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Sample records for rotor tip-speed ratio-the

  1. Effect of Tip-Speed Constraints on the Optimized Design of a Wind Turbine

    SciTech Connect (OSTI)

    Dykes, K.; Resor, B.; Platt, A.; Guo, Y.; Ning, A.; King, R.; Parsons, T.; Petch, D.; Veers, P.

    2014-10-01

    This study investigates the effect of tip-velocity constraints on system levelized cost of energy (LCOE). The results indicate that a change in maximum tip speed from 80 to 100~m/s could produce a 32% decrease in gearbox weight (a 33% reduction in cost) which would result in an overall reduction of 1%-9% in system LCOE depending on the design approach. Three 100~m/s design cases were considered including a low tip-speed ratio/high-solidity rotor design, a high tip-speed ratio/ low-solidity rotor design, and finally a flexible blade design in which a high tip-speed ratio was used along with removing the tip deflection constraint on the rotor design. In all three cases, the significant reduction in gearbox weight caused by the higher tip-speed and lower overall gear ratio was counterbalanced by increased weights for the rotor and/or other drivetrain components and the tower. As a result, the increased costs of either the rotor or drivetrain components offset the overall reduction in turbine costs from down-sizing the gearbox. Other system costs were not significantly affected, whereas energy production was slightly reduced in the 100~m/s case low tip-speed ratio case and increased in the high tip-speed ratio case. This resulted in system cost of energy reductions moving from the 80~m/s design to the 100~m/s designs of 1.2% for the low tip-speed ratio, 4.6% for the high tip-speed ratio, and 9.5% for the final flexible case (the latter result is optimistic because the impact of deflection of the flexible blade on power production was not modeled). Overall, the results demonstrate that there is a trade-off in system design between the maximum tip velocity and the overall wind plant cost of energy, and there are many trade-offs within the overall system in designing a turbine for a high maximum tip velocity.

  2. File:Tip-top-tip-speed-teacher.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages RecentTempCampApplicationWorksheet 2011.pdf Jump to:Tip-top-tip-speed-teacher.pdf

  3. File:Tip Speed Lesson Plan.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAESRAPID ToolkitTip Speed Lesson Plan.pdf

  4. File:Tip-top-tip-speed-lp-HS.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAESRAPID ToolkitTip Speed Lesson

  5. File:Tip-top-tip-speed-student-HS.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAESRAPID ToolkitTip Speed

  6. Separators for flywheel rotors

    DOE Patents [OSTI]

    Bender, Donald A. (Dublin, CA); Kuklo, Thomas C. (Oakdale, CA)

    1998-01-01

    A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors.

  7. Separators for flywheel rotors

    DOE Patents [OSTI]

    Bender, D.A.; Kuklo, T.C.

    1998-07-07

    A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors. 10 figs.

  8. Sandia Energy - SMART Rotor Video

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

    SMART Rotor Video Home Stationary Power Energy Conversion Efficiency Wind Energy Resources Wind Energy Publications Online Abstracts and Reports SMART Rotor Video SMART Rotor...

  9. Sandia Energy - National Rotor Testbed Rotor Design Integrated...

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

    Results Home Renewable Energy Energy SWIFT Facilities News Wind Energy News & Events Systems Analysis Computational Modeling & Simulation National Rotor Testbed Rotor Design...

  10. Sandia Energy - Rotor Aerodynamic Design

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

    Aerodynamic Design Home Stationary Power Energy Conversion Efficiency Wind Energy Rotor Innovation Rotor Aerodynamic Design Rotor Aerodynamic DesignTara Camacho-Lopez2015-05-28T16:...

  11. Single Rotor Turbine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2004-10-26

    A rotor for use in turbine applications has a centrifugal compressor having axially disposed spaced apart fins forming passages and an axial turbine having hollow turbine blades interleaved with the fins and through which fluid from the centrifugal compressor flows.

  12. Sandia Energy - Rotor Blade Sensors and Instrumentation

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

    Blade Sensors and Instrumentation Home Stationary Power Energy Conversion Efficiency Wind Energy Rotor Innovation Rotor Blade Sensors and Instrumentation Rotor Blade Sensors and...

  13. Polygonal shaft hole rotor

    DOE Patents [OSTI]

    Hussey, John H. (St. Louis, MO); Rose, John Scott (Alton, IL); Meystrik, Jeffrey J. (Webster Groves, MO); White, Kent Lee (Maryland Heights, MO)

    2001-01-23

    A laminated rotor for an induction motor has a plurality of ferro-magnetic laminations mounted axially on a rotor shaft. Each of the plurality of laminations has a central aperture in the shape of a polygon with sides of equal length. The laminations are alternatingly rotated 180.degree. from one another so that the straight sides of the polygon shaped apertures are misaligned. As a circular rotor shaft is press fit into a stack of laminations, the point of maximum interference occurs at the midpoints of the sides of the polygon (i.e., at the smallest radius of the central apertures of the laminations). Because the laminates are alternatingly rotated, the laminate material at the points of maximum interference yields relatively easily into the vertices (i.e., the greatest radius of the central aperture) of the polygonal central aperture of the next lamination as the shaft is inserted into the stack of laminations. Because of this yielding process, the amount of force required to insert the shaft is reduced, and a tighter fit is achieved.

  14. Single rotor turbine engine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2002-01-01

    There has been invented a turbine engine with a single rotor which cools the engine, functions as a radial compressor, pushes air through the engine to the ignition point, and acts as an axial turbine for powering the compressor. The invention engine is designed to use a simple scheme of conventional passage shapes to provide both a radial and axial flow pattern through the single rotor, thereby allowing the radial intake air flow to cool the turbine blades and turbine exhaust gases in an axial flow to be used for energy transfer. In an alternative embodiment, an electric generator is incorporated in the engine to specifically adapt the invention for power generation. Magnets are embedded in the exhaust face of the single rotor proximate to a ring of stationary magnetic cores with windings to provide for the generation of electricity. In this alternative embodiment, the turbine is a radial inflow turbine rather than an axial turbine as used in the first embodiment. Radial inflow passages of conventional design are interleaved with radial compressor passages to allow the intake air to cool the turbine blades.

  15. Homopolar motor with dual rotors

    DOE Patents [OSTI]

    Hsu, J.S.

    1998-12-01

    A homopolar motor has a field rotor mounted on a frame for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor mounted for rotation on said frame within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor. The two rotors are coupled through a 1:1 gearing mechanism, so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed. 7 figs.

  16. Die Casting Copper Motor Rotors

    Broader source: Energy.gov [DOE]

    Though it conducts electricity less efficiently than copper, aluminum is the industry’s preferred fabrication material in electric induction motor rotors. Traditional tool steel casting molds...

  17. Wind turbine rotor aileron

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT)

    1994-06-14

    A wind turbine has a rotor with at least one blade which has an aileron which is adjusted by an actuator. A hinge has two portions, one for mounting a stationary hinge arm to the blade, the other for coupling to the aileron actuator. Several types of hinges can be used, along with different actuators. The aileron is designed so that it has a constant chord with a number of identical sub-assemblies. The leading edge of the aileron has at least one curved portion so that the aileron does not vent over a certain range of angles, but vents if the position is outside the range. A cyclic actuator can be mounted to the aileron to adjust the position periodically. Generally, the aileron will be adjusted over a range related to the rotational position of the blade. A method for operating the cyclic assembly is also described.

  18. Abstract--This paper proposes a methodology to decide the optimal matching between the size of the rotor of a wind turbine

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the rotor of a wind turbine and the rated power of a permanent magnet synchronous machine. This is made of the wind turbine, the gearbox's transformation ratio, the battery voltage and the wind speed probability's rated power and the wind turbine's rotor size. The system studied in this paper consists of 220 (V)/50

  19. Rotor assembly and assay method

    DOE Patents [OSTI]

    Burtis, Carl A. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Walker, William A. (Knoxville, TN)

    1993-01-01

    A rotor assembly for carrying out an assay includes a rotor body which is rotatable about an axis of rotation, and has a central chamber and first, second, third, fourth, fifth, and sixth chambers which are in communication with and radiate from the central chamber. The rotor assembly further includes a shuttle which is movable through the central chamber and insertable into any of the chambers, the shuttle including a reaction cup carrying an immobilized antigen or an antibody for transport among the chambers. A method for carrying out an assay using the rotor assembly includes moving the reaction cup among the six chambers by passing the cup through the central chamber between centrifugation steps in order to perform the steps of: separating plasma from blood cells, binding plasma antibody or antigen, washing, drying, binding enzyme conjugate, reacting with enzyme substrate and optically comparing the resulting reaction product with unreacted enzyme substrate solution. The movement of the reaction cup can be provided by attaching a magnet to the reaction cup and supplying a moving magnetic field to the rotor.

  20. Rotor assembly and assay method

    DOE Patents [OSTI]

    Burtis, C.A.; Johnson, W.F.; Walker, W.A.

    1993-09-07

    A rotor assembly for carrying out an assay includes a rotor body which is rotatable about an axis of rotation, and has a central chamber and first, second, third, fourth, fifth, and sixth chambers which are in communication with and radiate from the central chamber. The rotor assembly further includes a shuttle which is movable through the central chamber and insertable into any of the chambers, the shuttle including a reaction cup carrying an immobilized antigen or an antibody for transport among the chambers. A method for carrying out an assay using the rotor assembly includes moving the reaction cup among the six chambers by passing the cup through the central chamber between centrifugation steps in order to perform the steps of: separating plasma from blood cells, binding plasma antibody or antigen, washing, drying, binding enzyme conjugate, reacting with enzyme substrate and optically comparing the resulting reaction product with unreacted enzyme substrate solution. The movement of the reaction cup can be provided by attaching a magnet to the reaction cup and supplying a moving magnetic field to the rotor. 34 figures.

  1. Probabilistic analysis of meanline compressor rotor performance

    E-Print Network [OSTI]

    Fitzgerald, Nathan Andrew, 1980-

    2004-01-01

    This thesis addresses variability in aerodynamic performance of a compressor rotor due to geometric variation. The performance of the rotor is computed using a meanline model that includes the effect of tip clearance ...

  2. Voith High Efficiency HM Rotor Energy Data, A Repulper Rotor Design Case Study 

    E-Print Network [OSTI]

    Aue, J.; Fineran, B.

    2005-01-01

    blade (HOG rotor) 2. A new conventional repulping blade of the same style (spare HOG rotor) 3. A new energy efficient repulping blade (HM rotor) The HM rotor, a tall, swept-back blade design, has been engineered to provide effective turbulence...

  3. Rotor for centrifugal fast analyzers

    DOE Patents [OSTI]

    Lee, N.E.

    1984-01-01

    The invention is an improved photometric analyzer of the rotary cuvette type, the analyzer incorporating a multicuvette rotor of novel design. The rotor (a) is leaktight, (b) permits operation in the 90/sup 0/ and 180/sup 0/ excitation modes, (c) is compatible with extensively used Centrifugal Fast Analyzers, and (d) can be used thousands of times. The rotor includes an assembly comprising a top plate, a bottom plate, and a central plate, the rim of the central plate being formed with circumferentially spaced indentations. A uv-transmitting ring is sealably affixed to the indented rim to define with the indentations an array of cuvettes. The ring serves both as a sealing means and an end window for the cuvettes.

  4. Rotor for centrifugal fast analyzers

    DOE Patents [OSTI]

    Lee, Norman E. (Knoxville, TN)

    1985-01-01

    The invention is an improved photometric analyzer of the rotary cuvette type, the analyzer incorporating a multicuvette rotor of novel design. The rotor (a) is leaktight, (b) permits operation in the 90.degree. and 180.degree. excitation modes, (c) is compatible with extensively used Centrifugal Fast Analyzers, and (d) can be used thousands of times. The rotor includes an assembly comprising a top plate, a bottom plate, and a central plate, the rim of the central plate being formed with circumferentially spaced indentations. A UV-transmitting ring is sealably affixed to the indented rim to define with the indentations an array of cuvettes. The ring serves both as a sealing means and an end window for the cuvettes.

  5. Turbomachine rotor with improved cooling

    DOE Patents [OSTI]

    Hultgren, Kent Goran (Winter Park, FL); McLaurin, Leroy Dixon (Winter Springs, FL); Bertsch, Oran Leroy (Titusville, FL); Lowe, Perry Eugene (Oviedo, FL)

    1998-01-01

    A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn.

  6. Turbomachine rotor with improved cooling

    DOE Patents [OSTI]

    Hultgren, K.G.; McLaurin, L.D.; Bertsch, O.L.; Lowe, P.E.

    1998-05-26

    A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn. 5 figs.

  7. Rotor blades for turbine engines

    SciTech Connect (OSTI)

    Piersall, Matthew R; Potter, Brian D

    2013-02-12

    A tip shroud that includes a plurality of damping fins, each damping fin including a substantially non-radially-aligned surface that is configured to make contact with a tip shroud of a neighboring rotor blade. At least one damping fin may include a leading edge damping fin and at least one damping fin may include a trailing edge damping fin. The leading edge damping fin may be configured to correspond to the trailing edge damping fin.

  8. Rotary engine with inserts in rotor faces

    SciTech Connect (OSTI)

    Jones, C.

    1992-06-23

    This patent describes a rotor for a rotary combustion engine. It comprises a plurality of circumferentially spaced apex portions, a plurality of working surfaces extending between adjacent apex portions, each working surface having a recess formed therein, and an insulating plate for each recess, characterized by: a slot formed in the rotor adjacent one end of each recess, the rotor having a lip which radially separates each slot from the working surface; and one end of each plate being rigidly fixed to the rotor and a second end of each plate being slidably received in a corresponding one of the slots.

  9. Method for manufacturing a rotor having superconducting coils

    DOE Patents [OSTI]

    Driscoll, David I. (South Euclid, OH); Shoykhet, Boris A. (Beachwood, OH)

    2001-01-01

    A method and apparatus for manufacturing a rotor for use with a rotating machine is provided that employs a superconducting coil on the rotor. An adhesive is applied to an outer surface of the rotor body, which may include a groove disposed within an outer surface of the rotor body. A superconducting coil is then mounted onto the rotor body such that the adhesive bonds the superconducting coil to the rotor body.

  10. Multiple piece turbine rotor blade

    DOE Patents [OSTI]

    Jones, Russell B; Fedock, John A

    2013-05-21

    A multiple piece turbine rotor blade with a shell having an airfoil shape and secured between a spar and a platform with the spar including a tip end piece. a snap ring fits around the spar and abuts against the spar tip end piece on a top side and abuts against a shell on the bottom side so that the centrifugal loads from the shell is passed through the snap ring and into the spar and not through a tip cap dovetail slot and projection structure.

  11. Radial-radial single rotor turbine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2006-05-16

    A rotor for use in turbine applications has a radial compressor/pump having radially disposed spaced apart fins forming passages and a radial turbine having hollow turbine blades interleaved with the fins and through which fluid from the radial compressor/pump flows. The rotor can, in some applications, be used to produce electrical power.

  12. Substantially parallel flux uncluttered rotor machines

    DOE Patents [OSTI]

    Hsu, John S.

    2012-12-11

    A permanent magnet-less and brushless synchronous system includes a stator that generates a magnetic rotating field when sourced by polyphase alternating currents. An uncluttered rotor is positioned within the magnetic rotating field and is spaced apart from the stator. An excitation core is spaced apart from the stator and the uncluttered rotor and magnetically couples the uncluttered rotor. The brushless excitation source generates a magnet torque by inducing magnetic poles near an outer peripheral surface of the uncluttered rotor, and the stator currents also generate a reluctance torque by a reaction of the difference between the direct and quadrature magnetic paths of the uncluttered rotor. The system can be used either as a motor or a generator

  13. SW 55 Ti ROTOR Used In Beckman Coulter

    E-Print Network [OSTI]

    Marchant, Jonathan

    SW 55 Ti ROTOR Used In Beckman Coulter Class H, R, and S Preparative Ultracentrifuges FPO L5-TB-062M August 2006 © 2006 Beckman Coulter, Inc. Printed in the U.S.A. #12;2 SW 55 Ti Rotor SAFETY NOTICE made by other manufacturers may fit in the SW 55 Ti rotor, their safety in this rotor cannot

  14. Vacuum coupling of rotating superconducting rotor

    DOE Patents [OSTI]

    Shoykhet, Boris A.; Zhang, Burt Xudong; Driscoll, David Infante

    2003-12-02

    A rotating coupling allows a vacuum chamber in the rotor of a superconducting electric motor to be continually pumped out. The coupling consists of at least two concentric portions, one of which is allowed to rotate and the other of which is stationary. The coupling is located on the non-drive end of the rotor and is connected to a coolant supply and a vacuum pump. The coupling is smaller in diameter than the shaft of the rotor so that the shaft can be increased in diameter without having to increase the size of the vacuum seal.

  15. Wind turbine rotor hub and teeter joint

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT); Jankowski, Joseph (Stowe, VT)

    1994-10-11

    A rotor hub is provided for coupling a wind turbine rotor blade and a shaft. The hub has a yoke with a body which is connected to the shaft, and extension portions which are connected to teeter bearing blocks, each of which has an aperture. The blocks are connected to a saddle which envelops the rotor blade by one or two shafts which pass through the apertures in the bearing blocks. The saddle and blade are separated by a rubber interface which provides for distribution of stress over a larger portion of the blade. Two teeter control mechanisms, which may include hydraulic pistons and springs, are connected to the rotor blade and to the yoke at extension portions. These control mechanisms provide end-of-stroke damping, braking, and stiffness based on the teeter angle and speed of the blade.

  16. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, S.E.; Deteresa, S.J.

    1998-07-14

    An interlayer toughening mechanism is described to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0{degree} to 90{degree} to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles. 2 figs.

  17. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, Scott E. (Brentwood, CA); Deteresa, Steven J. (Livermore, CA)

    1998-01-01

    An interlayer toughening mechanism to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0.degree. to 90.degree. to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles.

  18. Cooperative Self-Propulsion of Active and Passive Rotors

    E-Print Network [OSTI]

    Yaouen Fily; Aparna Baskaran; M. Cristina Marchetti

    2011-10-26

    Using minimal models for low Reynolds number passive and active rotors in a fluid, we characterize the hydrodynamic interactions among rotors and the resulting dynamics of a pair of interacting rotors. This allows us to treat in a common framework passive or externally driven rotors, such as magnetic colloids driven by a rotating magnetic field, and active or internally driven rotors, such as sperm cells confined at boundaries. The hydrodynamic interaction of passive rotors is known to contain an azimuthal component \\sim 1/r^2 to dipolar order that can yield the recently discovered "cooperative self-propulsion" of a pair of rotors of opposite vorticity. While this interaction is identically zero for active rotors as a consequence of torque balance, we show that a \\sim 1/r^4 azimuthal component of the interaction arises in active systems to octupolar order. Cooperative self-propulsion, although weaker, can therefore also occur for pairs of active rotors.

  19. The cost of noise reduction in commercial tilt rotor aircraft

    E-Print Network [OSTI]

    Faulkner, Henry B.

    1974-01-01

    The relationship between direct operating cost and departure noise annoyance was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt rotor aircraft designs to meet various ...

  20. Variable diameter wind turbine rotor blades

    DOE Patents [OSTI]

    Jamieson, Peter McKeich; Hornzee-Jones, Chris; Moroz, Emilian M.; Blakemore, Ralph W.

    2005-12-06

    A system and method for changing wind turbine rotor diameters to meet changing wind speeds and control system loads is disclosed. The rotor blades on the wind turbine are able to adjust length by extensions nested within or containing the base blade. The blades can have more than one extension in a variety of configurations. A cable winching system, a hydraulic system, a pneumatic system, inflatable or elastic extensions, and a spring-loaded jack knife deployment are some of the methods of adjustment. The extension is also protected from lightning by a grounding system.

  1. Dynamics and Fatigue Damage of Wind Turbine Rotors

    E-Print Network [OSTI]

    6 3 RiS0-Rr512 Dynamics and Fatigue Damage of Wind Turbine Rotors during Steady Operation Peter OF WIND TURBINE ROTORS DURING STEADY OPERATION Peter Hauge Madsen, Sten Frandsen, William E. Holley-carrying capacity of a wind turbine rotor with respect to short-term strength and material fatigue are presented

  2. Rotor bore and turbine rotor wheel/spacer heat exchange flow circuit

    DOE Patents [OSTI]

    Caruso, Philip M. (Selkirk, NY); Eldrid, Sacheverel Quentin (Saratoga Springs, NY); Ladhani, Azad A. (Niskayuna, NY); DeMania, Alan Richard (Niskayuna, NY); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY); Rathbun, Lisa Shirley (Scotia, NY); Akin, Robert Craig (Schenectady, NY)

    2002-01-01

    In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.

  3. Aeroelastic analysis of a helicopter rotor 

    E-Print Network [OSTI]

    McQuien, Larry Jay

    1977-01-01

    for a heli- copter rotor in hover. The objective of this analysis was to ascertain the sensitivity of the flutter speed with regard to the type of unsteady aerodynamic theory used in conjunction with the analysis. The two aerodynamic theories used... of the Potential Flow Equation Two-Dimensional Flow . . . . . . . . . . . . . . . . . . 11 Three-Dimensional Flow . . . . . . . . . . . . . . . . . 14 Summary of Aerodynamic Theories . . . . . . . . . . . . . 18 III FLUTTER THEORY...

  4. High-speed synchronous reluctance machine with minimized rotor losses

    SciTech Connect (OSTI)

    Hofmann, H.; Sanders, S.R.

    2000-04-01

    This paper presents a refined design of a high-speed synchronous reluctance machine with minimized eddy-current losses in the rotor. Design criteria are the ability of the rotor to withstand high speeds, ability to operate in vacuum, negligible zero-torque spinning losses, high reliability, high efficiency, and low manufacturing cost. The rotor of the synchronous reluctance machine consists of bonded sections of ferromagnetic and non-magnetic steels. Finite-element code, incorporating rotor rotation, has been developed in MATLAB that calculates steady-state eddy currents (and losses) in the rotor. A stator iron and stator winding have been designed to minimize rotor losses, and two such prototype machines have been fabricated. Experimental results show an efficiency of 91% at a 10-kW 10,000-r/min operating point, and rotor losses less than 0.5% of input power.

  5. Non-equilibrium steady states for chains of four rotors

    E-Print Network [OSTI]

    Noé Cuneo; Jean-Pierre Eckmann

    2015-04-20

    We study a chain of four interacting rotors (rotators) connected at both ends to stochastic heat baths at different temperatures. We show that for non-degenerate interaction potentials the system relaxes, at a stretched exponential rate, to a non-equilibrium steady state (NESS). Rotors with high energy tend to decouple from their neighbors due to fast oscillation of the forces. Because of this, the energy of the central two rotors, which interact with the heat baths only through the external rotors, can take a very long time to dissipate. By appropriately averaging the oscillatory forces, we estimate the dissipation rate and construct a Lyapunov function. Compared to the chain of length three (considered previously by C. Poquet and the current authors), the new difficulty with four rotors is the apparition of resonances when both central rotors are fast. We deal with these resonances using the rapid thermalization of the two external rotors.

  6. Utilization of rotor kinetic energy storage for hybrid vehicles

    DOE Patents [OSTI]

    Hsu, John S. (Oak Ridge, TN)

    2011-05-03

    A power system for a motor vehicle having an internal combustion engine, the power system comprises an electric machine (12) further comprising a first excitation source (47), a permanent magnet rotor (28) and a magnetic coupling rotor (26) spaced from the permanent magnet rotor and at least one second excitation source (43), the magnetic coupling rotor (26) also including a flywheel having an inertial mass to store kinetic energy during an initial acceleration to an operating speed; and wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor (26) exerts torque on the permanent magnet rotor (28) to assist braking and acceleration of the permanent magnet rotor (28) and consequently, the vehicle. An axial gap machine and a radial gap machine are disclosed and methods of the invention are also disclosed.

  7. Electrofriction method of manufacturing squirrel cage rotors

    DOE Patents [OSTI]

    Hsu, John S.

    2005-04-12

    A method of making a squirrel cage rotor of copper material for use in AC or DC motors, includes forming a core with longitudinal slots, inserting bars of conductive material in the slots, with ends extending out of opposite ends of the core, and joining the end rings to the bars, wherein the conductive material of either the end rings or the bars is copper. Various methods of joining the end rings to the bars are disclosed including electrofriction welding, current pulse welding and brazing, transient liquid phase joining and casting. Pressure is also applied to the end rings to improve contact and reduce areas of small or uneven contact between the bar ends and the end rings. Rotors made with such methods are also disclosed.

  8. Horizontal wind rotor. Final technical report

    SciTech Connect (OSTI)

    Guard, E.J.

    1983-06-30

    A vertical axis wind machine called, ''Horizontal Wind Rotor'' conceived in 1979 by the Grantee E.J. Guard was an effort to marry a new high tech carousel type wind rotor to a basic building design for the purpose of generating practical amounts of electricty. This was directed especially towards high performance power generation, relative to low average wind velocity fields, typically found in Florida. From January 1980 to April 1983 two 1/30 scale wind tunnel type test models of buildings, one round and one square were built. An eight Hartzell shrouded wind tunnel fan machine was designed and built to supply uniform wind velocities for testing. All components of the Horizontal Wind Rotor (HWR) were fabricated, instrumented, mounted on the building models, and tested and modified repeatedly for performance optimization. Aerodynamic consultants, model makers, mechanical and computer engineers and technicians under the direction of E. Guard all teamed up to evolve the size, shape, and placement of the system components. It was recognized early that the machine had to be large in order to extract energy from low wind velocities. It was also noted that there were so many variables in the system, so as to elude analytical computation, that only testing could provide the answers. Consequently, this grant program has provided major contributions to the sparse available data in this little studied field, and set up valuable bench marks in design and power output parameters. This data will be the foundation for incorporating the newly discovered design improvements into the full scale prototype to follow. (Phase II) It is believed that this Rotor design is the only one in the world today that will produce as much power in the lower wind velocity ranges and it is also believed that every objective of the original grant proposal has been met or exceeded.

  9. Rotor assembly and method for automatically processing liquids

    DOE Patents [OSTI]

    Burtis, C.A.; Johnson, W.F.; Walker, W.A.

    1992-12-22

    A rotor assembly is described for performing a relatively large number of processing steps upon a sample, such as a whole blood sample, and a diluent, such as water. It includes a rotor body for rotation about an axis and includes a network of chambers within which various processing steps are performed upon the sample and diluent and passageways through which the sample and diluent are transferred. A transfer mechanism is movable through the rotor body by the influence of a magnetic field generated adjacent the transfer mechanism and movable along the rotor body, and the assembly utilizes centrifugal force, a transfer of momentum and capillary action to perform any of a number of processing steps such as separation, aliquoting, transference, washing, reagent addition and mixing of the sample and diluent within the rotor body. The rotor body is particularly suitable for automatic immunoassay analyses. 34 figs.

  10. Rotor assembly and method for automatically processing liquids

    DOE Patents [OSTI]

    Burtis, Carl A. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Walker, William A. (Knoxville, TN)

    1992-01-01

    A rotor assembly for performing a relatively large number of processing steps upon a sample, such as a whole blood sample, and a diluent, such as water, includes a rotor body for rotation about an axis and including a network of chambers within which various processing steps are performed upon the sample and diluent and passageways through which the sample and diluent are transferred. A transfer mechanism is movable through the rotor body by the influence of a magnetic field generated adjacent the transfer mechanism and movable along the rotor body, and the assembly utilizes centrifugal force, a transfer of momentum and capillary action to perform any of a number of processing steps such as separation, aliquoting, transference, washing, reagent addition and mixing of the sample and diluent within the rotor body. The rotor body is particularly suitable for automatic immunoassay analyses.

  11. Rotor for processing liquids using movable capillary tubes

    DOE Patents [OSTI]

    Johnson, W.F.; Burtis, C.A.; Walker, W.A.

    1987-07-17

    A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described. 5 figs.

  12. Sandia Energy - Structural and Mechanical Adaptive Rotor Technology...

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

    and Mechanical Adaptive Rotor Technology (SMART) Final Project Reports Published Home Renewable Energy Energy News Wind Energy News & Events Systems Analysis Structural and...

  13. Sandia Energy - National Rotor Testbed Functional Scaling Presented...

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

    show magnitude of velocity deficit. Results of Vortex Method analysis of SWiFT rotor design. Colors show magnitude of velocity deficit. David Maniaci (in Sandia's Wind Energy...

  14. Ultra-Micro Wave Rotor Investigations Florin Iancu, Janusz Piechna*

    E-Print Network [OSTI]

    Müller, Norbert

    , and CFD models, the wave rotor compression efficiency at microfabrication scale could be estimated, pumps, but also electric generators, heat exchangers, internal combustion engines and rocket engines

  15. Integral twist actuation of helicolpter rotor blades for vibration reduction

    E-Print Network [OSTI]

    Shin, SangJoon, 1967-

    2001-01-01

    Active integral twist control for vibration reduction of helicopter rotors during forward flight is investigated. The twist deformation is obtained using embedded anisotropic piezocomposite actuators. An analytical framework ...

  16. Mechanical coupling for a rotor shaft assembly of dissimilar materials

    DOE Patents [OSTI]

    Shi, Jun (Glastonbury, CT); Bombara, David (New Hartford, CT); Green, Kevin E. (Broad Brook, CT); Bird, Connic (Rocky Hill, CT); Holowczak, John (South Windsor, CT)

    2009-05-05

    A mechanical coupling for coupling a ceramic disc member to a metallic shaft includes a first wedge clamp and a second wedge clamp. A fastener engages a threaded end of a tie-bolt to sandwich the ceramic disc between the wedge clamps. An axial spring is positioned between the fastener and the second wedge clamp to apply an axial preload along the longitudinal axis. Another coupling utilizes a rotor shaft end of a metallic rotor shaft as one wedge clamp. Still another coupling includes a solid ceramic rotor disc with a multiple of tie-bolts radially displaced from the longitudinal axis to exert the preload on the solid ceramic rotor disc.

  17. Control of an Active Magnetic Bearing-Rotor System

    E-Print Network [OSTI]

    Kang, Christopher

    2014-01-01

    Active Magnetic Bearing-RotorRotation of Magnetic Bearing. ” Precision Engineering, 27(and Control of a Magnetic Bearing System. ” In American

  18. Interface structure for hub and mass attachment in flywheel rotors

    DOE Patents [OSTI]

    Deteresa, S.J.; Groves, S.E.

    1998-06-02

    An interface structure is described for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is comprised of high-strength fiber, such as glass and carbon, woven into an angle pattern which is about 45{degree} with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material which is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning. 2 figs.

