop nozzle extended to supersonic flows.

Not Available

1992-01-01T23:59:59.000Z

338

Missile aerodynamics; Proceedings of the Conference, Monterey, CA, Oct. 31-Nov. 2, 1988  

SciTech Connect (OSTI)

The present conference discusses the development status of predictive capabilities for missile aerodynamic characteristics, the application of experimental techniques to missile-release problems, prospective high-performance missile designs, the use of lateral jet controls for missile guidance, and the integration of stores on modern tactical aircraft. Also discussed are semiempirical aerodynamic methods for preliminary design, high angle-of-attack behavior for an advanced missile, and the dynamic derivatives of missiles and fighter-type configurations at high angles-of-attack.

Mendenhall, M.R.; Nixon, D.; Dillenius, M.F.E.

1989-01-01T23:59:59.000Z

339

Hybrid matrix fiber composites  

DOE Patents [OSTI]

Hybrid matrix fiber composites having enhanced compressive performance as well as enhanced stiffness, toughness and durability suitable for compression-critical applications. The methods for producing the fiber composites using matrix hybridization. The hybrid matrix fiber composites include two chemically or physically bonded matrix materials, whereas the first matrix materials are used to impregnate multi-filament fibers formed into ribbons and the second matrix material is placed around and between the fiber ribbons that are impregnated with the first matrix material and both matrix materials are cured and solidified.

Deteresa, Steven J.; Lyon, Richard E.; Groves, Scott E.

2003-07-15T23:59:59.000Z

340

Simultaneous heat and mass transfer in absorption of gases in laminar liquid films  

SciTech Connect (OSTI)

A theoretical analysis of the combined heat and mass transfer process taking place in the absorption of a gas or vapor into a laminar liquid film is described. This type of process, which occurs in many gas-liquid systems, often releases only a small amount of heat, making the process almost isothermal. In some cases, however, the heat of absorption is significant and temperature variations cannot be ignored. One example, from which the present study originated, is in absorption heat pumps where mass transfer is produced specifically to generate a temperature change. The model analyzed describes a liquid film that flows over an inclined plane and has its free surface in contact with stagnant vapor. The absorption process at the surface creates nonuniform temperature and concentration profiles in the film, which develop until equilibrium between the liquid and vapor is achieved. The energy and diffusion equations are solved simultaneously to give the temperature and concentration variations at the interface and the wall. Two cases of interest are considered: constant-temperature and adiabatic walls. The Nusselt and Sherwood numbers are expressed in terms of the operating parameters, from which heat and mass transfer coefficients can be determined. The Nusselt and Sherwood numbers are found to depend on the Peclet and Lewis numbers as well as on the equilibrium characteristics of the working materials.

Grossman, G

1982-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Optical determination of incipient soot particle concentrations in ethene laminar diffusion flames.  

SciTech Connect (OSTI)

Recent studies in premixed flames have shown the existence of ''transparent particles.'' These particles, 2 nm in size and in high number densities are considered to be a phase transitional between the gas phase PAH species and particulate soot. In the present study, various optical diagnostics were evaluated for measuring the concentration of these particles in situ, Through such evaluations, a technique using extinction at two wavelengths was found to be ideal. While employing such a technique, the volume fractions of these particles in an ethene laminar diffusion flame were measured. Low in the flame, these particles were found to be concentrated in the fuel rich core, while at higher locations, they could be found with appreciable volume fractions even in the soot laden regions. Having given due consideration for the errors due to uncertainties in the optical constants, we report the existence of these particles in an ethene flame with volume fractions comparable to those of soot. Also, similar measurements performed in a low sooting ethene/methanol flame show the concentration of these particles to be of the same order of magnitude as in a pure ethene flame.

Gupta, S. B.; Santoro, R. J.

1999-07-06T23:59:59.000Z

342

Effects of multi-component diffusion and heat release on laminar diffusion flame liftoff  

SciTech Connect (OSTI)

Numerical simulations were conducted of the liftoff and stabilization phenomena of laminar jet diffusion flames of inert-diluted C{sub 3}H{sub 8} and CH{sub 4} fuels. Both non-reacting and reacting jets were investigated, including multi-component diffusivities and heat release effects (buoyancy and gas expansion). The role of Schmidt number for non-reacting jets was investigated, with no conclusive Schmidt number criterion for liftoff previously arrived at in similarity solutions. The cold-flow simulation for He-diluted CH{sub 4} fuel does not predict flame liftoff; however, adding heat release reaction lead to the prediction of liftoff, which is consistent with experimental observations. Including reaction was also found to improve liftoff height prediction for C{sub 3}H{sub 8} flames, with the flame base location differing from that in the similarity solution - the intersection of the stoichiometric and iso-velocity (equal to 1-D flame speed) is not necessary for flame stabilization (and thus liftoff). Possible mechanisms other than that proposed for similarity solution may better help to explain the stabilization and liftoff phenomena. (author)

Li, Zhiliang; Chen, Ruey-Hung [Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450 (United States); Phuoc, Tran X. [National Energy Technology Laboratory, Department of Energy, P.O. Box 10940, MS 84-340, Pittsburgh, PA 15261 (United States)

2010-08-15T23:59:59.000Z

343

Effect of a uniform electric field on soot in laminar premixed ethylene/air flames  

SciTech Connect (OSTI)

The effect of a nominally uniform electric field on the initially uniform distribution of soot has been assessed for laminar premixed ethylene/air flames from a McKenna burner. An electrophoretic influence on charged soot particles was measured through changes to the deposition rate of soot on the McKenna plug, using laser extinction (LE). Soot volume fraction was measured in situ using laser-induced incandescence (LII). Particle size and morphologies were assessed through ex situ transmission electron microscopy (TEM) using thermophoretic sampling particle diagnostics (TSPD). The results show that the majority of these soot particles are positively charged. The presence of a negatively charged plug was found to decrease the particle residence times in the flame and to influence the formation and oxidation progress. A positively charged plug has the opposite effect. The effect on soot volume fraction, particles size and morphology with electric field strength is also reported. Flame stability was also found to be affected by the presence of the electric field, with the balance of the electrophoretic force and drag force controlling the transition to unstable flame flicker. The presence of charged species generated by the flame was found to reduce the dielectric field strength to one seventh that of air. (author)

Wang, Y.; Yao, Q. [Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, 100084 Beijing (China); Nathan, G.J. [School of Mechanical Engineering, Centre for Energy Technology, The University of Adelaide, S.A. 5005 (Australia); Alwahabi, Z.T.; King, K.D.; Ho, K. [School of Chemical Engineering, Centre for Energy Technology, The University of Adelaide, S.A. 5005 (Australia)

2010-07-15T23:59:59.000Z

344

Electric fields effect on liftoff and blowoff of nonpremixed laminar jet flames in a coflow  

SciTech Connect (OSTI)

The stabilization characteristics of liftoff and blowoff in nonpremixed laminar jet flames in a coflow have been investigated experimentally for propane fuel by applying AC and DC electric fields to the fuel nozzle with a single-electrode configuration. The liftoff and blowoff velocities have been measured by varying the applied voltage and frequency of AC and the voltage and the polarity of DC. The result showed that the AC electric fields extended the stabilization regime of nozzle-attached flame in terms of jet velocity. As the applied AC voltage increased, the nozzle-attached flame was maintained even over the blowout velocity without having electric fields. In such a case, a blowoff occurred directly without experiencing a lifted flame. While for the DC cases, the influence on liftoff was minimal. There existed three different regimes depending on the applied AC voltage. In the low voltage regime, the nozzle-detachment velocity of either liftoff or blowoff increased linearly with the applied voltage, while nonlinearly with the AC frequency. In the intermediate voltage regime, the detachment velocity decreased with the applied voltage and reasonably independent of the AC frequency. At the high voltage regime, the detachment was significantly influenced by the generation of discharges. (author)

Kim, M.K.; Ryu, S.K.; Won, S.H. [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742 (Korea); Chung, S.H. [Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal (Saudi Arabia)

2010-01-15T23:59:59.000Z

345

Autoignited laminar lifted flames of propane in coflow jets with tribrachial edge and mild combustion  

SciTech Connect (OSTI)

Characteristics of laminar lifted flames have been investigated experimentally by varying the initial temperature of coflow air over 800 K in the non-premixed jets of propane diluted with nitrogen. The result showed that the lifted flame with the initial temperature below 860 K maintained the typical tribrachial structure at the leading edge, which was stabilized by the balance mechanism between the propagation speed of tribrachial flame and the local flow velocity. For the temperature above 860 K, the flame was autoignited without having any external ignition source. The autoignited lifted flames were categorized in two regimes. In the case with tribrachial edge structure, the liftoff height increased nonlinearly with jet velocity. Especially, for the critical condition near blowout, the lifted flame showed a repetitive behavior of extinction and reignition. In such a case, the autoignition was controlled by the non-adiabatic ignition delay time considering heat loss such that the autoignition height was correlated with the square of the adiabatic ignition delay time. In the case with mild combustion regime at excessively diluted conditions, the liftoff height increased linearly with jet velocity and was correlated well with the square of the adiabatic ignition delay time. (author)

Choi, B.C.; Kim, K.N.; Chung, S.H. [School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744 (Korea)

2009-02-15T23:59:59.000Z

346

To cite this document: Bechet, S. and Negulescu, C. and Chapin, Vincent and Simon, Frank Integration of CFD tools in aerodynamic design of contra-rotating  

E-Print Network [OSTI]

Integration of CFD tools in aerodynamic design of contra-rotating propellers blades. (2011) In: 3rd CEAS concerns. After a Integration of CFD Tools in Aerodynamic Design of Contra-Rotating Propeller Blades S. Béchet and C. A. Negulescu Airbus Operations S.A.S. - Aerodynamics Department, Toulouse, France V. Chapin

Mailhes, Corinne

347

Journal of Wind Engineering and Industrial Aerodynamics, 36 (1990) 1-15 1 ElsevierSciencePublishersB.V.,Amsterdam--Printed in The Netherlands  

E-Print Network [OSTI]

Journal of Wind Engineering and Industrial Aerodynamics, 36 (1990) 1-15 1 Elsevier the following topics: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Theme Lectures BluffBody Aerodynamics of Notre Dame, Notre Dame, Indiana 46556-0767; formerly, Professor and Director, Structural Aerodynamics

Kareem, Ahsan

348

Hybrid adsorptive membrane reactor  

DOE Patents [OSTI]

A hybrid adsorbent-membrane reactor in which the chemical reaction, membrane separation, and product adsorption are coupled. Also disclosed are a dual-reactor apparatus and a process using the reactor or the apparatus.

Tsotsis, Theodore T. (Huntington Beach, CA); Sahimi, Muhammad (Altadena, CA); Fayyaz-Najafi, Babak (Richmond, CA); Harale, Aadesh (Los Angeles, CA); Park, Byoung-Gi (Yeosu, KR); Liu, Paul K. T. (Lafayette Hill, PA)

2011-03-01T23:59:59.000Z

349

Heavy Hybrid mesons Masses  

E-Print Network [OSTI]

We estimate the ground state masses of the heavy hybrid mesons using a phenomenological QCD-type potential. 0^{- -},1^{- -},0^{- +},1^{- +} and 0^{+ -} J^{PC} states are considered.

F. Iddir; L. Semlala

2006-11-13T23:59:59.000Z

350

A hybrid vehicle evaluation code and its application to vehicle design  

SciTech Connect (OSTI)

This report describes a hybrid vehicle simulation model, which can be applied to many of the vehicles currently being considered for low pollution and high fuel economy. The code operates interactively, with all the vehicle information stored in data files. The code calculates fuel economy for three driving schedules, time for 0-96 km/h at maximum acceleration, hill climbing performance, power train dimensions, and pollution generation rates. This report also documents the application of the code to a hybrid vehicle that operates with a hydrogen internal combustion engine. The simulation model is used for parametric studies of the vehicle. The results show the fuel economy of the vehicle as a function of vehicle mass, aerodynamic drag, engine-generator efficiency, flywheel efficiency, and flywheel energy and power capacities.

Aceves, S.M.; Smith, J.R.

1994-07-15T23:59:59.000Z

351

Human hybrid hybridoma  

SciTech Connect (OSTI)

Hybrid hybridomas are obtained by fusion of two cells, each producing its own antibody. Several authors have reported the construction of murine hybrid hybridomas with the aim to obtain bispecific monoclonal antibodies. The authors have investigated, in a model system, the feasibility of constructing a human hybrid hybridoma. They fused two monoclonal cell lines: an ouabain-sensitive and azaserine/hypoxanthine-resistant Epstein-Barr virus-transformed human cell line that produces an IgG1kappa antibody directed against tetanus toxiod and an azaserine/hypoxanthine-sensitive and ouabain-resistant human-mouse xenohybrid cell line that produces a human IgG1lambda antibody directed against hepatitis-B surface antigen. Hybrid hybridoma cells were selected in culture medium containing azaserine/hypoxanthine and ouabain. The hybrid nature of the secreted antibodies was analyzed by means of two antigen-specific immunoassay. The results show that it is possible, with the combined use of transformation and xenohybridization techniques, to construct human hybrid hybridomas that produce bispecific antibodies. Bispecific antibodies activity was measured by means of two radioimmunoassays.

Tiebout, R.F.; van Boxtel-Oosterhof, F.; Stricker, E.A.M.; Zeijlemaker, W.P.

1987-11-15T23:59:59.000Z

352

A New Aerodynamic Traction Principle for Handling Products on an Air Cushion  

E-Print Network [OSTI]

1 A New Aerodynamic Traction Principle for Handling Products on an Air Cushion Guillaume J. Laurent. The product is carried on a thin air cushion and transported along the system by induced air flows principle for handling delicate and clean products, such as silicon wafers, glass sheets or flat foodstuff

Paris-Sud XI, Université de

353

AIAA 2002-3298 AERODYNAMICS OF TWO SIDE-BY-SIDE PLATES IN HYPERSONIC  

E-Print Network [OSTI]

AIAA 2002-3298 AERODYNAMICS OF TWO SIDE-BY-SIDE PLATES IN HYPERSONIC RAREFIED-GAS FLOWS Vladimir V. Riabov* Rivier College, Nashua, New Hampshire 03060 Abstract Hypersonic rarefied-gas flows near two side have provided valuable information related to physics of hypersonic flows about spacecraft elements

Riabov, Vladimir V.

354

Benchmark of aerodynamic cycling helmets using a refined wind tunnel test protocol for helmet drag research  

E-Print Network [OSTI]

The study of aerodynamics is very important in the world of cycling. Wind tunnel research is conducted on most of the equipment that is used by a rider and is a critical factor in the advancement of the sport. However, to ...

Sidelko, Stephanie

2007-01-01T23:59:59.000Z

355

Fan Aerodynamic Performance Guarantees: Do Your Policies, Procedures and Penalties Provide Adequate Certainty?  