  19. Turbulence ingestion noise of open rotors

    E-Print Network [OSTI]

    Robison, Rosalyn Aruna Venner

    2012-04-10

    the propfan. 2Higher speeds would be desirable for long-haul flights. The conventional turboprop, a close relative of the open rotor, only delivers efficiency savings when travelling below Mach 0.6, although advanced turboprops do exceed this. 5 6 1... frequency (both of which are different for the propfan and the turbofan) affect annoyance levels (McCurdy, 1990). Tonal noise is usually perceived as more irritating by the human ear than broadband, and frequencies within the range 2-6 kHz are perceived...

  20. Ener G Rotors | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX E LISTStar2-0057-EA Jump to:of theClimateElgin,Wind UK Jump to:Rotors Jump to:

  1. INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight

    E-Print Network [OSTI]

    design. In order to capture the above physical phenomena, the influence of the inflow, blade dynamics1 CHAPTER I INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight The prediction of rotor blade. Shock induced separation and shock motion along the chord of the blade may occur. Because the inboard

  2. COMPARATIVE MATERIALS EVALUTION FOR A GAS TURBINE ROTOR

    E-Print Network [OSTI]

    Pennycook, Steve

    COMPARATIVE MATERIALS EVALUTION FOR A GAS TURBINE ROTOR 27th Annual Conference on Composites: microturbine, silicon nitride, turbine, CARES, recuperator, ceramic, gas turbine, life analysis #12;COMPARATIVE MATERIALS EVALUTION FOR A GAS TURBINE ROTOR Kesseli et. al Ingersoll-Rand's Ceramic Microturbine (CMT) Plan

  3. Effects of increasing tip velocity on wind turbine rotor design.

    SciTech Connect (OSTI)

    Resor, Brian Ray; Maniaci, David Charles; Berg, Jonathan Charles; Richards, Phillip William

    2014-05-01

    A reduction in cost of energy from wind is anticipated when maximum allowable tip velocity is allowed to increase. Rotor torque decreases as tip velocity increases and rotor size and power rating are held constant. Reduction in rotor torque yields a lighter weight gearbox, a decrease in the turbine cost, and an increase in the capacity for the turbine to deliver cost competitive electricity. The high speed rotor incurs costs attributable to rotor aero-acoustics and system loads. The increased loads of high speed rotors drive the sizing and cost of other components in the system. Rotor, drivetrain, and tower designs at 80 m/s maximum tip velocity and 100 m/s maximum tip velocity are created to quantify these effects. Component costs, annualized energy production, and cost of energy are computed for each design to quantify the change in overall cost of energy resulting from the increase in turbine tip velocity. High fidelity physics based models rather than cost and scaling models are used to perform the work. Results provide a quantitative assessment of anticipated costs and benefits for high speed rotors. Finally, important lessons regarding full system optimization of wind turbines are documented.

  4. Determination of Rotor Temperature for an Interior Permanent Magnet Synchronous

    E-Print Network [OSTI]

    Noé, Reinhold

    of the magnet material monitoring its temperature also helps to increase the accuracy of the estimated torque [1Determination of Rotor Temperature for an Interior Permanent Magnet Synchronous Machine Using@lea.upb.de, boecker@lea.upb.de Abstract--In this paper an enhanced method to de- termine the rotor temperature

  5. SMART wind turbine rotor. Design and field test

    SciTech Connect (OSTI)

    Berg, Jonathan Charles; Resor, Brian Ray; Paquette, Joshua A.; White, Jonathan Randall

    2014-01-01

    The Wind Energy Technologies department at Sandia National Laboratories has developed and field tested a wind turbine rotor with integrated trailing-edge flaps designed for active control of rotor aerodynamics. The SMART Rotor project was funded by the Wind and Water Power Technologies Office of the U.S. Department of Energy (DOE) and was conducted to demonstrate active rotor control and evaluate simulation tools available for active control research. This report documents the design, fabrication, and testing of the SMART Rotor. This report begins with an overview of active control research at Sandia and the objectives of this project. The SMART blade, based on the DOE / SNL 9-meter CX-100 blade design, is then documented including all modifications necessary to integrate the trailing edge flaps, sensors incorporated into the system, and the fabrication processes that were utilized. Finally the test site and test campaign are described.

  6. SMART wind turbine rotor. Data analysis and conclusions

    SciTech Connect (OSTI)

    Berg, Jonathan Charles; Barone, Matthew Franklin; Yoder, Nathanael C.

    2014-01-01

    The Wind Energy Technologies department at Sandia National Laboratories has developed and field tested a wind turbine rotor with integrated trailing-edge flaps designed for active control of the rotor aerodynamics. The SMART Rotor project was funded by the Wind and Water Power Technologies Office of the U.S. Department of Energy (DOE) and was conducted to demonstrate active rotor control and evaluate simulation tools available for active control research. This report documents the data post-processing and analysis performed to date on the field test data. Results include the control capability of the trailing edge flaps, the combined structural and aerodynamic damping observed through application of step actuation with ensemble averaging, direct observation of time delays associated with aerodynamic response, and techniques for characterizing an operating turbine with active rotor control.

  7. Rotor and bearing system for a turbomachine

    DOE Patents [OSTI]

    Lubell, Daniel; Weissert, Dennis

    2006-09-26

    A rotor and bearing system for a turbomachine. The turbomachine includes a drive shaft, an impeller positioned on the drive shaft, and a turbine positioned on the drive shaft proximate to the impeller. The bearing system comprises one gas journal bearing supporting the drive shaft between the impeller and the turbine. The area between the impeller and the turbine is an area of increased heat along the drive shaft in comparison to other locations along the drive shaft. The section of the drive shaft positioned between impeller and the turbine is also a section of the drive shaft that experiences increased stressed and load in the turbomachine. The inventive bearing machine system positions only one radial bearing in this area of increased stress and load.

  8. Tip cap for a turbine rotor blade

    DOE Patents [OSTI]

    Kimmel, Keith D

    2014-03-25

    A turbine rotor blade with a spar and shell construction, and a tip cap that includes a row of lugs extending from a bottom side that form dovetail grooves that engage with similar shaped lugs and grooves on a tip end of the spar to secure the tip cap to the spar against radial displacement. The lug on the trailing edge end of the tip cap is aligned perpendicular to a chordwise line of the blade in the trailing edge region in order to minimize stress due to the lugs wanting to bend under high centrifugal loads. A two piece tip cap with lugs at different angles will reduce the bending stress even more.

  9. Double-rotor rotary engine and turbine

    SciTech Connect (OSTI)

    Lin, A.S.

    1990-04-03

    This patent describes a double-rotor engine. It comprises: a base; a housing rotatably mounted to the base and forming a radial cylinder; an output shaft rotatably mounted concentric with the housing and having an arm rigidly extending therefrom within the housing; a piston slidingly engaging the cylinder and forming a combustion chamber with the cylinder; means for admitting a fuel-air mixture into the cylinder; means for releasing combustion products from the cylinder following operation of the expanding means; turbine means operatively connected between the base and the housing, the turbine means providing a torque reaction against the housing in response to flow of the combustion products from the releasing means; and stop means on the shaft for limiting the relative movement between the shaft and the housing.

  10. Synchronization and Collective Dynamics in a Carpet of Microfluidic Rotors

    E-Print Network [OSTI]

    Nariya Uchida; Ramin Golestanian

    2010-04-28

    We study synchronization of an array of rotors on a substrate that are coupled by hydrodynamic interaction. The rotors that are modeled by an effective rigid body, are driven by an internal torque and exerts an active force on the surrounding fluid. The long-ranged nature of the hydrodynamic interaction between the rotors causes a rich pattern of dynamical behaviors including phase ordering and turbulent spiral waves. The model provides a novel example of coupled oscillators with long-range interaction. Our results suggest strategies for designing controllable microfluidic mixers using the emergent behavior of hydrodynamically coupled active components.

  11. Control coil arrangement for a rotating machine rotor

    DOE Patents [OSTI]

    Shah, Manoj R. (Latham, NY); Lewandowsk, Chad R. (Amsterdam, NY)

    2001-07-31

    A rotating machine (e.g., a turbine, motor or generator) is provided wherein a fixed solenoid or other coil configuration is disposed adjacent to one or both ends of the active portion of the machine rotor for producing an axially directed flux in the active portion so as to provide planar axial control at single or multiple locations for rotor balance, levitation, centering, torque and thrust action. Permanent magnets can be used to produce an axial bias magnetic field. The rotor can include magnetic disks disposed in opposed, facing relation to the coil configuration.

  12. Methods and apparatus for rotor blade ice detection

    DOE Patents [OSTI]

    LeMieux, David Lawrence

    2006-08-08

    A method for detecting ice on a wind turbine having a rotor and one or more rotor blades each having blade roots includes monitoring meteorological conditions relating to icing conditions and monitoring one or more physical characteristics of the wind turbine in operation that vary in accordance with at least one of the mass of the one or more rotor blades or a mass imbalance between the rotor blades. The method also includes using the one or more monitored physical characteristics to determine whether a blade mass anomaly exists, determining whether the monitored meteorological conditions are consistent with blade icing; and signaling an icing-related blade mass anomaly when a blade mass anomaly is determined to exist and the monitored meteorological conditions are determined to be consistent with icing.

  13. SMART Wind Turbine Rotor: Design and Field Test

    SciTech Connect (OSTI)

    Berg, Jonathan C.; Resor, Brian R.; Paquette, Joshua A.; White, Jonathan R.

    2014-01-29

    This report documents the design, fabrication, and testing of the SMART Rotor. This work established hypothetical approaches for integrating active aerodynamic devices (AADs) into the wind turbine structure and controllers.

  14. Lean implementation across value stream in main rotor blade area

    E-Print Network [OSTI]

    Phoenix, Casey J. (Casey John)

    2007-01-01

    The primary goal for this project was to help expand the existing capability of Sikorsky's main rotor blade business from raw material (titanium) through final assembly. The project helped to facilitate the ongoing lean ...

  15. Methods and apparatus for rotor load control in wind turbines

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw

    2006-08-22

    A wind turbine having a rotor, at least one rotor blade, and a plurality of generators, of which a first generator is configured to provide power to an electric grid and a second generator is configured to provide power to the wind turbine during times of grid loss. The wind turbine is configured to utilize power provided by the second generator to reduce loads on the wind turbine during times of grid loss.

  16. Entanglement in the states of the Two-Rotor-Model

    E-Print Network [OSTI]

    Palumbo, Fabrizio

    2015-01-01

    The eigenfunctions of the Two-Rotors Model are superpositions of states corresponding to precessions of the rotors around two orthogonal axes. In Nuclear Physics such an entanglement has not been directly confirmed. We discuss how it might be observed and compare with the application of the TRM to single domain nanoparticles. In the latter case, in addition to the present indirect evidence there is the possibility of direct observation in experiments at temperatures of the order of 1 K.

  17. Rigid-rotor, field-reversed configuration

    SciTech Connect (OSTI)

    Conti, F., E-mail: conti@df.unipi.it; Giammanco, F. [Physics Department “E. Fermi,” University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa (Italy) [Physics Department “E. Fermi,” University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa (Italy); Plasma Diagnostics and Technologies Ltd., Via Giuntini 63, 56023 Navacchio (PI) (Italy); Wessel, F. J.; Binderbauer, M. W.; Bolte, N.; Morehouse, M.; Qerushi, A.; Rahman, H. U.; Roche, T.; Slepchenkov, M. [Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688 (United States)] [Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688 (United States)

    2014-02-15

    The radial profiles, n(r), B{sub z}(r), and E{sub r}(r), for a Flux-Coil (“inductively driven”), Field-Reversed Configuration (FC-FRC) are measured and compared to the predictions of the Rigid-Rotor Model (RRM), which is an analytic, one-dimensional, time-independent, equilibrium description for the FRC. Injectors mounted on both ends of the confinement vessel provide a pre-fill plasma. Coaxial coils mounted outside the vacuum boundaries of the annular-confinement vessel accelerate the plasma and produce the FRC. The density profile is measured by laser interferometry, the magnetic-field profile using an in-situ probe array, and the electric-field profile using an in-situ, floating-probe array. Free parameters for each profile are measured, which also allow other intrinsic-plasma parameters to be determined, using computer-fit algorithms: null radius, radial thickness, plasma temperature, rotation frequencies, the latter of which are independently verified by spectroscopy. All radial profiles agree with the RRM predictions, for the experimental configuration, parameter regime, and specified-time interval studied here.

  18. Hi-Q Rotor - Low Wind Speed Technology

    SciTech Connect (OSTI)

    Todd E. Mills; Judy Tatum

    2010-01-11

    The project objective was to optimize the performance of the Hi-Q Rotor. Early research funded by the California Energy Commission indicated the design might be advantageous over state-of-the-art turbines for collecting wind energy in low wind conditions. The Hi-Q Rotor is a new kind of rotor targeted for harvesting wind in Class 2, 3, and 4 sites, and has application in areas that are closer to cities, or 'load centers.' An advantage of the Hi-Q Rotor is that the rotor has non-conventional blade tips, producing less turbulence, and is quieter than standard wind turbine blades which is critical to the low-wind populated urban sites. Unlike state-of-the-art propeller type blades, the Hi-Q Rotor has six blades connected by end caps. In this phase of the research funded by DOE's Inventions and Innovation Program, the goal was to improve the current design by building a series of theoretical and numeric models, and composite prototypes to determine a best of class device. Development of the rotor was performed by aeronautical engineering and design firm, DARcorporation. From this investigation, an optimized design was determined and an 8-foot diameter, full-scale rotor was built and mounted using a Bergey LX-1 generator and furling system which were adapted to support the rotor. The Hi-Q Rotor was then tested side-by-side against the state-of-the-art Bergey XL-1 at the Alternative Energy Institute's Wind Test Center at West Texas State University for six weeks, and real time measurements of power generated were collected and compared. Early wind tunnel testing showed that the cut-in-speed of the Hi-Q rotor is much lower than a conventional tested HAWT enabling the Hi-Q Wind Turbine to begin collecting energy before a conventional HAWT has started spinning. Also, torque at low wind speeds for the Hi-Q Wind Turbine is higher than the tested conventional HAWT and enabled the wind turbine to generate power at lower wind speeds. Based on the data collected, the results of our first full-scale prototype wind turbine proved that higher energy can be captured at lower wind speeds with the new Hi-Q Rotor. The Hi-Q Rotor is almost 15% more productive than the Bergey from 6 m/s to 8 m/s, making it ideal in Class 3, 4, and 5 wind sites and has application in the critical and heretofore untapped areas that are closer to cities, 'load centers,' and may even be used directly in urban areas. The additional advantage of the Hi-Q Rotor's non-conventional blade tips, which eliminates most air turbulence, is noise reduction which makes it doubly ideal for populated urban areas. Hi-Q Products recommends one final stage of development to take the Hi-Q Rotor through Technology Readiness Levels 8-9. During this stage of development, the rotor will be redesigned to further increase efficiency, match the rotor to a more suitable generator, and lower the cost of manufacturing by redesigning the structure to allow for production in larger quantities at lower cost. Before taking the rotor to market and commercialization, it is necessary to further optimize the performance by finding a better generator and autofurling system, ones more suitable for lower wind speeds and rpms should be used in all future testing. The potential impact of this fully developed technology will be the expansion and proliferation of energy renewal into the heretofore untapped Class 2, 3, 4, and 5 Wind Sites, or the large underutilized sites where the wind speed is broken by physical features such as mountains, buildings, and trees. Market estimates by 2011, if low wind speed technology can be developed are well above: 13 million homes, 675,000 commercial buildings, 250,000 public facilities. Estimated commercial exploitation of the Hi-Q Rotor show potential increase in U.S. energy gained through the clean, renewable wind energy found in low and very low wind speed sites. This new energy source would greatly impact greenhouse emissions as well as the public sector's growing energy demands.

  19. Notes 05. Dynamics of a simple rotor-fluid film bearing system 

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01

    Equations of motion of a rigid rotor. The concept of force coefficients. Derivation of stiffness and damping coefficients for the short bearing. Stability analysis and the effect of cross-coupled stiffness. Effect of rotor flexibility on stability...

  20. Method and apparatus for assembling permanent magnet rotors

    DOE Patents [OSTI]

    Hsu, J.S.; Adams, D.J.

    1999-06-22

    A permanent magnet assembly for assembly in large permanent magnet motors and generators includes a two-piece carrier that can be slid into a slot in the rotor and then secured in place using a set screw. The invention also provides an auxiliary carrier device with guide rails that line up with the teeth of the rotor, so that a permanent magnet assembly can be pushed first into a slot, and then down the slot to its proper location. An auxiliary tool is provided to move the permanent magnet assembly into position in the slot before it is secured in place. Methods of assembling and disassembling the magnet assemblies in the rotor are also disclosed. 2 figs.

  1. Method and apparatus for assembling permanent magnet rotors

    DOE Patents [OSTI]

    Hsu, John S. (Oak Ridge, TN); Adams, Donald J. (Knoxville, TN)

    1999-01-01

    A permanent magnet assembly (22) for assembly in large permanent magnet (PM) motors and generators includes a two-piece carrier (23, 24) that can be slid into a slot (13) in the rotor (10) and then secured in place using a set screw (37). The invention also provides an auxiliary carrier device (50) with guide rails (51) that line up with the teeth (12) of the rotor, so that a permanent magnet assembly (22) can be pushed first into a slot (13), and then down the slot (13) to its proper location. An auxiliary tool (50) is provided to move the permanent magnet assembly (22) into position in the slot (13) before it is secured in place. Methods of assembling and disassembling the magnet assemblies (22) in the rotor (10) are also disclosed.

  2. Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight

    E-Print Network [OSTI]

    Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight of ducted rotors in low-power, near-edgewise flow conditions are not well understood. Motivated by phenomena was initiated to use CFD to improve the understanding of the dynamic relationship between ducted rotor thrust

  3. Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine

    E-Print Network [OSTI]

    Hu, Hui

    Numerical Investigation of Aerodynamic Performance and Loads of a Novel Dual Rotor Wind Turbine-rotor wind turbine (DRWT) proposed by Rosenberg et al.1 Assuming that the turbine operates in isolation. Comparisons are drawn with the corresponding analyses of a com- parable conventional single-rotor wind turbine

  4. DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES

    E-Print Network [OSTI]

    Boyer, Edmond

    DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES burdens of wind turbines. To detect damage of rotor blades, several research projects focus on an acoustic, rotor blade, wind turbine INTRODUCTION There are several publications of non destructive damage

  5. Dynamic Response of a Rotor-air Bearing System Due to Base Induced Periodic Motions 

    E-Print Network [OSTI]

    Niu, Yaying

    2010-01-14

    , the base motion frequencies (5-12 Hz) are low respective to the operating speed of the rotor-bearing system. Rotor speed coast down tests evidence the rotor-bearing system natural frequency when the gas bearings are supplied with feed pressures increasing...

  6. Preliminary Design Procedure for Gas TurbineTopping Reverse-Flow Wave Rotors

    E-Print Network [OSTI]

    Müller, Norbert

    of wave energy exchange and proposed a wave rotor design for aircraft turbofan engines (Taussig, 1984.S. Navy expressed interest and sponsored programs to develop an understanding of wave rotor technology. Many developments were presented in the 1985 ONR/NAVAIR Wave Rotor Research and Technology Workshop

  7. SMART Wind Turbine Rotor: Data Analysis and Conclusions

    SciTech Connect (OSTI)

    Berg, Jonathan C.; Barone, Matthew F.; Yoder, Nathanael C.

    2014-01-29

    This report documents the data post-processing and analysis performed to date on the field test data. Results include the control capability of the trailing edge flaps, the combined structural and aerodynamic damping observed through application of step actuation with ensemble averaging, direct observation of time delays associated with aerodynamic response, and techniques for characterizing an operating turbine with active rotor control.

  8. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-Print Network [OSTI]

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

  9. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-Print Network [OSTI]

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters and providing longer turbine life GE's unique electronics provide transmission efficiencies and enable harmonious function within the local grid Allows wind turbines to stay on line generating power, even during

  10. Passive aeroelastic tailoring of wind turbine blades : a numerical analysis

    E-Print Network [OSTI]

    Deilmann, Christian

    2009-01-01

    This research aims to have an impact towards a sustainable energy supply. In wind power generation losses occur at tip speed ratios which the rotor was not designed for. Since the ideal blade shape changes nonlinearly with ...

  11. Sweep-twist adaptive rotor blade : final project report.

    SciTech Connect (OSTI)

    Ashwill, Thomas D.

    2010-02-01

    Knight & Carver was contracted by Sandia National Laboratories to develop a Sweep Twist Adaptive Rotor (STAR) blade that reduced operating loads, thereby allowing a larger, more productive rotor. The blade design used outer blade sweep to create twist coupling without angled fiber. Knight & Carver successfully designed, fabricated, tested and evaluated STAR prototype blades. Through laboratory and field tests, Knight & Carver showed the STAR blade met the engineering design criteria and economic goals for the program. A STAR prototype was successfully tested in Tehachapi during 2008 and a large data set was collected to support engineering and commercial development of the technology. This report documents the methodology used to develop the STAR blade design and reviews the approach used for laboratory and field testing. The effort demonstrated that STAR technology can provide significantly greater energy capture without higher operating loads on the turbine.

  12. Adaptor assembly for coupling turbine blades to rotor disks

    DOE Patents [OSTI]

    Garcia-Crespo, Andres Jose; Delvaux, John McConnell

    2014-09-23

    An adaptor assembly for coupling a blade root of a turbine blade to a root slot of a rotor disk is described. The adaptor assembly includes a turbine blade having a blade root and an adaptor body having an adaptor root. The adaptor body defines a slot having an open end configured to receive the blade root of the turbine blade such that the adaptor root of the adaptor body and the blade root of the turbine blade are adjacent to one another when the blade root of the turbine blade is positioned within the slot. Both the adaptor root of the adaptor body and the blade root of the turbine blade are configured to be received within the root slot of the rotor disk.

  13. Aeroacoustics and aerodynamic performance of a rotor with flatback airfoils.

    SciTech Connect (OSTI)

    Paquette, Joshua A.; Barone, Matthew Franklin; Christiansen, Monica; Simley, Eric

    2010-06-01

    The aerodynamic performance and aeroacoustic noise sources of a rotor employing flatback airfoils have been studied in field test campaign and companion modeling effort. The field test measurements of a sub-scale rotor employing nine meter blades include both performance measurements and acoustic measurements. The acoustic measurements are obtained using a 45 microphone beamforming array, enabling identification of both noise source amplitude and position. Semi-empirical models of flatback airfoil blunt trailing edge noise are developed and calibrated using available aeroacoustic wind tunnel test data. The model results and measurements indicate that flatback airfoil noise is less than drive train noise for the current test turbine. It is also demonstrated that the commonly used Brooks, Pope, and Marcolini model for blunt trailing edge noise may be over-conservative in predicting flatback airfoil noise for wind turbine applications.

  14. Preform spar cap for a wind turbine rotor blade

    DOE Patents [OSTI]

    Livingston, Jamie T. (Simpsonville, SC); Driver, Howard D. (Greer, SC); van Breugel, Sjef (Enschede, NL); Jenkins, Thomas B. (Cantonment, FL); Bakhuis, Jan Willem (Nijverdal, NL); Billen, Andrew J. (Daarlerveen, NL); Riahi, Amir (Pensacola, FL)

    2011-07-12

    A spar cap for a wind turbine rotor blade. The spar cap may include multiple preform components. The multiple preform components may be planar sheets having a swept shape with a first end and a second end. The multiple preform components may be joined by mating the first end of a first preform component to the second end of a next preform component, forming the spar cap.

  15. Blade platform seal for ceramic/metal rotor assembly

    DOE Patents [OSTI]

    Wertz, John L. (Indianapolis, IN)

    1982-01-01

    A combination ceramic and metal turbine rotor for use in high temperature gas turbine engines includes a metal rotor disc having a rim with a plurality of circumferentially spaced blade root retention slots therein to receive a plurality of ceramic blades, each including side platform segments thereon and a dovetail configured root slidably received in one of the slots. Adjacent ones of the platform segments including edge portions thereon closely spaced when the blades are assembled to form expansion gaps in an annular flow surface for gas passage through the blades and wherein the assembly further includes a plurality of unitary seal members on the rotor connected to its rim and each including a plurality of spaced, axially extending, flexible fingers that underlie and conform to the edge portions of the platform segments and which are operative at turbine operating temperatures and speeds to distribute loading on the platform segments as the fingers are seated against the underside of the blade platforms to seal the gaps without undesirably stressing thin web ceramic sections of the platform.

  16. CFD analysis of rotating two-bladed flatback wind turbine rotor.

    SciTech Connect (OSTI)

    van Dam, C.P. (University of California, David, CA); Chao, David D.; Berg, Dale E. (University of California, David, CA)

    2008-04-01

    The effects of modifying the inboard portion of the NREL Phase VI rotor using a thickened, flatback version of the S809 design airfoil are studied using a three-dimensional Reynolds-averaged Navier-Stokes method. A motivation for using such a thicker airfoil design coupled with a blunt trailing edge is to alleviate structural constraints while reducing blade weight and maintaining the power performance of the rotor. The calculated results for the baseline Phase VI rotor are benchmarked against wind tunnel results obtained at 10, 7, and 5 meters per second. The calculated results for the modified rotor are compared against those of the baseline rotor. The results of this study demonstrate that a thick, flatback blade profile is viable as a bridge to connect structural requirements with aerodynamic performance in designing future wind turbine rotors.

  17. HIGH EFFICIENCY STRUCTURAL FLOWTHROUGH ROTOR WITH ACTIVE FLAP CONTROL: VOLUME ONE: PRELIMINARY DESIGN REPORT

    SciTech Connect (OSTI)

    Zuteck, Michael D.; Jackson, Kevin L.; Santos, Richard A.; Chow, Ray; Nordenholz, Thomas R.; Wamble, John Lee

    2015-05-16

    The Zimitar one-piece rotor primary structure is integrated, so balanced thrust and gravity loads flow through the hub region without transferring out of its composite material. Large inner rotor geometry is used since there is no need to neck down to a blade root region and pitch bearing. Rotor control is provided by a highly redundant, five flap system on each blade, sized so that easily handled standard electric linear actuators are sufficient.

  18. HIGH EFFICIENCY STRUCTURAL FLOWTHROUGH ROTOR WITH ACTIVE FLAP CONTROL: VOLUME THREE: MARKET & TEAM

    SciTech Connect (OSTI)

    Zuteck, Michael D.; Jackson, Kevin L.; Santos, Richard A.

    2015-05-16

    The Zimitar one-piece rotor primary structure is integrated, so balanced thrust and gravity loads flow through the hub region without transferring out of its composite material. Large inner rotor geometry is used since there is no need to neck down to a blade root region and pitch bearing. Rotor control is provided by a highly redundant, five flap system on each blade, sized so that easily handled standard electric linear actuators are sufficient.

  19. File:Modeling-power-efficiency-and-tip-speed-ratio-lp.pdf | Open Energy

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages Recent Changes AllApschem.pdfgasp 03.pdfMmpa 2007.pdf Jump to: navigation,

  20. File:Modeling-power-efficiency-and-tip-speed-ratio-student.pdf | Open

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages Recent Changes AllApschem.pdfgasp 03.pdfMmpa 2007.pdf Jump to: navigation,Energy

  1. File:Modeling-power-efficiency-and-tip-speed-ratios-teacher.pdf | Open

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages Recent Changes AllApschem.pdfgasp 03.pdfMmpa 2007.pdf Jump to:

  2. File:Tip-top-tip-speed-lp.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages RecentTempCampApplicationWorksheet 2011.pdf Jump to: navigation,

  3. File:Tip-top-tip-speed-student.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QAsource History View New Pages RecentTempCampApplicationWorksheet 2011.pdf Jump to:

  4. File:Modeling-power-efficiency-and-tip-speed-ratio-lp-HS.pdf | Open Energy

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAES energy site.pdf | Open

  5. File:Modeling-power-efficiency-and-tip-speed-ratio-student-HS.pdf | Open

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAES energy site.pdf | OpenEnergy

  6. File:Modeling-power-efficiency-and-tip-speed-ratios-teacher-HS.pdf | Open

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAES energy site.pdf | OpenEnergyEnergy

  7. File:Table for Tip Speed Intervals of Length.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAESRAPID Toolkit Flyer.pdfSkystreamTable for

  8. File:Tip-top-tip-speed-teacher-HS.pdf | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdisto ElectricMonasterwindCAESRAPID ToolkitTip

  9. Tuning thermal mismatch between turbine rotor parts with a thermal medium

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2001-01-01

    In a turbine rotor, an aft shaft wheel and the final-stage wheel of the rotor are coupled together, including by a rabbeted joint. During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel and final-stage wheel is avoided by respectively heating and cooling the aft shaft wheel to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint and the potential for unbalancing the rotor and rotor vibration. The thermal medium may be supplied by piping in the aft bearing cavity into the cavity between the forward closure plate and the aft shaft wheel.

  10. Methods and apparatus for reduction of asymmetric rotor loads in wind turbines

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw; Pierce, Kirk Gee

    2006-10-10

    A method for reducing load and providing yaw alignment in a wind turbine includes measuring displacements or moments resulting from asymmetric loads on the wind turbine. These measured displacements or moments are used to determine a pitch for each rotor blade to reduce or counter asymmetric rotor loading and a favorable yaw orientation to reduce pitch activity. Yaw alignment of the wind turbine is adjusted in accordance with the favorable yaw orientation and the pitch of each rotor blade is adjusted in accordance with the determined pitch to reduce or counter asymmetric rotor loading.

  11. The Ultra-micro Wave Rotor Research at Michigan State University Florin Iancu, Janusz Piechna*

    E-Print Network [OSTI]

    Müller, Norbert

    , a gasdynamic model, and CFD models, the wave rotor compression efficiency at microfabrication scale could like turbines, compressors, pumps, but also electric generators, heat exchangers, internal combustion

  12. Sandia Energy - The Influence of Rotor Blade Design on Wake Developmen...

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

    Influence of Rotor Blade Design on Wake Development Home Renewable Energy Energy SWIFT Facilities News Wind Energy News & Events Systems Analysis Systems Engineering The Influence...

  13. MHK Technologies/Wave Rotor | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIXsource HistoryScenarios Towards 2050Enermar <OMISPower Desalination < MHKRiderRotor

  14. Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On-Line Disturbance Data

    E-Print Network [OSTI]

    Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On technique to estimate and model rotor- body parameters of a large steam turbine-generator from real time

  15. Molecular rotors: synthesis and evaluation as viscosity sensors Jeyanthy Sutharsan a

    E-Print Network [OSTI]

    Theodorakis, Emmanuel

    Molecular rotors: synthesis and evaluation as viscosity sensors Jeyanthy Sutharsan a , Darcy-mechanical viscosity sensors. These compounds, referred to as molecular rotors, belong to a class of fluorescent probes present the synthesis and spectroscopic characterization of these compounds as viscosity sensors

  16. Double Side Control of Wound Rotor Induction Machine for Wind Energy Application Employing Half Controlled

    E-Print Network [OSTI]

    Lipo, Thomas

    of the machine. By doing so, the winding design (copper volume) and losses in the machine as well as in the power-of-the-art technology for wind power employs a doubly-fed machine with only rotor side control where the stator2005-27 Double Side Control of Wound Rotor Induction Machine for Wind Energy Application Employing

  17. RIS0-M-2432 SIMPLIFIED LAWS OF SIMIALRITY FOR WIND TURBINE ROTORS

    E-Print Network [OSTI]

    RIS0-M-2432 SIMPLIFIED LAWS OF SIMIALRITY FOR WIND TURBINE ROTORS Helge Petersen The Test Station for Small Windmills Abstract, Laws of similarity or scaling laws for the character- istics of a wind turbine rotor are of importance to the designer even during the initial design phase of a new wind turbine con

  18. ISABE-2005-1214 Optimum Applications of Four-Port Wave Rotors for Gas Turbines Enhancement

    E-Print Network [OSTI]

    Müller, Norbert

    1 ISABE-2005-1214 Optimum Applications of Four-Port Wave Rotors for Gas Turbines Enhancement Emmett investigations on wave rotor applications for gas turbines have been published, among them conceptual, analytical in the gas turbine industry. The results and conclusions are derived from a wide- range multi

  19. Passivity-based control of a wound-rotor synchronous Arnau D`oria-Cerezoa

    E-Print Network [OSTI]

    Batlle, Carles

    rotor synchronous machine (WRSM) is used for generation and also for drive ap- plications [1 methods has been proposed in [9], and the specific cases for synchronous generators and drives canPassivity-based control of a wound-rotor synchronous motor Arnau D`oria-Cerezoa , Carles Batlleb

  20. Rotordynamic performance of a rotor supported on bump-type foil bearings: experiments and predictions 

    E-Print Network [OSTI]

    Rubio Tabares, Dario

    2006-08-16

    ? foil journal bearings. Coastdown tests from 61,000 rpm Steady state motions at subsynchronous rigid body mode frequencies limited in magnitude. Similar dynamic performance of the rotor system for vertical and horizontal operations. 2002 Swason E...????????????????????????????? 65 Predicted Bearing Performance?????????????????... 65 Journal Eccentricity and Attitude Angle??????????????. 68 Predicted Bearing Force Coefficients???????????????.. 72 Predicted Rotor/Bearing Performance???????????????. 75 Damped Natural...

  1. American Institute of Aeronautics and Astronautics Wave Rotor Research Program at Michigan State University

    E-Print Network [OSTI]

    Müller, Norbert

    and significant potential of wave rotor technology for performance improvement of gas turbine and jet engines and expansion waves to add or remove energy from a fluid flow. It has been proved that for modest pressureAmerican Institute of Aeronautics and Astronautics 1 Wave Rotor Research Program at Michigan State

  2. Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow

    E-Print Network [OSTI]

    Boyer, Edmond

    Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow S in a rotor-stator cavity subjected to a superimposed throughflow with heat transfer. Nu- merical predictions field from the heat transfer process. The turbulent flux is approximated by a gradient hypothesis

  3. Granular rotor as a probe for a non-equilibrium bath

    E-Print Network [OSTI]

    Tomohiko G. Sano; Kiyoshi Kanazawa; Hisao Hayakawa

    2015-11-27

    The dynamics of a rotor under viscous or dry friction is investigated as a non-equilibrium probe of a granular gas numerically and analytically. To demonstrate a role of the rotor as a probe for a non-equilibrium bath, we perform the molecular dynamics (MD) simulation of the rotor under viscous or dry friction surrounded by a steady granular gas under gravity. We theoretically derive a one-to-one map between the velocity distribution function (VDF) for the granular gas and the angular one for the rotor. With the aid of the MD simulation, we demonstrate that the one-to-one map works well to infer the local VDF of the granular gas from the angular one of the rotor, and vice versa.

  4. A First-Order Stochastic Prognostic System for the Diagnosis of Helicopter Rotor Systems for the US Navy

    E-Print Network [OSTI]

    Luger, George

    A First-Order Stochastic Prognostic System for the Diagnosis of Helicopter Rotor Systems for the US a diagnostic system for the US Navy to use in the analysis of the "running health" of helicopter rotor systems the data sets of actual helicopter rotor failures supplied by the US Navy. We discuss both critical

  5. Characteristics of a multiple disk pump with turbulent rotor flow 

    E-Print Network [OSTI]

    Roddy, Patrick James

    1985-01-01

    of these turbomachines until the early sixties when Rice [4] designed and tested a multiple disk pump and compressor. Since then, the per- formance of these turbomachines operating with laminar rotor flow has been well documented [1-6, 7-12]. In the seventies, Bakke... the Disk Radius (LT'8) [ (8 + |/)/T + ( aH/8)]2 2T/T ruotq. znba [gy] yyzqoznqg g~otTdxa aqua. go surzag u) passaudxa aq uzo zoq. ozg uoTgo)zg 9uxuuzg aqua '(gT'2) uoTgznba uZ (9T'2) (au 2/1 2 2 ( (n) + (& ? &U)) = sz r(s)p aqua Suoyz guxod fiuz gz...

  6. Final project report: High energy rotor development, test and evaluation

    SciTech Connect (OSTI)

    1996-09-01

    Under the auspices of the {open_quotes}Government/Industry Wind Technology Applications Project{close_quotes} [{open_quotes}Letter of Interest{close_quotes} (LOI) Number RC-1-11101], Flo Wind Corp. has successfully developed, tested, and delivered a high-energy rotor upgrade candidate for their 19-meter Vertical Axis Wind Turbine. The project included the demonstration of the innovative extended height-to-diameter ratio concept, the development of a continuous span single-piece composite blade, the demonstration of a continuous blade manufacturing technique, the utilization of the Sandia National Laboratories developed SNLA 2150 natural laminar flow airfoil and the reuse of existing wind turbine and wind power plant infrastructure.

  7. Cooling system for a bearing of a turbine rotor

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2002-01-01

    In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

  8. Adaptor assembly for coupling turbine blades to rotor disks

    SciTech Connect (OSTI)

    Delvaux, John McConnel; Garcia-Crespo, Andres Jose; Joyce, Kilmer Joseph; Tindell, Allan Randall

    2014-06-03

    An adaptor assembly for coupling a blade root of a turbine blade to a root slot of a rotor disk is disclosed. The adaptor assembly may generally include an adaptor body having a root configured to be received within the root slot. The adaptor body may also define a slot having an open end configured to receive the blade root. The adaptor body may further define a channel. The adaptor assembly may also include a plate having an outwardly extending foot. The foot may be configured to be received within the channel. Additionally, the plate may be configured to cover at least a portion of the open end of the slot when the foot is received within the channel.

  9. Rotor parameter determination for the Brushless Doubly Fed (Induction) Machine (BDFM)

    E-Print Network [OSTI]

    McMahon, R. A.; Roberts, P. C.; Tatlow, M. R.; Abdi, E.; Broekhof, A.; Abdi, S.

    2015-06-19

    mouth opening ?r rotor angular velocity R,C,N,Z fields of real and complex numbers, sets of natural numbers and integers diag(X1, X2, · · · ) Diagonal matrix with scalars or matrices X1, X2 etc. kw winding factor for a single loop in a nest Neff... p 2 ) sin (?srp 2 ) ?srp 2 (18) Where ? is the individual coil span of the loop, p is the rotor harmonic pole pair given in the set (17) and ?sr is the angular slot mouth span. The self-inductance evaluated for all rotor loops of a specific span...

  10. Method and system for controlling a rotational speed of a rotor of a turbogenerator

    DOE Patents [OSTI]

    Stahlhut, Ronnie Dean; Vuk, Carl Thomas

    2008-12-30

    A system and method controls a rotational speed of a rotor or shaft of a turbogenerator in accordance with a present voltage level on a direct current bus. A lower threshold and a higher threshold are established for a speed of a rotor or shaft of a turbogenerator. A speed sensor determines speed data or a speed signal for the rotor or shaft associated with a turbogenerator. A voltage regulator adjusts a voltage level associated with a direct current bus within a target voltage range if the speed data or speed signal indicates that the speed is above the higher threshold or below the lower threshold.

  11. Rotor spectra, berry phases, and monopole fields: From antiferromagnets to QCD

    SciTech Connect (OSTI)

    Chandrasekharan, S.; Jiang, F.-J.; Wiese, U.-J.; Pepe, M.

    2008-10-01

    The order parameter of a finite system with a spontaneously broken continuous global symmetry acts as a quantum mechanical rotor. Both antiferromagnets with a spontaneously broken SU(2){sub s} spin symmetry and massless QCD with a broken SU(2){sub L}xSU(2){sub R} chiral symmetry have rotor spectra when considered in a finite volume. When an electron or hole is doped into an antiferromagnet or when a nucleon is propagating through the QCD vacuum, a Berry phase arises from a monopole field and the angular momentum of the rotor is quantized in half-integer units.

  12. Effects of rotor tip blade loading variation on compressor stage performance

    E-Print Network [OSTI]

    Tiralap, Aniwat

    2015-01-01

    Changes in loss generation associated with altering the rotor tip loading of an embedded compressor stage is assessed. Steady and unsteady three-dimensional computations, complemented by control volume analyses, for varying ...

  13. The cost of noise reduction for departure and arrival operations of commercial tilt rotor aircraft

    E-Print Network [OSTI]

    Faulkner, Henry B.

    1976-01-01

    The relationship between direct operating cost (DOC) and noise annoyance due to a departure and an arrival operation was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt ...

  14. The effects of torsional-lateral coupling on the dynamics of a gear coupled rotor 

    E-Print Network [OSTI]

    Emery, Michael Aaron

    2007-04-25

    This thesis focuses on the torsional-lateral interactions seen in gear coupled rotors. Of particular interest are cases where the torsional stiffness parameters affect the lateral critical speeds and where lateral stiffness and damping parameters...

  15. A study of chaos in a rotor system supported by ball bearings 

    E-Print Network [OSTI]

    Ortiz, Steven Rey

    2013-02-22

    . Numerous researchers have published a myriad of papers on the application of chaos theory to mechanical, electrical and biological systems. However, control theories of chaos have been in existence for only a decade and have not been applied to rotor...

  16. Effects of rotor tip clearance on an embedded compressor stage performance

    E-Print Network [OSTI]

    Sakulkaew, Sitanun

    2012-01-01

    Compressor efficiency variation with rotor tip gap is assessed using numerical simulations on an embedded stage representative of that in a large industrial gas turbine with Reynolds number being approximately 2 x 106 to ...

  17. Effect of Cooling Flow on the Operation of a Hot Rotor-Gas Foil Bearing System 

    E-Print Network [OSTI]

    Ryu, Keun

    2012-02-14

    Gas foil bearings (GFBs) operating at high temperature rely on thermal management procedures that supply needed cooling flow streams to keep the bearing and rotor from overheating. Poor thermal management not only makes ...

  18. Identification of force coefficients in flexible rotor-bearing systems - enhancements and further validations 

    E-Print Network [OSTI]

    Balantrapu, Achuta Kishore Rama Krishna

    2005-11-01

    Rotor-bearing system characteristics, such as natural frequencies, mode shapes, stiffness and damping coefficients, are essential to diagnose and correct vibration problems during system operation. Of the above characteristics, accurate...

  19. Experimental response of a rotor supported on Rayleigh step gas bearings 

    E-Print Network [OSTI]

    Zhu, Xuehua

    2004-11-15

    Gas bearings enable successful applications in high speed oil-free microturbomachinery. This thesis presents analysis and experiments of the dynamic performance of a rotor supported on Rayleigh step gas bearings. Comprehensive experiments...

  20. Identification of rotordynamic forces in a flexible rotor system using magnetic bearings 

    E-Print Network [OSTI]

    Zutavern, Zachary Scott

    2009-06-02

    Methods are presented for parameter identification of an annular gas seal on a flexiblerotor test rig. Dynamic loads are applied by magnetic bearings (MBs) that support the rotor. MB forces are measured using fiber-optic strain gauges...

  1. Crossflow instability in rotor-stator flows with throughflow , M.-P. Chauve

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Crossflow instability in rotor-stator flows with throughflow S. Poncet , M.-P. Chauve We study. As the axial velocity profiles exhibit inflexion points, this instability is of crossflow type. From

  2. BASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA,

    E-Print Network [OSTI]

    Parker, Gary B.

    BASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA, JMMCL2@CONNCOLL.EDU GARY PARKER, CONNECTICUT COLLEGE, USA, PARKER@CONNCOLL.EDU NEWELL SEAL, CONNECTICUT

  3. On the characteristics of fault-induced rotor-dynamic bifurcations and nonlinear responses 

    E-Print Network [OSTI]

    Yang, Baozhong

    2004-11-15

    speeds, the demand for better and improved performance achievable through higher speeds has rendered the use of a linear approach for rotor-dynamic analysis both inadequate and ineffective. To establish the fundamental knowledge base necessary...

  4. An embedded controller for quad-rotor flying robots running distributed algorithms

    E-Print Network [OSTI]

    Julian, Brian John

    2009-01-01

    Multiple collaborating quad-rotor flying robots are useful in a broad range of applications, from surveillance with onboard cameras to reconfiguration of wireless networks. For these applications, it is often advantageous ...

  5. Blade-forced vibration effects in turbomachinery rotor-stator interaction 

    E-Print Network [OSTI]

    Collard, Joseph Eugene

    2000-01-01

    This thesis presents the effects of blade-forced vibration in turbomachinery rotor-stator interaction. A quasi-three-dimensional multi-row analysis, based on an Euler/Navier-Stokes solver and a parallel computational ...

  6. Spin-rotor Interpretation of Identical Bands and Quantized Alignment in Superdeformed A $\\approx$ 190 Nuclei

    E-Print Network [OSTI]

    J. A. Cizewski; R. Bijker

    1995-06-02

    The ``identical'' bands in superdeformed mercury, thallium, and lead nuclei are interpreted as examples of orbital angular momentum rotors with the weak spin-orbit coupling of pseudo-$SU(3)$ symmetries and supersymmetries.

  7. Method and apparatus for reducing rotor blade deflections, loads, and/or peak rotational speed

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw; Pierce, Kirk Gee

    2006-10-17

    A method for reducing at least one of loads, deflections of rotor blades, or peak rotational speed of a wind turbine includes storing recent historical pitch related data, wind related data, or both. The stored recent historical data is analyzed to determine at least one of whether rapid pitching is occurring or whether wind speed decreases are occurring. A minimum pitch, a pitch rate limit, or both are imposed on pitch angle controls of the rotor blades conditioned upon results of the analysis.

  8. Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program

    Broader source: Energy.gov [DOE]

    If you’ve ever driven by an industrial plant, you’ve probably noticed big white plumes rising from the tops of the facilities. While it might look like smoke or pollution at first glance, most of the time those white plumes are comprised of steam and heat, or what Ener-G-Rotors CEO Michael Newell calls waste heat. Mike and the researchers of Ener-G-Rotors are finding ways to use this escaped steam and turn it into energy.

  9. RAMGEN ROTOR CARTRIDGE FOR THE PRE-PROTOTYPE RAMGEN ENGINE

    SciTech Connect (OSTI)

    Aaron Koopman

    2003-09-01

    The research and development of a unique combustion engine is presented. The engine converts the thrust from ramjet modules located on the rim of a disk into shaft torque, which in turn can be used for electrical power generation or mechanical drive applications. A test program was undertaken that included evaluation of the pre-prototype engine and incorporation of improvements to the thrust modules and supporting systems. Fuel mixing studies with vortex generators and bluff body flame holders demonstrated the importance of increasing the shear-layer area and spreading angle to augment flame volume. Evaluation of flame-holding configurations (with variable fuel injection methods) concluded that the heat release zone, and therefore combustion efficiency, could be manipulated by judicious selection of bluff body geometry, and is less influenced by fuel injection distribution. Finally, successful operation of novel fuel and cooling air delivery systems have resolved issues of gas (fuel and air) delivery to the individual rotor segments. The lessons learned from the pre-prototype engine are currently being applied to the development of a 2.8MW engine.

  10. Control system for a wound-rotor motor

    DOE Patents [OSTI]

    Ellis, James N. (Chatsworth, CA)

    1983-01-01

    A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristic.

  11. Dynamic Rotor Deformation and Vibration Monitoring Using a Non-Incremental Laser Doppler Distance Sensor

    SciTech Connect (OSTI)

    Pfister, Thorsten; Guenther, Philipp; Dreier, Florian; Czarske, Juergen

    2010-05-28

    Monitoring rotor deformations and vibrations dynamically is an important task for improving the safety and the lifetime as well as the energy efficiency of motors and turbo machines. However, due to the high rotor speed encountered in particular at turbo machines, this requires concurrently a high measurement rate and high accuracy, which can not be fulfilled by most commercially available sensors. To solve this problem, we developed a non-incremental laser Doppler distance sensor (LDDS), which is able to measure simultaneously the in-plane velocity and the out-of-plane position of moving rough solid objects with micrometer precision. In addition, this sensor concurrently offers a high temporal resolution in the microsecond range, because its position uncertainty is in principle independent of the object velocity in contrast to conventional distance sensors, which is a unique feature of the LDDS. Consequently, this novel sensor enables precise and dynamic in-process deformation and vibration measurements on rotating objects, such as turbo machine rotors, even at very high speed. In order to evidence the capability of the LDDS, measurements of rotor deformations (radial expansion), vibrations and wobbling motions are presented at up to 50,000 rpm rotor speed.

  12. Non-equilibrium steady state and subgeometric ergodicity for a chain of three coupled rotors

    E-Print Network [OSTI]

    Noé Cuneo; Jean-Pierre Eckmann; Christophe Poquet

    2015-09-03

    We consider a chain of three rotors (rotators) whose ends are coupled to stochastic heat baths. The temperatures of the two baths can be different, and we allow some constant torque to be applied at each end of the chain. Under some non-degeneracy condition on the interaction potentials, we show that the process admits a unique invariant probability measure, and that it is ergodic with a stretched exponential rate. The interesting issue is to estimate the rate at which the energy of the middle rotor decreases. As it is not directly connected to the heat baths, its energy can only be dissipated through the two outer rotors. But when the middle rotor spins very rapidly, it fails to interact effectively with its neighbors due to the rapid oscillations of the forces. By averaging techniques, we obtain an effective dynamics for the middle rotor, which then enables us to find a Lyapunov function. This and an irreducibility argument give the desired result. We finally illustrate numerically some properties of the non-equilibrium steady state.

  13. Ingestion of high temperature mainstream gas into the rotor-stator cavities of a gas turbine is one of the major problems faced by the turbine designers. The ingested gas heats up rotor disks and induces higher

    E-Print Network [OSTI]

    Ingestion of high temperature mainstream gas into the rotor-stator cavities of a gas turbine is one of the major problems faced by the turbine designers. The ingested gas heats up rotor disks and induces higher a negative effect on the gas turbine thermal efficiency, one goal is to use the least possible amount

  14. Axial seal system for a gas turbine steam-cooled rotor

    DOE Patents [OSTI]

    Mashey, Thomas Charles (Anderson, SC)

    2002-01-01

    An axial seal assembly is provided at the interface between adjacent wheels and spacers of a gas turbine rotor and disposed about tubes passing through openings in the rotor adjacent the rotor rim and carrying a thermal medium. Each seal assembly includes a support bushing for supporting a land of the thermal medium carrying tube, an axially registering seat bushing disposed in the opposed opening and a frustoconical seal between the seal bushing and seat. The seal bushing includes a radial flange having an annular recess for retaining the outer diameter edge of the seal, while the seat bushing has an axially facing annular surface forming a seat for engagement by the inner diameter edge of the seal.

  15. A methodology for exploiting the tolerance for imprecision in genetic fuzzy systems and its application to characterization of rotor

    E-Print Network [OSTI]

    Granada, Universidad de

    . This methodology has been applied to predict whether the coating of an helicopter rotor blade is adequate application to characterization of rotor blade leading edge materials Luciano Sa´nchez a , Ine´s Couso b process, that aids to make agile decisions in the absence of a causal model or extensive prototype testing

  16. On the Comparison of Multiple Signature LDA and Neural Network Based Broken Rotor Bar Detection Schemes in Induction Motors

    E-Print Network [OSTI]

    Chow, Mo-Yuen

    Schemes in Induction Motors Bulent Ayhan, Mo-Yuen Chow, Myung-Hyun Song bayhan@unity.ncsu.edu, chow@eos.ncsu.edu, mhsong@sunchon.ac.kr Abstract ­ Broken rotor bars in induction motors can be detected by monitoring any abnormality of the spectrum amplitudes at certain frequencies in the motor current spectrum. Broken rotor bar

  17. A numerical investigation of transonic axial compressor rotor flow using a low-Reynolds-number {kappa}-{epsilon} turbulence model

    SciTech Connect (OSTI)

    Arima, T.; Sonoda, T.; Shirotori, M.; Tamura, A.; Kikuchi, K.

    1999-01-01

    The authors have developed a computer simulation code for three-dimensional viscous flow in turbomachinery based on the time-averaged compressible Navier-Stokes equations and a low-Reynolds-number {kappa}-{epsilon} turbulence model. It is described in detail in this paper. The code is used to compute the flow fields for two types of rotor (a transonic fan NASA Rotor 67 and a transonic axial compressor NASA rotor 37), and numerical results are compared to experimental data based on aerodynamic probe and laser anemometer measurements. In the case of Rotor 67, calculated and experimental results are compared under the design speed to validate the code. The calculated results show good agreement with the experimental data, such as the rotor performance map and the spanwise distribution of total pressure, total temperature, and flow angle downstream of the rotor. In the case of Rotor 37, detailed comparisons between the numerical results and the experimental data are made under the design speed condition to assess the overall quality of the numerical solution. Furthermore, comparisons under the part-speed condition are used to investigate a flow field without passage shock. The results are well predicted qualitatively. However, considerable quantitative discrepancies remain in predicting the flow near the tip. In order to assess the predictive capabilities of the developed code, computed flow structures are presented with the experimental data for each rotor and the cause of the discrepancies is discussed.

  18. Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report

    SciTech Connect (OSTI)

    Corren, Dean; Colby, Jonathan; Adonizio, Mary Ann

    2013-01-29

    Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

  19. Dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine

    DOE Patents [OSTI]

    Qu, Ronghai; Lipo, Thomas A.

    2005-08-02

    The present invention provides a novel dual-rotor, radial-flux, toroidally-wound, permanent-magnet machine. The present invention improves electrical machine torque density and efficiency. At least one concentric surface-mounted permanent magnet dual-rotor is located inside and outside of a torus-shaped stator with back-to-back windings, respectively. The machine substantially improves machine efficiency by reducing the end windings and boosts the torque density by at least doubling the air gap and optimizing the machine aspect ratio.

  20. RESULTS AND DISCUSSION -Part I UH60A Rotor in High Speed Forward Flight

    E-Print Network [OSTI]

    , typical of that found on a current generation army helicopter. It has a complex blade form that tends in this chapter is that of a UH-60A rotor in high speed forward flight condition. This case was chosen to test helicopter low speed descent flight. This particular flight condition is dominated by BVI phenomena

  1. RESULTS AND DISCUSSION Part II AH-1G ROTOR IN LOW SPEED DESCENT FLIGHT

    E-Print Network [OSTI]

    ;5.1 Details of the Flight Test A flight test of the AH-1G helicopter was performed at NASA Ames Research and Acoustics Test (TAAT) was conducted on an AH-1G Cobra. It used highly instrumented rotor blades collected from a few pressure ports on the blade. Several calculations for this helicopter have been

  2. MPC for Wind Power Gradients --Utilizing Forecasts, Rotor Inertia, and Central Energy Storage

    E-Print Network [OSTI]

    MPC for Wind Power Gradients -- Utilizing Forecasts, Rotor Inertia, and Central Energy Storage the control of a wind power plant, possibly consisting of many individual wind turbines. The goal. INTRODUCTION Today, wind power is the most important renewable energy source. For the years to come, many

  3. 3-D Time-Accurate CFD Simulations of Wind Turbine Rotor Flow Fields

    E-Print Network [OSTI]

    -dimensional flow properties of rotating blades are an essential feature of any wind turbine aerodynamic-rotating simulations, some aspects of the physics of wind turbine aerodynamics and noise must be obtained from rotating3-D Time-Accurate CFD Simulations of Wind Turbine Rotor Flow Fields Nilay Sezer-Uzol and Lyle N

  4. Wind Farm Simulations Using a Full Rotor Model for Wind Turbines

    E-Print Network [OSTI]

    Mavripli, Dimitri J.

    Wind Farm Simulations Using a Full Rotor Model for Wind Turbines Jay Sitaraman Dimitri Mavriplis model for the wind turbines. The analysis scheme combines several technologies, viz. unstructured mesh Wind turbine aeromechanics represents a complex problem that spans several disparate spatial

  5. American Institute of Aeronautics and Astronautics Numerical Solutions for Ultra-Micro Wave Rotors (UWR)

    E-Print Network [OSTI]

    Müller, Norbert

    turbines, compressors, pumps, but also electric generators, heat exchangers, internal combustion engines of these wave rotors are presented, results obtained using FLUENT, a Computational Fluid Dynamics (CFD of combustion L = channel length m& = mass flow rate = kinematic viscosity = pressure ratio p = pressure WR

  6. Rotor and Subrotor Dynamics in the Lee of Three-Dimensional Terrain JAMES D. DOYLE

    E-Print Network [OSTI]

    Frierson, Dargan

    circulation, where they dissipate and contribute their vorticity toward the maintenance of the main rotor of their intensity, such subrotor circulations likely pose the greatest hazard to aviation. 1. Introduction and shear, and have been sug- gested to contribute to numerous aviation incidents and accidents (e.g., NTSB

  7. American Institute of Aeronautics and Astronautics An Application of Wave Rotor Technology for Performance

    E-Print Network [OSTI]

    Müller, Norbert

    as a refrigerant in air conditioning in aircrafts and train compartments. The use of air as a refrigerant is based employed. The air refrigeration cycles appear to use more energy than comparable vapor compression cyc rotor implementation can increase efficiency and reduce size and cost of R718 units. The condensing wave

  8. Sudden stoppage of rotor in a thermally driven rotary motor made from double-

    E-Print Network [OSTI]

    Qin, Qinghua

    Sudden stoppage of rotor in a thermally driven rotary motor made from double- walled carbon nanotubes K Cai1 , J Z Yu1 , H Yin1 and Q H Qin2 1 College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, People's Republic of China 2 Research School of Engineering

  9. Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow

    E-Print Network [OSTI]

    Boyer, Edmond

    Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow S the dynamical effects from the heat transfer process. The fluid flow in an enclosed disk system with axial with heat transfer along the stator, which corresponds to the experiment of Djaoui et al. [2]. Our results

  10. Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators

    E-Print Network [OSTI]

    Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators I. Zana* , F, USA Abstract We present and characterize a process to pattern magnetic poles on small permanent-magnet, this approach uses a ferromagnetic magnetizing head (MH) and an externally applied magnetic field, and it offers

  11. Impact of Rotor Surface Velocity, Leakage Models and Real Gas Properties on Rotordynamic Force Predictions of Gas Labyrinth Seals 

    E-Print Network [OSTI]

    Thorat, Manish R.

    2010-07-14

    Rotordynamic coefficients of a gas labyrinth seal are assumed to be frequency independent. However, this assumption loses its validity as rotor surface velocity approaches Mach 1. The solution procedure of 1CV model by ...

  12. Risk assessment of turbine rotor failure using probabilistic ultrasonic non-destructive evaluations

    SciTech Connect (OSTI)

    Guan, Xuefei; Zhang, Jingdan; Zhou, S. Kevin; Rasselkorde, El Mahjoub; Abbasi, Waheed A.

    2014-02-18

    The study presents a method and application of risk assessment methodology for turbine rotor fatigue failure using probabilistic ultrasonic nondestructive evaluations. A rigorous probabilistic modeling for ultrasonic flaw sizing is developed by incorporating the model-assisted probability of detection, and the probability density function (PDF) of the actual flaw size is derived. Two general scenarios, namely the ultrasonic inspection with an identified flaw indication and the ultrasonic inspection without flaw indication, are considered in the derivation. To perform estimations for fatigue reliability and remaining useful life, uncertainties from ultrasonic flaw sizing and fatigue model parameters are systematically included and quantified. The model parameter PDF is estimated using Bayesian parameter estimation and actual fatigue testing data. The overall method is demonstrated using a realistic application of steam turbine rotor, and the risk analysis under given safety criteria is provided to support maintenance planning.

  13. Microwave-emitting rotor, separator apparatus including same, methods of operation and design thereof

    DOE Patents [OSTI]

    Meikrantz, David H.

    2006-12-19

    An apparatus for use in separating, at least in part, a mixture, including at least one chamber and at least one microwave generation device configured for communicating microwave energy into the at least one chamber is disclosed. The rotor assembly may comprise an electric generator for generating electricity for operating the microwave generation device. At least one microwave generation device may be positioned within a tubular interior shaft extending within the rotor assembly. At least a portion of the tubular interior shaft may be substantially transparent to microwave energy. Microwave energy may be emitted in an outward radial direction or toward an anticipated boundary surface defined between a mixture and a separated constituent thereof. A method including flowing a mixture through at least one chamber and communicating microwave energy into the at least one chamber while rotating same is disclosed. Methods of operating a centrifugal separator and design thereof are disclosed.

  14. Operator reflection positivity inequalities and their applications to interacting quantum rotors

    E-Print Network [OSTI]

    Jacek Wojtkiewicz; Wies?aw Pusz; Piotr Stachura

    2015-07-11

    In the Reflection Positivity theory and its application to statistical mechanical systems, certain matrix inequalities play a central role. The Dyson-Lieb-Simon and Kennedy-Lieb-Shastry-Schupp inequalities constitute prominent examples. In this paper we extend the KLS-S inequality to the case where matrices are replaced by certain operators. As an application, we prove the occurrence of the long range order in the ground state of two-dimensional quantum rotors.