E-Print Network [OSTI]

With few exceptions, fan vendors do not provide a written guarantee regarding aerodynamic performance. Some fan vendors even go so far as to state in their terms and conditions of sale that fan performance is not guaranteed unless it is specifically...

Kaufman, S. G.; Martin, V.; Falk, M. A.

2004-01-01T23:59:59.000Z

356

Aerodynamic and Performance Measurements on a SWT-2.3-101 Wind Turbine  

SciTech Connect (OSTI)

This paper provides an overview of a detailed wind turbine field experiment being conducted at NREL under U.S. Department of Energy sponsorship. The purpose of the experiment is to obtain knowledge about the aerodynamics, performance, noise emission and structural characteristics of the Siemens SWT-2.3-101 wind turbine.

Medina, P.; Singh, M.; Johansen, J.; Jove, A.R.; Machefaux, E.; Fingersh, L. J.; Schreck, S.

2011-10-01T23:59:59.000Z

357

Estimation of unsteady aerodynamics in the wake of a freely flying European starling  

E-Print Network [OSTI]

Wing flapping is one of the most widespread propulsion methods found in nature; however, the current understanding of the aerodynamics in bird wakes is incomplete. The role of the unsteady motion in the flow and its contribution to the aerodynamics is still an open question. In the current study, the wake of a freely flying European starling has been investigated using long-duration high-speed Particle Image Velocimetry (PIV) in the near wake. Kinematic analysis of the wings and body of the bird has been performed using additional high-speed cameras that recorded the bird movement simultaneously with the PIV measurements. The wake evolution of four complete wingbeats has been characterized through reconstruction of the time resolved data, and the aerodynamics in the wake have been analyzed in terms of the streamwise forces acting on the bird. The profile drag from classical aerodynamics was found to be positive during most of the wingbeat cycle, yet kinematic images show that the bird does not decelerate. It ...

Ben-Gida, Hadar; Taylor, Zachary J; Bezner-Kerr, Wayne; Guglielmo, Christopher G; Kopp, Gregory A; Gurka, Roi

2013-01-01T23:59:59.000Z

358

A Tour of the Aerodynamic and Hydraulic Research Infrastructure, Department of Engineering, University of Leicester  

E-Print Network [OSTI]

A Tour of the Aerodynamic and Hydraulic Research Infrastructure, Department of Engineering of the experimental facilities that are more relevant to fundamental and applied flow turbine research. The tour-section wind tunnel. This will be followed by a visit to the Hydraulics laboratory, Engineering Tower (13

Gorban, Alexander N.

359

Structural effects of unsteady aerodynamic forces on horizontal-axis wind turbines  

SciTech Connect (OSTI)

Due to its renewable nature and abundant resources, wind energy has the potential to fulfill a large portion of this nation`s energy needs. The simplest means of utilizing wind energy is through the use of downwind, horizontal-axis wind turbines (HAWT) with fixed-pitch rotors. This configuration regulates the peak power by allowing the rotor blade to aerodynamically stall. The stall point, the point of maximum coefficient of lift, is currently predicted using data obtained from wind tunnel tests. Unfortunately, these tests do not accurately simulate conditions encountered in the field. Flow around the tower and nacelle coupled with inflow turbulence and rotation of the turbine blades create unpredicted aerodynamic forces. Dynamic stall is hypothesized to occur. Such aerodynamic loads are transmitted into the rotor and tower causing structural resonance that drastically reduces the design lifetime of the wind turbine. The current method of alleviating this problem is to structurally reinforce the tower and blades. However, this adds unneeded mass and, therefore, cost to the turbines. A better understanding of the aerodynamic forces and the manner in which they affect the structure would allow for the design of more cost effective and durable wind turbines. Data compiled by the National Renewable Energy Laboratory (NREL) for a downwind HAWT with constant chord, untwisted, fixed-pitch rotors is analyzed. From these data, the actual aerodynamic characteristics of the rotor are being portrayed and the potential effects upon the structure can for the first time be fully analyzed. Based upon their understanding, solutions to the problem of structural resonance are emerging.

Miller, M.S.; Shipley, D.E. [Univ. of Colorado, Boulder, CO (United States). BioServe Space Technologies

1994-08-01T23:59:59.000Z

360

A detailed kinetic modeling study of toluene oxidation in a premixed laminar flame  

SciTech Connect (OSTI)

An improved chemical kinetic model for the toluene oxidation based on experimental data obtained in a premixed laminar low-pressure flame with vacuum ultraviolet (VUV) photoionization and molecular beam mass spectrometry (MBMS) techniques has been proposed. The present mechanism consists of 273 species up to chrysene and 1740 reactions. The rate constants of reactions of toluene, decomposition, reaction with oxygen, ipso-additions and metatheses with abstraction of phenylic H-atom are updated; new pathways of C{sub 4} + C{sub 2} species giving benzene and fulvene are added. Based on the experimental observations, combustion intermediates such as fulvenallene, naphtol, methylnaphthalene, acenaphthylene, 2-ethynylnaphthalene, phenanthrene, anthracene, 1-methylphenanthrene, pyrene and chrysene are involved in the present mechanism. The final toluene model leads to an overall satisfactory agreement between the experimentally observed and predicted mole fraction profiles for the major products and most combustion intermediates. The toluene depletion is governed by metathese giving benzyl radicals, ipso-addition forming benzene and metatheses leading to C{sub 6}H{sub 4}CH{sub 3} radicals. A sensitivity analysis indicates that the unimolecular decomposition via the cleavage of a C-H bond has a strong inhibiting effect, while decomposition via C-C bond breaking, ipso-addition of H-atom to toluene, decomposition of benzyl radicals and reactions related to C{sub 6}H{sub 4}CH{sub 3} radicals have promoting effect for the consumption of toluene. Moreover, flow rate analysis is performed to illustrate the formation pathways of mono- and polycyclic aromatics.

Tian, Z; Pitz, W J; Fournet, R; Glaude, P; Battin-Leclerc, F

2009-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Soot volume fraction and temperature measurements in laminar nonpremixed flames using thermocouples  

SciTech Connect (OSTI)

Thermocouple particle densitometry (TPD), a new method for measuring absolute soot volume fraction in flames which was suggested by Eisner and Rosner, has been successfully implemented in several laminar nonpremixed flames. This diagnostic relies on measuring the junction temperature history of a thermocouple rapidly inserted into a soot-containing flame region, then optimizing the fit between this history and one calculated from the principles of thermophoretic mass transfer. The TPD method is very simple to implement experimentally, yields spatially resolved volume fractions directly, can easily measure small volume fractions, and does not depend on the prevailing soot particle size, morphology, or optical characteristics. In a series of methane and ethylene counterflow flames whose soot volume fractions varied by more than an order of magnitude, the TPD results agreed to within experimental error with the authors own laser extinction measurements. In axisymmetric methane and ethylene co-flowing flames, the shape of TPD profiles agreed well with published laser extinction measurements, but the TPD concentrations were significantly larger in the early regions of the ethylene flame and throughout the methane flame; these discrepancies are probably attributable to visible light-transparent particles that are detectable with TPD but not with laser extinction. The TPD method is not applicable to the upper regions of these co-flowing flames since OH concentrations there suffice to rapidly oxidize any soot particles that deposit. Gas temperatures were obtained simultaneously with volume fraction by averaging the junction temperature history shortly after insertion. The error in these temperatures due to soot deposition-imposed changes in the junction diameter and emissivity were assessed and found to be moderate, e.g., less than 60 K near the centerline of the ethylene coflowing flame where the volume fraction was 6 ppm and the gas temperature was 1,550 K.

Mcenally, C.S.; Koeylue, U.O.; Pfefferle, L.D.; Rosner, D.E. [Yale Univ., New Haven, CT (United States)] [Yale Univ., New Haven, CT (United States)

1997-06-01T23:59:59.000Z

362

Soot formation in weakly buoyant acetylene-fueled laminar jet diffusion flames burning in air  

SciTech Connect (OSTI)

The structure and soot properties of weakly buoyant, acetylene-fueled, laminar jet diffusion flames were studied experimentally for combustion in air at pressures of 0.125--0.250 atm. The following measurements were made: soot volume fractions using laser extinction, temperatures using both thermocouples and multiline emission, soot structure using thermophoretic sampling and analysis by transmission electron microscopy, concentrations of major gas species using sampling and analysis by gas chromatography, and velocities using laser velocimetry. As distance increased along the axis of the present acetylene-fueled flames, significant soot formation began when temperatures exceeded roughly 1250 K, and ended when fuel-equivalence ratios decreased to roughly 1.7, where the concentration of acetylene became small. This behavior allowed observations of soot growth and nucleation for acetylene concentrations of 6 [times] 10[sup [minus]6]--1 [times] 10[sup [minus]3] and temperatures of 1,000--2,100 K. Over this range of conditions, soot growth rates were comparable to past observations of new soot in premixed flames, and after correction for effects of soot oxidation yielded essentially first-order growth with respect to acetylene concentrations with a negligible activation energy, and an acetylene/soot collision efficiency of 0.53%. Present measurements of soot nucleation rates also suggested first-order behavior with respect to acetylene concentrations but with an activation energy of 32 kcal/gmol and with rates that were significantly lower than earlier estimates in the literature. Nevertheless, uncertainties about the effects of soot oxidation and age on soot growth, and about effects of surface area estimates and translucent objects on soot nucleation, must be resolved in order to adequately define soot formation processes in diffusion flames.

Sunderland, P.B.; Koeylue, U.O.; Faeth, G.M. (Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering)

1995-01-01T23:59:59.000Z

363

Soot formation in laminar premixed ethylene/air flames at atmospheric pressure  

SciTech Connect (OSTI)

Soot formation was studied within laminar premixed ethylene/air flames (C/O ratios of 0.78--0.98) stabilized on a flat-flame burner operating at atmospheric pressure. Measurements included soot volume fractions by both laser extinction and gravimetric methods, temperatures by multiline emission, soot structure by thermophoretic sampling and transmission electric microscopy, major gas species concentrations by sampling and gas chromatography, concentrations of condensable hydrocarbons by gravimetric sampling, and velocities by laser velocimetry. These data were used to find soot surface growth rates and primary soot particle nucleation rates along the axes of the flames. Present measurements of soot surface growth rates were correlated successfully by predictions based on typical hydrogen-abstraction/carbon-addition (HACA) mechanisms of Frenklach and co-workers and Colket and Hall. These results suggest that reduced soot surface growth rates with increasing residence time seen in the present and other similar flames were mainly caused by reduced rates of surface activation due to reduced H atom concentrations as temperatures decrease as a result of radiative heat losses. Primary soot particle nucleation rates exhibited variations with temperature and acetylene concentrations that were similar to recent observations for diffusion flames; however, nucleation rates in the premixed flames were significantly lower than in the diffusion flames for reasons that still must be explained. Finally, predictions of yields of major gas species based on mechanisms from both Frenklach and co-workers and Leung and Lindstedt were in good agreement with present measurements and suggest that H atom concentrations (relevant to HACA mechanisms) approximate estimates based on local thermodynamic equilibrium in the present flames.

Xu, F.; Sunderland, P.B.; Faeth, G.M. [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering] [Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Aerospace Engineering

1997-03-01T23:59:59.000Z

364

Soot aerosol properties in laminar soot-emitting microgravity nonpremixed flames  

SciTech Connect (OSTI)

The spatial distributions and morphological properties of the soot aerosol are examined experimentally in a series of 0-g laminar gas-jet nonpremixed flames. The methodology deploys round jet diffusion flames of nitrogen-diluted acetylene fuel burning in quiescent air at atmospheric pressure. Full-field laser-light extinction is utilized to determine transient soot spatial distributions within the flames. Thermophoretic sampling is employed in conjunction with transmission electron microscopy to define soot microstructure within the soot-emitting 0-g flames. The microgravity tests indicate that the 0-g flames attain a quasi-steady state roughly 0.7 s after ignition, and sustain their annular structure even beyond their luminous flame tip. The measured peak soot volume fractions show a complex dependence on burner exit conditions, and decrease in a nonlinear fashion with decreasing characteristic flow residence times. Fuel preheat by {approximately}140K appears to accelerate the formation of soot near the flame axis via enhanced field pyrolysis rates. The increased soot presence caused by the elevated fuel injection temperatures triggers higher flame radiative losses, which may account for the premature suppression of soot growth observed along the annular region of preheated-fuel flames. Electron micrographs of soot aggregates collected in 0-g reveal the presence of soot precursor particles near the symmetry axis at midflame height. The observations also verify that soot primary particle sizes are nearly uniform among aggregates present at the same flame location, but vary considerably with radius at a fixed distance from the burner. The maximum primary size in 0-g is found to be by 40% larger than in 1-g, under the same burner exit conditions. Estimates of the number concentration of primary particles and surface area of soot particulate phase per unit volume of the combustion gases are also made for selected in-flame locations.

Konsur, B.; Megaridis, C.M.; Griffin, D.W.

1999-09-01T23:59:59.000Z

365

JOURNAL DE PHYSIQUE CoZZoque C9, suppZ6ment au noll, Tome 41, novembre 1980, page C9-423 EXPERIMENTAL STUDY OF A FREE-VORTEX AERODYNAMIC WINDOW  

E-Print Network [OSTI]

-423 EXPERIMENTAL STUDY OF A FREE-VORTEX AERODYNAMIC WINDOW W. Masuda and M. Yuasa Research Institute, Ishikawajima free-vortex aerodynamic window has been fabricated and tested. Aerodynamic performance studies show of solid materials, an aerodynamic window makes use of a nonabsorbing gas jet to permit the extraction

Paris-Sud XI, Université de

366

"Hybrid" Black Holes  

E-Print Network [OSTI]

We discuss a solution of the Einstein equations, obtained by gluing the external Kerr metric and the internal Weyl metric, describing an axisymmetric static vacuum distorted black hole. These metrics are glued at the null surfaces representing their horizons. For this purpose we use the formalism of massive thin null shells. The corresponding solution is called a "hybrid" black hole. The massive null shell has an angular momentum which is the origin of the rotation of the external Kerr spacetime. At the same time, the shell distorts the geometry inside the horizon. The inner geometry of the "hybrid" black hole coincides with the geometry of the interior of a non-rotating Weyl-distorted black hole. Properties of the "hybrid" black holes are briefly discussed.

Valeri P. Frolov; Andrei V. Frolov

2014-12-30T23:59:59.000Z

367

Hybridization and the Typological Paradigm  

E-Print Network [OSTI]

of hybridization events, which also have a significant role in ecological adaptation. One explanation of increased hybridization in some areas and not others is that stress from parasites results in selection for an increase of novel genotypes. Two swordtail...

Carlson, Charles

2012-02-14T23:59:59.000Z

368

Elgersburg School 2014 Hybrid Systems  

E-Print Network [OSTI]

Elgersburg School 2014 Hybrid Systems Worksheet 2 Problem 1. Consider the hybrid system given by C) Is V1(x) = 1 2 x2 2 + x1 (which represents the total energy of the ball) a Lyapunov function verifying

Knobloch,Jürgen

369

Corn Hybrids for Texas.  