  15. Rotor whirl forces induced by the tip clearance effect in axial flow compressors

    SciTech Connect (OSTI)

    Ehrich, F. )

    1993-10-01

    It is now widely recognized that destabilizing forces, tending to generate forward rotor whirl, are generated in axial flow turbines as a result of the nonuniform torque induced by the nonuniform tip-clearance in a deflected rotor--the so called Thomas/Alford force. It is also recognized that there will be a similar effect in axial flow compressors, but qualitative considerations cannot definitively establish the magnitude or even the direction of the induced whirling forces--that is, if they will tend to forward or backward whirl. Applying a parallel compressor model to simulate the operation of a compressor rotor deflected radially in its clearance, it is possible to derive a quantitative estimate of the proportionality factor [beta] which relates the Thomas/Alford force in axial flow compressors (i.e., the tangential force generated by a radial deflection of the rotor) to the torque level in the compressor. The analysis makes use of experimental data from the GE Aircraft Engines Low Speed Research Compressor facility comparing the performance of three different axial flow compressors, each with four stages (typical of a mid-block of an aircraft gas turbine compressor) at two different clearances. It is found that the value of [beta] is in the range of +0.27 to [minus]0.71 in the vicinity of the stages' nominal operating line and +0.08 to [minus]1.25 in the vicinity of the stages' operation at peak efficiency. The value of [beta] reaches a level of between [minus]1.16 and [minus]3.36 as the compressor is operated near its stalled condition.

  16. Coherent dynamics in the rotor tip shear layer of utility scale wind turbines

    E-Print Network [OSTI]

    Yang, Xiaolei; Barone, Matthew; Sotiropoulos, Fotis

    2015-01-01

    Recent field experiments conducted in the near-wake (up to 0.5 rotor diameters downwind of the rotor) of a 2.5 MW wind turbine using snow-based super-large-scale particle image velocimetery (SLPIV) (Hong et al., Nature Comm., vol. 5, 2014, no. 4216) were successful in visualizing tip vortex cores as areas devoid of snowflakes. The so-visualized snow voids, however, suggested tip vortex cores of complex shape consisting of circular cores with distinct elongated comet-like tails. We employ large-eddy simulation (LES) to elucidate the structure and dynamics of the complex tip vortices identified experimentally. The LES is shown to reproduce vortex cores in good qualitative agreement with the SLPIV results, essentially capturing all vortex core patterns observed in the field in the tip shear layer. We show that the visualized vortex patterns are the result of energetic coherent dynamics in the rotor tip shear layer driven by interactions between the tip vortices and a second set of counter-rotating spiral vortice...

  17. Can quantum fractal fluctuations be observed in an atom-optics kicked rotor experiment?

    E-Print Network [OSTI]

    Andrea Tomadin; Riccardo Mannella; Sandro Wimberger

    2005-12-01

    We investigate the parametric fluctuations in the quantum survival probability of an open version of the delta-kicked rotor model in the deep quantum regime. Spectral arguments [Guarneri I and Terraneo M 2001 Phys. Rev. E vol. 65 015203(R)] predict the existence of parametric fractal fluctuations owing to the strong dynamical localisation of the eigenstates of the kicked rotor. We discuss the possibility of observing such dynamically-induced fractality in the quantum survival probability as a function of the kicking period for the atom-optics realisation of the kicked rotor. The influence of the atoms' initial momentum distribution is studied as well as the dependence of the expected fractal dimension on finite-size effects of the experiment, such as finite detection windows and short measurement times. Our results show that clear signatures of fractality could be observed in experiments with cold atoms subjected to periodically flashed optical lattices, which offer an excellent control on interaction times and the initial atomic ensemble.

  18. Bushing retention system for thermal medium cooling delivery tubes in a gas turbine rotor

    DOE Patents [OSTI]

    Mashey, Thomas Charles (Coxsackie, NY)

    2002-01-01

    Bushings are provided in counterbores for wheels and spacers for supporting thermal medium cooling tubes extending axially adjacent the rim of the gas turbine rotor. The retention system includes a retaining ring disposed in a groove adjacent an end face of the bushing and which retaining ring projects radially inwardly to prevent axial movement of the bushing in one direction. The retention ring has a plurality of circumferentially spaced tabs along its inner diameter whereby the ring is supported by the lands of the tube maintaining its bushing retention function, notwithstanding operation in high centrifugal fields and rotation of the ring in the groove into other circular orientations.

  19. Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)

    SciTech Connect (OSTI)

    Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

    2012-01-01

    Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

  20. Effects of anisotropy on the performance characteristics of an axially laminated anisotropic-rotor synchronous reluctance motor drive system

    SciTech Connect (OSTI)

    Isaac, F.N.; Arkadan, A.A.; Russell, A.A. [Marquette Univ., Milwaukee, WI (United States)] [Marquette Univ., Milwaukee, WI (United States); El-Antably, A.

    1998-09-01

    In the last few years, increased attention has been paid to the performance characterization and evaluation of the performance of synchronous reluctance machines. Extensive research has concentrated on different rotor structures in order to achieve high performance variable speed drives for applications such as electric vehicles. The effects of accounting for anisotropy on the performance characteristics of Axially Laminated Anisotropic (ALA) rotor Synchronous Reluctance Motor (SynRM) drive systems are studied. These effects are evaluated from the simulations of a computer aided model. The model is based on the use of an iterative approach which indirectly couples a two dimensional (2D) nonlinear finite element (FE) model, which accounts for anisotropy, to a state space model describing the SynRM drive system. The simulation results are also validated by comparison to test data of a prototype ALA rotor SynRM drive system.

  1. Rotor dynamic analysis of GCEP (Gas Centrifuge Enrichment Plant) Tails Withdrawal Test Facility AC-12 compressor

    SciTech Connect (OSTI)

    Spencer, J.W.

    1982-01-22

    The reliable operation of the centrifugal compressors utilized in the gaseous diffusion process is of great importance due to the critical function of these machines in product and tails withdrawal, cascade purge and evacuation processes, the purge cascade and product booster applications. The same compressors will be used in equally important applications within the Gas Centrifuge Enrichment Plant (GCEP). In response to concern over the excessive vibration exhibited by the AC-12 compressor in the No. 3 position of the GCEP Tails Withdrawal Test Facility, a rotor-bearing dynamic analysis was performed on the compressor. This analysis included the acquisition and reduction of compressor vibration data, characterization and modeling of the rotorbearing system, a computer dynamic study, and recommendations for machine modification. The compressor dynamic analysis was performed for rotor speeds of 9000 rpm and 7200 to 7800 rpm, which includes all possible opreating speeds of the compressor in the GCEP Test Facility. While the analysis was performed on this particular AC-12 compressor, the results should be pertinent to other AC-12 applications as well. Similar diagnostic and analytical techniques can be used to evaluate operation of other types of centrifugal compressors.

  2. Modern day gas turbine designers face the problem of hot mainstream gas ingestion into rotor-stator disk cavities. To counter this ingestion, seals are installed on the rotor and stator disk rims and

    E-Print Network [OSTI]

    Modern day gas turbine designers face the problem of hot mainstream gas ingestion into rotor the supply of purge air as this decreases the net power output as well as efficiency of the gas turbine Velocimetry (PIV). Experiments were carried out in a model single-stage axial flow turbine set

  3. Sub-Fourier Characteristics of a -kicked-rotor Resonance I. Talukdar, R. Shrestha, and G. S. Summy

    E-Print Network [OSTI]

    Summy, Gil

    Sub-Fourier Characteristics of a -kicked-rotor Resonance I. Talukdar, R. Shrestha, and G. S. Summy; revised manuscript received 25 May 2010; published 28 July 2010) We experimentally investigate the sub-Fourier depends on 1=N3 , a property which we also verify experimentally. Such a sub-Fourier effect could

  4. The Proton-Driven Rotor of ATP Synthase: Ohmic Conductance (10 fS), and Absence of Voltage Gating

    E-Print Network [OSTI]

    Junge, Wolfgang

    The Proton-Driven Rotor of ATP Synthase: Ohmic Conductance (10 fS), and Absence of Voltage Gating portion of F0F1-ATP synthase, F0, translocates protons by a rotary mechanism. Proton conduction by F0. The current-voltage relationship of F0 was linear from 7 to 70 mV. The current was extremely proton

  5. Wind turbine rotor blade with in-plane sweep and devices using same, and methods for making same

    DOE Patents [OSTI]

    Wetzel, Kyle Kristopher (Lawrence, KS)

    2008-03-18

    A wind turbine includes a rotor having a hub and at least one blade having a torsionally rigid root, an inboard section, and an outboard section. The inboard section has a forward sweep relative to an elastic axis of the blade and the outboard section has an aft sweep.

  6. Wind turbine rotor blade with in-plane sweep and devices using the same, and methods for making the same

    DOE Patents [OSTI]

    Wetzel, Kyle Kristopher

    2014-06-24

    A wind turbine includes a rotor having a hub and at least one blade having a torsionally rigid root, an inboard section, and an outboard section. The inboard section has a forward sweep relative to an elastic axis of the blade and the outboard section has an aft sweep.

  7. F-ATPase: Forced Full Rotation of the Rotor Despite Covalent Cross-link with the Stator*

    E-Print Network [OSTI]

    Junge, Wolfgang

    ( A285C 7 P280C). Apparently the high torque of this rotary engine un- coiled the -helix and forced at the rotary compliance of subunit we introduced disulfide bridges between (rotor) and or (stator). We engineered cysteine residues into positions located roughly at the "top," "center," and "bottom" parts

  8. The Torque of Rotary F-ATPase Can Unfold Subunit Gamma If Rotor and Stator Are Cross-Linked

    E-Print Network [OSTI]

    Junge, Wolfgang

    cross-linked (via an engineered disulfide bridge) with the bearing, the rotary function of F1 persists an artificial disulfide bridge did not impair the rotary ATPase activity. We newly engineered three mutantsThe Torque of Rotary F-ATPase Can Unfold Subunit Gamma If Rotor and Stator Are Cross-Linked Florian

  9. {alpha} decay and shape coexistence in the {alpha}-rotor model

    SciTech Connect (OSTI)

    Richards, J.D.; Bingham, C.R.; Nazarewicz, W.; Wauters, J.; Berggren, T.; Berggren, T.; Bingham, C.R.; Nazarewicz, W.; Nazarewicz, W.

    1997-09-01

    The particle-plus-rotor model was employed to study the fine structure seen in the {alpha} decay of even-even neutron-deficient nuclei in the Hg-Po region. The configuration mixing resulting from the shape coexistence between well-deformed prolate bands and spherical (or quasirotational oblate) structures in the daughter nuclei was considered. Experimental {alpha}-decay branching ratios are reproduced within one order of magnitude, except for the case of {sup 180}Hg, where the daughter nucleus {sup 176}Pt is expected to be triaxial in its ground state. The effect of configuration mixing on the relative intensities is discussed in detail, together with the sensitivity of results to the choice of the {alpha}-nucleus optical model parameters. {copyright} {ital 1997} {ital The American Physical Society}

  10. Rotor Speed Dependent Yaw Control of Wind Turbines Based on Empirical Data

    SciTech Connect (OSTI)

    Kragh, K. A.; Fleming, P. A.

    2012-01-01

    When extracting energy from the wind using horizontal-axis upwind wind turbines, a primary condition for maximum power yield is the ability to align the rotor axis with the dominating wind direction. Attempts have been made to improve yaw alignment by applying advanced measurement techniques such as LIDARs. This study is focused at assessing the current performance of an operating turbine and exploring how the yaw alignment can be improved using existing measurements. By analyzing available turbine and met mast data a correction scheme for the original yaw alignment system is synthesized. The correction scheme is applied and it is seen that with the correction scheme in place, the power yield below rated is raised 1-5 percent. Furthermore, results indicate that blade load variations are decreased when the correction scheme is applied. The results are associated with uncertainties due to the amount of available data and the wind site climate. Further work should be focused at gathering more experimental data.

  11. Turbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex 

    E-Print Network [OSTI]

    Blake, Sarah Anne

    2009-05-15

    The turbine blade platform can be protected from hot mainstream gases by injecting cooler air through the gap between stator and rotor. The effectiveness of this film cooling method depends on the geometry of the slot, the ...

  12. Characterization of winds through the rotor plane using a phased array SODAR and recommendations for future work.

    SciTech Connect (OSTI)

    Deola, Regina Anne

    2010-02-01

    Portable remote sensing devices are increasingly needed to cost effectively characterize the meteorology at a potential wind energy site as the size of modern wind turbines increase. A short term project co-locating a Sound Detection and Ranging System (SODAR) with a 200 meter instrumented meteorological tower at the Texas Tech Wind Technology Field Site was performed to collect and summarize wind information through an atmospheric layer typical of utility scale rotor plane depths. Data collected identified large speed shears and directional shears that may lead to unbalanced loads on the rotors. This report identifies suggestions for incorporation of additional data in wind resource assessments and a few thoughts on the potential for using a SODAR or SODAR data to quantify or investigate other parameters that may be significant to the wind industry.

  13. A model for prediction of the damage and effects of explosive projectiles on helicopter composite material rotor blades 

    E-Print Network [OSTI]

    Mikel, Tilden Newton

    1982-01-01

    Projectiles on Helicopter Composite Material Rotor Blades. (December 1982) Tilden Newton Nikel, B. S. , Texas AAM University; N . S . , Texas A&N University Chairman of Advisory Committee: Dr. Clarence L. Hough Jr. A number of damage models have been.... The funding for the ballistic tests conducted during this research was provided 'by Bell Helicopter Textron, Inc. , Fort cnorth, Texs s, TABLE OF CONTENTS Page ABSTRACT. . . . . ~ ~ ~ ~ ~ ~ ~ ~ ACKNOWLEDGMENT TABLE OF CONTENTS LIST OF TABLES. LIST...

  14. Evaluation of Manufacturability of Embedded Sensors and Controls with Canned Rotor Pump System

    SciTech Connect (OSTI)

    Kisner, Roger A; Fugate, David L; Melin, Alexander M; Holcomb, David Eugene; Wilson, Dane F; Silva, Pamela C; Cruz Molina, Carola

    2013-07-01

    This report documents the current status of fabrication and assembly planning for the magnetic bearing, canned rotor pump being used as a demonstration platform for deeply integrating I&C into nuclear power plant components. The report identifies material choices and fabrication sequences for all of the required parts and the issues that need to be either resolved or accommodated during the manufacturing process. Down selection between material options has not yet been performed. Potential suppliers for all of the necessary materials have also been identified. The assembly evaluation begins by logically subdividing the pump into modules, which are themselves decomposed into individual parts. Potential materials and fabrication processes for each part in turn are then evaluated. The evaluation process includes assessment of the environmental compatibility requirements and the tolerances available for the selected fabrication processes. A description of the pump power/control electronics is also provided. The report also includes exploded views of the modules that show the integration of the various parts into modules that are then assembled to form the pump. Emphasis has been placed on thermal environment compatibility and the part dimensional changes during heat-up. No insurmountable fabrication or assembly challenges have been identified.

  15. Prediction of stochastic blade loads for three-bladed, rigid-hub rotors

    SciTech Connect (OSTI)

    Wright, A.D.; Weber, T.L.; Thresher, R.W.; Butterfield, C.P.

    1989-11-01

    Accurately predicting wind turbine blade loads and response is important for the design of future wind turbines. The need to include turbulent wind inputs in structural dynamics models is widely recognized. In this paper, the Force and Loads Analysis Program (FLAP) code will be used to predict turbulence-induced bending moments for the SERI Combined Experiment rotor blade and the Howden 330-kW blade. FLAP code predictions will be compared to the power spectra of measured blade-bending moments. Two methods will be used to generate turbulent wind inputs to FLAP: a theoretical simulation: the Pacific Northwest Laboratories (PNL) simulation theory; and measured wind-speed data taken from an array of anemometers upwind of the turbine. Turbulent wind-speed time series are input to FLAP for both methods outlined above. Power spectra of predicted flap-bending moments are compared to measured results for different wind conditions. Conclusions are also drawn as to the ability of the turbulence simulation models to provide accurate wind input to FLAP and to FLAP's ability to accurately simulate blade response to turbulence. Finally, suggestions are made as to needed improvements in the theoretical model. 11 refs., 8 figs.

  16. Apparatus and methods for aligning holes through wheels and spacers and stacking the wheels and spacers to form a turbine rotor

    DOE Patents [OSTI]

    Berry, Robert Randolph (Greenville, SC); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY)

    2000-01-01

    A gas turbine rotor stacking fixture includes upstanding bolts for reception in aligned bolt holes in superposed aft disk, wheels and spacers and upstanding alignment rods received in openings of the disk, wheels and spacers during the rotor stacking assembly. The axially registering openings enable insertion of thin-walled tubes circumferentially about the rim of the rotor, with tight tolerances to the openings to provide supply and return steam for cooling buckets. The alignment rods have radial dimensions substantially less than their dimensions in a circumferential direction to allow for radial opening misalignment due to thermal expansion, tolerance stack-up and wheel-to-spacer mismatch due to rabbet mechanical growth. The circumferential dimension of the alignment rods affords tightly toleranced alignment of the openings through which the cooling tubes are installed.

  17. Intramolecular vibrational energy redistribution from a high frequency mode in the presence of an internal rotor: Classical thick-layer diffusion and quantum localization

    E-Print Network [OSTI]

    Paranjothy Manikandan; Srihari Keshavamurthy

    2007-07-31

    We study the effect of an internal rotor on the classical and quantum intramolecular vibrational energy redistribution (IVR) dynamics of a model system with three degrees of freedom. The system is based on a Hamiltonian proposed by Martens and Reinhardt (J. Chem. Phys. {\\bf 93}, 5621 (1990).) to study IVR in the excited electronic state of para-fluorotoluene. We explicitly construct the state space and show, confirming the mechanism proposed by Martens and Reinhardt, that an excited high frequency mode relaxes via diffusion along a thick layer of chaos created by the low frequency-rotor interactions. However, the corresponding quantum dynamics exhibits no appreciable relaxation of the high frequency mode. We attribute the quantum suppression of the classical thick-layer diffusion to the rotor selection rules and, possibly, dynamical localization effects.

  18. Enclosure Requirements to Protect Personnel from Spinning Rotor Frailures at the Power Electronics and Electric Machinery Research Center

    SciTech Connect (OSTI)

    McKeever, John W

    2007-08-01

    Performance evaluation of electric motors is a major function of the Power Electronics and Electric Machinery Research Center (PEEMRC). Normally these motors have a fixed wire-wound stator and a rotating rotor, which may have conductors embedded in a ferromagnetic core (induction motors), magnets mounted on the surface of the ferromagnetic core with a thin metal or composite cylinder or ring to hold them in place, or magnets embedded in the ferromagnetic core. Most of the work currently involves the last two permanent magnet (PM) configurations. Although the stator of a radial-gap motor can absorb energy from many of the fragments ejected from the rotor during operation, the stator of an axial-gap motor is not positioned to provide significant protection. The housing of each motor can also absorb some of the energy. The most conservative approach, however, is to assume that all fragments from the rotor must be contained by a protective enclosure. An ideal enclosure is transparent. Manufacturers of such plastics as Lexan, Tuffak, and Cyrolon sell different variations of transparent enclosure material. Lexan is a polycarbonate sheet. Lexgard{reg_sign} is a penetration resistant material made by layering polycarbonate material between pieces of ordinary glass. A fragment striking a sheet of enclosure material will pierce the surface layer, but the layered polycarbonate-glass material is able to absorb the fragment's energy before it completes penetration. Tuffak{reg_sign} is Lexan polycarbonate. Cyrolon{reg_sign} bullet resistant material is acrylic sheet. The ability of the enclosure to stop a fragment depends on its thickness as well as the penetration capability of the fragment; for example, a lead fragment has much less penetrating capability than a steel fragment. Enclosure thicknesses are commercially available to provide several levels of protection. These levels depend on the momentum of the fragments and have been evaluated for some common types of ammunition. This summary quantifies four typical worst-case fragments which have maximum translational kinetic energy when ejected from a rotating annulus. (1) The first fragment is released from a rotating annular titanium ring. (2) The second fragment is a magnet released from the Oak Ridge National Laboratory's (ORNL's) 30-kW axial-gap PM motor. Analysis of the second fragment which is like a segment of half-angle, {alpha}, from a thin annular ring is similar to that of the titanium ring segment except that the angle is 10{sup o} instead of 133{sup o}. (3) The third fragment is a magnet from the radial-gap 6-kW fractional-slot surface-mounted PM (SPM) motor with concentrated windings. Analysis of the third fragment is similar to the analysis of the second fragment. (4) The fourth fragment is a 133{sup o} segment of an entire rotor which assumes that the laminates and magnets in the rotor fail as a single fragment, truly a worst case assumption.

  19. The Flying Pi Eye is an autonomous, flying drone with four rotors that lift a Raspberry Pi, GPS, and camera. The drone is

    E-Print Network [OSTI]

    Gray, Jeffrey G.

    The Flying Pi Eye is an autonomous, flying drone with four rotors that lift a Raspberry Pi, GPS a user connects the on board Raspberry Pi through ethernet to a network, sets the search area and color to battery limitations. · The Raspberry Pi is small, inexpensive, and doesn't use much power, but it also

  20. Indirect sensing for rotor flux position of permanent magnet AC motors operating over a wide speed range

    SciTech Connect (OSTI)

    Moreira, J.C.

    1996-11-01

    This paper describes an indirect sensing, or sensorless, method for rotor flux position for brushless permanent magnet (BPM) motors operating over a wide speed range, while keeping maximum torque per ampere and/or maximum efficiency capabilities. The method described is particularly applicable to trapezoidal back emf type of BPM motors. The typical trapezoidal waveform of the motor internal voltages (or back emf) contains a fundamental and higher order frequency harmonics. In particular, the third harmonic component is extracted from the stator phase voltages while the fundamental and other polyphase components are eliminated via a simple summation of the three phase voltages. The resulting third harmonic signal keeps a constant phase relationship with the rotor flux for any motor speed and load condition, and is practically free of noise that can be introduced by the inverter switching, making this a robust sensing method. In contrast with indirect sensing methods based on detection of the back-emf signal that require heavy filtering, the third harmonic signal needs only a small amount of filtering to eliminate the switching frequency and its side bands. As a result, the method described here is not sensitive to filtering delays, allowing the motor to achieve a good performance over a wide speed range. Motor starting is also superior with this method since the third harmonic signal can be detected and processed at lower speeds than for the conventional method of back-emf sensing. Moreover, an alternative way to acquire the third harmonic signal without the need to access the stator neutral terminal is discussed. This is particularly interesting with the motor neutral connection is not available or expensive to have access. The third harmonic indirect sensing scheme is implemented in the laboratory and compared to a conventional back-emf sensing method.

  1. Regressed relations for forced convection heat transfer in a direct injection stratified charge rotary engine

    SciTech Connect (OSTI)

    Lee, C.M.; Schock, H.J.

    1988-01-01

    Currently, the heat transfer equation used in the rotary combustion engine (RCE) simulation model is taken from piston engine studies. These relations have been empirically developed by the experimental input coming from piston engines whose geometry differs considerably from that of the RCE. The objective of this work was to derive equations to estimate heat transfer coefficients in the combustion chamber of an RCE. This was accomplished by making detailed temperature and pressure measurements in a direct injection stratified charge (DISC) RCE under a range of conditions. For each specific measurement point, the local gas velocity was assumed equal to the local rotor tip speed. Local physical properties of the fluids were then calculated. Two types of correlation equations were derived and are described in this paper. The first correlation expresses the Nusselt number as a function of the Prandtl number, Reynolds number, and characteristic temperature ratio; the second correlation expresses the forced convection heat transfer coefficient as a function of fluid temperature, pressure and velocity. 10 references.

  2. Synchronous motor with soft start element formed between the motor rotor and motor output shaft to successfully synchronize loads that have high inertia and/or high torque

    DOE Patents [OSTI]

    Umans, Stephen D; Nisley, Donald L; Melfi, Michael J

    2014-10-28

    A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.

  3. Modeling Creep-Fatigue-Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultra-supercritical Coal Power Plants

    SciTech Connect (OSTI)

    Shen, Chen

    2014-01-20

    The goal of this project is to model creep-fatigue-environment interactions in steam turbine rotor materials for advanced ultra-supercritical (A-USC) coal power Alloy 282 plants, to develop and demonstrate computational algorithms for alloy property predictions, and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions. The nickel based Alloy 282 is selected for this project because it is one of the leading candidate materials for the high temperature/pressure section of an A-USC steam turbine. The methods developed in the project are expected to be applicable to other metal alloys in similar steam/oxidation environments. The major developments are: ? failure mechanism and microstructural characterization ? atomistic and first principles modeling of crack tip oxygen embrittlement ? modeling of gamma prime microstructures and mesoscale microstructure-defect interactions ? microstructure and damage-based creep prediction ? multi-scale crack growth modeling considering oxidation, viscoplasticity and fatigue The technology developed in this project is expected to enable more accurate prediction of long service life of advanced alloys for A-USC power plants, and provide faster and more effective materials design, development, and implementation than current state-of-the-art computational and experimental methods. This document is a final technical report for the project, covering efforts conducted from January 2011 to January 2014.

  4. Hydrodynamic Effects on Modeling and Control of a High Temperature Active Magnetic Bearing Pump with a Canned Rotor

    SciTech Connect (OSTI)

    Melin, Alexander M; Kisner, Roger A; Fugate, David L; Holcomb, David Eugene

    2015-01-01

    Embedding instrumentation and control Embedding instrumentation and control (I\\&C) at the component level in nuclear power plants can improve component performance, lifetime, and resilience by optimizing operation, reducing the constraints on physical design, and providing on-board prognostics and diagnostics. However, the extreme environments that many nuclear power plant components operate in makes embedding instrumentation and control at the component level difficult. Successfully utilizing embedded I\\&C requires developing a deep understanding of the system's dynamics and using that knowledge to overcome material and physical limitations imposed by the environment. In this paper, we will develop a coupled dynamic model of a high temperature (700 $^\\circ$C) canned rotor pump that incorporates rotordynamics, hydrodynamics, and active magnetic bearing dynamics. Then we will compare two control design methods, one that uses a simplified decoupled model of the system and another that utilizes the full coupled system model. It will be seen that utilizing all the available knowledge of the system dynamics in the controller design yield an order of magnitude improvement in the magnitude of the magnetic bearing response to disturbances at the same level of control effort, a large reduction in the settling time of the system, and a smoother control action.

  5. Sensitivity of transitions in internal rotor molecules to a possible variation of the proton-to-electron mass ratio

    SciTech Connect (OSTI)

    Jansen, Paul; Ubachs, Wim; Bethlem, Hendrick L. [Institute for Lasers, Life and Biophotonics, VU University Amsterdam, De Boelelaan 1081, NL-1081 HV Amsterdam (Netherlands); Kleiner, Isabelle [Laboratoire Interuniversitaire des Systemes Atmospheriques (LISA), CNRS UMR 7583 et Universites Paris 7 et Paris Est, 61 avenue du General de Gaulle, FR-94010 Creteil Cedex (France); Xu, Li-Hong [Department of Physics and Centre for Laser, Atomic, and Molecular Sciences, University of New Brunswick, Saint John, New Brunswick, Canada E2L 4L5 (Canada)

    2011-12-15

    Recently, methanol was identified as a sensitive target system to probe variations of the proton-to-electron mass ratio {mu}[Jansen et al., Phys. Rev. Lett. 106, 100801 (2011)]. The high sensitivity of methanol originates from the interplay between overall rotation and hindered internal rotation of the molecule; that is, transitions that convert internal rotation energy into overall rotation energy, or vice versa, have an enhanced sensitivity coefficient, K{sub {mu}}. As internal rotation is a common phenomenon in polyatomic molecules, it is likely that other molecules display similar or even larger effects. In this paper we generalize the concepts that form the foundation of the high sensitivity in methanol and use this to construct an approximate model which makes it possible to estimate the sensitivities of transitions in internal rotor molecules with C{sub 3v} symmetry, without performing a full calculation of energy levels. We find that a reliable estimate of transition sensitivities can be obtained from the three rotational constants (A, B, and C) and three torsional constants (F, V{sub 3}, and {rho}). This model is verified by comparing obtained sensitivities for methanol, acetaldehyde, acetamide, methyl formate, and acetic acid with a full analysis of the molecular Hamiltonian. Of the molecules considered, methanol is by far the most suitable candidate for laboratory and cosmological tests searching for a possible variation of {mu}.

  6. Cold collisions of highly rotationally excited CO{sub 2} with He: The prospects for cold chemistry with super-rotors

    SciTech Connect (OSTI)

    Al-Qady, W. H.; Forrey, R. C.; Yang, B. H.; Stancil, P. C.; Balakrishnan, N.

    2011-11-15

    Building on recent advances in ultrafast lasers and methods to slow molecules, an experiment is proposed to produce translationally cold CO{sub 2} super-rotors (j{approx}200) by combining an optical centrifuge with helium-buffer-gas cooling. Quantum mechanical calculations of the complex scattering length for He-CO{sub 2} collisions demonstrate that the efficiency of rotational quenching decreases rapidly with increasing rotational excitation j in the ultracold regime. Extrapolating to helium cryogenic temperatures, rotational quenching is predicted to remain inefficient up to {approx}1 K, allowing for the possible creation of a beam of translationally cold, rotationally hot molecules.

  7. Backward Precessional Whip and Whirl for a Two Point Rubbing Contact Model of a Rigid Rotor Supported by an Elastically Supported Rigid Stator 

    E-Print Network [OSTI]

    Kumar, Dhruv Dileep

    2011-10-21

    ............................................ 67 20 Disk at Overhang Location RClL= 100, RClR=125 .................................... 71 21 Disk at Overhang Location RClL= 125, RClR=100 .................................... 76 FIGURE... ,sL sLK c ,sR sRK c sX? sl sXLr sXRr scxr 13 2.1.2 Stator Equations of Motion Using a similar approach, the stator equations of motion will be derived. Figure 3(b) illustrates the rotor and stator models, together...

  8. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B.; Sidi-Yekhlef, Ahmed; Schwall, Robert E.; Driscoll, David I.; Shoykhet, Boris A.

    2004-11-02

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  9. Superconductor rotor cooling system

    DOE Patents [OSTI]

    Gamble, Bruce B. (Wellesley, MA); Sidi-Yekhlef, Ahmed (Framingham, MA); Schwall, Robert E. (Northborough, MA); Driscoll, David I. (South Euclid, OH); Shoykhet, Boris A. (Beachwood, OH)

    2002-01-01

    A system for cooling a superconductor device includes a cryocooler located in a stationary reference frame and a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with a rotating reference frame in which the superconductor device is located. A method of cooling a superconductor device includes locating a cryocooler in a stationary reference frame, and transferring heat from a superconductor device located in a rotating reference frame to the cryocooler through a closed circulation system external to the cryocooler. The closed circulation system interfaces the stationary reference frame with the rotating reference frame.

  10. Sandia Energy - Rotor Innovation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal EnergyRenewable Energy IntegrationRisk andDesign Tools

  11. Optimum propeller wind turbines

    SciTech Connect (OSTI)

    Sanderson, R.J.; Archer, R.D.

    1983-11-01

    The Prandtl-Betz-Theodorsen theory of heavily loaded airscrews has been adapted to the design of propeller windmills which are to be optimized for maximum power coefficient. It is shown that the simpler, light-loading, constant-area wake assumption can generate significantly different ''optimum'' performance and geometry, and that it is therefore not appropriate to the design of propeller wind turbines when operating in their normal range of high-tip-speed-to-wind-speed ratio. Design curves for optimum power coefficient are presented and an example of the design of a typical two-blade optimum rotor is given.