E-Print Network [OSTI]

- Corn Hybrid$ for . ;mE Tgmt 4.College Sta. 9Sulphw Spgr. @.Holland l9.GreenviUe 24Stephmville 5.Kibyvilb IO.(;brkrvilb B.Tanpb 20Mm 25.Chilkothe TEXAS AGRICULTURAL EXPERIMENT STATIC R. D. LEWIS. DIRECTOR, COLLEGE STATION, TEXAS DIGEST... of the production has been entering com- mercial channels. About 2.5 percent of the total Texas corn acreage is harvested as silage and about 1 percent of the annual corn crop is used for human consum~tion. .- -. of improved corn hybrids. More favora-ble grow...

Rogers, J. S.; Bockholt, A. J.; Collier, J. W.

1957-01-01T23:59:59.000Z

370

Hybrid Vigor in Sorghum.  

E-Print Network [OSTI]

of the relia.ble measures of hybrid vigor, these height measurements furnish a means of estimating hybrid vigor in crosses. Materials The materials used in this study include the three strains of milo known as Extra Dwarf, Dwarf, and Standard; and three... strains of feterita known as Extra Dwarf, Dwarf, and Standard. It is note- worthy that in both milo and feterita parallel forms have been devel- oped in so far as stature is concerned. The mean height for Extra Dwarf milos and feteritas ranged from 56...

Conner, A. B. (Arthur Benjamin)

1927-01-01T23:59:59.000Z

371

Diagnostics for hybrid reactors  

SciTech Connect (OSTI)

The Hybrid Reactor(HR) can be considered an attractive actinide-burner or a fusion assisted transmutation for destruction of transuranic(TRU) nuclear waste. The hybrid reactor has two important subsystems: the tokamak neutron source and the blanket which includes a fuel zone where the TRU are placed and a tritium breeding zone. The diagnostic system for a HR must be as simple and robust as possible to monitor and control the plasma scenario, guarantee the protection of the machine and monitor the transmutation.

Orsitto, Francesco Paolo [ENEA Unita' Tecnica Fusione , Associazione ENEA-EURATOM sulla Fusione C R Frascati v E Fermi 45 00044 Frascati (Italy)

2012-06-19T23:59:59.000Z

372

Hybrid Neural Systems Stefan Wermter  

E-Print Network [OSTI]

Hybrid Neural Systems Stefan Wermter Ron Sun Springer, Heidelberg, New York January 2000 #12; Preface The aim of this book is to present a broad spectrum of current research in hybrid neural systems, and advance the state of the art in neural networks and arti#12;cial intelligence. Hybrid neural systems

Varela, Carlos

373

Hybrid Transmission Corridor study  

SciTech Connect (OSTI)

Hybrid Transmission Corridors are areas where High Voltage Alternating Current (HVAC) transmission lines and High Voltage Direct Current (HVDC) transmission lines exist in close proximity of each other. Because of the acceptance of HVDC as a means of transporting electric power over long distances and the difficulties associated with obtaining new right-of-ways, HVDC lines may have to share the same transmission corridor with HVAC lines. The interactions between conductors energized with different types of voltages causes changes in the electrical stresses applied to the conductors and insulators. As a result, corona phenomena, field effects and insulation performance can be affected. This report presents the results of an investigation of the HVAC-HVDC interaction and its effect on corona and AC and DC electric field phenomena. The method of investigation was based on calculation methods developed at the EPRI High Voltage Transmission Research Center (HVTRC) and supported by the results of full and reduced-scale line tests. Also, a survey of existing hybrid corridors is given along with the results of measurements made at one of those corridors. A number of examples in which an existing AC corridor may be transformed into a hybrid corridor are discussed. The main result of the research is an analytical/empirical model for predicting the electrical/environmental performance of hybrid corridors, a definition of ACDC interaction and a set of criteria for specifying when the interaction becomes significant, and a set of design rules.

Clairmont, B.A.; Johnson, G.B.; Zaffanella, L.E. (General Electric Co., Lenox, MA (United States))

1992-06-01T23:59:59.000Z

374

Hybrid Quantum Computation  

E-Print Network [OSTI]

We present a hybrid model of the unitary-evolution-based quantum computation model and the measurement-based quantum computation model. In the hybrid model part of a quantum circuit is simulated by unitary evolution and the rest by measurements on star graph states, thereby combining the advantages of the two standard quantum computation models. In the hybrid model, a complicated unitary gate under simulation is decomposed in terms of a sequence of single-qubit operations, the controlled-Z gates, and multi-qubit rotations around the z-axis. Every single-qubit- and the controlled-Z gate are realized by a respective unitary evolution, and every multi-qubit rotation is executed by a single measurement on a required star graph state. The classical information processing in our model only needs an information flow vector and propagation matrices. We provide the implementation of multi-control gates in the hybrid model. They are very useful for implementing Grover's search algorithm, which is studied as an illustrating example.

Arun Sehrawat; Daniel Zemann; Berthold-Georg Englert

2010-08-06T23:59:59.000Z

375

Fleet Evaluation and Factory Installation of Aerodynamic Heavy Duty Truck Trailers  

SciTech Connect (OSTI)

The purpose of DE-EE0001552 was to develop and deploy a combination of trailer aerodynamic devices and low rolling resistance tires that reduce fuel consumption of a class 8 heavy duty tractor-trailer combination vehicle by 15%. There were 3 phases of the project: Phase 1 Perform SAE Typed 2 track tests with multiple device combinations. Phase 2 Conduct a fleet evaluation with selected device combination. Phase 3 Develop the devices required to manufacture the aerodynamic trailer. All 3 phases have been completed. There is an abundance of available trailer devices on the market, and fleets and owner operators have awareness of them and are purchasing them. The products developed in conjunction with this project are at least in their second round of refinement. The fleet test undertaken showed an improvement of 5.5 7.8% fuel economy with the devices (This does not include tire contribution).

Beck, Jason; Salari, Kambiz; Ortega, Jason; Brown, Andrea

2013-09-30T23:59:59.000Z

376

State-space model identification and feedback control of unsteady aerodynamic forces  

E-Print Network [OSTI]

Unsteady aerodynamic models are necessary to accurately simulate forces and develop feedback controllers for wings in agile motion; however, these models are often high dimensional or incompatible with modern control techniques. Recently, reduced-order unsteady aerodynamic models have been developed for a pitching and plunging airfoil by linearizing the discretized Navier-Stokes equation with lift-force output. In this work, we extend these reduced-order models to include multiple inputs (pitch, plunge, and surge) and explicit parameterization by the pitch-axis location, inspired by Theodorsen's model. Next, we investigate the na\\"{\\i}ve application of system identification techniques to input--output data and the resulting pitfalls, such as unstable or inaccurate models. Finally, robust feedback controllers are constructed based on these low-dimensional state-space models for simulations of a rigid flat plate at Reynolds number 100. Various controllers are implemented for models linearized at base angles of ...

Brunton, Steven L; Rowley, Clarence W

2014-01-01T23:59:59.000Z

377

Sand transverse dune aerodynamics: 3D Coherent Flow Structures from a computational study  

E-Print Network [OSTI]

The engineering interest about dune fields is dictated by the their interaction with a number of human infrastructures in arid environments. The aerodynamic behaviour of sand dunes in atmospheric boundary layer belongs to the class of bluff bodies. Because of their simple geometry and their frequent occurrence in desert area, transverse sand dunes are usually adopted in literature as a benchmark to investigate dune aerodynamics by means of both computational or experimental approach, usually in nominally 2D setups. The writers suspect the flow in the wake is characterised by 3D features and affected by wind tunnel setup - e.g. blockage effect, duct side wall boundary layer, incoming velocity profile - when experimental studies are carried out. The present study aims at evaluating the 3D flow features of an idealised transverse dune under different setup conditions by means of computational simulations and to compare the obtained results with experimental measurements.

Bruno, Luca

2015-01-01T23:59:59.000Z

378

Effects of flow curvature on the aerodynamics of Darrieus wind turbines  

SciTech Connect (OSTI)

A theoretical and experimental investigation was conducted which clearly showed the effects of flow curvature to be significant determinants of Darrieus turbine blade aerodynamics; qualitatively, these results apply equally to straight or curved bladed machines. Unusually large boundary layer radial pressure gradients and virtually altered camber and incidence are the phenomena of primary importance. Conformal mapping techniques were developed which transform the geometric turbine airfoils in curved flow to their virtual equivalents in rectilinear flow, thereby permitting the more accurate selection of airfoil aerodynamic coefficients from published sectional data. It is demonstrated that once the flow idiosyncracies are fully understood, they may be used to advantage to improve the wind energy extraction efficiency of these machines.

Migliore, P. G.; Wolfe, W. P.

1980-07-01T23:59:59.000Z

379

Tactical missile aerodynamics - Prediction methodology. Progress in Astronautics and Aeronautics. Vol. 142  

SciTech Connect (OSTI)

The present volume discusses tactical missile aerodynamic drag, drag-prediction methods for axisymmetric missile bodies, an aerodynamic heating analysis for supersonic missiles, a component buildup method for engineering analysis of missiles at low-to-high angles of attack, experimental and analytical methods for missiles with noncircular fuselages, and a vortex-cloud model for body vortex shedding and tracking. Also discussed are panel methods with vorticity effects and corrections for nonlinear compressibility, supersonic full-potential methods for missile body analysis, space-marching Euler solvers, the time-asymptotic Euler/Navier-Stokes methods for subsonic and transonic flows, 3D boundary layers on missiles, Navier-Stokes analyses of flows over slender airframes, and the interaction of exhaust plumes with missile airframes.

Mendenhall, M.R. (Nielsen Engineering and Research, Inc., Mountain View, CA (United States))

1992-01-01T23:59:59.000Z

380

Nonpremixed ignition, laminar flame propagation, and mechanism reduction of n-butanol, iso-butanol, and methyl butanoate  

SciTech Connect (OSTI)

The non-premixed ignition temperature of n-butanol (CH{sub 3}CH{sub 2}CH{sub 2}CH{sub 2}OH), iso-butanol ((CH{sub 3}){sub 2}CHCH{sub 2}OH) and methyl butanoate (CH{sub 3}CH{sub 2}CH{sub 2}COOCH{sub 3}) was measured in a liquid pool assembly by heated oxidizer in a stagnation flow for system pressures of 1 and 3 atm. In addition, the stretch-corrected laminar flame speeds of mixtures of airn-butanol/iso-butanol/methyl butanoate were determined from the outwardly propagating spherical flame at initial pressures of up to 2 atm, for an extensive range of equivalence ratio. The ignition temperature and laminar flame speeds of n-butanol and methyl butanoate were computationally simulated with three recently developed kinetic mechanisms in the literature. Dominant reaction pathways to ignition and flame propagation were identified and discussed through a chemical explosive mode analysis (CEMA) and sensitivity analysis. The detailed models were further reduced through a series of systematic strategies. The reduced mechanisms provided excellent agreement in both homogeneous and diffusive combustion environments and greatly improved the computation efficiency.

Lu, Wei; Kelley, A. P.; Law, C. K.

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


381

The aerodynamic characteristics of an airfoil utilizing boundary layer and circulation control  

E-Print Network [OSTI]

AND DISCUSSION 22 Effects on Lift Effects on Drag 33 Effects on Pitching Moment 36 Accuracy of Data 37 Flow Interference 38 111 Chapte r VI CONCLUSIONS BIB LIO GRAPHY APPENDIX . Page 41 43 44 Table l. Aerodynamic Characteristics for Varying... control. The suction slot was 0. 065 inches wide and 2. 50 inches long in the spanwise direction. In order to measure the pressure distribution on the model, static pressure orifices were installed in the model surface at the spanwise centerline...

Boothe, Edward Milton

2012-06-07T23:59:59.000Z

382

Effects of Vehicle Image in Gasoline-Hybrid Electric Vehicles  

E-Print Network [OSTI]

The Images of Hybrid Vehicles Each of the householdsbetween hybrid and non-hybrid vehicles was observed in smallowned Honda Civic Hybrids, vehicles that are virtually

Heffner, Reid R.; Kurani, Kenneth S; Turrentine, Tom

2005-01-01T23:59:59.000Z

383

Hybrid quantum information processing  

E-Print Network [OSTI]

The development of quantum information processing has traditionally followed two separate and not immediately connected lines of study. The main line has focused on the implementation of quantum bit (qubit) based protocols whereas the other line has been devoted to implementations based on high-dimensional Gaussian states (such as coherent and squeezed states). The separation has been driven by the experimental difficulty in interconnecting the standard technologies of the two lines. However, in recent years, there has been a significant experimental progress in refining and connecting the technologies of the two fields which has resulted in the development and experimental realization of numerous new hybrid protocols. In this Review, we summarize these recent efforts on hybridizing the two types of schemes based on discrete and continuous variables.

Ulrik L. Andersen; Jonas S. Neergaard-Nielsen; Peter van Loock; Akira Furusawa

2014-09-12T23:59:59.000Z

384

Hybrid electroluminescent devices  

DOE Patents [OSTI]

A hybrid electroluminescent (EL) device comprises at least one inorganic diode element and at least one organic EL element that are electrically connected in series. The absolute value of the breakdown voltage of the inorganic diode element is greater than the absolute value of the maximum reverse bias voltage across the series. The inorganic diode element can be a power diode, a Schottky barrier diode, or a light-emitting diode.

Shiang, Joseph John (Niskayuna, NY); Duggal, Anil Raj (Niskayuna, NY); Michael, Joseph Darryl (Schenectady, NY)

2010-08-03T23:59:59.000Z

385

Save with Hybrid Refrigeration  

E-Print Network [OSTI]

SAVE WITH HYBRID REFRIGERATION Cheng-Wen (Wayne) Chung, P.E. Fluor Engineers, Inc. Irvine, California ABSTRACT Two level demand makes it possible to use two systems for refrigeration and save energy and money. An example of this type... of refrigeration, consisting of an ammonia absorption refrigeration (AAR) unit and a mechanical compression refrigera tion (MCR) unit, is presented in this article. This paper will briefly describe process configur ation, advantages and utility consumption...

Chung, C. W.

386

Hybrid X-pinches  

SciTech Connect (OSTI)

Results from experimental studies of a hybrid X-pinch with an initial configuration in the form of a high-current diode with conical tungsten electrodes spaced by 1-2 mm and connected to one another with 20- to 100-{mu}m-diameter wires are presented. The experiments were carried out at four facilities with a current amplitude from 200 to 1000 kA and front duration from 45 to 200 ns. It is shown that, in spite of their simpler configuration, hybrid X-pinches with a short rise time of the current pulse (50-100 ns) are highly competitive with standard X-pinches in the generated soft X-ray power and the formation of a single hot spot in them is much more stable, while hard X-ray emission is almost absent. The possibility of using hybrid X-pinches as soft X-ray sources for point projection X-ray imaging of plasma objects is considered.