  12. Structural health and prognostics management for offshore wind turbines : case studies of rotor fault and blade damage with initial O&M cost modeling.

    SciTech Connect (OSTI)

    Myrent, Noah J.; Kusnick, Joshua F.; Barrett, Natalie C.; Adams, Douglas E.; Griffith, Daniel Todd

    2013-04-01

    Operations and maintenance costs for offshore wind plants are significantly higher than the current costs for land-based (onshore) wind plants. One way to reduce these costs would be to implement a structural health and prognostic management (SHPM) system as part of a condition based maintenance paradigm with smart load management and utilize a state-based cost model to assess the economics associated with use of the SHPM system. To facilitate the development of such a system a multi-scale modeling approach developed in prior work is used to identify how the underlying physics of the system are affected by the presence of damage and faults, and how these changes manifest themselves in the operational response of a full turbine. This methodology was used to investigate two case studies: (1) the effects of rotor imbalance due to pitch error (aerodynamic imbalance) and mass imbalance and (2) disbond of the shear web; both on a 5-MW offshore wind turbine in the present report. Based on simulations of damage in the turbine model, the operational measurements that demonstrated the highest sensitivity to the damage/faults were the blade tip accelerations and local pitching moments for both imbalance and shear web disbond. The initial cost model provided a great deal of insight into the estimated savings in operations and maintenance costs due to the implementation of an effective SHPM system. The integration of the health monitoring information and O&M cost versus damage/fault severity information provides the initial steps to identify processes to reduce operations and maintenance costs for an offshore wind farm while increasing turbine availability, revenue, and overall profit.

  13. Sandia Energy - Rotor Aerodynamic Design

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal EnergyRenewable Energy IntegrationRisk and SafetyAerodynamic

  14. Sandia Energy - Rotor Design Tools

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal EnergyRenewable Energy IntegrationRisk andDesign Tools Home

  15. Sandia Energy - SMART Rotor Video

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal EnergyRenewable Energy IntegrationRiskProgramSF-BREEZESMART

  16. Methods of making wind turbine rotor blades

    DOE Patents [OSTI]

    Livingston, Jamie T. (Pensacola, FL); Burke, Arthur H. E. (Gulf Breeze, FL); Bakhuis, Jan Willem (Nijverdal, NL); Van Breugel, Sjef (Enschede, NL); Billen, Andrew (Daarlerveen, NL)

    2008-04-01

    A method of manufacturing a root portion of a wind turbine blade includes, in an exemplary embodiment, providing an outer layer of reinforcing fibers including at least two woven mats of reinforcing fibers, providing an inner layer of reinforcing fibers including at least two woven mats of reinforcing fibers, and positioning at least two bands of reinforcing fibers between the inner and outer layers, with each band of reinforcing fibers including at least two woven mats of reinforcing fibers. The method further includes positioning a mat of randomly arranged reinforcing fibers between each pair of adjacent bands of reinforcing fibers, introducing a polymeric resin into the root potion of the wind turbine blade, infusing the resin through the outer layer, the inner layer, each band of reinforcing fibers, and each mat of random reinforcing fibers, and curing the resin to form the root portion of the wind turbine blade.

  17. Rotor assembly including superconducting magnetic coil

    DOE Patents [OSTI]

    Snitchler, Gregory L. (Shrewsbury, MA); Gamble, Bruce B. (Wellesley, MA); Voccio, John P. (Somerville, MA)

    2003-01-01

    Superconducting coils and methods of manufacture include a superconductor tape wound concentrically about and disposed along an axis of the coil to define an opening having a dimension which gradually decreases, in the direction along the axis, from a first end to a second end of the coil. Each turn of the superconductor tape has a broad surface maintained substantially parallel to the axis of the coil.

  18. Optimum rotationally symmetric shells for flywheel rotors

    DOE Patents [OSTI]

    Blake, Henry W. (Oak Ridge, TN)

    2000-01-01

    A flywheel rim support formed from two shell halves. Each of the shell halves has a disc connected to the central shaft. A first shell element connects to the disc at an interface. A second shell element connects to the first shell element. The second shell element has a plurality of meridional slits. A cylindrical shell element connects to the second shell element. The cylindrical shell element connects to the inner surface of the flywheel rim. A flywheel rim support having a disc connected an outer diameter of a shaft. Two optimally shaped shell elements connect to the optimally shaped disc at an interface. The interface defines a discontinuity in a meridional slope of said support. A cylindrical shell element connects to the two shell elements. The cylindrical shell element has an outer surface for connecting to the inner surface of the flywheel rim. A flywheel rim casing includes an annular shell connected to the central shaft. The annular shell connects to the flywheel rim. A composite shell surrounds the shaft, annular shell and flywheel rim.

  19. Sandia Energy - Rotor Blade Sensors and Instrumentation

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal EnergyRenewable Energy IntegrationRisk and

  20. The Operational Sex Ratio, theThe Operational Sex Ratio, the Potential Reproductive Rate, andPotential Reproductive Rate, and

    E-Print Network [OSTI]

    Shuster, Stephen M.

    of each sex willing (or able) to mate at any given time (Kemp & Macedonia 2006) The "Operational Sex Ratio 1999; Kemp & Macedonia 2007) Mate selection and choosiness: (Rosenqvist 1993; Berglund 1994; Kokko

  1. Design, Fabrication, Assembly and Initial Testing of a SMART Rotor

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalent BondingMeeting |Design Competitions Designthe 29 th ASME Wind

  2. The rotor-oscillator flow : searching for coherence amidst chaos

    E-Print Network [OSTI]

    Fay, Sarah (Sarah C.)

    2015-01-01

    Chaotic mixing of highly viscous fluids is common in many biological and industrial processes. This study aims to gain insight about the properties of such common processes by examining one particular case of viscous, ...

  3. Control of an Active Magnetic Bearing-Rotor System

    E-Print Network [OSTI]

    Kang, Christopher

    2014-01-01

    To my colleagues in the Mechatronics and Controls Laboratoryphase Systems. ” Mechatronics, 22(5):577–587, August 2012. [in Digital Control. ” Mechatronics, IEEE/ASME Transactions

  4. Turbine rotor-stator leaf seal and related method

    DOE Patents [OSTI]

    Herron, William Lee (Cincinnati, OH); Butkiewicz, Jeffrey John (Simpsonville, SC)

    2003-01-01

    A seal assembly for installation between rotating and stationary components of a machine includes a first plurality of leaf spring segments secured to the stationary component in a circumferential array surrounding the rotating component, the leaf spring segments each having a radial mounting portion and a substantially axial sealing portion, the plurality of leaf spring segments shingled in a circumferential direction.

  5. Bore tube assembly for steam cooling a turbine rotor

    DOE Patents [OSTI]

    DeStefano, Thomas Daniel (Ballston Lake, NY); Wilson, Ian David (Clifton Park, NY)

    2002-01-01

    An axial bore tube assembly for a turbine is provided to supply cooling steam to hot gas components of the turbine wheels and return the spent cooling steam. A pair of inner and outer tubes define a steam supply passage concentric about an inner return passage. The forward ends of the tubes communicate with an end cap assembly having sets of peripheral holes communicating with first and second sets of radial tubes whereby cooling steam from the concentric passage is supplied through the end cap holes to radial tubes for cooling the buckets and return steam from the buckets is provided through the second set of radial tubes through a second set of openings of the end cap into the coaxial return passage. A radial-to-axial flow transitioning device, including anti-swirling vanes is provided in the end cap. A strut ring adjacent the aft end of the bore tube assembly permits axial and radial thermal expansion of the inner tube relative to the outer tube.

  6. Phase modulated rotor angle encoder for switched reluctance motor drive 

    E-Print Network [OSTI]

    Mahajan, Shailendra

    1993-01-01

    Advantages of the switched reluctance motor (SRM) drive makes it an attractive candidate for replacing many adjustable speed ac and dc drives, in both industrial and consumer applications. The switched reluctance drives ...

  7. Asymmetric rotor analysis of DSOD spectra up to the r

    E-Print Network [OSTI]

    Giesen, Thomas

    West, Onagawa l6-1, Tsukuba 305-8569, Japan Received 17 January 2005; revised 18 January 2005; accepted, the a-type transitions are expected to appear at most only in the microwave and in the longer millimeter-wave of discharge-generated DSOD. At that time we had observed the r Q0 and r Q2 branches. The r Q3 branch

  8. DOE and Sandia National Laboratories Develop National Rotor Testbed...

    Broader source: Energy.gov (indexed) [DOE]

    interaction research that will increase the efficiency of wind power plants and lower the cost of electricity. The SWiFT facility, which was commissioned this July, is...

  9. SMART Wind Turbine Rotor: Data Analysis and Conclusions

    Energy Savers [EERE]

    "cRIO". The third RBU subsystem was an sm130 fiber optic interrogator from Micron Optics 52 which was named "Micron Optics Interrogator" or "MOI". Additional information on...

  10. CFD Simulation of the NREL Phase VI Rotor

    E-Print Network [OSTI]

    Song, Yang

    2014-01-01

    The simulation of the turbulent and potentially separating flow around a rotating, twisted, and tapered airfoil is a challenging task for CFD simulations. This paper describes CFD simulations of the NREL Phase VI turbine that was experimentally characterized in the 24.4m x 36.6m NREL/NASA Ames wind tunnel (Hand et al., 2001). All computations in this article are performed on the experimental base configuration of 0o yaw angle, 3o tip pitch angle, and a rotation rate of 72 rpm. The significance of specific mesh resolution regions to the accuracy of the CFD prediction is discussed. The ability of CFD to capture bulk quantities, such as the shaft torque, and the detailed flow characteristics, such as the surface pressure distributions, are explored for different inlet wind speeds. Finally, the significant three-dimensionality of the boundary layer flow is demonstrated.

  11. Connector tube for a turbine rotor cooling circuit

    DOE Patents [OSTI]

    Li, Ming Cheng (Cincinnati, OH)

    2003-06-24

    A tubular connector adapted to extend between two tubular components comprising a tubular body having an internal diameter, a first free end including an annular radial flange having a tapered surface adapted to engage a complementary seating surface on a first of the two tubular components, the internal diameter remaining constant through the first free end; and a second free end having an annular bulbous shape adapted to seat within a cylindrical end of a second of the two tubular components.

  12. Full-scale wind turbine rotor aerodynamics research

    SciTech Connect (OSTI)

    Simms, D A; Butterfield, C P

    1994-11-01

    The United States Department of Energy and the National Renewable Energy Laboratory (NREL) are conducting research to improve wind turbine technology at the NREL National Wind Technology Center (NWTC). One program, the Combined Experiment, has focused on making measurements needed to understand aerodynamic and structural responses of horizontal-axis wind turbines (HAWT). A new phase of this program, the Unsteady Aerodynamics Experiment, will focus on quantifying unsteady aerodynamic phenomena prevalent in stall-controlled HAWTs. Optimally twisted blades and innovative instrumentation and data acquisition systems will be used in these tests. Data can now be acquired and viewed interactively during turbine operations. This paper describes the NREL Unsteady Aerodynamics Experiment and highlights planned future research activities.

  13. National Rotor Testbed Targets Future Wind Plant Research Needs |

    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:Financing Tool Fits the BillDepartmentSites KDFNational Fuel CellAugust 2008) ToDepartment of

  14. SMART Wind Turbine Rotor: Data Analysis and Conclusions | Department of

    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 RankADVANCED MANUFACTURINGEnergy BillsNo. 195 -Rob Roberts AboutSLED-Fact-Sheet.pdfEnergyEnergy Data

  15. PN Rotor GmbH | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX ECoop Inc Jump to:Newberg,Energy LLC Jump to: navigation, searchPCSPEPCOLLC

  16. Substantially Parallel Flux Uncluttered Rotor Machines (U-Machine) - Energy

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect PhotovoltaicsStructureInnovation Portal Substantially Parallel Flux

  17. SMART Wind Turbine Rotor: Data Analysis and Conclusions | Department of

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust, High-Throughput Analysis of Protein1-0845*RV 14800 ModificationSJTEnergy

  18. Sandia Energy - Structural and Mechanical Adaptive Rotor Technology

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust, High-Throughput AnalysisSinkhole OfficialsWorkSensorsEnergy(SMART) Final Project

  19. DOE and Sandia National Laboratories Develop National Rotor Testbed |

    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:FinancingPetroleum Based| Department8, 2015 GATEWAY Takes 9.NewExtremeand NREL

  20. Hybrid Rotor Compression for Multiphase and Liquids-Rich Wellhead

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (JournalvivoHighHussein Khalil Hussein Khalil Director of FindHybridHybridto

  1. Field Test Results from the Sandia SMART Rotor

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (Journal Article) | SciTechSubmittedEcologist for a Day Field GuideFieldField

  2. Fabrication, Integration and Initial Testing of a SMART Rotor

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submitKansasCommunitiesofExtrans -ORGANIZATION FYMicrotransfer Molding- Energy

  3. Sandia Energy - Innovative Offshore Vertical-Axis Wind Turbine Rotors

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal Energy & DrillingNanomaterialsAssurance HomeInnovative

  4. Sandia Energy - National Rotor Testbed Functional Scaling Presented at

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal Energy &Water Power&GridMonitoring

  5. Comparison of a Slanted-Tooth See-Through Labyrinth Seal to a Straight-Tooth See-Through Labyrinth Seal for Rotordynamic Coefficients and Leakage 

    E-Print Network [OSTI]

    Mehta, Naitik

    2012-07-16

    -a (1015 psi-a), pressure ratios of 0.4, 0.5, and 0.6, rotor speeds of 10,200, 15,350, and 20,200 rpm, and a radial clearance of 0.2 mm (8 mils). The experiments were carried out at zero, medium, and high inlet preswirl ratios. The experimental results...

  6. Cushing Library - 80 

    E-Print Network [OSTI]

    Unknown

    2009-01-01

    -a (1015 psi-a), pressure ratios of 0.4, 0.5, and 0.6, rotor speeds of 10,200, 15,350, and 20,200 rpm, and a radial clearance of 0.2 mm (8 mils). The experiments were carried out at zero, medium, and high inlet preswirl ratios. The experimental results...

  7. Preliminary design and viability consideration of external, shroud-based stators in wind turbine generators

    E-Print Network [OSTI]

    Shoemaker-Trejo, Nathaniel (Nathaniel Joseph)

    2012-01-01

    Horizontal-axis wind turbine designs often included gearboxes or large direct-drive generators to compensate for the low peripheral speeds of the turbine hub. To take advantage of high blade tip speeds, an alternative ...

  8. Identification of airfoil characteristics for optimum wind turbine performance / b 

    E-Print Network [OSTI]

    Miller, Leonard Scott

    1983-01-01

    with a performance optimization routine was used to perform the analyses. The relationship between airfoil lift and drag characteristics and turbine performance was determined and discussed. High lift and low drag was found to improve, respectively..., the low and high tip speed ratio power output of the tur bine. An investigation using the NACA 63 series family showed that airfoils with 12 to 15 percent thickness should generate good performance over a broad range of tip speed ratios. iv...

  9. Sensitivity Analysis of Offshore Wind Cost of Energy (Poster)

    SciTech Connect (OSTI)

    Dykes, K.; Ning, A.; Graf, P.; Scott, G.; Damiami, R.; Hand, M.; Meadows, R.; Musial, W.; Moriarty, P.; Veers, P.

    2012-10-01

    No matter the source, offshore wind energy plant cost estimates are significantly higher than for land-based projects. For instance, a National Renewable Energy Laboratory (NREL) review on the 2010 cost of wind energy found baseline cost estimates for onshore wind energy systems to be 71 dollars per megawatt-hour ($/MWh), versus 225 $/MWh for offshore systems. There are many ways that innovation can be used to reduce the high costs of offshore wind energy. However, the use of such innovation impacts the cost of energy because of the highly coupled nature of the system. For example, the deployment of multimegawatt turbines can reduce the number of turbines, thereby reducing the operation and maintenance (O&M) costs associated with vessel acquisition and use. On the other hand, larger turbines may require more specialized vessels and infrastructure to perform the same operations, which could result in higher costs. To better understand the full impact of a design decision on offshore wind energy system performance and cost, a system analysis approach is needed. In 2011-2012, NREL began development of a wind energy systems engineering software tool to support offshore wind energy system analysis. The tool combines engineering and cost models to represent an entire offshore wind energy plant and to perform system cost sensitivity analysis and optimization. Initial results were collected by applying the tool to conduct a sensitivity analysis on a baseline offshore wind energy system using 5-MW and 6-MW NREL reference turbines. Results included information on rotor diameter, hub height, power rating, and maximum allowable tip speeds.

  10. Method and apparatus for starting supersonic compressors

    DOE Patents [OSTI]

    Lawlor, Shawn P. (Bellevue, WA)

    2012-04-10

    A supersonic gas compressor. The compressor includes aerodynamic duct(s) situated on a rotor journaled in a casing. The aerodynamic duct(s) generate a plurality of oblique shock waves for efficiently compressing a gas at supersonic conditions. The convergent inlet is adjacent to a bleed air collector, and during acceleration of the rotor, bypass gas is removed from the convergent inlet via a collector to enable supersonic shock stabilization. Once the oblique shocks are stabilized at a selected inlet relative Mach number and pressure ratio, the bleed of bypass gas from the convergent inlet via the bypass gas collectors is eliminated.

  11. Exogenous shocks to the human sex ratio: the case of September 11, 2001 in New York City.

    E-Print Network [OSTI]

    Catalano, R; Bruckner, T; Marks, A R; Eskenazi, B

    2006-01-01

    case of September 11, 2001 in New York City R.Catalano 1 ,of September 11 in New York City. METHODS: We replicate theto 91 cohorts born in New York City during 28-day periods

  12. A tilt rotor UAV for long endurance operations in remote environments

    E-Print Network [OSTI]

    VanderMey, Josiah T

    2011-01-01

    Extended mission times will greatly expand the utility of small UAVs that are currently limited to a single flight lasting no more than a few hours. This thesis assesses the challenges to developing a small, long endurance ...

  13. Observer for the Rotor Temperature of IPMSM Andreas Specht, Joachim Bocker

    E-Print Network [OSTI]

    Noé, Reinhold

    hybrid drive-trains mostly include inte- rior permanent magnet synchronous machines (IPMSM). This type Terms--Automotive application, Electrical machine, Estimation technique, Flux model, Hybrid electric vehicle (HEV), Permanent magnet motor, Synchronous motor, Ther- mal stress I. INTRODUCTION Today's modern

  14. A two-factor saturation model for synchronous machines with multiple rotor circuits

    SciTech Connect (OSTI)

    Tahan, S.A. [Universite Laval, Quebec (Canada)] [Universite Laval, Quebec (Canada); Kamwa, I. [Institut de Recherche d`Hydro-Quebec, Varennes, Quebec (Canada)] [Institut de Recherche d`Hydro-Quebec, Varennes, Quebec (Canada)

    1995-12-01

    It is generally felt that no major accuracy break-through in predicting the steady-state and transient performance of synchronous machines could be achieved without taking proper account of the iron saturation effects as well as eddy-current losses. Although the two issues were often treated separately in the past, this paper attempts to unite them by developing a general model covering both the main-path magnetic saturation and frequency effects in the dynamic equations. Mathematical analysis in the d-q space pinpoints cross-saturation coupling which, a priori, does not seem to be symmetrical for salient-pole machines. Yet the model is theoretically sound, since it fulfills at least the physical constraints using energy balance principles. Some test points from a 555-MVA turbine-generator are used for an initial assessment of the model`s capability to predict the field current and internal angle for various loading conditions.

  15. Synthesis and characterization of molecular rotors as viscosity sensors and beta amyloid binding agents

    E-Print Network [OSTI]

    Sutharsan, Jeyanthy

    2009-01-01

    Synthesis and Evaluation as Viscosity Sensors IntroductionSynthesis and Evaluation as Viscosity Sensors14and evaluation of these compounds as viscosity sensors. The

  16. The effect of adding axial freedom to the blades of a two bladed helicopter rotor 

    E-Print Network [OSTI]

    Oradat, Frank Robert

    1953-01-01

    &&ring of the hei art- ment of Ilecnariical Err& neerin:. Nr. E. E. Brush, Nr. P. E. Weick, Nr. R. B. Hulet, Mr. B. B. Ha&sr&sr, i~u-. Te&i Neiller, arid iMr. G. A. Ii?tn oi' tris I egart- ment of Aer&n?utical EnHineerinS. Nr. W. D. Scoates and Nr. W, P. Meads...? the dray nin=e, vith tne fl, &g g in!- ri n. "e on tne nla?e; tnus tne efi'ect of fl q pine. on pitch voulc! be eli, ~in?ted. Insteaa of 'isin, a I ericil on inie ?ynanic vibrats on indic&itor, the ?sf le t3 orr sr&oui? be f. . d to tire y lates oi' iri...

  17. The effect of imbalance distribution and measurement locations on critical speeds in a turboprop engine rotor 

    E-Print Network [OSTI]

    Marin, Manuel

    1996-01-01

    The critical speeds of a turbomachine can be defined as the speeds at which synchronous response to imbalance is maximum (Vance,1988). Identifying the proper placement of critical speeds is very important in the design process of turbomachinery...

  18. Reduction of multi-stage disk models: Application to an industrial rotor

    E-Print Network [OSTI]

    Boyer, Edmond

    in "Journal of Engineering for Gas Turbines and Power 131, 1 (2009) 012502" #12;INTRODUCTION This study problem. The first part of this paper updates the methodology developed in9 . This method con- sists to the cyclic modeshapes as defined by Laxalde et al.8 , and the process used to generate the subspaces in which

  19. Measurements of unbalance response in a squeeze film damper test rotor-kit 

    E-Print Network [OSTI]

    Laos, Hector Emilio

    1995-01-01

    was experimentally measured at the top of the SFD and no oil cavitation was detected from the tests. However, air entrainment was clearly observed while passing through the system resonant speed. Theoretical pressure distribution plots from a "short bearing" model...

  20. An efficient algorithm for blade loss simulations applied to a high-order rotor dynamics problem 

    E-Print Network [OSTI]

    Parthasarathy, Nikhil Kaushik

    2004-09-30

    and accurate predictions of whirl amplitudes, maximum contact load and stress in the bearings, transmissibility, thermal growths, maximum and minimum damper pressures and the amount of unbalanced force for incipient oil film cavitation. It requires about 4...

  1. Quantum diffusion dynamics in nonlinear systems: A modified kicked-rotor model

    SciTech Connect (OSTI)

    Gong Jiangbin [Department of Physics and Centre of Computational Science and Engineering, National University of Singapore, 117542 (Singapore); Wang Jiao [Temasek Laboratories and Beijing-Hong Kong-Singapore Joint Center for Nonlinear and Complex Systems (Singapore), National University of Singapore, 117542 (Singapore)

    2007-09-15

    Using a simple method analogous to a quantum rephasing technique, a simple modification to a paradigm of classical and quantum chaos is proposed. The interesting quantum maps thus obtained display remarkably rich quantum dynamics. Emphasis is placed on the destruction of dynamical localization without breaking periodicity, unbounded quantum anomalous diffusion in integrable systems, and transient dynamical localization. Experimental realizations of this work are also discussed.

  2. Localization-Delocalization Transition in a System of Quantum Kicked Rotors

    SciTech Connect (OSTI)

    Creffield, C.E.; Hur, G.; Monteiro, T.S. [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)

    2006-01-20

    The quantum dynamics of atoms subjected to pairs of closely spaced {delta} kicks from optical potentials are shown to be quite different from the well-known paradigm of quantum chaos, the single {delta}-kick system. We find the unitary matrix has a new oscillating band structure corresponding to a cellular structure of phase space and observe a spectral signature of a localization-delocalization transition from one cell to several. We find that the eigenstates have localization lengths which scale with a fractional power L{approx}({Dirac_h}/2{pi}){sup -0.75} and obtain a regime of near-linear spectral variances which approximate the 'critical statistics' relation {sigma}{sub 2}(L){approx_equal}{chi}L{approx_equal}(1/2)(1-{nu})L, where {nu}{approx_equal}0.75 is related to the fractal classical phase-space structure. The origin of the {nu}{approx_equal}0.75 exponent is analyzed.

  3. Effects of rotor blade modulation on GNSS anti-jamming algorithms

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , France) in 1998. After having been involved in the development of radiofrequency front-end for GPS for the development of controlled radiated pattern antenna products. ABSTRACT In hostile environment, Global

  4. Multi-piece wind turbine rotor blades and wind turbines incorporating same

    DOE Patents [OSTI]

    Moroz; Emilian Mieczyslaw (San Diego, CA) [San Diego, CA

    2008-06-03

    A multisection blade for a wind turbine includes a hub extender having a pitch bearing at one end, a skirt or fairing having a hole therethrough and configured to mount over the hub extender, and an outboard section configured to couple to the pitch bearing.

  5. APPLICATION OF A SYMMETRIC TOTAL VARIATION DIMINISHING SCHEME TO AERODYNAMICS OF ROTORS

    E-Print Network [OSTI]

    and present members of CFD lab for their warm friendship and support during my years in the lab. I am thanks to the former and present members of our CFD Lab: Saeid Niazi, Alex Stein, Mehmet Sahin, Guanpeng Benjanirat, and Sujeet Phanse. I would also like to thank my friends and colleagues in the Combustion Lab

  6. Gibbsianness versus Non-Gibbsianness of time-evolved planar rotor models

    E-Print Network [OSTI]

    enough. Le Ny and Redig generalized in [LeNRed02] the result for small times t to more general dynamics

  7. Sandia Energy - Offshore Wind RD&D: Large Offshore Rotor Development

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

    utilized balsa in critical buckling areas (Trailing Edge Panel: Inboard) and PET foam in the non-critical buckling areas (Trailing Edge Panel: Outboard), as shown in the...

  8. Evaluation of Demo 1C composite flywheel rotor burst test and containment design

    SciTech Connect (OSTI)

    Kass, M.D.; McKeever, J.W.; Akerman, M.A.; Goranson, P.L.; Litherland, P.S.; O`Kain, D.U.

    1998-07-01

    Laboratory-Directed funds were provided in FY 1995 for research to develop flywheel containment specifications and to consider concepts that could satisfy these specifications and produce a prototype small, lightweight, inexpensive, mobile flywheel containment. Research activities have included an analytical and pictorial review of the Demo 1C flywheel failure test, which provided significant insight about radial and axial failure modes; calculations of the thickness of ultra-conservative pressure vessel containment; entertainment of advanced containment concepts using lightweight materials and armor literature; consideration of fabrication assembly procedures; and participation in a Flywheel Energy Storage Workshop during which additional flywheel failure experiences were discussed. Based on these activities, calculations, and results, a list of conclusions concerning flywheel containment and its relation to the flywheel are presented followed by recommendations for further research.

  9. Genetic icing effects on forward flight performance of a model helicopter rotor 

    E-Print Network [OSTI]

    Tinetti-Sanchez, Ana Fiorella

    1987-01-01

    introduces decrements in performance caused by leading edge separation regions and increased surface roughness, In addition to the expected changes in aerodynamic forces caused by var- iations in test Reynolds number, forward flight data seemed to be in... coefficient CT - thrust coefficient CY - Y-force coefficient c - blade chord c~ - section lift coefficient cd - section drag coefficient D - drag (wind axis) De - equivalent drag Dp - profile drag FM - Figure of Merit F - section radial aerodynamic...

  10. Rotor Termination in a Patient-Specific Model of Atrial Fibrillation /

    E-Print Network [OSTI]

    Gonzales, Matthew James

    2013-01-01

    of atrial fibrillation termination by rapidly unbinding Na+of atrial fibrillation termination by pure sodium channelfor spontaneous termination of reentrant tachycardias.

  11. Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise

    E-Print Network [OSTI]

    Defoe, Jeff (Jeffrey James)

    2011-01-01

    A body-force-based fan model for the prediction of multiple-pure-tone noise generation is developed in this thesis. The model eliminates the need for a full-wheel, three-dimensional unsteady RANS simulation of the fan blade ...

  12. NONLINEAR DYNAMIC ANALYSIS OF A CRACKED ROTOR-BEARING SYSTEM WITH FRACTIONAL ORDER DAMPING

    E-Print Network [OSTI]

    Chen, YangQuan

    and Cybernetics, School of Mechanical engineering, Xi'an Jiaotong University, Xi'an 710049, China 363554322a@163 of Diagnostics and Cybernetics, School of Mechanical engineering, Xi'an Jiaotong University, Xi'an 710049, China Xue State Key Laboratory for Manufacturing Systems Engineering, Research Institute of Diagnostics

  13. Analytical determination of performance degradation on a helicopter main rotor due to ice accretion 

    E-Print Network [OSTI]

    Camba, Javier

    1986-01-01

    artificial icing tests Canada's National Research Council (NRC) Icing Tunnel and simulated ice tests the OSU Transonic Airfoil Facility using a irfo'1 1 s inbicitave of current rotorcraft technol ogy. The final correlations are: Lift Increment Prediction...

  14. Hybrid gas bearings with controlled supply pressure to eliminate rotor vibrations while crossing system critical speeds 

    E-Print Network [OSTI]

    Ryu, Keun

    2009-05-15

    gas bearings provide a simple solution to overcome excessive drag and allowing rub-free operation during transient response events. Some commercial MTM currently implements gas foil bearings, a costly proprietary technology with few, if any, proven...

  15. Measurements of imbalance response for a rigid rotor fully supported on squeeze film dampers 

    E-Print Network [OSTI]

    Lubell, Daniel Roger

    2000-01-01

    Modern high performance turbomachinery providing increased power to weight ratios and larger efficiencies are designed to operate at higher speeds than prior designs. These machines are more sensitive to imbalance since they must traverse critical...

  16. Imbalance response of a rotor supported on a floating ring fluid film bearing 

    E-Print Network [OSTI]

    Naranjo, Julio Enrique

    1999-01-01

    as lubricant. FRBs are comprised of an inner and outer thin lubricated films in series, and offer lower power losses and also cooler operation conditions than a single-land hydrodynamic journal bearing (Wilcock, 1983). FRBs are also very attractive...

  17. GEOMETRY TIP CAP EFFECTS ON FORMATION AND NEAR WAKE EVOLUTION OF THE ROTOR TIP VORTICES

    E-Print Network [OSTI]

    blade tip cap. PIV measurements of the crossflow velocities around the forming tip vortex were performed

  18. Numerical Simulation of Combustion and Rotor-Stator Interaction in a Turbine Combustor

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Isvoranu, Dragos D.; Cizmas, Paul G. A.

    2003-01-01

    This article presents the development of a numerical algorithm for the computation of flow and combustion in a turbine combustor. The flow and combustion are modeled by the Reynolds-averaged Navier-Stokes equations coupled with the species-conservation equations. The chemistry model used herein is a two-step, global, finite-rate combustion model for methane and combustion gases. The governing equations are written in the strong conservation form and solved using a fully implicit, finite-difference approximation. The gas dynamics and chemistry equations are fully decoupled. A correction technique has been developed to enforce the conservation of mass fractions. The numerical algorithm developed herein has beenmore »used to investigate the flow and combustion in a one-stage turbine combustor.« less

  19. Nonlinear Dynamics of a Rotor Supported by Homopolar Magnetic Bearings with Saturation 

    E-Print Network [OSTI]

    Kang, Kyungdae

    2011-02-22

    control loop that includes low pass filter effects. An analytical magnetization curve model is proposed to predict the nonlinear magnetic force under the influence of the magnetic flux saturation more accurately. The modified Langmuir method with the novel...

  20. Contribution of restricted rotors to quantum sieving of hydrogen isotopes B. C. Hathorn,1

    E-Print Network [OSTI]

    Hathorn, Bryan C.

    , energy intensive, and expensive, and new methods of efficient isotope separation, which are cheap of isotopically substituted hydrogen molecules adsorbed into single-walled car- bon nanotubes are calculated using that the introduction of quantum zero-point energy in the translational coordinates of molecules enclosed in carbon

  1. Imbalance response of a rigid rotor supported on end sealed integral squeeze film dampers 

    E-Print Network [OSTI]

    De Santiago Duran, Oscar Cesar

    1998-01-01

    Modern turbomachinery design directs towards the ographics. generation or utilization of increasing amounts of power with the minimum engine weight. High performance turbomachinery requires of appropriate means to ensure ...

  2. Comments on: Aerodynamic Wind-Turbine Blade Design for the National Rotor

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 OutreachProductswsicloudwsiclouddenDVA N C E D BGene NetworkNuclearDNP

  3. SMART Wind Turbine Rotor: Design and Field Test | 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 RankADVANCED MANUFACTURINGEnergy BillsNo. 195 -Rob Roberts AboutSLED-Fact-Sheet.pdfEnergyEnergyDesign

  4. Deutsche Rotor und Turm Service GmbH Co KG DRTS | Open Energy Information

    Open Energy Info (EERE)

    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 QA:QA J-E-1 SECTION J APPENDIX E LISTStar2-0057-EA Jump to: navigation,Department of Defense

  5. SMART Wind Turbine Rotor: Design and Field Test | Department of Energy

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust, High-Throughput Analysis of Protein1-0845*RV 14800 ModificationSJTEnergyDesign and

  6. Investigating Aeroelastic Performance of Multi-Mega Watt Wind Turbine Rotors Using CFD

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACT EVALUATIONIntroducing the Richard P. FeynmanInventors in Action:

  7. Sandia Energy - New Facility Tool at SWiFT Makes Rotor Work More

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal Energy &WaterNew CREW Database Receives First Set of

  8. Sandia Energy - Offshore Wind RD&D: Large Offshore Rotor Development

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II)Geothermal Energy &WaterNew CREW DatabaseNuclearScience

  9. Ultra-high speed vacuum pump system with first stage turbofan and second stage turbomolecular pump

    DOE Patents [OSTI]

    Jostlein, Hans

    2006-04-04

    An ultra-high speed vacuum pump evacuation system includes a first stage ultra-high speed turbofan and a second stage conventional turbomolecular pump. The turbofan is either connected in series to a chamber to be evacuated, or is optionally disposed entirely within the chamber. The turbofan employs large diameter rotor blades operating at high linear blade velocity to impart an ultra-high pumping speed to a fluid. The second stage turbomolecular pump is fluidly connected downstream from the first stage turbofan. In operation, the first stage turbofan operates in a pre-existing vacuum, with the fluid asserting only small axial forces upon the rotor blades. The turbofan imparts a velocity to fluid particles towards an outlet at a high volume rate, but moderate compression ratio. The second stage conventional turbomolecular pump then compresses the fluid to pressures for evacuation by a roughing pump.

  10. Intake system for rotary piston engine

    SciTech Connect (OSTI)

    Tadokoro, T.; Okimoto, H.; Shiraishi, H.; Akagi, T.

    1986-01-07

    This patent describes a two rotor type rotary piston engine consisting of a casing composed of: a pair of rotor housings each having an inner wall of trochoidal configuration; an intermediate housing located between the rotor housings; and a pair of side housings secured to the outer sides of the respective rotor housings to define rotor cavities in the respective rotor housings.

  11. Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems

    E-Print Network [OSTI]

    Boyer, Edmond

    operation regions depending on wind turbines tip speed ratio. They are distinguished by a minimum phase such as robustness to parametric uncertainties of the turbine and the generator as well as to electric grid turbine to evaluate its consistency and performance. The next step was the validation using the NREL

  12. Small-scale wind turbines in cities and suburbs S Tullis, K Aly, R Bravo, A Fiedler, S Kooiman, K McLaren S Ziada

    E-Print Network [OSTI]

    Tullis, Stephen

    -uniform wind into turbine High tip speeds lead to noise #12;Vertical axis wind turbines Combination of blade #12;Horizontal axis small wind turbines Numerous suppliers of turbines for tower/field installationSmall-scale wind turbines in cities and suburbs S Tullis, K Aly, R Bravo, A Fiedler, S Kooiman, K

  13. IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 22, NO. 2, JUNE 2007 431 Control Methodology to Mitigate the Grid Impact

    E-Print Network [OSTI]

    Lehn, Peter W.

    to obtain regulation of the tip-speed ratio for the widest range of frequencies. The methodology thus offers] and contribution to system regulation by wind farms [2], [3] are being studied. It has been commented that the sacrifice of energy capture in order to obtain better control of wind farm power output may become more

  14. 2274 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS, VOL. 9, NO. 4, NOVEMBER 2013 Rotor Bar Fault Monitoring Method Based on

    E-Print Network [OSTI]

    Povinelli, Richard J.

    Monitoring Method Based on Analysis of Air-Gap Torques of Induction Motors Aderiano M. da Silva, Member, IEEE utilizes the data analysis of the air-gap torque profile in conjunction with a Bayesian classifier

  15. IEEE TRANSACTIONS ON MAGNETICS, VOL. 43, NO. 9, SEPTEMBER 2007 3623 Doubly Salient Permanent-Magnet Machine With Skewed Rotor

    E-Print Network [OSTI]

    Mi, Chunting "Chris"

    to control the motor. We validated the feasibility of these new design concepts by simulations, field SALIENT permanent-magnet machine (DSPM), a new kind of inverter-fed electrical traction motor first, such as high efficiency, high power density, and simple structure. Much progress has been made on the design

  16. Vacuum Arc Plasma Motion In A Curvilinear Magnetic Field In A Framework Of The Rigid-Rotor Model

    SciTech Connect (OSTI)

    Timoshenko, Aleksandr I.; Gnybida, Mikhail V.; Taran, Valeriy S.; Tereshin, Vladimir I.; Chechel'nitskij, Oleg G.

    2006-01-15

    Vacuum-arc plasma motion in a toroidal magnetic field is described on a base of steady-state ({partial_derivative}/{partial_derivative}t = 0) Vlasov-Maxwell equations for the long plasma column aligned parallel to a constant axial magnetic field. The relations for the self-consistent electric field, which appears due to a displacement of the electrons from the ions at the curvilinear trajectory, were derived within a framework of the drift approximation. The dynamics of the central part of the plasma flow in the electric polarization fields was considered in detail. The displacement of the plasma flow at the output of the plasma duct was calculated. The results are in a good agreement with the experimental data obtained by others authors.

  17. Heat-flux measurements for the rotor of a full-stage turbine: Part I - Time-averaged results

    SciTech Connect (OSTI)

    Dunn, M.G.

    1986-07-01

    This paper describes time-average heat-flux distributions obtained for the blade of a Garrett TFE 731-2 hp full stage rotating turbine. Blade measurements were obtained both with and without injection. The injected gas was supplied from a separate reservoir and was directed into the turbine gas path via nozzle guide vane (NGV) pressure surface slots located at approximately 63 percent of the wetted distance. Blade heat-flux measurements were performed fro two different injection gas temperatures, T/sub c/T/sub o/ = 0.53 and T/sub c/T/sub o/ - 0.82. A shock tube is used as a short-duration source of heated air to which the turbine is subjected and thin-film gages are used to obtain the heat-flux measurements. Results are presented along the blade in the flow direction at 10, 50, and 90 percent span for both the pressure and suction surfaces. A sufficient number of measurements were obtained to also present spanwise distributions. At approximately the 50 percent span location, two contoured inserts containing closely spaced gages were installed in the blade so that the leading-edge region distribution could be resolved in detail. The blade results are compared with predictions obtained using a flat-plate technique and with predictions obtained using a version of STAN 5.

  18. An experimental study of heat transfer in the rectangular coolant passages of a gas turbine rotor blade 

    E-Print Network [OSTI]

    Uddin, Mohammed Jalal

    2000-01-01

    Modern gas turbines have high inlet temperatures to harness maximum power output, which causes different components to experience severe thermal stresses and fatigue. To achieve turbine blade durability goals, the blades are cooled with air...

  19. REAL-TIME ROTOR BAR CURRENT MEASUREMENTS USING BLUETOOTH TECHNOLOGY FOR A BRUSHLESS DOUBLY-FED MACHINE (BDFM)

    E-Print Network [OSTI]

    Cambridge, University of

    's stator windings is connected to the fixed frequency mains or grid and other stator winding is supplied mover speed is variable, such as in wind turbines. For variable speed operation one of the machine of avoiding the problems associated with brush gear, making the BDFM particularly attractive for offshore wind

  20. Flow Sensing for Height Estimation and Control of a Rotor in Ground Effect: Modeling and Experimental Results

    E-Print Network [OSTI]

    Shapiro, Benjamin

    are presented and the effect of motor dynamics on the overall dynamics are investigated. Flowfield velocity the helicopter aerodynamics onboard and modulates the motor torque, rather than the collective pitch, during take- niques often require a system model with empirically fit aero- dynamic coefficients that are unique

  1. Optimization of a Savonius rotor vertical-axis wind turbine for use in water pumping systems in rural Honduras

    E-Print Network [OSTI]

    Zingman, Aron (Aron Olesen)

    2007-01-01

    The D-lab Honduras team designed and constructed a wind-powered water pump in rural Honduras during IAP 2007. Currently, the system does not work under its own power and water must be pumped by hand. This thesis seeks to ...

  2. Electrostatic generator/motor having rotors of varying thickness and a central stator electrically connected together into two groups

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    2010-11-16

    A sub-module consists of a set of two outer sets of stationary fan-blade-shaped sectors. These outer sectors include conductive material and are maintained at ground potential in several examples. Located midway between them is a set of stationary sector plates with each plate being electrically insulated from the others. An example provides that the inner sector plates are connected together alternately, forming two groups of parallel-connected condensers that are then separately connected, through high charging circuit resistances, to a source of DC potential with respect to ground, with an additional connecting lead being provided for each group to connect their output as an AC output to a load. These same leads can he used, when connected to a driver circuit, to produce motor action.

  3. Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing 

    E-Print Network [OSTI]

    Wilkes, Jason Christopher

    2012-02-14

    applied to the shaft resulted in a shaft displacement of 25 microns (1 mil), the pad would displace radially 15 microns (0.6 mils), and the fluid film height would only decrease by 10 microns (0.4 mils). The consequence of this pad motion is that fluid...

  4. Naturally occurring, optically driven, cellular rotor J. A. Dharmadhikari, S. Roy, A. K. Dharmadhikari, S. Sharma, and D. Mathura)

    E-Print Network [OSTI]

    Sharma, Shobhona

    005, India (Received 10 June 2004; accepted 20 October 2004) We report the conversion of optical energy into mechanical energy by naturally occurring red blood cells (RBCs) placed in an optical trap material, biconcave disk-shaped red blood cells (RBCs), which convert optical energy into mechanical energy

  5. A simple rotor current observer with an arbitrary rate of convergence for the Brushless Doubly-Fed

    E-Print Network [OSTI]

    Cambridge, University of

    drive (VSD), and as a generator where the prime mover speed can be variable, such as in a wind turbine of brushless operation are maintained. This is of particular interest for off-shore wind turbine applications will be limited by model accuracy and the level of sensor noise. The observer exploits the form of the BDFM

  6. Rotational Augmentation on a 2.3 MW Rotor Blade with Thick Flatback Airfoil Cross-Sections: Preprint

    SciTech Connect (OSTI)

    Schreck, S.; Fingersh, L.; Siegel, K.; Singh, M.; Medina, P.

    2013-01-01

    Rotational augmentation was analyzed for a 2.3 MW wind turbine, which was equipped with thick flatback airfoils at inboard radial locations and extensively instrumented for acquisition of time varying surface pressures. Mean aerodynamic force and surface pressure data were extracted from an extensive field test database, subject to stringent criteria for wind inflow and turbine operating conditions. Analyses of these data showed pronounced amplification of aerodynamic forces and significant enhancements to surface pressures in response to rotational influences, relative to two-dimensional, stationary conditions. Rotational augmentation occurrence and intensity in the current effort was found to be consistent with that observed in previous research. Notably, elevated airfoil thickness and flatback design did not impede rotational augmentation.

  7. Mach number correlation for a two-dimensional helicopter rotor-blade analysis in the tip region 

    E-Print Network [OSTI]

    Schillings, John Joseph

    1983-01-01

    -'7. The value of corrected Mach number (Hc) is defined as Mc =M+5M The delta Mach number required is shown as a function of blade 31 Table 4 Summary of Parameters for Flight Condition Azimuth MTTP r/R Mc Cn 90 . 846 . 750 . 682 . 846 . 757 . 910 . 787... . 955 . 8'16 . 970 . 826 . 990 . 839 . 0 . 0 -. 020 -. 040 -. 050 ? . 110 . 682 . 321 . 757 . 195 , 767 . 155 . 776 . 166 . 776 . 099 . 729 ~ 077 Table 5 Summary of Parameters for Flight Condition Azimuth MTip r/R Mc Cn 30 60 90 120...

  8. Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo Alto, California 94304 SW 41 Ti ROTOR

    E-Print Network [OSTI]

    Marchant, Jonathan

    Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo if used in a centrifuge not of Beckman Coulter's manufacture or in a Beckman Coulter ultra- centrifuge or explosive vapors. Do not centrifuge such materials in nor handle or store them near the ultracentrifuge

  9. VOL. 11, NO. 9, SEPTEMBER 1974 J. SPACECRAFT 611 Effects of Asymmetries in the Rotor and Flexible Joint

    E-Print Network [OSTI]

    . The equations ofmotion are linear gyroscopic equations withperiodic coefficients contributed by the inequalityin

  10. TITLE: The Influence of Carrier Bearing Tolerances on Planet Gear and Bearing Alignment under Side Load and Rotor Weight

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With LivermoreSustainableDEPARTMENT OF ENERGYFAQS TITLETITLE XVIIst11

  11. Analysis of flexure pivot tilting pad gas bearings with different damper configurations 

    E-Print Network [OSTI]

    Rimpel, Aaron Michael

    2009-05-15

    . shim thickness D Journal/rotor diameter ( 2D R= ) ,X Ye etildenosp tildenosp Eccentricities of rotor within bearing; absolute rotor displacement minus bearing shell displacement E Young?s modulus f Linear frequency, i.e. cycles per second...) or time constant of exponential rotor-speed decrement ? Rotor spin speed or rotational frequency (i.e. 2 f? pi= ) x ? Excitation frequency, i.e. rotor precession frequency ? Phase lag angle of response { }K? Eigenvector for rotor...

  12. Iowa State University Digital Repository @ Iowa State University

    E-Print Network [OSTI]

    McCalley, James D.

    of a rotor [36]. According to the momentum source approach, which was first applied to vertical axis wind turbines, the function of a rotating rotor is to impart momentum to the flow. The rotor is, thus, replaced

  13. Deterministic Magnetization Control by Magnetoelastic Anisotropy and its Dependence on Geometry and Scale

    E-Print Network [OSTI]

    Hockel, Joshua Leon

    2013-01-01

    of magnetic rotor/flagellum assemblies for propulsion asmagnetic rotor showing external flux lines (Left). Nanomotor with flexible flagella attachments for propulsion. magnetic rotor showing external flux lines (Left). Nanomotor with flexible flagella attachments for propulsion

  14. Suppression of probe background signals via B1 field inhomogeneity

    E-Print Network [OSTI]

    Feng, Jian

    2011-01-01

    the rest of the paper. Zirconia rotor and Torlon spinningin combination with Zirconia rotor and Kel-F spinning tips,5 mm (o.d. , 200 ?L) Doty Zirconia rotor and stuffed it with

  15. Synthesis, Postmodification, Metalation, and Gas Adsorption in Chemically Stable Metal Organic Frameworks and Zeolitic Imidazolate Frameworks.

    E-Print Network [OSTI]

    Morris, William

    2012-01-01

    4 mm (outside diameter) zirconia rotors. The magic angle was4 mm (outside diameter) zirconia rotors. The magic angle was4 mm (outside diameter) zirconia rotors. The magic angle was

  16. Wind energy conversion system

    DOE Patents [OSTI]

    Longrigg, Paul (Golden, CO)

    1987-01-01

    The wind energy conversion system includes a wind machine having a propeller connected to a generator of electric power, the propeller rotating the generator in response to force of an incident wind. The generator converts the power of the wind to electric power for use by an electric load. Circuitry for varying the duty factor of the generator output power is connected between the generator and the load to thereby alter a loading of the generator and the propeller by the electric load. Wind speed is sensed electro-optically to provide data of wind speed upwind of the propeller, to thereby permit tip speed ratio circuitry to operate the power control circuitry and thereby optimize the tip speed ratio by varying the loading of the propeller. Accordingly, the efficiency of the wind energy conversion system is maximized.

  17. 1 J. Gen. Physiol. The Rockefeller University Press 0022-1295 Volume 117 April 2001

    E-Print Network [OSTI]

    Grabe, Michael

    and stator are such that two rotor sites cannot fit in the rotor­stator interface at once. #12;2 Grane

  18. Sandia Energy - EC Publications

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

    added September 29, 2014 Downloaded 39 times Category Large Offshore Rotor Development, Offshore Wind, Rotor Innovation, Wind Energy Tags sand2014-18129 SNL100-03 Flatback...

  19. Sandia Energy - EC Publications

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

    added September 29, 2014 Downloaded 68 times Category Large Offshore Rotor Development, Offshore Wind, Rotor Innovation, Wind Energy All Models (13.2MW Turbine Model + all 4...

  20. Wind turbine having a direct-drive drivetrain

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2011-02-22

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  1. Wind turbine/generator set and method of making same

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2013-06-04

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  2. Wind turbine/generator set having a stator cooling system located between stator frame and active coils

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2012-11-13

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  3. Internal combustion rotary engine

    SciTech Connect (OSTI)

    Chen, S.P.

    1993-08-24

    An internal combustion rotary engine is described comprising: an internal combustion chamber wherein a combustible fuel-air mixture is ignited for producing a driving gas flow; a central rotor having an outer surface in which at least one group of curved channels circumferentially-and-axially extending without radially extending through the central rotor; and at least one annular rotor each enclosing the central rotor having an inner surface in which a corresponding number of curved channels circumferentially-and-axially extending without radially extending through the annular rotor; when the curved channels in the central rotor communicate with the curved channels in the annular rotor, the driving gas flow circumferentially-and-axially passing between the outer surface of the central rotor and the inner surface of the annular rotor for rotating the central rotor and the annular rotor in opposite directions.

  4. Effective theory for the non-rigid rotor in an electromagnetic field: Toward accurate and precise calculations of E2 transitions in deformed nuclei

    E-Print Network [OSTI]

    E. A. Coello Pérez; T. Papenbrock

    2015-07-16

    We present a model-independent approach to electric quadrupole transitions of deformed nuclei. Based on an effective theory for axially symmetric systems, the leading interactions with electromagnetic fields enter as minimal couplings to gauge potentials, while subleading corrections employ gauge-invariant non-minimal couplings. This approach yields transition operators that are consistent with the Hamiltonian, and the power counting of the effective theory provides us with theoretical uncertainty estimates. We successfully test the effective theory in homonuclear molecules that exhibit a large separation of scales. For ground-state band transitions of rotational nuclei, the effective theory describes data well within theoretical uncertainties at leading order. In order to probe the theory at subleading order, data with higher precision would be valuable. For transitional nuclei, next-to-leading order calculations and the high-precision data are consistent within the theoretical uncertainty estimates. We also study the faint inter-band transitions within the effective theory and focus on the $E2$ transitions from the $0^+_2$ band (the "$\\beta$ band") to the ground-state band. Here, the predictions from the effective theory are consistent with data for several nuclei, thereby proposing a solution to a long-standing challenge.

  5. Photochemistry and Photophysics of Highly Ordered Materials in the Solid State: Synthesis and Dynamics of Molecular Rotors, Photodegradation of Bird Feathers, Studies of Photodecarbonylation by Transient Absorption Spectroscopy

    E-Print Network [OSTI]

    Hughs, Melissa Lynn

    2015-01-01

    bis(triphenylphosphine)palladium dichloride (185 mg, 0.264bis(triphenylphosphine)palladium dichloride (121 mg, 0.17bis( triphenylphospnene) palladium dichloride (23.4 mg,

  6. Effective theory for the non-rigid rotor in an electromagnetic field: Toward accurate and precise calculations of E2 transitions in deformed nuclei

    E-Print Network [OSTI]

    Pérez, E A Coello

    2015-01-01

    We present a model-independent approach to electric quadrupole transitions of deformed nuclei. Based on an effective theory for axially symmetric systems, the leading interactions with electromagnetic fields enter as minimal couplings to gauge potentials, while subleading corrections employ gauge-invariant non-minimal couplings. This approach yields transition operators that are consistent with the Hamiltonian, and the power counting of the effective theory provides us with theoretical uncertainty estimates. We successfully test the effective theory in homonuclear molecules that exhibit a large separation of scales. For ground-state band transitions of rotational nuclei, the effective theory describes data well within theoretical uncertainties at leading order. In order to probe the theory at subleading order, data with higher precision would be valuable. For transitional nuclei, next-to-leading order calculations and the high-precision data are consistent within the theoretical uncertainty estimates. We also...

  7. To cite this document: Barbiero, Franck and Vincent, Franois and Deloues, Thierry and Letestu, Franck Effects of rotor blade modulation on GNSS anti-jamming algorithms.

    E-Print Network [OSTI]

    Mailhes, Corinne

    in the development of radiofrequency front-end for GPS and GLONASS receivers in Brime SUD, he joined THALES in 2001 currently as design authority for the development of controlled radiated pattern antenna products. ABSTRACT

  8. 21`eme Congr`es Francais de Mecanique Bordeaux, 26 au 30 ao^ut 2013 Etude aerodynamique instationnaire d'un rotor eolien de

    E-Print Network [OSTI]

    Boyer, Edmond

    the Savonius wind turbine operation, especially by comparing static results (motionless wind turbine) and dynamic results (wind turbine in rotation). This study provides a new vision of its behavior. Indeed shows that the maximum torque is obtained when the axis of the blade is parallel to the wind, so

  9. Design of a four rotor unmanned aerial vehicle capable of sustaining zero-roll and zero-pitch flight using vector thrusting

    E-Print Network [OSTI]

    Hilton, Danny Charles

    2005-01-01

    In recent decades, remote controlled airplanes and helicopters equipped with video cameras have been used by the movie industry, photographers, and for surveillance. The military deploys these unmanned aerial vehicles ...

  10. Test versus predictions for rotordynamic and leakage characteristics of a convergent-tapered, honeycomb-stator/smooth-rotor annular gas seal 

    E-Print Network [OSTI]

    Van Der Velde Alvarez, Daniel Eduardo

    2009-05-15

    This thesis presents the results for measured and predicted rotordynamic coefficients and leakage for a convergent-tapered honeycomb seal (CTHC). The test seals had a diameter of 114.968 mm (4.5263 in) at the entrance, and ...

  11. Aerodynamic Sensitivity Analysis of Rotor Imbalance and Shear Web Disbond Detection Strategies for Offshore Structural Health Prognostics Management of Wind Turbine Blades

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 OutreachProductswsicloudwsiclouddenDVA N C E D B L O O D S TA I N P A T T E R N A NA LY S I SCommitteesSensitivity

  12. Modal Dynamics and Stability of Large Multi-megawatt Deepwater Offshore Vertical-axis Wind Turbines: Initial Support Structure and Rotor Design Impact Studies

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on77 PAGEMission Mission Missionof EnergyJennings= a n

  13. CURRICULUM VITAE ping.hsu@sjsu.edu

    E-Print Network [OSTI]

    Su, Xiao

    with an EAI 640 minicomputer. INDUSTRY PROJECTS: Kenetech Windpower Developed a real-time rotor resistance

  14. Passive magnetic bearing configurations

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    2011-01-25

    A journal bearing provides vertical and radial stability to a rotor of a passive magnetic bearing system when the rotor is not rotating and when it is rotating. In the passive magnetic bearing system, the rotor has a vertical axis of rotation. Without the journal bearing, the rotor is vertically and radially unstable when stationary, and is vertically stable and radially unstable when rotating.

  15. A Fixed-Based Flight Simulator Study: The Interdependence of Flight Control

    E-Print Network [OSTI]

    , rotorcraft accel- eration is achieved by tilting the rotor disc (and thus, the helicopter) forward. Lateral

  16. PROOF COPY 004104JTM Christopher McLean1

    E-Print Network [OSTI]

    Camci, Cengiz

    aerodynamic effects associated with rotor­nozzle guide vane (NGV) gap coolant injections were investigated

  17. Observations of Currents in Saginaw Bay, Lake Huron Michael J. McCormick and David J. Schwab

    E-Print Network [OSTI]

    equipped with a savonius rotor, compass vane and a thermistor. The VACM recorded speed, direction (+/- 3

  18. NOAA Technical Memorandum ERL PMEL-11 CONVERSION FROM FILM TO MAGNETIC CASSETTE RECORDING

    E-Print Network [OSTI]

    for current speed (savonius rotor), meter azimuth, current direction, and meter tilt. The modifications

  19. Modular Permanent Magnet Machine Based on Soft Magnetic *** Burgess-Norton Mfg.Co.

    E-Print Network [OSTI]

    Lipo, Thomas

    . The rotor structure can be designed with surface permanent magnet (SPM) or internal permanent magnet (IPM

  20. Method and system for controlling a permanent magnet machine

    DOE Patents [OSTI]

    Walters, James E.

    2003-05-20

    Method and system for controlling the start of a permanent magnet machine are provided. The method allows to assign a parameter value indicative of an estimated initial rotor position of the machine. The method further allows to energize the machine with a level of current being sufficiently high to start rotor motion in a desired direction in the event the initial rotor position estimate is sufficiently close to the actual rotor position of the machine. A sensing action allows to sense whether any incremental changes in rotor position occur in response to the energizing action. In the event no changes in rotor position are sensed, the method allows to incrementally adjust the estimated rotor position by a first set of angular values until changes in rotor position are sensed. In the event changes in rotor position are sensed, the method allows to provide a rotor alignment signal as rotor motion continues. The alignment signal allows to align the estimated rotor position relative to the actual rotor position. This alignment action allows for operating the machine over a wide speed range.

  1. 44th AIAA Aerospace Sciences Meeting and Exhibit, January 912, 2006 Reno, Nevada Application of the Time Spectral Method to Periodic

    E-Print Network [OSTI]

    Jameson, Antony

    of the body. Practical examples of this type include helicopter rotor blades in forward flight, rotor and efficient computation of periodic unsteady flows. The algorithm has been validated with both 2D and 3D test

  2. Impact of unsteady flow processes on the performance of a high speed axial flow compressor

    E-Print Network [OSTI]

    Botros, Barbara Brenda

    2008-01-01

    This thesis examines the unsteady interactions between blade rows in a high Mach number, highly-loaded compressor stage. Two straight vane/rotor configurations with different axial spacing between vane and rotor are ...

  3. Performance analysis of synchronous machines under dynamic eccentricity 

    E-Print Network [OSTI]

    Al-Nuaim, Nabil Abdulaziz

    1996-01-01

    The performance of salient pole synchronous machines under eccentric rotors is studied. Relationships between stator and rotor current induced harmonics and dynamic eccentricity are investigated. The winding function theory has been modified...

  4. How Does a Wind Turbine Work?

    Office of Energy Efficiency and Renewable Energy (EERE)

    Wind turbines operate on a simple principle. The energy in the wind turns two or three propeller-like blades around a rotor. The rotor is connected to the main shaft, which spins a generator to...

  5. joule08tit.ai

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

    that these inclusions often do NOT degrade, even after many decades of service. C-Mod's generator rotor C-Mod's generator rotor We have learned that our situation is not at all...

  6. Effect of shrink fits on threshold speeds of rotordynamic instability 

    E-Print Network [OSTI]

    Al-Baz, Khalid A

    2001-01-01

    The purpose of this thesis is to study the effect of shrink fits on the threshold speeds of rotor instability. Shrink or press fit components in built-up rotors are known sources of internal friction damping. The internal ...

  7. Sandia Energy - EC Publications

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

    added September 29, 2014 Downloaded 65 times Category Large Offshore Rotor Development, Offshore Wind, Rotor Innovation, Wind Energy Tags sand2011-3779 SNL100-00 All-glass...

  8. Sandia Energy - EC Publications

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

    added September 29, 2014 Downloaded 33 times Category Large Offshore Rotor Development, Offshore Wind, Rotor Innovation, Wind Energy Tags sand2013-10162 SNL100-02 Advanced Core...

  9. Sandia Energy - EC Publications

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

    added September 29, 2014 Downloaded 44 times Category Large Offshore Rotor Development, Offshore Wind, Rotor Innovation, Wind Energy Tags sand2011-9310p SNL13.2MW-00-Land FAST...

  10. Low-cost motor drive embedded fault diagnosis systems 

    E-Print Network [OSTI]

    Akin, Bilal

    2009-05-15

    ]. When an asymmetry is introduced in the rotor structure, the backward rotating negative sequence ?sf e components start the chain electrical and mechanical interactions between rotor and stator of the motor. Initially, stator EMF at frequency (1-2s...

  11. Rotary-reciprocal combustion engines

    SciTech Connect (OSTI)

    Blount, D.H.

    1992-10-06

    This patent describes an internal combustion engine of the rotary-reciprocal type. It comprises a housing formed with a peripheral wall; a rotor; and a shaft for the rotor.