Shelkovenko, T. A.; Pikuz, S. A.; Mishin, S. A.; Mingaleev, A. R. [Russian Academy of Sciences, P.N. Lebedev Physical Institute (Russian Federation); Tilikin, I. N. [Moscow Institute of Physics and Technology (Russian Federation); Knapp, P. F.; Cahill, A. D.; Hoyt, C. L.; Hammer, D. A. [Cornell University (United States)

2012-05-15T23:59:59.000Z

387

Hybrid solar lighting distribution systems and components  

DOE Patents [OSTI]

A hybrid solar lighting distribution system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates all components.

Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

2011-07-05T23:59:59.000Z

388

Hybrid solar lighting systems and components  

DOE Patents [OSTI]

A hybrid solar lighting system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates each component.

Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

2007-06-12T23:59:59.000Z

389

Hybrid Computer Architectures Motivations for Research  

E-Print Network [OSTI]

Hybrid Computer Architectures Motivations for Research What Is a Hybrid Processor? Hybrid commercial hybrid chips provide fixed processing cores and Field Programmable Gate Array (FPGA) elements an Application Specific Integrated Service (ASIC) can provide. How Do We Use Them? Hybrid chips seem uniquely

Mohanty, Saraju P.

390

Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines  

SciTech Connect (OSTI)

When work began on the Darrieus vertical axis wind turbine (VAWT) program at Sandia National Laboratories, it was recognized that there was a paucity of symmetrical airfoil data needed to describe the aerodynamics of turbine blades. Curved-bladed Darrieus turbines operate at local Reynolds numbers (Re) and angles of attack (..cap alpha..) seldom encountered in aeronautical applications. This report describes (1) a wind tunnel test series conducted at moderate values of Re in which 0 less than or equal to ..cap alpha.. less than or equal to 180/sup 0/ force and moment data were obtained for four symmetrical blade-candidate airfoil sections (NACA-0009, -0012, -0012H, and -0015), and (2) how an airfoil property synthesizer code can be used to extend the measured properties to arbitrary values of Re (10/sup 4/ less than or equal to Re less than or equal to 10/sup 7/) and to certain other section profiles (NACA-0018, -0021, -0025).

Sheldahl, R E; Klimas, P C

1981-03-01T23:59:59.000Z

391

Compositional Variation Within Hybrid Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Compositional Variation Within Hybrid Nanostructures Print The inherently high surface area of bimetallic nanoparticles makes them especially attractive materials for heterogeneous...

392

Quantifying the benefits of hybrid vehicles  

E-Print Network [OSTI]

secrets, but the price of hybrid cars and trucks are betweenCosts of hybrid vehicles Depending on whether a car companydiesel-hybrid prototypes that attained 70 MPG (Green Car

Turrentine, Tom; Delucchi, Mark; Heffner, Reid R.; Kurani, Kenneth S; Sun, Yongling

2006-01-01T23:59:59.000Z

393

Issue 5: High Interest in Hybrid Cars  

E-Print Network [OSTI]

2005). High Interest in Hybrid Cars. SCS Fact Sheet, Vol.May 2005 High Interest in Hybrid Cars I NTRODUCTION PublicThe unique features of a hybrid car mean that it is more

Ong, Paul M.; Haselhoff, Kim

2005-01-01T23:59:59.000Z

394

Quantifying the benefits of hybrid vehicles  

E-Print Network [OSTI]

The Emergence of Hybrid Vehicles: Ending oils strangleholdthe benefits of hybrid vehicles Dr. Thomas Turrentine Dr.the benefits of hybrid vehicles Report prepared for CSAA Dr.

Turrentine, Tom; Delucchi, Mark; Heffner, Reid R.; Kurani, Kenneth S; Sun, Yongling

2006-01-01T23:59:59.000Z

395

Lower Hybrid Experiments  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: VegetationEquipment Surfaces and InterfacesAdministration -Lowell L. Wood, 1981 The ErnestLower Hybrid

396

Programming Hybrid HPC Systems  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 - SeptemberMicroneedles for4-16Hamada wins GeraldDuncanProgramProgramming Hybrid HPC

397

Variation in the aerodynamic drag coefficient due to changes in the shape of an automobile  

E-Print Network [OSTI]

VARIATION IN THE AERODXMMIC DRAG COEEEICIENT DUE TO CHANGES LN THE SHAPE OF AN AUTOMOBILE A Thesis by JOHN GILBERT MILLI%MS Su'bmitned to the Graduate College of the Texas A&M University in partial fulfillment of the requirements fo... Air Density C HAFTER I IliiTRODUCTION During the early years of the automobile, little or no effort was made to explore the problem of aerodynamic drag. This situation was the result oi' two factors. First, the passenger cars of shat time were...

Williams, John Gilbert

1968-01-01T23:59:59.000Z

398

Numerical computation of aerodynamic sensitivity coefficients in the transonic and supersonic regimes  

E-Print Network [OSTI]

). Differentiating Eqs. (9) and (10) with respect to x and substituting the results into Eq. (8) yields For parabolic-arc sections Fu 1 - 2C(L-x)/LL ? w + 2T(1-2x) For NACA four-digit sections (11) Fu 1 - 2C(L-x)/LL + 5T(0. 14845/Jx-0. 126-0. 7032x+0. 8529x... by Leland A. Garison (Chair of Committee) Cyrus Ostowari (Member) Steven D. Talia erro (Member) W. E. Haisler (Head of Department) May 1988 ABSTRACT Numerical Computation of Aerodynamic Sensitivity Coefficients in the Transonic and Supersonic...

Elbanna, Hesham Mahmoud

1988-01-01T23:59:59.000Z

399

Tactical missile aerodynamics - General topics. Progress in Astronautics and Aeronautics. Vol. 141  

SciTech Connect (OSTI)

The present volume discusses the development history of tactical missile airframes, aerodynamic considerations for autopilot design, a systematic method for tactical missile design, the character and reduction of missile observability by radar, the visualization of high angle-of-attack flow phenomena, and the behavior of low aspect ratio wings at high angles of attack. Also discussed are airbreathing missile inlets, 'waverider' missile configurations, bodies with noncircular cross-sections and bank-to-turn missiles, asymmetric flow separation and vortex shedding on bodies-of-revolution, unsteady missile flows, swept shock-wave/boundary-layer interactions, pylon carriage and separation of stores, and internal stores carriage and separation.

Hemsch, M.J. (Lockheed Engineering and Sciences Co., Hampton, VA (United States))

1992-01-01T23:59:59.000Z

400

A hybrid vehicle evaluation code and its application to vehicle design. Revision 2  

SciTech Connect (OSTI)

This paper describes a hybrid vehicle simulation model which can be applied to many of the vehicles currently being considered for low pollution and high fuel economy. The code operates in batch mode with all the vehicle information stored in data files. The code calculates power train dimensions, fuel economy for three driving schedules, time for 0-96 km/h at maximum acceleration, hill climbing performance, and pollution generation rates. This paper also documents the application of the code to a hybrid vehicle that utilizes a hydrogen internal combustion engine. The simulation model is used for parametric studies of the vehicle. The results show the fuel economy of the vehicle as a function of vehicle mass, aerodynamic drag, engine efficiency, accessory load, and flywheel efficiency. The code also calculates the minimum flywheel energy and power to obtain a desired performance. The hydrogen hybrid vehicle analyzed in the paper has a range of 480 km (300 miles), with a predicted gasoline equivalent fuel efficiency of 33.7 km/liter (79.3 mpg).

Aceves, S.M.; Smith, J.R.

1994-12-13T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

A hybrid vehicle evaluation code and its application to vehicle design. Revision 1  

SciTech Connect (OSTI)

This paper describes a hybrid vehicle simulation model which can be applied to many of the vehicles currently being considered for low pollution and high fuel economy. The code operates in batch mode with all the vehicle information stored in data files. The code calculates fuel economy for three driving schedules, time for 0--96 km/h at maximum acceleration, hill climbing performance, power train dimensions, and pollution generation rates. This paper also documents the application of the code to a hybrid vehicle that utilizes a hydrogen internal combustion engine. The simulation model is used for parametric studies of the vehicle. The results show the fuel economy of the vehicle as a function of vehicle mass, aerodynamic drag, engine efficiency, accessory load, and flywheel efficiency. The code also calculates the minimum flywheel energy and power to obtain a desired performance. The hydrogen hybrid vehicle analyzed in the paper has a predicted range of 480 km (300 miles), with a gasoline equivalent fuel efficiency of 34.2 km/liter (80.9 mpg).

Aceves, S.M.; Smith, J.R.

1994-09-15T23:59:59.000Z

402

Advanced Hybrid Water Heater using Electrochemical Compressor...  

Energy Savers [EERE]

Advanced Hybrid Water Heater using Electrochemical Compressor Advanced Hybrid Water Heater using Electrochemical Compressor Xergy is using its Electro Chemical Compression (ECC)...

403

Advanced Coal Wind Hybrid: Economic Analysis  

E-Print Network [OSTI]

Renewable Energy and Energy Efficiency, DOE. LBNL 275-E Advanced Coal Wind Hybrid:Renewable Energy Laboratory), and Ryan Wiser ( LBNL). i Advanced Coal Wind Hybrid:

Phadke, Amol

2008-01-01T23:59:59.000Z

404

Hybrid Rotaxanes: Interlocked Structures for Quantum Computing...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

with hybrid rotaxanes, in which inorganic rings encircle the organic axles. The hybrid architecture greatly increases their range of useful physical properties, such as the...

405

Advanced Coal Wind Hybrid: Economic Analysis  

E-Print Network [OSTI]

of Figures Figure ES-1. Advanced Coal Wind Hybrid: Basicviii Figure 1. Advanced-Coal Wind Hybrid: Basic29 Figure 9. Sensitivity to Coal

Phadke, Amol

2008-01-01T23:59:59.000Z

406

Essays On Hybrid Bundle Pricing  

E-Print Network [OSTI]

Increasingly, firms are offering hybrid bundles products that combine both good(s) and service(s). Some hybrid bundles, such as TiVo that combines a DVR and recording management are more visible, while some, such as GEs Powerplant System...

Meyer, Jeffrey Dean

2011-10-21T23:59:59.000Z

407

Hybrid spread spectrum radio system  

DOE Patents [OSTI]

Systems and methods are described for hybrid spread spectrum radio systems. A method, includes receiving a hybrid spread spectrum signal including: fast frequency hopping demodulating and direct sequence demodulating a direct sequence spread spectrum signal, wherein multiple frequency hops occur within a single data-bit time and each bit is represented by chip transmissions at multiple frequencies.

Smith, Stephen F. (London, TN) [London, TN; Dress, William B. (Camas, WA) [Camas, WA

2010-02-09T23:59:59.000Z

408

HYBRID LOGICS Carlos Areces and Balder ten Cate  

E-Print Network [OSTI]

14 HYBRID LOGICS Carlos Areces and Balder ten Cate 1 What are Hybrid Logics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 828 2.3 Very Expressive Hybrid Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 863 This chapter provides a modern overview of the field of hybrid logic. Hybrid logics are ex

Sattler, Ulrike

409

HYBRID LOGICS Carlos Areces and Balder ten Cate  

E-Print Network [OSTI]

14 HYBRID LOGICS Carlos Areces and Balder ten Cate 1 What are Hybrid Logics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 Very Expressive Hybrid Languages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 This chapter provides a modern overview of the field of hybrid logic. Hybrid logics are ex

ten Cate, Balder

410

Coupling a Mesoscale Numerical Weather Prediction Model with Large-Eddy Simulation for Realistic Wind Plant Aerodynamics Simulations (Poster)  

SciTech Connect (OSTI)

Wind plant aerodynamics are influenced by a combination of microscale and mesoscale phenomena. Incorporating mesoscale atmospheric forcing (e.g., diurnal cycles and frontal passages) into wind plant simulations can lead to a more accurate representation of microscale flows, aerodynamics, and wind turbine/plant performance. Our goal is to couple a numerical weather prediction model that can represent mesoscale flow [specifically the Weather Research and Forecasting model] with a microscale LES model (OpenFOAM) that can predict microscale turbulence and wake losses.

Draxl, C.; Churchfield, M.; Mirocha, J.; Lee, S.; Lundquist, J.; Michalakes, J.; Moriarty, P.; Purkayastha, A.; Sprague, M.; Vanderwende, B.

2014-06-01T23:59:59.000Z

411

Computerized method and system for designing an aerodynamic focusing lens stack  

DOE Patents [OSTI]

A computerized method and system for designing an aerodynamic focusing lens stack, using input from a designer related to, for example, particle size range to be considered, characteristics of the gas to be flowed through the system, the upstream temperature and pressure at the top of a first focusing lens, the flow rate through the aerodynamic focusing lens stack equivalent at atmosphere pressure; and a Stokes number range. Based on the design parameters, the method and system determines the total number of focusing lenses and their respective orifice diameters required to focus the particle size range to be considered, by first calculating for the orifice diameter of the first focusing lens in the Stokes formula, and then using that value to determine, in iterative fashion, intermediate flow values which are themselves used to determine the orifice diameters of each succeeding focusing lens in the stack design, with the results being output to a designer. In addition, the Reynolds numbers associated with each focusing lens as well as exit nozzle size may also be determined to enhance the stack design.

Gard, Eric (San Francisco, CA); Riot, Vincent (Oakland, CA); Coffee, Keith (Diablo Grande, CA); Woods, Bruce (Livermore, CA); Tobias, Herbert (Kensington, CA); Birch, Jim (Albany, CA); Weisgraber, Todd (Brentwood, CA)

2011-11-22T23:59:59.000Z

412

Advanced Aerodynamic Devices to Improve the Performance, Economics, Handling, and Safety of Heavy Vehicles  

SciTech Connect (OSTI)

Research is being conducted at the Georgia Tech Research Institute (GTRI) to develop advanced aerodynamic devices to improve the performance, economics, stability, handling and safety of operation of Heavy Vehicles by using previously-developed and flight-tested pneumatic (blown) aircraft technology. Recent wind-tunnel investigations of a generic Heavy Vehicle model with blowing slots on both the leading and trailing edges of the trailer have been conducted under contract to the DOE Office of Heavy Vehicle Technologies. These experimental results show overall aerodynamic drag reductions on the Pneumatic Heavy Vehicle of 50% using only 1 psig blowing pressure in the plenums, and over 80% drag reductions if additional blowing air were available. Additionally, an increase in drag force for braking was confirmed by blowing different slots. Lift coefficient was increased for rolling resistance reduction by blowing only the top slot, while downforce was produced for traction increase by blowing only the bottom. Also, side force and yawing moment were generated on either side of the vehicle, and directional stability was restored by blowing the appropriate side slot. These experimental results and the predicted full-scale payoffs are presented in this paper, as is a discussion of additional applications to conventional commercial autos, buses, motor homes, and Sport Utility Vehicles.