  12. Energies 2009, 2, 307-319; doi:10.3390/en20200307 ISSN 1996-1073

    E-Print Network [OSTI]

    Firestone, Jeremy

    to the surface with a tether. In the design proposed by Sky Windpower (Figure 1b), four rotors are mounted

  13. Methods and apparatus for twist bend coupled (TCB) wind turbine blades

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw; LeMieux, David Lawrence; Pierce, Kirk Gee

    2006-10-10

    A method for controlling a wind turbine having twist bend coupled rotor blades on a rotor mechanically coupled to a generator includes determining a speed of a rotor blade tip of the wind turbine, measuring a current twist distribution and current blade loading, and adjusting a torque of a generator to change the speed of the rotor blade tip to thereby increase an energy capture power coefficient of the wind turbine.

  14. Adapting a Beam-Based Rotordynamics Model to Accept a General Three-Dimensional Finite-Element Casing Model 

    E-Print Network [OSTI]

    James, Stephen M.

    2011-08-08

    ? Matrix of eigenvectors of rotor [ ]rA ? Component mode synthesis transformation matrix for rotor [ ]XA ? Eigenvector matrix for X Z? plane [ ]YA ? Eigenvector matrix for Y Z? plane , , , b1 b2 b3 b4 ? Bearings used in component... [F] FEA ? Finite element analysis FEM ? Finite element methods ; 1:if i = m ? ith force matrix element in Guyan reduction [F] { }rBF ? Transformed rotor external forces matrix ; 1:rif i m= ? Force acting at the ith station of rotor...

  15. ,,Als nach dem Krieg unsere Wirtschaft in schwerster Weise unter der allgemeinen

    E-Print Network [OSTI]

    Windrad die gesamte Energie aus dem Wind zu gewinnen, dann hätte die Luft hinter dem Rotor die Geschwindig

  16. Experiments to model the rotordynamic behavior of rub rings and bumpers 

    E-Print Network [OSTI]

    Aguilar-Armendariz, Eduardo

    2000-01-01

    installation for the single-wheel rotor configuration 5 Fabrication drawing of the housing. . 6 Metal mesh/rub ring assembly 7 Instrumentation ? load cells location. 12 8 Instrumentation ? proximity transducers. . 13 9 Basehne, no imbalance mass added... located close to the middle span of the rotor, . . . . . . . . . 25 13 Test 5, proximity sensor located close to the mid span of the rotor. . . . . . . . . . . . . . 26 14 Test 6, proximity sensor located close to the mid span of the rotor...

  17. Water injected fuel cell system compressor

    DOE Patents [OSTI]

    Siepierski, James S. (Williamsville, NY); Moore, Barbara S. (Victor, NY); Hoch, Martin Monroe (Webster, NY)

    2001-01-01

    A fuel cell system including a dry compressor for pressurizing air supplied to the cathode side of the fuel cell. An injector sprays a controlled amount of water on to the compressor's rotor(s) to improve the energy efficiency of the compressor. The amount of water sprayed out the rotor(s) is controlled relative to the mass flow rate of air inputted to the compressor.

  18. U.S. DEPARTMENT OF COMMERCE Peter G. Peterson, Secretary

    E-Print Network [OSTI]

    of switch closures produced by 16 small magnets mounted on the Savonius rotor. The next measurement occurred

  19. "Title","Creator/Author","Publication Date","OSTI Identifier...

    Office of Scientific and Technical Information (OSTI)

    National Labs., Albuquerque, NM (USA)","USDOE","17 WIND ENERGY; DARRIEUS ROTORS; TURBINE BLADES; AERODYNAMICS; AIRFOILS; COMPARATIVE EVALUATIONS; DATA COMPILATION;...

  20. Making Caveolae by the Alkaline Detergent-Free Procedure (modified from Song et al. (1996) J. Biol. Chem. 271:9690-9697)

    E-Print Network [OSTI]

    Pike, Linda J.

    1996-01-01

    ,000 rpm) in a SW41 swinging bucket rotor. Centrifugation should be carried out at 4° C. 6. Remove tubes

  1. National Aeronautics and Space Administration www.nasa.gov

    E-Print Network [OSTI]

    metals in helicopter fuselages and rotor blades, and have become critical for reducing the weight engine, or the complex interactions between a rotorcraft's main rotor blades, fuselage and its tail rotor and the development of new aircraft. CFD greatly reduces the time and cost required for designing and testing nearly

  2. American Institute of Aeronautics and Astronautics An Experimental Investigation on the Wake Characteristics behind

    E-Print Network [OSTI]

    Hu, Hui

    Characteristics behind a Novel Twin-Rotor Wind Turbine Zhenyu Wang1 , Ahmet Ozbay2 , Wei Tian3 , Anupam Sharma4 of an innovative twin-rotor wind turbine (TRWT) in comparison with those of a conventional single-rotor wind turbine (SRWT). The comparative study was conducted in a large-scale Aerodynamic/Atmospheric Boundary

  3. Gear coupling effects on rotordynamics 

    E-Print Network [OSTI]

    Clark, Robert Warren

    1988-01-01

    The forces on the rotor gear shown in Figure 5, will be equal but opposite those on the spacer. Therefore the forces on a tooth of the rotor located at 8, in spacer reference frame are: sp ace r FN rotor Ey Z. torque Y. Y, f Fig. 5. Forces on one...

  4. Scientific Bulletin of the "Politehnica" University of Timisoara

    E-Print Network [OSTI]

    Müller, Norbert

    , 2005 WAVE ROTORS TECHNOLOGY AND APPLICATIONS ABSTRACT This paper presents an overview of Wave Rotor technology and its most known applications, The Wave Rotors also known as Pressure Wave Machines or Pressure Exchangers, are unsteady-flow devices that can transfer energy directly between two fluids, by means

  5. 1 Copyright 2004 by ASME Proceedings of IMECE04

    E-Print Network [OSTI]

    Müller, Norbert

    : mueller@egr.msu.edu ABSTRACT Wave rotor technology has shown a significant potential for performance of the low energy fluid. While several different configurations of mainly axial-flow wave rotors have been Congress November 13­19, 2004, Anaheim, California USA IMECE2004-59022 RADIAL-FLOW WAVE ROTOR CONCEPTS

  6. 1 Copyright 2004 by ASME Proceedings of IMECE04

    E-Print Network [OSTI]

    Müller, Norbert

    - FLOW PROCESSES IN WAVE ROTORS M. Frackowiak Warsaw University of Technology Institute of Aeronautics INTRODUCTION Wave rotor technology has shown significant potential for increasing efficiency and performance of thermodynamic systems. The wave rotor is an unsteady-flow device that utilizes shock waves to exchange energy

  7. 1 Copyright 2004 by ASME Proceedings of IMECE04

    E-Print Network [OSTI]

    Müller, Norbert

    Congress November 13­19, 2004, Anaheim, California USA IMECE2004-60082 A REVIEW OF WAVE ROTOR TECHNOLOGY of this paper is to provide a succinct review of past and current research in developing wave rotor technology, and other design and analysis tools are presented. Keywords: wave rotor, dynamic pressure exchanger, energy

  8. High temperature turbine engine structure

    DOE Patents [OSTI]

    Boyd, Gary L. (Tempe, AZ)

    1991-01-01

    A high temperature turbine engine includes a rotor portion having axially stacked adjacent ceramic rotor parts. A ceramic/ceramic joint structure transmits torque between the rotor parts while maintaining coaxial alignment and axially spaced mutually parallel relation thereof despite thermal and centrifugal cycling.

  9. Electrical machines and assemblies including a yokeless stator with modular lamination stacks

    DOE Patents [OSTI]

    Qu, Ronghai; Jansen, Patrick Lee; Bagepalli, Bharat Sampathkumar; Carl, Jr., Ralph James; Gadre, Aniruddha Dattatraya; Lopez, Fulton Jose

    2010-04-06

    An electrical machine includes a rotor with an inner rotor portion and an outer rotor portion, and a double-sided yokeless stator. The yokeless stator includes modular lamination stacks and is configured for radial magnetic flux flow. The double-sided yokeless stator is concentrically disposed between the inner rotor portion and the outer rotor portion of the electrical machine. Examples of particularly useful embodiments for the electrical machine include wind turbine generators, ship propulsion motors, switch reluctance machines and double-sided synchronous machines.

  10. Methods and apparatus for cooling wind turbine generators

    DOE Patents [OSTI]

    Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

    2008-10-28

    A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

  11. Velocity pump reaction turbine

    DOE Patents [OSTI]

    House, Palmer A. (Walnut Creek, CA)

    1984-01-01

    An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

  12. Velocity pump reaction turbine

    DOE Patents [OSTI]

    House, Palmer A. (Walnut Creek, CA)

    1982-01-01

    An expanding hydraulic/two-phase velocity pump reaction turbine including a dual concentric rotor configuration with an inter-rotor annular flow channel in which the inner rotor is mechanically driven by the outer rotor. In another embodiment, the inner rotor is immobilized and provided with gas recovery ports on its outer surface by means of which gas in solution may be recovered. This velocity pump reaction turbine configuration is capable of potential energy conversion efficiencies of up to 70%, and is particularly suited for geothermal applications.

  13. Method and system for controlling start of a permanent magnet machine

    DOE Patents [OSTI]

    Walters, James E.; Krefta, Ronald John

    2003-10-28

    Method and system for controlling a permanent magnet machine are provided. The method provides a sensor assembly for sensing rotor sector position relative to a plurality of angular sectors. The method further provides a sensor for sensing angular increments in rotor position. The method allows starting the machine in a brushless direct current mode of operation using a calculated initial rotor position based on an initial angular sector position information from the sensor assembly. Upon determining a transition from the initial angular sector to the next angular sector, the method allows switching to a sinusoidal mode of operation using rotor position based on rotor position information from the incremental sensor.

  14. Rotary engine

    SciTech Connect (OSTI)

    Leas, A. M.; Leas, L. E.

    1985-02-12

    Disclosed are an engine system suitable for use with methyl alcohol and hydrogen and a rotary engine particularly suited for use in the engine system. The rotary engine comprises a stator housing having a plurality of radially directed chamber dividers, a principal rotor, a plurality of subordinate rotors each having an involute gear in its periphery mounted on the principal rotor, and means for rotating the subordinate rotors so that their involute gears accept the radially directed dividers as the subordinate rotors move past them.

  15. Wind turbine having a direct-drive drivetrain

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2008-10-07

    A wind turbine (100) comprising an electrical generator (108) that includes a rotor assembly (112). A wind rotor (104) that includes a wind rotor hub (124) is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle (160) via a bearing assembly (180). The wind rotor hub includes an opening (244) having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity (380) inside the wind rotor hub. The spindle is attached to a turret (140) supported by a tower (136). Each of the spindle, turret and tower has an interior cavity (172, 176, 368) that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system (276) for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  16. Rotary engine

    SciTech Connect (OSTI)

    Meyman, U.

    1987-02-03

    A rotary engine is described comprising: two covers spaced from one another; rotors located between the covers and rotating and planetating in different phases; the rotors interengaging to form working chambers therebetween; means to supply fluid to the working chambers and means to exhaust fluid from the working chambers during the operating cycle of the engine; gearing for synchronizing rotation and planetation of the rotors and each including first and second gears arranged so that one of the gears is connected with the rotors while the other of the gears is connected with an immovable part of the engine and the gears engage with one another; carriers interconnecting the rotors and planetating in the same phase with the planetation of the rotors for synchronizing the rotation and planetation of the rotors; shafts arranged to support the carriers during their planetations; and elements for connecting the covers with one another.

  17. Hybrid-secondary uncluttered permanent magnet machine and method

    DOE Patents [OSTI]

    Hsu, John S.

    2005-12-20

    An electric machine (40) has a stator (43), a permanent magnet rotor (38) with permanent magnets (39) and a magnetic coupling uncluttered rotor (46) for inducing a slip energy current in secondary coils (47). A dc flux can be produced in the uncluttered rotor when the secondary coils are fed with dc currents. The magnetic coupling uncluttered rotor (46) has magnetic brushes (A, B, C, D) which couple flux in through the rotor (46) to the secondary coils (47c, 47d) without inducing a current in the rotor (46) and without coupling a stator rotational energy component to the secondary coils (47c, 47d). The machine can be operated as a motor or a generator in multi-phase or single-phase embodiments and is applicable to the hybrid electric vehicle. A method of providing a slip energy controller is also disclosed.

  18. Gas turbine sealing apparatus

    DOE Patents [OSTI]

    Wiebe, David J; Wessell, Brian J; Ebert, Todd; Beeck, Alexander; Liang, George; Marussich, Walter H

    2013-02-19

    A gas turbine includes forward and aft rows of rotatable blades, a row of stationary vanes between the forward and aft rows of rotatable blades, an annular intermediate disc, and a seal housing apparatus. The forward and aft rows of rotatable blades are coupled to respective first and second portions of a disc/rotor assembly. The annular intermediate disc is coupled to the disc/rotor assembly so as to be rotatable with the disc/rotor assembly during operation of the gas turbine. The annular intermediate disc includes a forward side coupled to the first portion of the disc/rotor assembly and an aft side coupled to the second portion of the disc/rotor assembly. The seal housing apparatus is coupled to the annular intermediate disc so as to be rotatable with the annular intermediate disc and the disc/rotor assembly during operation of the gas turbine.

  19. Method for providing slip energy control in permanent magnet electrical machines

    DOE Patents [OSTI]

    Hsu, John S.

    2006-11-14

    An electric machine (40) has a stator (43), a permanent magnet rotor (38) with permanent magnets (39) and a magnetic coupling uncluttered rotor (46) for inducing a slip energy current in secondary coils (47). A dc flux can be produced in the uncluttered rotor when the secondary coils are fed with dc currents. The magnetic coupling uncluttered rotor (46) has magnetic brushes (A, B, C, D) which couple flux in through the rotor (46) to the secondary coils (47c, 47d) without inducing a current in the rotor (46) and without coupling a stator rotational energy component to the secondary coils (47c, 47d). The machine can be operated as a motor or a generator in multi-phase or single-phase embodiments and is applicable to the hybrid electric vehicle. A method of providing a slip energy controller is also disclosed.

  20. Stirling cycle rotary engine

    SciTech Connect (OSTI)

    Chandler, J.A.

    1988-06-28

    A Stirling cycle rotary engine for producing mechanical energy from heat generated by a heat source external to the engine, the engine including: an engine housing having an interior toroidal cavity with a central housing axis for receiving a working gas, the engine housing further having a cool as inlet port, a compressed gas outlet port, a heated compressed gas inlet port, and a hot exhaust gas outlet port at least three rotors each fixedly mounted to a respective rotor shaft and independently rotatable within the toroidal cavity about the central axis; each of the rotors including a pair of rotor blocks spaced radially on diametrically opposing sides of the respective rotor shaft, each rotor block having a radially fixed curva-linear outer surface for sealed rotational engagement with the engine housing.

  1. Balanced pressure gerotor fuel pump

    DOE Patents [OSTI]

    Raney, Michael Raymond; Maier, Eugen

    2004-08-03

    A gerotor pump for pressurizing gasoline fuel is capable of developing pressures up to 2.0 MPa with good mechanical and volumetric efficiency and satisfying the durability requirements for an automotive fuel pump. The pump has been designed with optimized clearances and by including features that promote the formation of lubricating films of pressurized fuel. Features of the improved pump include the use of a shadow port in the side plate opposite the outlet port to promote balancing of high fuel pressures on the opposite sides of the rotors. Inner and outer rotors have predetermined side clearances with the clearances of the outer rotor being greater than those of the inner rotor in order to promote fuel pressure balance on the sides of the outer rotor. Support of the inner rotor and a drive shaft on a single bushing with bearing sleeves maintains concentricity. Additional features are disclosed.

  2. Method and apparatus for wind turbine braking

    DOE Patents [OSTI]

    Barbu, Corneliu (Laguna Hills, CA); Teichmann, Ralph (Nishkayuna, NY); Avagliano, Aaron (Houston, TX); Kammer, Leonardo Cesar (Niskayuna, NY); Pierce, Kirk Gee (Simpsonville, SC); Pesetsky, David Samuel (Greenville, SC); Gauchel, Peter (Muenster, DE)

    2009-02-10

    A method for braking a wind turbine including at least one rotor blade coupled to a rotor. The method includes selectively controlling an angle of pitch of the at least one rotor blade with respect to a wind direction based on a design parameter of a component of the wind turbine to facilitate reducing a force induced into the wind turbine component as a result of braking.

  3. Tip clearance flows in axial compressors: stall inception and stability enhancement

    E-Print Network [OSTI]

    Weichert, Stephanie April

    2012-02-07

    and 91 figures. Part of this dissertation has been presented in the following publication: Weichert, S., Day, I. & Freeman, C. (2011) Self-Regulating Casing Treat- ment for Axial Compressor Stability Enhancement. Proceedings of ASME Turbo Expo 2011, June... -span if unspecified W Rotor Relative Flow Velocity, mid-span if unspecified xii Superscripts and Subscripts 0 Stagnation condition 1 Rotor inlet conditions 2 Rotor exit, stator inlet conditions 3 Stator exit conditions a1 Deverson compressor bellmouth inlet d2...

  4. Trapped field internal dipole superconducting motor generator

    DOE Patents [OSTI]

    Hull, John R. (Downers Grove, IL)

    2001-01-01

    A motor generator including a high temperature superconductor rotor and an internally disposed coil assembly. The motor generator superconductor rotor is constructed of a plurality of superconductor elements magnetized to produce a dipole field. The coil assembly can be either a conventional conductor or a high temperature superconductor. The superconductor rotor elements include a magnetization direction and c-axis for the crystals of the elements and which is oriented along the magnetization direction.

  5. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

    1993-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  6. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

    1994-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  7. Extended cage adjustable speed electric motors and drive packages

    DOE Patents [OSTI]

    Hsu, John S. (Oak Ridge, TN)

    1999-01-01

    The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.

  8. Extended cage adjustable speed electric motors and drive packages

    DOE Patents [OSTI]

    Hsu, J.S.

    1999-03-23

    The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced. 12 figs.

  9. High temperature turbine engine structure

    DOE Patents [OSTI]

    Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

    1992-01-01

    A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

  10. MATERIALS AND MOLECULAR RESEARCH DIVISION. ANNUAL REPORT 1978

    E-Print Network [OSTI]

    Authors, Various

    2011-01-01

    6) rotor end stop screw, 7) turbine drive air hole, 8) aircover plate mounting screw, 11 turbine drive air inlet. (XBL

  11. Sandia Energy - Marine Hydrokinetics Technology: Reference Model...

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

    Offshore Wind High-Resolution Computational Algorithms for Simulating Offshore Wind Farms Innovative Offshore Vertical-Axis Wind Turbine Rotors Offshore Wind RD&D:...

  12. Construction Completed on Wind Plant Optimization R&D Facility...

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

    Sandia National Laboratories Develop National Rotor Testbed SWiFT Turbines Full Dynamic Characterization Opens Doors for Research in the Dynamics of Coupled Systems National...

  13. COMMUNICATIONS IN COMPUTATIONAL PHYSICS Vol. 2, No. 6, pp. 1095-1124

    E-Print Network [OSTI]

    Groth, Clinton P. T.

    control surfaces, helicopter rotor blades, compressor and turbine blades, stage separation in launch embedded boundaries. Numerical results for various test problems are pre- sented to verify the validity

  14. Wind tunnel performance data for the Darrieus wind turbine with...

    Office of Scientific and Technical Information (OSTI)

    N.Mex. (USA) Country of Publication: United States Language: English Subject: 17 WIND ENERGY; DARRIEUS ROTORS; PERFORMANCE TESTING; AIR; CONFIGURATION; DESIGN; FLOW RATE;...

  15. B

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

    The slanted rotor allows the turbine to self-start without any external devices. This passive-control system offers power generation without the noise, clutch- ing,...

  16. Microsoft PowerPoint - Vicksburg District Federal Power Projects...

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

    Federal Power Projects Vicksburg District Federal Power Projects Blakely Mountain Hydro DeGray Hydro DeGray Hydro Narrows Hydro Blakely Mountain Rewind Unit 1 ll Rotor...

  17. Sandia Energy - Senator Bingaman Tells Sandia Wind Turbine Blade...

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

    turbine design, blade and rotor testing, manufacturing and inspection, distributed wind technology, and water power. Bingaman said a diversity of U.S. energy sources at a...

  18. Sandia Energy - Innovative Offshore Vertical-Axis Wind Turbine...

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

    Innovative Offshore Vertical-Axis Wind Turbine Rotors Home Stationary Power Energy Conversion Efficiency Wind Energy Offshore Wind Innovative Offshore Vertical-Axis Wind Turbine...

  19. Energy Department Awards $1.8 Million to Develop Wind Turbine...

    Office of Environmental Management (EM)

    Advanced Manufacturing Initiative Improves Turbine Blade Productivity 2011 DOE Funded Offshore Wind Project Updates DOE and Sandia National Laboratories Develop National Rotor...

  20. Key Activities in Wind Energy | Department of Energy

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

    laboratories to develop aerodynamic, structural and electrical test centers for wind farms, wind turbines, rotor blades, and drivetrains Enable industry to meet performance...

  1. Slide 1

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

    modifications to rotor spider * Replace failed instrumentation * Replace exciter PLC's * Cooling Water Supply System * Procure alignment tooling Major Maintenance Update BUILDING...

  2. The Digital Euripides (Translating Medea Into a Media Rich World)

    E-Print Network [OSTI]

    Richter, Stephen Eugene

    2015-01-01

    scream with grief and shock. HEAR helicopter rotors outside.on screen: video clip of a helicopter lifting off into the

  3. A multi-scale approach to statistical and model-based structural health monitoring with application to embedded sensing for wind energy

    E-Print Network [OSTI]

    Taylor, Stuart Glynn

    2013-01-01

    rotor blade," Structural Health Monitoring, accepted 12-Novdeployed for structural health monitoring applications,"J. -R. Lee, "Structural health monitoring of research-scale

  4. Halbach array generator/motor having an automatically regulated output voltage and mechanical power output

    DOE Patents [OSTI]

    Post, Richard F.

    2005-02-22

    A motor/generator having its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along its axis of rotation. The rotor includes a Halbach array. The stator windings are switched or commutated to provide a DC motor/generator much the same as in a conventional DC motor/generator. The voltage and power are automatically regulated by using centrifugal force to change the diameter of the rotor, and thereby vary the radial gap in between the stator and the rotating Halbach array, as a function of the angular velocity of the rotor.

  5. Sandia Energy - EC Publications

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

    Dynamics and Stability of Large Multi-megawatt Deepwater Offshore Vertical-axis Wind Turbines: Initial Support Structure and Rotor Design Impact StudiesTara...

  6. Sandia Energy - NuMAD License and Disclaimer

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

    License and Disclaimer Home Stationary Power Energy Conversion Efficiency Wind Energy Rotor Innovation Numerical Manufacturing And Design Tool (NuMAD) NuMAD License and Disclaimer...

  7. S A N D I A M I S S I O N

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

    Simulation of a synthetic gust (inviscid Taylor Vortex) passing through a 3-bladed Vertical Axis Wind Turbine rotor. Contact: Matthew Barone mbarone@sandia.gov 14...

  8. Motor/generator

    DOE Patents [OSTI]

    Hickam, Christopher Dale (Glasford, IL)

    2008-05-13

    A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor/generator housing, a stator mounted to the motor/generator housing, a rotor mounted at least partially within the motor/generator housing and rotatable about a rotor rotation axis, and a transmission-shaft coupler drivingly coupled to the rotor. The transmission-shaft coupler may include a clamp, which may include a base attached to the rotor and a plurality of adjustable jaws.

  9. Passive magnetic bearing for a motor-generator

    DOE Patents [OSTI]

    Post, Richard F. (Walnut Creek, CA)

    2006-07-18

    Conductive lap windings are interleaved with conventional loops in the stator of a motor-generator. The rotor provides magnetic induction lines that, when rotated, cut across the lap windings and the loops. When the rotor is laterally displaced from its equilibrium axis of rotation, its magnetic lines of induction induce a current in the interleaved lap windings. The induced current interacts with the magnetic lines of induction of the rotor in accordance with Lenz's law to generate a radial force that returns the rotor to its equilibrium axis of rotation.

  10. Sandia Energy - EC Publications

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

    8, 2014 Downloaded 143 times Category Energy Security, Large Offshore Rotor Development, Offshore Wind, Renewable Energy, Wind Energy author Resor, B. R., Owens, B. C., Griffith,...

  11. Sandia Energy - EC Publications

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

    8, 2014 Downloaded 207 times Category Energy Security, Large Offshore Rotor Development, Offshore Wind, Renewable Energy, Wind Energy report-id SAND2013-2734 author Griffith, D....

  12. Sandia Energy - EC Publications

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

    8, 2014 Downloaded 238 times Category Energy Security, Large Offshore Rotor Development, Offshore Wind, Renewable Energy, Wind Energy report-id SAND2014-8129 author Griffith, D....

  13. Sandia Energy - EC Publications

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

    8, 2014 Downloaded 206 times Category Energy Security, Large Offshore Rotor Development, Offshore Wind, Renewable Energy, Wind Energy report-id SAND2013-2733 author Johanns, W.,...

  14. Sandia Energy - EC Publications

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

    8, 2014 Downloaded 241 times Category Energy Security, Large Offshore Rotor Development, Offshore Wind, Renewable Energy, Wind Energy report-id SAND2012-7669 author Griffith, D....

  15. Modeling and Control of an Active Magnetic Bearing Spindle System

    E-Print Network [OSTI]

    Cavalier, Grant

    2015-01-01

    Active Magnetic Bearing SpindleKang. “Control of an Active Magnetic Bearing-Rotor System. ”T.C. Tsao. “Control of Magnetic Bearings with Plug-in Time-

  16. TITLE AUTHORS SUBJECT SUBJECT RELATED DESCRIPTION PUBLISHER AVAILABILI...

    Office of Scientific and Technical Information (OSTI)

    of vertical axis wind turbines Sheldahl R E Klimas P C WIND ENERGY DARRIEUS ROTORS TURBINE BLADES AERODYNAMICS AIRFOILS COMPARATIVE EVALUATIONS DATA COMPILATION PERFORMANCE...

  17. Aerodynamic characteristics of seven symmetrical airfoil sections...

    Office of Scientific and Technical Information (OSTI)

    axis wind turbines Sheldahl, R E; Klimas, P C 17 WIND ENERGY; DARRIEUS ROTORS; TURBINE BLADES; AERODYNAMICS; AIRFOILS; COMPARATIVE EVALUATIONS; DATA COMPILATION;...

  18. Permanent-magnet-less synchronous reluctance system

    DOE Patents [OSTI]

    Hsu, John S

    2012-09-11

    A permanent magnet-less synchronous system includes a stator that generates a magnetic revolving field when sourced by an alternating current. An uncluttered rotor is disposed within the magnetic revolving field and spaced apart from the stator to form an air gap relative to an axis of rotation. The rotor includes a plurality of rotor pole stacks having an inner periphery biased by single polarity of a north-pole field and a south-pole field, respectively. The outer periphery of each of the rotor pole stacks are biased by an alternating polarity.

  19. Energy Department Accepting Small Business Grant Applications...

    Energy Savers [EERE]

    increasing the size of a wind turbine's rotor is accompanied by transportation, logistics, and manufacturing constraints that must be addressed to in order make these...

  20. Ahmet Ozbay Department of Aerospace Engineering,

    E-Print Network [OSTI]

    Hu, Hui

    onshore and offshore wind farms, almost all of them are SRWTs. The performance of a wind turbine@iastate.edu Experimental Investigation on the Wake Characteristics and Aeromechanics of Dual-Rotor Wind Turbines-rotor wind turbines (DRWTs) in either co-rotating or counter-rotating configuration, in comparison to those

  1. SCIENCE CHINA Physics, Mechanics & Astronomy

    E-Print Network [OSTI]

    Hu, Hui

    wind farms vs. ~7 rotor diameters for offshore wind farms in the prevailing wind direction), especially to turbines in onshore wind farms due to the smaller turbine spacing (i.e., ~3 rotor diameters for onshore. To achieve the goal of 20% of electricity generation from wind energy by 2030, while more and more wind farms

  2. Interior Duct Wall Pressure Downstream of a Low-Speed Scott C. Morris

    E-Print Network [OSTI]

    Alonso, Juan J.

    Interior Duct Wall Pressure Downstream of a Low-Speed Rotor Scott C. Morris , David B. Stephens The region downstream of a ducted rotor has been experimentally investigated in terms of its wake characteristics and the duct wall pressure fluctuations. The motivation for the measurements was to document

  3. Spin-stabilized magnetic levitation without vertical axis of rotation

    DOE Patents [OSTI]

    Romero, Louis (Albuquerque, NM); Christenson, Todd (Albuquerque, NM); Aaronson, Gene (Albuquerque, NM)

    2009-06-09

    The symmetry properties of a magnetic levitation arrangement are exploited to produce spin-stabilized magnetic levitation without aligning the rotational axis of the rotor with the direction of the force of gravity. The rotation of the rotor stabilizes perturbations directed parallel to the rotational axis.

  4. National Aeronautics and Space Administration www.nasa.gov

    E-Print Network [OSTI]

    aircraft 4 1 2 WIND TUNNEL TESTS H v F9DATA ACQUISITION SYSTEM8 TILT ROTOR PROOF OF CONCEPT10 PROPROTORS5 blades, fuselage and its tail rotor. Those ideas and codes became CFD, which today is considered a vital and cost required for designing and testing nearly any type of aircraft. NASA-developed computer software

  5. High-Resolution Simulations of Parallel BladeVortex Interactions

    E-Print Network [OSTI]

    Alonso, Juan J.

    to that encountered in the simulation of realistic helicopter blade­vortex interaction, but the computational costs aeroacoustics rotor tests [2,3]. These tests were performed on a Mach-scaled Bo-105 rotor and the blade loadsHigh-Resolution Simulations of Parallel Blade­Vortex Interactions Alasdair Thom University

  6. 7,511,624 -Aviation Overview: Device for monitoring the tracking, balance and integrity of helicopter and propeller

    E-Print Network [OSTI]

    Maxwell, Bruce D.

    of helicopter and propeller blades Researchers at Montana State University have developed a LIDAR (Light monitoring, used from the ground or as a carry-on instrument. [This technology was tested by sensing the wing of any helicopter or propeller driven aircraft.] Application · Rotor and propeller tracking ­ rotor wing

  7. National Aeronautics and Space Administration N A S A A E R O N A U T I C S R E S E A R C H O N B O A R D

    E-Print Network [OSTI]

    WIND TUNNEL TESTS H v F9DATA ACQUISITION SYSTEM8 TILT ROTOR PROOF OF CONCEPT10 PROPROTORS5 FLIGHT blades, fuselage and its tail rotor. Those ideas and codes became CFD, which today is considered a vital and cost required for designing and testing nearly any type of aircraft. NASA-developed computer software

  8. The Centre for Power Transmission

    E-Print Network [OSTI]

    Burton, Geoffrey R.