Robert J. Englar

2001-05-14T23:59:59.000Z

413

Aerodynamic pressure and flow-visualization measurement from a rotating wind turbine blade  

SciTech Connect (OSTI)

Aerodynamic, load, flow-visualization, and inflow measurements have been made on a 10-m, three-bladed, downwind, horizontal-axis wind turbine (HAWT). A video camera mounted on the rotor was used to record nighttime and daytime video images of tufts attached to the low-pressure side of a constant-chord, zero-twist blade. Load measurements were made using strain gages mounted at every 10% of the blade's span. Pressure measurements were made at 80% of the blade's span. Pressure taps were located at 32 chordwise positions, revealing pressure distributions comparable with wind tunnel data. Inflow was measured using a vertical-plane array of eight propvane and five triaxial (U-V-W) prop-type anemometers located 10 m upwind in the predominant wind direction. One objective of this comprehensive research program was to study the effects of blade rotation on aerodynamic behavior below, near, and beyond stall. To this end, flow patterns are presented here that reveal the dynamic and steady behavior of flow conditions on the blade. Pressure distributions are compared to flow patterns and two-dimensional wind tunnel data. Separation boundary locations are shown that change as a function of spanwise location, pitch angle, and wind speed. 6 refs., 23 figs., 1 tab.

Butterfield, C.P.

1988-11-01T23:59:59.000Z

414

This is a preprint of the following article, which is available from http://mdolab.engin.umich.edu Zhoujie Lyu and J. R. R. A. Martins. Aerodynamic Shape Optimization Investigations of the Common  

E-Print Network [OSTI]

://mdolab.engin.umich.edu Zhoujie Lyu and J. R. R. A. Martins. Aerodynamic Shape Optimization Investigations of the Common Research this preprint. Aerodynamic Shape Optimization Investigations of the Common Research Model Wing Benchmark Zhoujie, University of Michigan, Ann Arbor, MI Abstract Despite considerable research on aerodynamic shape

Papalambros, Panos

415

Hybrid powertrain controller  

DOE Patents [OSTI]

A hybrid powertrain for a vehicle comprising a diesel engine and an electric motor in a parallel arrangement with a multiple ratio transmission located on the torque output side of the diesel engine, final drive gearing connecting drivably the output shaft of transmission to traction wheels of the vehicle, and an electric motor drivably coupled to the final drive gearing. A powertrain controller schedules fuel delivered to the diesel engine and effects a split of the total power available, a portion of the power being delivered by the diesel and the balance of the power being delivered by the motor. A shifting schedule for the multiple ratio transmission makes it possible for establishing a proportional relationship between accelerator pedal movement and torque desired at the wheels. The control strategy for the powertrain maintains drivability of the vehicle that resembles drivability of a conventional spark ignition vehicle engine powertrain while achieving improved fuel efficiency and low exhaust gas emissions.

Jankovic, Miroslava (Birmingham, MI); Powell, Barry Kay (Belleville, MI)

2000-12-26T23:59:59.000Z

416

ADVANCED HYBRID PARTICULATE COLLECTOR  

SciTech Connect (OSTI)

A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the US Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in a manner that has not been done before. The AHPC concept consists of a combination of fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two collection methods, both in the particulate collection step and in the transfer of dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emission with conventional ESPs, and it solves the problem of reentrainment and collection of dust in conventional baghouses. The AHPC is currently being tested at the 2.7-MW scale at the Big Stone power station.

Stanley Miller; Rich Gebert; William Swanson

1999-11-01T23:59:59.000Z

417

Hybrid dark energy  

E-Print Network [OSTI]

Extending previous results [Phys. Rev. Lett. 97, 081301 (2006)], we explore the cosmological implications of a new quintessence scenario driven by a slow rolling homogeneous scalar field whose equation of state behaved as freezing over the entire cosmic evolution, is approaching -1 today, but will become thawing in the near future, thereby driving the Universe to an eternal deceleration. We argue that such a mixed behavior, named \\emph{hybrid}, may reconcile the slight preference of current observational data for freezing potentials with the impossibility of defining observables in the String/M-theory context due to the existence of a cosmological event horizon in asymptotically de Sitter universes as, e.g., pure freezing scenarios.

J. S. Alcaniz; R. Silva; F. C. Carvalho; Zong-Hong Zhu

2008-07-16T23:59:59.000Z

418

Hybrid Systems: From Verification to Falsification  

E-Print Network [OSTI]

Hybrid Systems: From Verification to Falsification Erion Plaku, Lydia E. Kavraki, and Moshe Y}@cs.rice.edu Abstract. We propose HyDICE, Hybrid DIscrete Continuous Exploration, a multi­layered approach for hybrid. The discrete search uses the discrete transitions of the hybrid system and coarse­grained decompositions

Vardi, Moshe Y.

419

Hybrid Abstractions that Preserve Timed Languages  

E-Print Network [OSTI]

Hybrid Abstractions that Preserve Timed Languages Paulo Tabuada1 and George J. Pappas2 1 Instituto@ee.upenn.edu Abstract. In this paper we consider the problem of extracting an ab- straction from a hybrid control system that determine when trajectories of the original hybrid system can be generated by the abstracted hybrid system

Pappas, George J.

420

VLA HYBRID CONFIGURATIONS A Critical Look  

E-Print Network [OSTI]

VLA HYBRID CONFIGURATIONS A Critical Look Barry Clark EVLA Memo 180 July 2014 The VLA hybrid weeks (plus the two week hybrid), whereas going directly from one main configuration to another could 4.5%. 2. The time requests in the hybrid configuration are heavily weighted to the galactic center

Groppi, Christopher

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Hybrid Systems: From Verification to Falsification  

E-Print Network [OSTI]

Hybrid Systems: From Verification to Falsification Erion Plaku, Lydia E. Kavraki, and Moshe Y}@cs.rice.edu Abstract. We propose HyDICE, Hybrid DIscrete Continuous Exploration, a multi-layered approach for hybrid. The discrete search uses the discrete transitions of the hybrid system and coarse-grained decompositions

Kavraki, Lydia E.

422

HYBRID SPECIATION IN WILD SUNFLOWERS1  

E-Print Network [OSTI]

HYBRID SPECIATION IN WILD SUNFLOWERS1 Loren H. Rieseberg2 ABSTRACT Hybrid speciation refers to the establishment of novel hybrid genotypes that are reproductively isolated from their parental species, in some instances new hybrid species arise and become reproductively isolated without a change

Rieseberg, Loren

423

Hybrid Vehicle Program. Final report  

SciTech Connect (OSTI)

This report summarizes the activities on the Hybrid Vehicle Program. The program objectives and the vehicle specifications are reviewed. The Hybrid Vehicle has been designed so that maximum use can be made of existing production components with a minimum compromise to program goals. The program status as of the February 9-10 Hardware Test Review is presented, and discussions of the vehicle subsystem, the hybrid propulsion subsystem, the battery subsystem, and the test mule programs are included. Other program aspects included are quality assurance and support equipment. 16 references, 132 figures, 47 tables.

None

1984-06-01T23:59:59.000Z

424

Triplex in-situ hybridization  

DOE Patents [OSTI]

Disclosed are methods for detecting in situ the presence of a target sequence in a substantially double-stranded nucleic acid segment, which comprises: a) contacting in situ under conditions suitable for hybridization a substantially double-stranded nucleic acid segment with a detectable third strand, said third strand being capable of hybridizing to at least a portion of the target sequence to form a triple-stranded structure, if said target sequence is present; and b) detecting whether hybridization between the third strand and the target sequence has occured.

Fresco, Jacques R. (Princeton, NJ); Johnson, Marion D. (East Windsor, NJ)

2002-01-01T23:59:59.000Z

425

Hybrid Charmonium and the $?-?$ Puzzle  

E-Print Network [OSTI]

Using the method of QCD Sum Rules, we estimate the energy of the lowest hybrid Charmonium state, and find it to be at the energy of the $\\Psi'(2S)$ state, about 600 Mev above the $J/\\Psi(1S)$ state. Since our solution is not consistent with a pure hybrid at this energy, we conclude that the $\\Psi'(2S)$ state is probably an admixed $c \\bar{c}$ and hybrid $c \\bar{c}g$ state. From this conjecture we find a possible explanation of the famous $\\rho-\\pi$ puzzle.

Leonard S. Kisslinger; Diana Parno; Seamus Riordan

2008-05-13T23:59:59.000Z

426

On hybrid control of complex systems: Sur la commande hybride des systmes  

E-Print Network [OSTI]

On hybrid control of complex systems: a survey Sur la commande hybride des syst·mes complexes a brief overview of hybrid control systems is given and an introduction to several approaches in hybrid to hybrid control. RESUME. L'objectif de cet article est de prZsenter un Ztat de l'art des travaux relatifs

Koutsoukos, Xenofon D.

427

Hybrid Geometric Reduction of Hybrid Systems Aaron D. Ames and Shankar Sastry  

E-Print Network [OSTI]

Hybrid Geometric Reduction of Hybrid Systems Aaron D. Ames and Shankar Sastry Abstract-- This paper presents a unifying framework in which to carry out the hybrid geometric reduction of hybrid systems, generalizing classical reduction to a hybrid setting. I. INTRODUCTION The reduction of mechanical systems

Sastry, S. Shankar

428

A study on aerodynamics and mechanisms of elementary morphing models for flapping wing in bat forward flight  

E-Print Network [OSTI]

The large active wing deformation is a significant way to generate high aerodynamic forces required in bat flapping flight. Besides the twisting, the elementary morphing models of a bat wing are proposed, such as wing-bending in the spanwise direction, wing-cambering in the chordwise direction, and wing area-changing. A plate of aspect ratio 3 is used to model a bat wing and a three dimensional unsteady panel method is applied to predict the aerodynamic forces. It is found that the cambering model has a great positive influence on the lift, followed by area-changing model and then the bending model. The further study indicates that the vortex control is a main mechanism to produce high aerodynamic forces, and the mechanisms for the aerodynamic force enhancement are the asymmetry of the cambered wing and the amplifier effects of wing area-changing and wing bending. The lift and thrust are mainly generated during the downstroke and almost negligible forces during the upstroke by the integrated morphing model-wi...

Zi-Wu, Guan

2014-01-01T23:59:59.000Z

429

Global optimization of hybrid systems  

E-Print Network [OSTI]

Systems that exhibit both discrete state and continuous state dynamics are called hybrid systems. In most nontrivial cases, these two aspects of system behavior interact to such a significant extent that they cannot be ...

Lee, Cha Kun

2006-01-01T23:59:59.000Z

430

Hybrid Fuel Cell Technology Overview  

SciTech Connect (OSTI)

For the purpose of this STI product and unless otherwise stated, hybrid fuel cell systems are power generation systems in which a high temperature fuel cell is combined with another power generating technology. The resulting system exhibits a synergism in which the combination performs with an efficiency far greater than can be provided by either system alone. Hybrid fuel cell designs under development include fuel cell with gas turbine, fuel cell with reciprocating (piston) engine, and designs that combine different fuel cell technologies. Hybrid systems have been extensively analyzed and studied over the past five years by the Department of Energy (DOE), industry, and others. These efforts have revealed that this combination is capable of providing remarkably high efficiencies. This attribute, combined with an inherent low level of pollutant emission, suggests that hybrid systems are likely to serve as the next generation of advanced power generation systems.

None available

2001-05-31T23:59:59.000Z

431

Hybrid Zero-capacity Channels  

E-Print Network [OSTI]

There are only two known kinds of zero-capacity channels. The first kind produces entangled states that have positive partial transpose, and the second one - states that are cloneable. We consider the family of 'hybrid' quantum channels, which lies in the intersection of the above classes of channels and investigate its properties. It gives rise to the first explicit examples of the channels, which create bound entangled states that have the property of being cloneable to the arbitrary finite number of parties. Hybrid channels provide the first example of highly cloneable binding entanglement channels, for which known superactivation protocols must fail - superactivation is the effect where two channels each with zero quantum capacity having positive capacity when used together. We give two methods to construct a hybrid channel from any binding entanglement channel. We also find the low-dimensional counterparts of hybrid states - bipartite qubit states which are extendible and possess two-way key.

Sergii Strelchuk; Jonathan Oppenheim

2012-07-04T23:59:59.000Z

432

Laminar burning velocities of lean hydrogen-air mixtures at pressures up to 1.0 MPa  

SciTech Connect (OSTI)

Values of laminar burning velocity, u{sub l}, and the associated strain rate Markstein number, Ma{sub sr}, of H{sub 2}-air mixtures have been obtained from measurements of flame speeds in a spherical explosion bomb with central ignition. Pressures ranged from 0.1 to 1.0 MPa, with values of equivalence ratio between 0.3 and 1.0. Many of the flames soon became unstable, with an accelerating flame speed, due to Darrieus-Landau and thermodiffusive instabilities. This effect increased with pressure. The flame wrinkling arising from the instabilities enhanced the flame speed. A method is described for allowing for this effect, based on measurements of the flame radii at which the instabilities increased the flame speed. This enabled u{sub l} and Ma{sub sr} to be obtained, devoid of the effects of instabilities. With increasing pressure, the time interval between the end of the ignition spark and the onset of flame instability, during which stable stretched flame propagation occurred, became increasingly small and very high camera speeds were necessary for accurate measurement. Eventually this time interval became so short that first Ma{sub sr} and then u{sub l} could not be measured. Such flame instabilities throw into question the utility of u{sub l} for high pressure, very unstable, flames. The measured values of u{sub l} are compared with those predicted by detailed chemical kinetic models of one-dimensional flames. (author)

Bradley, D.; Lawes, M.; Liu, Kexin; Woolley, R. [School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT (United Kingdom); Verhelst, S. [Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent (Belgium)

2007-04-15T23:59:59.000Z

433

A Lean Methane Prelixed Laminar Flame Doped witg Components of Diesel Fuel. Part I: n)Butylbenzene  

E-Print Network [OSTI]

To better understand the chemistry involved during the combustion of components of diesel fuel, the structure of a laminar lean premixed methane flame doped with n-butylbenzene has been investigated. The inlet gases contained 7.1% (molar) of methane, 36.8% of oxygen and 0.96% of n-butylbenzene corresponding to an equivalence ratio of 0.74 and a ratio C10H14 / CH4 of 13.5%. The flame has been stabilized on a burner at a pressure of 6.7 kPa using argon as diluent, with a gas velocity at the burner of 49.2 cm/s at 333 K. Quantified species included the usual methane C0-C2 combustion products, but also 16 C3-C5 hydrocarbons, 7 C1-C3 oxygenated compounds, as well as 20 aromatic products, namely benzene, toluene, phenylacetylene, styrene, ethylbenzene, xylenes, allylbenzene, propylbenzene, cumene, methylstyrenes, butenylbenzenes, indene, indane, naphthalene, phenol, benzaldehyde, anisole, benzylalcohol, benzofuran, and isomers of C10H10 (1-methylindene, dihydronaphtalene, butadienylbenzene). A new mechanism for the...

Pousse, Emir; Fournet, Ren; Battin-Leclerc, Frdrique; 10.1016/j.combustflame.2008.09.012

2009-01-01T23:59:59.000Z

434

Thermophoretically augmented mass-, momentum-, and energy-transfer rates in high particle mass-loaded laminar forced convection systems  

SciTech Connect (OSTI)

In all previous treatments of thermophoretically-modified aerosol particle transport, even those which attempt to allow for variable host-gas properties, it has been explicitly (or implicitly) assumed that the particle mass fraction is small enough to neglect the influence of the suspended particles on the host-gas momentum-density- and energy-density-fields. However, in high-intensity material-processing applications, particle mass loadings often exceed 1/3, and the thermophoretically enhanced particle mass-deposition flux itself modifies the local-mixture velocity and temperature fields in the vicinity of the deposition surface. A self-consistent pseudo- single-phase mixture (diffusion) approximation which exploits the fact that the volume fraction of suspended particles is negligible even when the particle mass fraction is quite near unity is introduced to calculate the fully coupled problem of mass-, energy- and momentum diffusion for laminar boundary (LBL) flow of a combustion-gas mixture containing submicron particles of appreciable thermophoretic diffusivity but negligible Brownian diffusion. It is shown that thigh particles mass loading systematically increase the wall fluxes of momentum (shear stress), heat and particle mass, much like those effects associated with massive suction in single-phase LBL-theory.

Park, H.M.

1987-01-01T23:59:59.000Z

435

Aerodynamic drag reduction apparatus for gap-divided bluff bodies such as tractor-trailers  

DOE Patents [OSTI]

An apparatus for reducing the aerodynamic drag of a bluff-bodied vehicle such as a tractor-trailer in a flowstream, the bluff-bodied vehicle of a type having a leading portion, a trailing portion connected to the leading portion, and a gap between the leading and trailing portions defining a recirculation zone. The apparatus is preferably a baffle assembly, such as a vertical panel, adapted to span a width of the gap between the leading and trailing portions so as to impede cross-flow through the gap, with the span of the baffle assembly automatically adjusting for variations in the gap width when the leading and trailing portions pivot relative to each other.

Ortega, Jason M. (Pacifica, CA); Salari, Kambiz (Livermore, CA)

2006-07-11T23:59:59.000Z

436

Laboratory evaluation of fan/filter units' aerodynamic and energy performance  

SciTech Connect (OSTI)

The paper discusses the benefits of having a consistent testing method to characterize aerodynamic and energy performance of FFUs. It presents evaluation methods of laboratory-measured performance of ten relatively new, 1220 mm x 610 mm (or 4 ft x 2 ft) fan-filter units (FFUs), and includes results of a set of relevant metrics such as energy performance indices (EPI) based upon the sample FFUs tested. This paper concludes that there are variations in FFUs' performance, and that using a consistent testing and evaluation method can generate compatible and comparable FFU performance information. The paper also suggests that benefits and opportunities exist for our method of testing FFU energy performance to be integrated in future recommended practices.

Xu, Tengfang; Jeng, Ming-Shan

2004-07-27T23:59:59.000Z

437

Investigation of Tractor Base Bleeding for Heavy Vehicle Aerodynamic Drag Reduction  

SciTech Connect (OSTI)

One of the main contributors to the aerodynamic drag of a heavy vehicle is tractor-trailer gap drag, which arises when the vehicle operates within a crosswind. Under this operating condition, freestream flow is entrained into the tractor-trailer gap, imparting a momentum exchange to the vehicle and subsequently increasing the aerodynamic drag. While a number of add-on devices, including side extenders, splitter plates, vortex stabilizers, and gap sealers, have been previously tested to alleviate this source of drag, side extenders remain the primary add-on device of choice for reducing tractor-trailer gap drag. However, side extenders are not without maintenance and operational issues. When a heavy vehicle pivots sharply with respect to the trailer, as can occur during loading or unloading operations, the side extenders can become crushed against the trailer. Consequently, fleet operators are forced to incur additional costs to cover the repair or replacement of the damaged side extenders. This issue can be overcome by either shortening the side extenders or by devising an alternative drag reduction concept that can perform just as effectively as side extenders. To explore such a concept, we investigate tractor base bleeding as a means of reducing gap drag. Wind tunnel measurements are made on a 1:20 scale heavy vehicle model at a vehicle width-based Reynolds number of 420,000. The tractor bleeding flow, which is delivered through a porous material embedded within the tractor base, is introduced into the tractor-trailer gap at bleeding coefficients ranging from 0.0-0.018. To determine the performance of tractor base bleeding under more realistic operating conditions, computational fluid dynamics simulations are performed on a full-scale heavy vehicle within a crosswind for bleeding coefficients ranging from 0.0-0.13.

Ortega, J; Salari, K; Storms, B

2007-10-25T23:59:59.000Z

438

Hybrid power source  

DOE Patents [OSTI]

A hybrid power system is comprised of a high energy density element such as a fuel-cell and high power density elements such as a supercapacitor banks. A DC/DC converter electrically connected to the fuel cell and converting the energy level of the energy supplied by the fuel cell. A first switch is electrically connected to the DC/DC converter. First and second supercapacitors are electrically connected to the first switch and a second switch. A controller is connected to the first switch and the second switch, monitoring charge levels of the supercapacitors and controls the switching in response to the charge levels. A load is electrically connected to the second switch. The first switch connects the DC/DC converter to the first supercapacitor when the second switch connects the second supercapacitor to the load. The first switch connects the DC/DC converter to the second supercapacitor when the second switch connects the first supercapacitor to the load.

Singh, Harmohan N.

2012-06-05T23:59:59.000Z

439

ADVANCED HYBRID PARTICULATE COLLECTOR  

SciTech Connect (OSTI)

A new concept in particulate control, called an advanced hybrid particulate collector (AHPC), is being developed under funding from the US Department of Energy. The AHPC combines the best features of electrostatic precipitators (ESPs) and baghouses in an entirely novel manner. The AHPC concept combines fabric filtration and electrostatic precipitation in the same housing, providing major synergism between the two methods, both in the particulate collection step and in transfer of dust to the hopper. The AHPC provides ultrahigh collection efficiency, overcoming the problem of excessive fine-particle emissions with conventional ESPs, and solves the problem of reentrainment and recollection of dust in conventional baghouses. Phase I of the development effort consisted of design, construction, and testing of a 5.7-m{sup 3}/min (200-acfm) working AHPC model. Results from both 8-hour parametric tests and 100-hour proof-of-concept tests with two different coals demonstrated excellent operability and greater than 99.99% fine-particle collection efficiency.

Stanley J. Miller; Grant L. Schelkoph; Grant E. Dunham

2000-12-01T23:59:59.000Z

440

Optimum Performance of Direct Hydrogen Hybrid Fuel Cell Vehicles  

E-Print Network [OSTI]

in batteries, ultracapacitors, fuel cells and hybrid vehicleBattery, Hybrid and Fuel Cell Electric Vehicle SymposiumBattery, Hybrid and Fuel Cell Electric Vehicle Symposium

Zhao, Hengbing; Burke, Andy

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

System Simulations of Hybrid Electric Vehicles with Focus on...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

System Simulations of Hybrid Electric Vehicles with Focus on Emissions System Simulations of Hybrid Electric Vehicles with Focus on Emissions Comparative simulations of hybrid...

442

Ultracapacitor Technologies and Application in Hybrid and Electric Vehicles  

E-Print Network [OSTI]

The parallel hybrid passenger car (VW Golf) combined an EDLCpassenger cars using the ultracapacitors in micro-hybrid,passenger car using both carbon/carbon and hybrid carbon

Burke, Andy

2009-01-01T23:59:59.000Z

443

Effects of Vehicle Image in Gasoline-Hybrid Electric Vehicles  

E-Print Network [OSTI]

of Vehicle Image in Gasoline-Hybrid Electric Vehicles Reidof Vehicle Image in Gasoline-Hybrid Electric Vehicles Reidhigh demand for gasoline-hybrid electric vehicles (HEVs)?

Heffner, Reid R.; Kurani, Kenneth S; Turrentine, Tom

2005-01-01T23:59:59.000Z

444

Optimum Performance of Direct Hydrogen Hybrid Fuel Cell Vehicles  

E-Print Network [OSTI]

ultracapacitors, fuel cells and hybrid vehicle design. Dr.on electric and hybrid vehicle technology and applicationsand performance. Hybrid vehicles utilizing a load leveling

Zhao, Hengbing; Burke, Andy

2009-01-01T23:59:59.000Z

445

Evaluation Of Potential Hybrid Electric Vehicle Applications: Vol I  

E-Print Network [OSTI]

Vehicle Symposium, "The Hybrid Vehicle Revisited", OctoberBus Hv REFERENCES Hybrid Vehicle Assessment, Phase I,Laboratory, March 1984 Hybrid Vehicle Engineering Task

Gris, Arturo E.

1991-01-01T23:59:59.000Z

446

Are Batteries Ready for Plug-in Hybrid Buyers?  

E-Print Network [OSTI]

M. , 2006. Plug-in hybrid vehicle analysis. Milestonegas emissions from plug-in hybrid vehicles: implications forPresentation at SAE 2008 Hybrid Vehicle Technologies

Axsen, Jonn; Burke, Andy; Kurani, Kenneth S

2010-01-01T23:59:59.000Z

447

A Revolutionary Hybrid Thermodynamic Cycle for Bianary Geothermal...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

A Revolutionary Hybrid Thermodynamic Cycle for Bianary Geothermal Power A Revolutionary Hybrid Thermodynamic Cycle for Bianary Geothermal Power A Revolutionary Hybrid Thermodynamic...

448

MagLab: 45 Tesla Hybrid Magnet - Publications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnets & Facilities > Hybrid Magnet Arrow Publications Featuring Data from the 45 Tesla Hybrid Magnet The hybrid magnet was commissioned in December 1999. Nature, Nature Physics,...

449

NREL: Vehicles and Fuels Research - Hydraulic Hybrid Fleet Vehicle...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hydraulic Hybrid Fleet Vehicle Testing How Hydraulic Hybrid Vehicles Work Hydraulic hybrid systems can capture up to 70% of the kinetic energy that would otherwise be lost during...

450

MagLab - MagLab Dictionary: Hybrid Magnet (Transcript)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hybrid Magnet As explained by Scott Hannahs, DC Facilities & Instrumentation director. Hybrid magnet The lab's world-record 45 tesla hybrid magnet. The premier magnet system at the...

451

NREL: Vehicles and Fuels Research - Hybrid Electric Fleet Vehicle...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hybrid Electric Fleet Vehicle Testing How Hybrid Electric Vehicles Work Hybrid electric vehicles combine a primary power source, an energy storage system, and an electric motor to...

452

Vehicle Technologies Office: Hybrid and Vehicle Systems | Department...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Hybrid and Vehicle Systems Vehicle Technologies Office: Hybrid and Vehicle Systems Hybrid and vehicle systems research provides an overarching vehicle systems perspective to the...

453

Test, Evaluation, and Demonstration of Practical Devices/Systems to Reduce Aerodynamic Drag of Tractor/Semitrailer Combination Unit Trucks  

SciTech Connect (OSTI)

Class 8 heavy-duty trucks account for over three-quarters of the total diesel fuel used by commercial trucks (trucks with GVWRs more than 10,000 pounds) in the United States each year. At the highway speeds at which these trucks travel (i.e., 60 mph or greater), aerodynamic drag is a major part of total horsepower needed to move the truck down the highway, Reductions in aerodynamic drag can yield measurable benefits in fuel economy through the use of relatively inexpensive and simple devices. The goal of this project was to examine a number of aerodynamic drag reduction devices and systems and determine their effectiveness in reducing aerodynamic drag of Class 8 tractor/semitrailer combination-units, thus contributing to DOE's goal of reducing transportation petroleum use. The project team included major heavy truck manufacturers in the United States, along with the management and industry expertise of the Truck Manufacturers Association as the lead investigative organization. The Truck Manufacturers Association (TMA) is the national trade association representing the major North American manufacturers of Class 6-8 trucks (GVWRs over 19,500 lbs). Four major truck manufacturers participated in this project with TMA: Freightliner LLC; International Truck and Engine Corporation; Mack Trucks Inc.; and Volvo Trucks North America, Inc. Together, these manufacturers represent over three-quarters of total Class 8 truck sales in the United States. These four manufacturers pursued complementary research efforts as part of this project. The project work was separated into two phases conducted over a two-year period. In Phase I, candidate aerodynamic devices and systems were screened to focus research and development attention on devices that offered the most potential. This was accomplished using full-size vehicle tests, scale model tests, and computational fluid dynamics analyses. In Phase II, the most promising devices were installed on full-size trucks and their effect on fuel economy was determined, either through on-road testing or full-size wind tunnel testing. All of the manufacturers worked with devices and systems that offer practical solutions to reduce aerodynamic drag, accounting for functionality, durability, cost effectiveness, reliability, and maintainability. The project team members and their roles and responsibilities are shown in Figure 2-1. Figure 2-2 shows the Phase I and II project schedules for all four projects and associated management activities.

Scott Smith; Karla Younessi; Matt Markstaller; Dan Schlesinger; Bhaskar Bhatnagar; Donald Smith; Bruno Banceu; Ron Schoon; V.K. Sharma; Mark Kachmarsky; Srikant Ghantae; Michael Sorrels; Conal Deedy; Justin Clark; Skip Yeakel; Michael D. Laughlin; Charlotte Seigler; Sidney Diamond

2007-04-30T23:59:59.000Z

454

Neutron diagnostics for mirror hybrids  

SciTech Connect (OSTI)

Fusion-fission (FuFi) hybrids will need instrumentation to diagnose the deuteriumtritium plasma, whose 14-MeV neutron emission is the driver of the sub-critical fission core. While the fission neutron yield rate (Y{sub fi} and hence power P{sub fi}) can be monitored with standard instrumentation, fusion plasmas in hybrids require special diagnostics where the determination of Y{sub th} ({proportional_to}P{sub fu}) is a challenge. Information on Y{sub fu} is essential for assessing the fusion plasma performance which together with Y{sub fi} allows for the validation of the neutron multiplication factor (k) of the subcritical fission core. Diagnostics for hybrid plasmas are heuristically discussed with special reference to straight field line mirror (SFLM). Relevant DT plasma experience from JET and plans for ITER in the main line of fusion research were used as input. It is shown that essential SFLM plasma information can potentially be obtained with proposed instrumentation, but the state of the hybrid plasma must be predictably robust as derived from fully diagnosed dedicated experiments without interface restrictions of the hybrid application.

Kaellne, Jan; Noack, Klaus; Agren, Olov; Gorini, Giuseppe; Tardocchi, Marco; Grosso, Giovanni [Department of Engineering Sciences, Uppsala University, Box 256, SE-751 21 Uppsala (Sweden); Universita degli Studi di Milano - Bicocca, Dip. di Fisica 'G. Occhialini', Piazza della Scienza 3, 20126, Milan (Italy)

2012-06-19T23:59:59.000Z

455

Quantified regional and laminar distribution of the noradrenaline innervation in the anterior half of the adult rat cerebral cortex  

SciTech Connect (OSTI)

The regional and laminar distribution of the noradrenaline (NA) innervation in the adult rat cerebral cortex was quantified in radioautographs of semithin sections from whole hemisphere slices incubated with tritiated catecholamines and a monoamine oxidase inhibitor. Uptake-labeled axonal varicosities (aggregates of silver grains) were counted with the help of a computerized image analyzer in seven cytoarchitectonic areas of the rostral half of the cortex: Cg3, rostral AID, Cg2, Fr1, Par1, caudal AID, and Pir (prepiriform) according to Zilles's nomenclature. Both dopamine (DA) and NA terminals were detected after incubation with (3H)DA and citalopram or with (3H)NA alone. In the presence of desipramine (DMI), DA terminals alone were demonstrated; the number of NA terminals was then obtained by subtraction from counts in adjacent slices incubated with or without DMI. These counts suggested that DA and NA varicosities were fully visualized only after labeling with their respective tritiated amine. Similar numbers of labeled NA varicosities as inferred after (3H)NA incubation with or without DMI were observed after (3H)NA incubation in the presence of benztropine (BZ). This indicated that NA terminals were then maximally detected to the exclusion of the DA ones, and the latter approach was adopted for the acquisition of normative data. Since the average diameter of the labeled NA varicosities was known from earlier measurements in electron microscope radioautographs, the initial counts of labeled sites/mm2 of histological section could be expressed as numbers of varicosities/mm3 of tissue following a double correction for incomplete detection at the chosen duration of radioautographic exposure and section thickness.

Audet, M.A.; Doucet, G.; Oleskevich, S.; Descarries, L.

1988-08-15T23:59:59.000Z

456

24th AIAA Applied Aerodynamics Conference, Jun. 5-8, 2006, San Francisco, CA Flight Control of a UAV with Inflatable Wings with  

E-Print Network [OSTI]

24th AIAA Applied Aerodynamics Conference, Jun. 5-8, 2006, San Francisco, CA Flight Control are conceptually possible in almost any size and have been developed with spans as small as 6 inches for missiles

Jacob, Jamey

457

Effects of tone on the three-way laryngeal distinction in Korean: An acoustic and aerodynamic comparison of the Seoul and South Kyungsang dialects  

E-Print Network [OSTI]

KU ScholarWorks | http://kuscholarworks.ku.edu Effects of tone on the three-way laryngeal distinction in Korean: An acoustic and aerodynamic comparison of the Seoul and South Kyungsang dialects by Hyunjung Lee and Allard Jongman KU Scholar... below. Lee, H., and Jongman, A. (2012). Effects of tone on the three-way laryngeal distinction in Korean: An acoustic and aerodynamic comparison of the Seoul and South Kyungsang dialects. Journal of the International Phonetic Association 42, 145...

Lee, Hyunjung; Jongman, Allard

2012-08-01T23:59:59.000Z

458

Hybrid vehicle-centric route guidance  

E-Print Network [OSTI]

This thesis proposes a hybrid route guidance system in which predictive guidance is generated in a centralized layer and revised in a reactive, decentralized layer that resides on-board the vehicle. This hybrid approach ...

Farver, Jennifer M. (Jennifer Margaret), 1976-

2005-01-01T23:59:59.000Z

459

Hybrid solar-fossil fuel power generation  

E-Print Network [OSTI]

In this thesis, a literature review of hybrid solar-fossil fuel power generation is first given with an emphasis on system integration and evaluation. Hybrid systems are defined as those which use solar energy and fuel ...

Sheu, Elysia J. (Elysia Ja-Zeng)

2012-01-01T23:59:59.000Z

460

Advanced Electric Systems and Aerodynamics for Efficiency Improvements in Heavy Duty Trucks  

SciTech Connect (OSTI)

The Advanced Electric Systems and Aerodynamics for Efficiency Improvements in Heavy Duty Trucks program (DE-FC26-04NT42189), commonly referred to as the AES program, focused on areas that will primarily benefit fuel economy and improve heat rejection while driving over the road. The AES program objectives were to: (1) Analyze, design, build, and test a cooling system that provided a minimum of 10 percent greater heat rejection in the same frontal area with no increase in parasitic fan load. (2) Realize fuel savings with advanced power management and acceleration assist by utilizing an integrated starter/generator (ISG) and energy storage devices. (3) Quantify the effect of aerodynamic drag due to the frontal shape mandated by the area required for the cooling system. The program effort consisted of modeling and designing components for optimum fuel efficiency, completing fabrication of necessary components, integrating these components into the chassis test bed, completing controls programming, and performance testing the system both on a chassis dynamometer and on the road. Emission control measures for heavy-duty engines have resulted in increased engine heat loads, thus introducing added parasitic engine cooling loads. Truck electrification, in the form of thermal management, offers technological solutions to mitigate or even neutralize the effects of this trend. Thermal control offers opportunities to avoid increases in cooling system frontal area and forestall reduced fuel economy brought about by additional aerodynamic vehicle drag. This project explored such thermal concepts by installing a 2007 engine that is compliant with current regulations and bears additional heat rejection associated with meeting these regulations. This newer engine replaced the 2002 engine from a previous project that generated less heat rejection. Advanced power management, utilizing a continuously optimized and controlled power flow between electric components, can offer additional fuel economy benefits to the heavy-duty trucking industry. Control software for power management brings added value to the power distribution and energy storage architecture on board a truck with electric accessories and an ISG. The research team has built upon a previous truck electrification project, formally, 'Parasitic Energy Loss Reduction and Enabling Technologies for Class 7/8 Trucks', DE-FC04-2000AL6701, where the fundamental concept of electrically-driven accessories replacing belt/gear-driven accessories was demonstrated on a Kenworth T2000 truck chassis. The electrical accessories, shown in Figure 1, were controlled to provide 'flow on demand' variable-speed operation and reduced parasitic engine loads for increased fuel economy. These accessories also provided solutions for main engine idle reduction in long haul trucks. The components and systems of the current project have been integrated into the same Kenworth T2000 truck platform. Reducing parasitic engine loading by decoupling accessory loads from the engine and driving them electrically has been a central concept of this project. Belt or gear-driven engine accessories, such as water pump, air conditioning compressor, or air compressor, are necessarily tied to the engine speed dictated by the current vehicle operating conditions. These conventional accessory pumps are sized to provide adequate flow or pressure at low idle or peak torque speeds, resulting in excess flow or pressure at cruising or rated speeds. The excess flow is diverted through a pressure-minimizing device such as a relief valve thereby expending energy to drive unnecessary and inefficient pump operation. This inefficiency causes an increased parasitic load to the engine, which leads to a loss of usable output power and decreased fuel economy. Controlling variable-speed electric motors to provide only the required flow or pressure of a particular accessory system can yield significant increases in fuel economy for a commercial vehicle. Motor loads at relatively high power levels (1-5 kW, or higher) can be efficiently provided

Larry Slone; Jeffrey Birkel

2007-10-31T23:59:59.000Z

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Optical Hybrid Quantum Information Processing  

E-Print Network [OSTI]

Historically, two complementary approaches to optical quantum information processing have been pursued: qubits and continuous-variables, each exploiting either particle or wave nature of light. However, both approaches have pros and cons. In recent years, there has been a significant progress in combining both approaches with a view to realizing hybrid protocols that overcome the current limitations. In this chapter, we first review the development of the two approaches with a special focus on quantum teleportation and its applications. We then introduce our recent research progress in realizing quantum teleportation by a hybrid scheme, and mention its future applications to universal and fault-tolerant quantum information processing.

Shuntaro Takeda; Akira Furusawa

2014-04-09T23:59:59.000Z

462

A Hybrid Denotational Semantics for Hybrid Olivier Bouissou and Matthieu Martel  

E-Print Network [OSTI]

A Hybrid Denotational Semantics for Hybrid Systems Olivier Bouissou and Matthieu Martel 1 CEA LIST. In this article, we present a model and a denotational se- mantics for hybrid systems. Our model is designed analysis, or to analyze the whole hybrid system made of the continuous environment and the discrete program

Paris-Sud XI, Université de

463

Hybrid Zones and Sexual Selection 503 HYBRID ZONES AND SEXUAL SELECTION: INSIGHTS FROM  

E-Print Network [OSTI]

Hybrid Zones and Sexual Selection 503 HYBRID ZONES AND SEXUAL SELECTION: INSIGHTS FROM THE AWASH BABOON HYBRID ZONE (Papio hamadryas anubis x P. h. hamadryas) Thore J. Bergman and Jacinta C. Beehner, have focused on the impact of sexual selection on populations of naturally occurring hybrid animals

464

Are hybrid species more fit than ancestral parent species in the current hybrid species habitats?  

E-Print Network [OSTI]

Are hybrid species more fit than ancestral parent species in the current hybrid species habitats? L Columbia, Vancouver, BC, Canada Introduction Hybridization is receiving renewed attention as an important). For homoploid hybridization in plants, where chromosome number remains the same, models and empirical evi- dence

Rieseberg, Loren

465

Quantifying the benefits of hybrid vehicles  

E-Print Network [OSTI]

General Motors Silverado truck is a light hybrid. It replaces the normal flywheel of a gasoline engine

Turrentine, Tom; Delucchi, Mark; Heffner, Reid R.; Kurani, Kenneth S; Sun, Yongling

2006-01-01T23:59:59.000Z

466

Distributed Theorem Proving for Distributed Hybrid Systems  

E-Print Network [OSTI]

system with a varying number of arbitrarily many cars. 1 Introduction Hybrid systems with joint discrete a multi-agent system, e.g., distributed car control systems. Such systems form distributed hybrid systemsDistributed Theorem Proving for Distributed Hybrid Systems David W. Renshaw, Sarah M. Loos

Platzer, Andr

467

Hybrid Ockhamist Temporal Logic Patrick Blackburn  

E-Print Network [OSTI]

Hybrid Ockhamist Temporal Logic Patrick Blackburn INRIA, Lorraine Campus Scientifique, BP 239 Nancy Johannesburg, South Africa vfg@na.rau.ac.za Abstract We introduce hybrid Ockhamist temporal logic, which combines the mechanisms of hybrid logic with Ockhamist semantics by employing nominals, satisfaction

Goranko, Valentin

468

Hybrid Model Structures Aaron David Ames  

E-Print Network [OSTI]

Hybrid Model Structures by Aaron David Ames B.A. (University of St. Thomas) 2001 B.S. (University of California, Berkeley Fall 2006 #12;Hybrid Model Structures Copyright 2006 by Aaron David Ames #12;Abstract Hybrid Model Structures by Aaron David Ames Masters of Arts in Mathematics University of California

Ames, Aaron

469

Hybrid organicinorganic materials for photonic applications  

E-Print Network [OSTI]

Hybrid organic­inorganic materials for photonic applications Partha P. Banerjee,1,* Dean R. Evans,2 18015, USA *pbanerjee1@udayton.edu Abstract: This novel joint feature issue on "Hybrid organic that this feature issue encourages and stimulates further research to into hybrid materials with enhanced linear

Gilchrist, James F.

470

Hybrid Diverter Sheath Model Jeff Hammel  

E-Print Network [OSTI]

Hybrid Diverter Sheath Model Jeff Hammel Plasma Theory and Simulation Group APS ­ Division using a particle-fluid hybrid model. Electrons are modeled as an inertia-less (Boltzmann) fluid gyrokinetic code. The modeling methodology for the iterative nonlinear solver is presented. The hybrid model

Wurtele, Jonathan

471

Hybrid Signcryption Schemes With Outsider Security  

E-Print Network [OSTI]

Hybrid Signcryption Schemes With Outsider Security (Extended Abstract) Alexander W. Dent.dent@rhul.ac.uk Abstract. This paper expands the notion of a KEM­DEM hybrid en- cryption scheme to the signcryption setting by introducing the notion of a signcryption KEM, a signcryption DEM and a hybrid signcryption scheme. We present

Dent, Alexander W.

472

Copyright 2013 Gaia Geothermal, LLC 1Hybrid Design Slide 1.1 -Hybrid Design with the New GLD  

E-Print Network [OSTI]

Copyright © 2013 ­ Gaia Geothermal, LLC 1Hybrid Design ­ Slide 1.1 - Hybrid Design Geothermal, LLC 2Hybrid Design ­ Slide 1.1 - The new hybrid design tool in GLD provides: · Precision peak;Copyright © 2013 ­ Gaia Geothermal, LLC 3Hybrid Design ­ Slide 1.1 - In previous versions of GLD, the hybrid

473

Hybrid mesons and auxiliary fields  

E-Print Network [OSTI]

Hybrid mesons are exotic mesons in which the color field is not in the ground state. Their understanding deserves interest from a theoretical point of view, because it is intimately related to nonperturbative aspects of QCD. Moreover, it seems that some recently detected particles, such as the $\\pi_1(1600)$ and the Y(4260), are serious hybrid candidates. In this work, we investigate the description of such exotic hadrons by applying the auxiliary fields technique to the widely used spinless Salpeter Hamiltonian with appropriate linear confinement. Instead of the usual numerical resolution, this technique allows to find simplified analytical mass spectra and wave functions of the Hamiltonian, which still lead to reliable qualitative predictions. We analyse and compare two different descriptions of hybrid mesons, namely a two-body $q\\bar q$ system with an excited flux tube, or a three-body $q\\bar q g$ system. We also compute the masses of the $1^{-+}$ hybrids. Our results are shown to be in satisfactory agreement with lattice QCD and other effective models.

Fabien Buisseret; Vincent Mathieu

2006-07-07T23:59:59.000Z

474

Inflow Characterization and Aerodynamics Measurements on a SWT-2.3-101 Wind Turbine  

SciTech Connect (OSTI)

Post processing techniques for aerodynamic data acquired from a Siemens SWT-2.3101 turbine have been developed and applied in this paper. The turbine is installed at the National Wind Technology Center (NWTC) as part of Cooperative Research and Development Agreement between Siemens Wind Power and the National Renewable Energy Laboratory (NREL) under U.S. Department of Energy (DOE) sponsorship. The results indicate that the use of these corrections is essential for accurate analysis of the data. An example of local inflow angles, velocities, and inflow velocity over the rotor plane derived from measurements from a 5-hole probe is also presented. Finally, the pressure measurements are used to characterize unsteady phenomenon, namely, rotational augmentation and dynamic stall on an inboard station. The results show that the rotational augmentation can considerably increase the attached flow regime compared to the 2D Computational Fluid Dynamics (CFD) results. The dynamic stall event was seen to significantly delay the stall. Furthermore, the non-dimensionalized vortex convection derived from the dynamic stall event was found to agree well with results from others studies.

Medina, P.; Singh, M.; Johansen, J.; Jove, A. R.; Fingersh, L.; Schreck, S.

2012-01-01T23:59:59.000Z

475

Preliminary Measurements From A New Flat Plate Facility For Aerodynamic Research  

SciTech Connect (OSTI)

This paper details the design and preliminary measurements used in the characterisation of a new flat plate research facility. The facility is designed specifically to aid in the understanding of entropy generation throughout the boundary layer with special attention given to non-equilibrium flows. Hot-wire measurements were obtained downstream of two turbulence generating grids. The turbulence intensity, integral and dissipation length scale ranges measured are 1.6%-7%, 5mm-17mm and 0.7mm-7mm, respectively. These values compared well to existing correlations. The flow downstream of both grids was found to be homogenous and isotropic. Flow visualisation is employed to determine aerodynamic parameters such as flow 2-dimensionality and the effect of the flap angle on preventing separation at the leading edge. The flow was found to be 2-dimensional over all measurement planes. The non-dimensional pressure distribution of a modern turbine blade suction surface is simulated on the flat plate through the use of a variable upper wall. The Reynolds number range based on wetted plate length and inlet velocity is 70,000-4,000,000.

D. M. McEligot; D. W. Nigg; E. J. Walsh; D. Hernon; M.R.D. Davies

2005-03-01T23:59:59.000Z

476

Inflow Characterization and Aerodynamics Measurements on a SWT-2.3-101 Wind Turbine: Preprint  

SciTech Connect (OSTI)

Post processing techniques for aerodynamic data acquired from a Siemens SWT-2.3-101 turbine have been developed and applied in this paper. The turbine is installed at the National Wind Technology Center (NWTC) as part of Cooperative Research And Development Agreement between Siemens Wind Power and the National Renewable Energy Laboratory (NREL) under U.S. Department of Energy (DOE) sponsorship. The results indicate that the use of these corrections is essential for accurate analysis of the data. An example of local inflow angles, velocities, and inflow velocity over the rotor plane derived from measurements from a 5-hole probe is also presented. Finally the pressure measurements are used to characterize unsteady phenomenon, namely, rotational augmentation and dynamic stall on an inboard station. The results show that the rotational augmentation can considerably increase the attached flow regime compared to the 2D CFD results. The dynamic stall event was seen to significantly delay the stall. Furthermore, the nondimensionalized vortex convection derived from the dynamic stall event was found to agree well with results from others studies.

Medina, P.; Singh, M.; Johansen, J.; Jove, A.; Fingersh, L.; Schreck, S.

2012-01-01T23:59:59.000Z

477

Effect of lift force on the aerodynamics of dust grains in the protoplanetary disk  

E-Print Network [OSTI]

We newly introduce lift force into the aerodynamics of dust grains in the protoplanetary disk. Although many authors have so far investigated the effects of the drag force, gravitational force and electric force on the dust grains, the lift force has never been considered as a force exerted on the dust grains in the gas disk. If the grains are spinning and moving in the fluid, then the lift force is exerted on them. We show in this paper that the dust grains can be continuously spinning due to the frequent collisions so that the lift force continues to be exerted on them, which is valid in a certain parameter space where the grain size is larger than ~ 1 m and where the distance from the central star is larger than 1 AU for the minimum mass solar nebula. In addition, we estimate the effects of the force on the grain motion and obtain the result that the mean relative velocity between the grains due to the lift force is comparable to the gas velocity in the Kepler rotational frame when the Stokes number and li...

Yamaguchi, Masaki S

2014-01-01T23:59:59.000Z

478

Rather than resonance, flapping wing flyers may play on aerodynamics to improve performance  

E-Print Network [OSTI]

Saving energy and enhancing performance are secular preoccupations shared by both nature and human beings. In animal locomotion, flapping flyers or swimmers rely on the flexibility of their wings or body to passively increase their efficiency using an appropriate cycle of storing and releasing elastic energy. Despite the convergence of many observations pointing out this feature, the underlying mechanisms explaining how the elastic nature of the wings is related to propulsive efficiency remain unclear. Here we use an experiment with a self-propelled simplified insect model allowing to show how wing compliance governs the performance of flapping flyers. Reducing the description of the flapping wing to a forced oscillator model, we pinpoint different nonlinear effects that can account for the observed behavior ---in particular a set of cubic nonlinearities coming from the clamped-free beam equation used to model the wing and a quadratic damping term representing the fluid drag associated to the fast flapping motion. In contrast to what has been repeatedly suggested in the literature, we show that flapping flyers optimize their performance not by especially looking for resonance to achieve larger flapping amplitudes with less effort, but by tuning the temporal evolution of the wing shape (i.e. the phase dynamics in the oscillator model) to optimize the aerodynamics.

Sophie Ramananarivo; Ramiro Godoy-Diana; Benjamin Thiria

2011-08-29T23:59:59.000Z

479

DOE Laminar Final Report  

Office of Scientific and Technical Information (OSTI)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary)morphinan antagonist Journal Article: Crystal structureComposite-- Energy,Converting to5994DOE AwardFinal

480

E-Print Network 3.0 - anisotropic goal-oriented mesh Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Sciences 4 Error estimation and anisotropic mesh refinement for 3d laminar aerodynamic flow simulations Summary: be employed to drive a goal-oriented adaptive mesh...

Note: This page contains sample records for the topic "aerodynamics hybrid laminar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Planar slot coupled microwave hybrid  

DOE Patents [OSTI]

A symmetrical 180.degree. microwave hybrid is constructed by opening a slot line in a ground plane below a conducting strip disposed on a dielectric substrate, creating a slot coupled conductor. Difference signals propagating on the slot coupled conductor are isolated on the slot line leaving sum signals to propagate on the microstrip. The difference signal is coupled from the slot line onto a second microstrip line for transmission to a desired location. The microstrip branches in a symmetrical fashion to provide the input/output ports of the 180.degree. hybrid. The symmetry of the device provides for balance and isolation between sum and difference signals, and provides an advantageous balance between the power handling capabilities and the bandwidth of the device.

Petter, Jeffrey K. (Williston, VT)

1991-01-01T23:59:59.000Z

482

Hybrid Inflation Exit through Tunneling  

E-Print Network [OSTI]

For hybrid inflationary potentials, we derive the tunneling rate from field configurations along the flat direction towards the waterfall regime. This process competes with the classically rolling evolution of the scalar fields and needs to be strongly subdominant for phenomenologically viable models. Tunneling may exclude models with a mass scale below 10^12 GeV, but can be suppressed by small values of the coupling constants. We find that tunneling is negligible for those models, which do not require fine tuning in order to cancel radiative corrections, in particular for GUT-scale SUSY inflation. In contrast, electroweak scale hybrid inflation is not viable, unless the inflaton-waterfall field coupling is smaller than approximately 10^-11.

Bjorn Garbrecht; Thomas Konstandin

2006-10-24T23:59:59.000Z

483

Witnessing entanglement in hybrid systems  

E-Print Network [OSTI]

We extend the definition of entanglement witnesses based on structure factors to the case in which the position of the scatterers is quantized. This allows us to study entanglement detection in hybrid systems. We provide several examples that show how these extra degrees of freedom affect the detection of entanglement by directly contributing to the measurement statistics. We specialize the proposed witness operators for a chain of trapped ions. Within this framework, we show how the collective vibronic state of the chain can act as an undesired quantum environment and how ions quantum motion can affect the entanglement detection. Finally, we investigate some specific cases where the method proposed leads to detection of hybrid entanglement.

Massimo Borrelli; Matteo Rossi; Chiara Macchiavello; Sabrina Maniscalco

2014-04-24T23:59:59.000Z

484

Hybrid quantum repeater with encoding  

E-Print Network [OSTI]

We present an encoded hybrid quantum repeater scheme using qubit-repetition and Calderbank-Shor-Steane codes. For the case of repetition codes, we propose an explicit implementation of the quantum error-correction protocol. Moreover, we analyze the entangled-pair distribution rate for the hybrid quantum repeater with encoding and we clearly identify a triple trade-off between the efficiency of the codes, the memory decoherence time, and the local gate errors. Finally, we show that in the presence of reasonable imperfections our system can achieve rates of roughly 24 Hz per memory for 20 km repeater spacing, a final distance of 1280 km, and a final fidelity of about 0.95.

Nadja K. Bernardes; Peter van Loock

2011-05-18T23:59:59.000Z

485

Computer Aided Design Tool for Electric, Hybrid Electric and Plug-in Hybrid Electric Vehicles  

E-Print Network [OSTI]

This research is focused on designing a new generation of CAD tools that could help a hybrid vehicle designer with the design process to come up with better vehicle configurations. The conventional design process for any type of hybrid...

Eskandari Halvaii, Ali

2012-07-16T23:59:59.000Z

486

Hybrid States from Constituent Glue Model  

E-Print Network [OSTI]

The hybrid meson is one of the most interesting new hadron specie beyond the naive quark model. It acquire a great attention both from the theoretical and experimental efforts. Many good candidates have been claimed to be observed, but there is no absolute confirmation about existence of hybrid mesons. In the present work we propose new calculations of the masses and decay widths of the hybrid mesons in the context of constituent gluon model.

F. Iddir; L. Semlala

2007-10-29T23:59:59.000Z

487

Quantifying the benefits of hybrid vehicles  

E-Print Network [OSTI]

gasoline or diesel with electric motors that use electricityadditional power from an electric motor. Future designs maypower plant and larger electric motor. Hybrid technology is

Turrentine, Tom; Delucchi, Mark; Heffner, Reid R.; Kurani, Kenneth S; Sun, Yongling

2006-01-01T23:59:59.000Z

488

Plug-In Hybrid Electric Vehicles (Presentation)  

SciTech Connect (OSTI)

Provides an overview on the current status, long-term prospects, and key challenges in the development of plug-in hybrid electric vehicle technology.

Markel, T.

2006-05-08T23:59:59.000Z

489

A verification framework for hybrid systems  

E-Print Network [OSTI]

Combining; discrete state transitions with differential equations, Hybrid system models provide an expressive formalism for describing software systems that interact with a physical environment. Automatically checking ...

Mitra, Sayan

2007-01-01T23:59:59.000Z

490

Hybrid LP/SDP Bounding Procedure  

E-Print Network [OSTI]

Hybrid LP/SDP Bounding Procedure. Fabio Furini1 and Emiliano Traversi2. 1 LIPN, Universit Paris 13, 93430 Villetaneuse, France.

2012-10-24T23:59:59.000Z

491

Hybrid Rotaxanes: Interlocked Structures for Quantum Computing...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Hybrid Rotaxanes: Interlocked Structures for Quantum Computing? Print Rotaxanes are mechanically interlocked molecular architectures consisting of a dumbbell-shaped molecule, the...

492

Hybrid Performance of the Pierre Auger Observatory  

E-Print Network [OSTI]

A key feature of the Pierre Auger Observatory is its hybrid design, in which ultra high energy cosmic rays are detected simultaneously by fluorescence telescopes and a ground array. The two techniques see air showers in complementary ways, providing important cross-checks and measurement redundancy. Much of the hybrid capability stems from the accurate geometrical reconstruction it achieves, with accuracy better than either the ground array detectors or a single telescope could achieve independently. We have studied the geometrical and longitudinal profile reconstructions of hybrid events. We present the results for the hybrid performance of the Observatory, including trigger efficiency, energy and angular resolution, and the efficiency of the event selection.

B. R. Dawson; for the Pierre Auger Collaboration

2007-06-08T23:59:59.000Z

493

Hybrid extragradient proximal algorithm coupled with parametric ...  

E-Print Network [OSTI]

In this paper we study the hybrid extragradient method coupled with approximation and penalty schemes for minimization problems. Under certain hypotheses...

494

Hybrid slab-microchannel gel electrophoresis system  

DOE Patents [OSTI]

A hybrid slab-microchannel gel electrophoresis system. The hybrid system permits the fabrication of isolated microchannels for biomolecule separations without imposing the constraint of a totally sealed system. The hybrid system is reusable and ultimately much simpler and less costly to manufacture than a closed channel plate system. The hybrid system incorporates a microslab portion of the separation medium above the microchannels, thus at least substantially reducing the possibility of non-uniform field distribution and breakdown due to uncontrollable leakage. A microslab of the sieving matrix is built into the system by using plastic spacer materials and is used to uniformly couple the top plate with the bottom microchannel plate.

Balch, Joseph W. (Livermore, CA); Carrano, Anthony V. (Livermore, CA); Davidson, James C. (Livermore, CA); Koo, Jackson C. (San Ramon, CA)

1998-01-01T23:59:59.000Z

495

Impact of SiC Devices on Hybrid Electric and Plug-in Hybrid Electric Vehicles  

E-Print Network [OSTI]

Impact of SiC Devices on Hybrid Electric and Plug-in Hybrid Electric Vehicles Hui Zhang1 , Leon M -- The application of SiC devices (as battery interface, motor controller, etc.) in a hybrid electric vehicle (HEV, vehicle simulation software). Power loss models of a SiC inverter are incorporated into PSAT powertrain

Tolbert, Leon M.

496

MODELING, VERIFICATION AND OPTIMIZATION OF HYBRID GROUND SOURCE HEAT PUMP  

E-Print Network [OSTI]

MODELING, VERIFICATION AND OPTIMIZATION OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS IN ENERGYPLUS, VERIFICATION AND OPTIMIZATION OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS IN ENERGYPLUS Thesis Approved by: Dr.................................................................................................................... 16 MODELING OF HYBRID GROUND SOURCE HEAT PUMP SYSTEMS IN ENERGYPLUS

497

Fact #849: December 1, 2014 Midsize Hybrid Cars Averaged 51%...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

9: December 1, 2014 Midsize Hybrid Cars Averaged 51% Better Fuel Economy than Midsize Non-Hybrid Cars in 2014 Fact 849: December 1, 2014 Midsize Hybrid Cars Averaged 51% Better...

498

Ultracapacitor Technologies and Application in Hybrid and Electric Vehicles  

E-Print Network [OSTI]

Power Battery for Hybrid Vehicle Applications. ProceedingsAF. Electric and Hybrid Vehicle Design and Performance.A, Thornton M. Plug-in Hybrid Vehicle Analysis. NREL/MP-540-

Burke, Andy

2009-01-01T23:59:59.000Z

499

Are Batteries Ready for Plug-in Hybrid Buyers?  

E-Print Network [OSTI]

M. (2006) Plug-In Hybrid Vehicle Analysis, Milestone Report,gas emissions from plug-in hybrid vehicles: Implications forPresentation at SAE 2008 Hybrid Vehicle Technologies

Axsen, Jonn; Kurani, Kenneth S; Burke, Andy

2009-01-01T23:59:59.000Z

500

Are batteries ready for plug-in hybrid buyers?  

E-Print Network [OSTI]

M. (2006) Plug-In Hybrid Vehicle Analysis, Milestone Report,gas emissions from plug-in hybrid vehicles: Implications forPresentation at SAE 2008 Hybrid Vehicle Technologies

Axsen, Jonn; Kurani, Kenneth S.; Burke, Andrew

2008-01-01T23:59:59.000Z