    Vibration Control for Rotorcraft Helicopters and other rotorcraft are subject to large vibrations, caused by the periodic variation of the airflow over the rotor blades and transmitted through the rotor hub pressure. (Dr D N Johnston). #12;6. Hybrid Testing of Multibody Systems Hybrid testing, also called model

  9. 45th AIAA Aerospace Sciences Meeting & Exhibit, 8-11 Jan, 2007, Reno, NV Euler Solutions of Flow around a Rectangular Wing

    E-Print Network [OSTI]

    Liu, Feng

    helicopter rotor blades and propeller blades interact with following blades causing rotor noise and vibration of the wing are computed by the Euler method and validated by a comprehensive wind-tunnel test data theories was given by Spalart.1 Wind-tunnel tests produce flow fields of good quality and accurate

  10. Ris-R-1261(EN) Fatigue Degradation and Failure of

    E-Print Network [OSTI]

    . Such applications are for instance rotor blades in wind turbines, helicopter rotor blades, flywheels for energy structures, improved test methods are necessary. Furthermore, the relation between structural, component and specimen test results should be better understood than what is presently the case. Improved predictive

  11. American Institute of Aeronautics and Astronautics AIAA Paper 2004-2431, Fluid Dynamics Meeting, Portland, OR, June 2004

    E-Print Network [OSTI]

    of uncertainty reduction. In ground effect (IGE) conditions, the wake of a helicopter rotor interacts with the ground and causes significant perturbation to the flow near the rotor blades, as well as the rest loads and moments have been reported from flight tests of new craft. Differences have also been observed

  12. National Aeronautics and Space Administration COMPOSITE STRUCTURES H v F

    E-Print Network [OSTI]

    replaced metals in helicopter fuselages and rotor blades, and have become critical for reducing the weight shuttle's main engine, or the complex interactions between a rotorcraft's main rotor blades, fuselage for designing and testing nearly any type of aircraft. 2. NASA Structural Analysis (NASTRAN) In the 1960s, NASA

  13. A Rigorous Framework for Optimization of Expensive Functions by Surrogates

    E-Print Network [OSTI]

    Torczon, Virginia

    of the objective. Numerical results are presented for a 31-variable helicopter rotor blade design example of x before f(x) can be evaluated. For example, in the helicopter rotor blade design problem, each x to some engineering design problems for which direct application of traditional optimization approaches

  14. Amir A. Kharazi e-mail: kharazia@egr.msu.edu

    E-Print Network [OSTI]

    Müller, Norbert

    .1115/1.1850503 Introduction The potential for using wave devices in thermodynamic cycles for power generation, propulsion- strated an attractive potential for reaching the ultrahigh perfor- mance targets of power systems-Port Condensing Wave Rotor Using a novel 3-port condensing wave rotor enhancing the turbocompression in a R718

  15. 1 Copyright 2004 by ASME Proceedings of IMECE 04

    E-Print Network [OSTI]

    Müller, Norbert

    Refrigerants, 3-port condensing wave rotor, water as a refrigerant, shock wave INTRODUCTION In 1974, scientists1 Copyright © 2004 by ASME Proceedings of IMECE 04 2004 ASME International Mechanical Engineering-COMPRESSION CYCLE USING 3-PORT CONDENSING WAVE ROTORS Amir A. Kharazi Michigan State University Dept. of Mechanical

  16. ISROMAC-11 Proceedings of the International Symposium on Transport Phenomena and Dynamics of Rotating Machinery,

    E-Print Network [OSTI]

    Camci, Cengiz

    for instantaneous and unsteady/turbulent flow events such as flows in wind turbine blades, jets, and rotor blades with the detailed aerodynamic flow near a rotating helicopter rotor blade. Three-component velocity measurements is analyzed with 3D PIV. Aerodynamic results obtained near the tip region, and specific issues related

  17. Proposed Contribution, 15th ASME Wind Energy Symposium, Houston, Texas, Jan. 28--Feb. 2, 1996

    E-Print Network [OSTI]

    Sweetman, Bert

    kW, operated by Northern Power Systems (Coleman and McNiff, 1989). It has a teetering hub design and Lange, 1995); and (3) a parallel LRFD study of a specific Danish wind turbine, also based on FORM with teetered rotor, with rotor diameter of 26m and power rating of 275kW (McCoy, 1995). This turbine is used

  18. Experimental study of quantum chaos with cold atoms Pascal Szriftgiser a,*, Hans Lignier a

    E-Print Network [OSTI]

    Delande, Dominique

    Experimental study of quantum chaos with cold atoms Pascal Szriftgiser a,*, Hans Lignier a , Jean-rotor; Dynamical localization; Quantum chaos; Cold atoms 1. Introduction The kicked rotor is a paradigmatic simple system for studies of classical and quantum chaos. Due to its simplicity­­a particle rotating

  19. Fuzzy logic control implementation in sensorless PM drive systems

    E-Print Network [OSTI]

    , Egypt Abstract The PM motor drive systems are becoming particularly popular in many industrial power switches are controlled directly from the rotor position sensor. An open-loop configuration is essential for controlling the power devices of the inverter. The main problem with present rotor position

  20. Permanent magnet design for high-speed superconducting bearings

    DOE Patents [OSTI]

    Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

    1996-09-10

    A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

  1. Estimation of Wind Speed in Connection to a Wind Turbine

    E-Print Network [OSTI]

    Estimation of Wind Speed in Connection to a Wind Turbine X. Ma #3; , N. K. Poulsen #3; , H. Bindner y December 20, 1995 Abstract The wind speed varies over the rotor plane of wind turbine making the wind speed on the rotor plane will be estimated by using a wind turbine as a wind measuring device

  2. Assessment of low-order theories for analysis and design of shrouded wind turbines using CFD

    E-Print Network [OSTI]

    Alonso, Juan J.

    Assessment of low-order theories for analysis and design of shrouded wind turbines using CFD Aniket of a shroud around the rotor of a wind turbine has been known to augment the airflow through the rotor plane the validity of several simple theories which attempt to extend Betz theory to shrouded turbines. Two CFD

  3. Elsevier Editorial System(tm) for Expert Systems With Applications Manuscript Draft

    E-Print Network [OSTI]

    Luger, George

    /prognostic software tool for the analysis of complex systems, such as monitoring the "running health" of helicopter successfully analyzed the data sets of actual helicopter rotor failures supplied to us by the US Navy components of helicopter rotor systems. We have been working for the past four years in the application

  4. In helicopters the tail mainly serves to keep the aircraft

    E-Print Network [OSTI]

    Langendoen, Koen

    In helicopters the tail mainly serves to keep the aircraft stable. The rotors are used to maneuver the helicopter. But a study at TU Delft revealed that involving the tail in commanding the helicopter not only reduces the structural load on the main rotor, but also makes the helicopter easier to handle

  5. Proceedings of ASME Turbo Expo 2012 June 11-15, 2012, Copenhagen, Denmark

    E-Print Network [OSTI]

    Camci, Cengiz

    and a 29 bladed HP turbine rotor. The NGV inlet and exit Reynolds numbers based on midspan axial chord. The computational predictions are compared to experimental data at NGV exit plane and rotor in- let plane. NGV exit with the experimental total pressure coefficient data at the NGV exit. The difference between the NGV only simulation

  6. The influence of internal friction on rotordynamic instability 

    E-Print Network [OSTI]

    Srinivasan, Anand

    2004-09-30

    Internal friction has been known to be a cause of whirl instability in built-up rotors since the early 1900's. This internal damping tends to make the rotor whirl at shaft speeds greater than a critical speed, the whirl speed usually being equal...

  7. Journal of Quality in Maintenance Engineering

    E-Print Network [OSTI]

    Ghouti, Lahouari

    demands on developing reliable vibration measuring systems. The main rotor-bearing vibration measurement the main shaft torsional vibration signals. Controlled experiments for forced blade vibration excitations, accelerometers are the most popular vibration pick-ups that collect signals containing all rotor-bearing

  8. Rotary magnetic heat pump

    DOE Patents [OSTI]

    Kirol, L.D.

    1987-02-11

    A rotary magnetic heat pump constructed without flow seals or segmented rotor accomplishes recuperation and regeneration by using split flow paths. Heat exchange fluid pumped through heat exchangers and returned to the heat pump splits into two flow components: one flowing counter to the rotor rotation and one flowing with the rotation. 5 figs.

  9. Rotary magnetic heat pump

    DOE Patents [OSTI]

    Kirol, Lance D. (Shelly, ID)

    1988-01-01

    A rotary magnetic heat pump constructed without flow seals or segmented rotor accomplishes recuperation and regeneration by using split flow paths. Heat exchange fluid pumped through heat exchangers and returned to the heat pump splits into two flow components: one flowing counter to the rotor rotation and one flowing with the rotation.

  10. IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 36, NO. 2, MARCH/APRIL 2000 531 High-Speed Synchronous Reluctance Machine with

    E-Print Network [OSTI]

    Sanders, Seth

    -speed high-power low-cost electric machine with low rotor losses in applications such as the motor TRANSACTIONS ON INDUSTRY APPLICATIONS by the Electric Machines Committee of the IEEE Industry Applications-Speed Synchronous Reluctance Machine with Minimized Rotor Losses Heath Hofmann, Member, IEEE, and Seth R. Sanders

  11. SANDIA REPORT SAND2013-2735

    E-Print Network [OSTI]

    Center for Systems Integrity 1500 Kepner Dr. Lafayette, IN 47905 D. Todd Griffith Wind Energy Technology Management for Offshore Wind Turbines: Case Studies of Rotor Fault and Blade Damage with Initial O&M Cost and Prognostics Management for Offshore Wind Turbines: Case Studies of Rotor Fault and Blade Damage with Initial O

  12. American Institute of Aeronautics and Astronautics An Experimental Investigation on the Aeromechanics and Near

    E-Print Network [OSTI]

    Hu, Hui

    Layer HAWT = Horizontal axis wind turbine SRWT = Single-rotor wind turbine DRWT(co) = Dual-rotor wind of the wind turbine model TKE = Turbulent kinetic energy Ruv = Reynolds shear stress in vertical. This necessitates the installation of wind turbines in large arrays (farms). Today, Horizontal Axis Wind Turbines

  13. SAND98-2823C ALAA 99-0047

    E-Print Network [OSTI]

    was acquired using accelerometers mounted on the rotor of a parked and undamaged horizontal-axis wind turbine is a photo of one of the three wind turbine blades on the rotor. This vertically orientated bladeSAND98-2823C ALAA 99-0047 Application of Damage Detection Techniques using Wind Turbine Modal Data

  14. Nonlinear Control of a Wind Turbine Sven Creutz Thomsen

    E-Print Network [OSTI]

    generated by generator Pr [W] - Mechanical power absorbed from the wind Rr [m] - Radius of rotors Tg [Nm to generator Tsr [Nm] - Generator torque transfered to rotor v [m/s] - Effective wind speed vf [mNonlinear Control of a Wind Turbine Sven Creutz Thomsen Kongens Lyngby 2006 #12;Technical

  15. Experimental verification of bifurcation in fluid bearings 

    E-Print Network [OSTI]

    Deepak, James Christopher

    1997-01-01

    The thesis presents the results of the experiments that were conducted on short and long fluid film bearings with a simple single disk rotor. The behavior of the journal was analyzed as function of the rotor system parameters such as the load, speed...

  16. Science Arts & Mtiers (SAM) is an open access repository that collects the work of Arts et Mtiers ParisTech

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    instationnaire d'un rotor éolien de Savonius : mise en évidence de l'influence de la portance - - 2013 Any´erodynamique instationnaire d'un rotor ´eolien de Savonius : mise en ´evidence de l'influence de la portance Pauline BUTAUDa'´eolienne Savonius, notamment en comparant les r´esultats statiques instationnaires (´eolienne immobile) et

  17. Safety Slides Rota/ng Sha3s AR-G2 Coue;e Fixture

    E-Print Network [OSTI]

    Cohen, Robert E.

    Safety Slides ­ Rota/ng Sha3s 1 AR-G2 Coue;e Fixture · loose-fi@ng shirts might possibly become entangled in rota/ng spindles or other kinds of moving working with heated rotors specific to our lab experiments Hea/ng inner rotor

  18. Post Doctoral Fellow M. R. Nalim

    E-Print Network [OSTI]

    Pekkan, Kerem

    nonsteady wave motion to ex- change energy by direct work action between chemically reacting or inert fluids, Purdue School of Engineering and Technology, Indiana University­Purdue University Indianapolis, 723 West Combustion Wave Rotor Configurations A wave rotor is proposed for use as a constant volume combustor. A novel

  19. C O N S E I L I N T E R N A T I O N A L I N T E R N A T I O N A L C O U N C I L DES MACHINES A COMBUSTION O N C O M B U S T I O N E N G I N E S

    E-Print Network [OSTI]

    Müller, Norbert

    energy is transferred directly to the air entering the combustion chamber. Thus, the wave rotor in a gas OF RECUPERATED AND UNRECUPERATED MICROTURBINES USING WAVE ROTOR MACHINES PAPER NO.: 218 Pezhman Akbari, Norbert and Technology, Indianapolis, IN, US A thermodynamic cycle analysis is performed to compare the performance

  20. Transient Lift-off Test Results for an Experimental Hybrid Bearing in Air 

    E-Print Network [OSTI]

    Klooster, David

    2011-02-22

    Inconel rotor attached via a high-speed coupling. The drive end is supported by ceramic ball bearings, while the hybrid bearing supports the opposite end. A magnetic bearing delivers the applied loading along the mid-span of the rotor. Many parameters...

  1. Apparatus and methods for cooling and sealing rotary helical screw compressors

    DOE Patents [OSTI]

    Fresco, Anthony N. (P.O. Box 734, Upton, NY 11973)

    1997-01-01

    In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor centerlines or alternatively the channel paths coincide with the helical path of the rotor edges.

  2. Apparatus and methods for cooling and sealing rotary helical screw compressors

    DOE Patents [OSTI]

    Fresco, A.N.

    1997-08-05

    In a compression system which incorporates a rotary helical screw compressor, and for any type of gas or refrigerant, the working liquid oil is atomized through nozzles suspended in, and parallel to, the suction gas flow, or alternatively the nozzles are mounted on the suction piping. In either case, the aim is to create positively a homogeneous mixture of oil droplets to maximize the effectiveness of the working liquid oil in improving the isothermal and volumetric efficiencies. The oil stream to be atomized may first be degassed at compressor discharge pressure by heating within a pressure vessel and recovering the energy added by using the outgoing oil stream to heat the incoming oil stream. The stripped gas is typically returned to the compressor discharge flow. In the preferred case, the compressor rotors both contain a hollow cavity through which working liquid oil is injected into channels along the edges of the rotors, thereby forming a continuous and positive seal between the rotor edges and the compressor casing. In the alternative method, working liquid oil is injected either in the same direction as the rotor rotation or counter to rotor rotation through channels in the compressor casing which are tangential to the rotor edges and parallel to the rotor center lines or alternatively the channel paths coincide with the helical path of the rotor edges. 14 figs.

  3. Classification: Biological Sciences / Biophysics Domain Compliance and Elastic Power Transmission

    E-Print Network [OSTI]

    Junge, Wolfgang

    in Rotary FOF1-ATPase Hendrik Sielaff1 , Henning Rennekamp1 , André Wächter1,2 , Hao Xie1 , Florian Hilbers1 of rotary ATP synthase, ionmotive FO and chemically active F1, are mechanically coupled by a central rotor. The compliance of certain domains was restricted by engineered disulfide bridges between rotor and stator

  4. High temperature turbine engine structure

    DOE Patents [OSTI]

    Boyd, Gary L. (Tempe, AZ)

    1990-01-01

    A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

  5. Zentrum f ur Technomathematik Fachbereich 3 --Mathematik und Informatik

    E-Print Network [OSTI]

    Bremen, Universität

    , turbine and coupling). The HP shaft is not accessible after the engine is assembled, which enforces distributions in an aircraft engine rotor with a nonlinear damping element. We have developed a rotor model that takes into account the non­ linear behavior of a squeeze film damper between the engine's shaft

  6. PROOF COPY 003104JTM Christopher McLean1

    E-Print Network [OSTI]

    Camci, Cengiz

    of these factors. A major concern in modern gas turbine engines is the cooling of turbine wheelspace turbine engines operate with mainstream gas temperatures exceed- ing 1450°C in the high-pressure turbine life. In a gas turbine engine, the spinning rotor disk induces periodic outward flow on the rotor side

  7. Detergent-Free Caveolae Prep (from: Liu, Casey and Pike, BBRC 245: 684-690 (1998)

    E-Print Network [OSTI]

    Pike, Linda J.

    1998-01-01

    mixture in the bottom of a 13 ml centrifuge tube for the SW41 rotor. Add 6 ml 35% sucrose in MBS in SW41 rotor for 3 hr at 39,000 rpm (175,000 x g). 8. Remove gradients and fractionate into 10

  8. Hydrostatic bearings for a turbine fluid flow metering device

    DOE Patents [OSTI]

    Fincke, J.R.

    1982-05-04

    A rotor assembly fluid metering device has been improved by development of a hydrostatic bearing fluid system which provides bearing fluid at a common pressure to rotor assembly bearing surfaces. The bearing fluid distribution system produces a uniform film of fluid between bearing surfaces and allows rapid replacement of bearing fluid between bearing surfaces, thereby minimizing bearing wear and corrosion. 3 figs.

  9. High temperature ceramic/metal joint structure

    DOE Patents [OSTI]

    Boyd, Gary L. (Tempe, AZ)

    1991-01-01

    A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

  10. Method and machine for high strength undiffused brushless operation

    DOE Patents [OSTI]

    Hsu, John S.

    2003-06-03

    A brushless electric machine (30) having a stator (31) and a rotor (32) and a main air gap (34), the rotor (32) having pairs of rotor pole portions (22b, 22c, 32f, 32l) disposed at least partly around the axis of rotation (32p) and facing the main air gap (24b, 24c, 34), at least one stationary winding (20b, 20c, 33b) separated from the rotor (22b, 22c, 32) by a secondary air gap (23b, 23c, 35) so as to induce a rotor-side flux in the rotor (22b, 22c, 32) which controls a resultant flux in the main air gap (24b, 24c, 34). PM material (27b, 27c) is disposed in spaces between the rotor pole portions (22b, 22c, 32f, 32l) to inhibit the rotor-side flux from leaking from said pole portions (22b, 22c, 32f, 32l) prior to reaching the main air gap (24b, 24c, 34). By selecting the direction of current in the stationary winding (20b, 20c, 33b) both flux enhancement and flux weakening are provided for the main air gap (24b, 24c, 34). The stationary windings (31a, 33b) which are used for both primary and secondary excitation allow for easier adaptation to cooling systems as described. A method of non-diffused flux enhancement and flux weakening is also disclosed.

  11. Simplified Hybrid-Secondary Uncluttered Machine And Method

    DOE Patents [OSTI]

    Hsu, John S [Oak Ridge, TN

    2005-05-10

    An electric machine (40, 40') has a stator (43) and a rotor (46) and a primary air gap (48) has secondary coils (47c, 47d) separated from the rotor (46) by a secondary air gap (49) so as to induce a slip current in the secondary coils (47c, 47d). The rotor (46, 76) has magnetic brushes (A, B, C, D) or wires (80) which couple flux in through the rotor (46) to the secondary coils (47c, 47d) without inducing a current in the rotor (46) and without coupling a stator rotational energy component to the secondary coils (47c, 47d). The machine can be operated as a motor or a generator in multi-phase or single-phase embodiments. A method of providing a slip energy controller is also disclosed.

  12. Method and apparatus for automated processing and aliquoting of whole blood samples for analysis in a centrifugal fast analyzer

    DOE Patents [OSTI]

    Burtis, Carl A. (Oak Ridge, TN); Johnson, Wayne F. (Loudon, TN); Walker, William A. (Knoxville, TN)

    1988-01-01

    A rotor and disc assembly for use in a centrifugal fast analyzer. The assembly is designed to process multiple samples of whole blood followed by aliquoting of the resultant serum into precisely measured samples for subsequent chemical analysis. The assembly requires minimal operator involvement with no mechanical pipetting. The system comprises (1) a whole blood sample disc, (2) a serum sample disc, (3) a sample preparation rotor, and (4) an analytical rotor. The blood sample disc and serum sample disc are designed with a plurality of precision bore capillary tubes arranged in a spoked array. Samples of blood are loaded into the blood sample disc in capillary tubes filled by capillary action and centrifugally discharged into cavities of the sample preparation rotor where separation of serum and solids is accomplished. The serum is loaded into the capillaries of the serum sample disc by capillary action and subsequently centrifugally expelled into cuvettes of the analytical rotor for analysis by conventional methods.

  13. Method for improved gas-solids separation

    DOE Patents [OSTI]

    Kusik, Charles L. (Lincoln, MA); He, Bo X. (Newton, MA)

    1990-01-01

    Methods are disclosed for the removal of particulate solids from a gas stream at high separation efficiency, including the removal of submicron size particles. The apparatus includes a cyclone separator type of device which contains an axially mounted perforated cylindrical hollow rotor. The rotor is rotated at high velocity in the same direction as the flow of an input particle-laden gas stream to thereby cause enhanced separation of particulate matter from the gas stream in the cylindrical annular space between the rotor and the sidewall of the cyclone vessel. Substantially particle-free gas passes through the perforated surface of the spinning rotor and into the hollow rotor, from when it is discharged out of the top of the apparatus. Separated particulates are removed from the bottom of the vessel.

  14. Method and apparatus for automated processing and aliquoting of whole blood samples for analysis in a centrifugal fast analyzer

    DOE Patents [OSTI]

    Burtis, C.A.; Johnson, W.F.; Walker, W.A.

    1985-08-05

    A rotor and disc assembly for use in a centrifugal fast analyzer. The assembly is designed to process multiple samples of whole blood followed by aliquoting of the resultant serum into precisely measured samples for subsequent chemical analysis. The assembly requires minimal operator involvement with no mechanical pipetting. The system comprises: (1) a whole blood sample disc; (2) a serum sample disc; (3) a sample preparation rotor; and (4) an analytical rotor. The blood sample disc and serum sample disc are designed with a plurality of precision bore capillary tubes arranged in a spoked array. Samples of blood are loaded into the blood sample disc by capillary action and centrifugally discharged into cavities of the sample preparation rotor where separation of serum and solids is accomplished. The serum is loaded into the capillaries of the serum sample disc by capillary action and subsequently centrifugally expelled into cuvettes of the analyticaly rotor for conventional methods. 5 figs.

  15. Multilayer radiation shield

    DOE Patents [OSTI]

    Urbahn, John Arthur (Saratoga Springs, NY); Laskaris, Evangelos Trifon (Niskayuna, NY)

    2009-06-16

    A power generation system including: a generator including a rotor including a superconductive rotor coil coupled to a rotatable shaft; a first prime mover drivingly coupled to the rotatable shaft; and a thermal radiation shield, partially surrounding the rotor coil, including at least a first sheet and a second sheet spaced apart from the first sheet by centripetal force produced by the rotatable shaft. A thermal radiation shield for a generator including a rotor including a super-conductive rotor coil including: a first sheet having at least one surface formed from a low emissivity material; and at least one additional sheet having at least one surface formed from a low emissivity material spaced apart from the first sheet by centripetal force produced by the rotatable shaft, wherein each successive sheet is an incrementally greater circumferential arc length and wherein the centripetal force shapes the sheets into a substantially catenary shape.

  16. Method for improved gas-solids separation

    DOE Patents [OSTI]

    Kusik, C.L.; He, B.X.

    1990-11-13

    Methods are disclosed for the removal of particulate solids from a gas stream at high separation efficiency, including the removal of submicron size particles. The apparatus includes a cyclone separator type of device which contains an axially mounted perforated cylindrical hollow rotor. The rotor is rotated at high velocity in the same direction as the flow of an input particle-laden gas stream to thereby cause enhanced separation of particulate matter from the gas stream in the cylindrical annular space between the rotor and the sidewall of the cyclone vessel. Substantially particle-free gas passes through the perforated surface of the spinning rotor and into the hollow rotor, from where it is discharged out of the top of the apparatus. Separated particulates are removed from the bottom of the vessel. 4 figs.

  17. Electrostatic generator/motor configurations

    DOE Patents [OSTI]

    Post, Richard Freeman

    2012-09-11

    Electrostatic generators/motors designs are provided that include a stator fixedly connected to a first central support centered about a central axis. The stator elements are attached to the first central support. Similarly, a second stator is connected to a central support centered about the central axis, and the second stator has stator elements attached to the second central support. A rotor is located between the first stator and the second stator and includes an outer support, where the rotor is rotatably centered about the central axis, the rotor having elements in contact with the outer support, each rotor element having an extending rotor portion that extends radially from the outer support toward the axis of rotation.

  18. Dovetail spoke internal permanent magnet machine

    DOE Patents [OSTI]

    Alexander, James Pellegrino (Ballston Lake, NY); EL-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Shah, Manoj Ramprasad (Latham, NY); VanDam, Jeremy Daniel (West Coxsackie, NY)

    2011-08-23

    An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets.

  19. High speed internal permanent magnet machine and method of manufacturing the same

    DOE Patents [OSTI]

    Alexander, James Pellegrino (Ballston Lake, NY); EL-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Shah, Manoj Ramprasad (Latham, NY); VanDam, Jeremy Daniel (West Coxsackie, NY)

    2011-09-13

    An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple permanent magnets for generating a magnetic field, which interacts with the stator magnetic field to produce torque. The permanent magnets are disposed between the stacks. The rotor assembly also includes multiple bottom wedges disposed on the bottom structures of the shaft and configured to hold the multiple stacks and the multiple permanent magnets.

  20. Rotary engine and method

    SciTech Connect (OSTI)

    Overman, K.

    1991-12-17

    This paper describes a rotary engine. It comprises: an engine block, the block defining an internal rotor cavity, a rotor, the rotor eccentrically positioned within the cavity, the block defining a combustion chamber, the combustion chamber positioned exteriorly of the rotor cavity and in fluid communication therewith, a pair of pistons, the pistons affixed to each other and slidably mounted within the rotor, an air inlet valve, the inlet valve positioned at one side of the combustion chamber, a dual acting outlet valve, the outlet valve comprising a top and a bottom rest, the outlet valve positioned at the other side of the combustion chamber, the combustion chamber defining both an outlet valve ceiling port and an outlet valve floor port, means to ignite fuel, the fuel ignition means located within the combustion chamber between the inlet and outlet valves, the block defining an exhaust port, the exhaust port spaced circumferentially from the combustion chamber and in fluid communication with the rotor cavity, the block defining an inlet port, and the inlet port circumfrentially spaced from the outlet port and in fluid communication with the rotor cavity.

  1. Experimental evaluation of rotary engine timing gear loads

    SciTech Connect (OSTI)

    Kulina, M.R.

    1986-01-01

    The function of the timing gear of a rotary engine is to control the angular velocity of the rotor in relation to that of the crankshaft. The only load on the gear consists of the friction load due to the rotor seals, the torsional motion of the rotor and any torque developed on the rotor caused by uneven pressure distribution across the rotor flank. In the design of the gear and attachments an estimate of the loads must be made. In the case of an aircraft engine, knowing the actual loads and designing accordingly would result in the most weight effective configuration. A specially instrumented stationary gear of a Deere 0.67 liter SCORE III rotary engine was used to measure the peak torque during test stand operation. The results of the test confirm that rotor friction and torsional motion (due to drive line dynamics) produce the prime gear load below 70% design speed. At the higher engine speeds, a sub-system resonance of the rotor contributes significantly to the total load on the gear. The results of this test, together with the results of three earlier tests conducted on stationary gears are used to establish a design guide. This design guide relates the stationary gear load to crankshaft mean torque and engine displacement.

  2. Brushless machine having ferromagnetic side plates and side magnets

    DOE Patents [OSTI]

    Hsu, John S

    2012-10-23

    An apparatus is provided having a cylindrical stator and a rotor that is spaced from a stator to define an annular primary air gap that receives AC flux from the stator. The rotor has a plurality of longitudinal pole portions disposed parallel to the axis of rotation and alternating in polarity around a circumference of the rotor. Each longitudinal pole portion includes portions of permanent magnet (PM) material and at least one of the longitudinal pole portions has a first end and an opposing second end and a side magnet is disposed adjacent the first end and a side pole is disposed adjacent the second end.

  3. Electrical machine

    DOE Patents [OSTI]

    Van Dam, Jeremy Daniel; Alexander, James Pellegrino; Lokhandwalla, Murtuza Yusuf

    2013-12-31

    In one embodiment, an apparatus includes a rotor shaft, at least one pole segment, at least one pole tip segment and at least one permanent magnet pair. The at least one pole segment is mechanically coupled to the rotor shaft. Each permanent magnet pair is disposed between the at least one pole segment and respective pole tip segment. The apparatus further includes at least one mechanical member that mechically restrains the at least one pole tip segment to at least one of the rotor shaft or the at least one pole segment.

  4. Coal feed lock

    DOE Patents [OSTI]

    Pinkel, I. Irving (Fairview Park, OH)

    1978-01-01

    A coal feed lock is provided for dispensing coal to a high pressure gas producer with nominal loss of high pressure gas. The coal feed lock comprises a rotor member with a diametral bore therethrough. A hydraulically activated piston is slidably mounted in the bore. With the feed lock in a charging position, coal is delivered to the bore and then the rotor member is rotated to a discharging position so as to communicate with the gas producer. The piston pushes the coal into the gas producer. The rotor member is then rotated to the charging position to receive the next load of coal.

  5. Electric machine for hybrid motor vehicle

    DOE Patents [OSTI]

    Hsu, John Sheungchun (Oak Ridge, TN)

    2007-09-18

    A power system for a motor vehicle having an internal combustion engine and an electric machine is disclosed. The electric machine has a stator, a permanent magnet rotor, an uncluttered rotor spaced from the permanent magnet rotor, and at least one secondary core assembly. The power system also has a gearing arrangement for coupling the internal combustion engine to wheels on the vehicle thereby providing a means for the electric machine to both power assist and brake in relation to the output of the internal combustion engine.

  6. Effect of Side Permanent Magnets for Reluctance Interior Permanent Magnet Reluctance Machines

    SciTech Connect (OSTI)

    Hsu, John S; Lee, Seong T; Wiles, Randy H; Coomer, Chester; Lowe, Kirk T

    2007-01-01

    A traditional electric machine uses two dimensional magnetic flux paths in its rotor. This paper presents the development work on the utilization of the third dimension of a rotor. As an example, the air gap flux of a radial gap interior permanent magnet motor can be significantly enhanced by additional permanent magnets (PM) mounted at the sides of the rotor. A prototype motor built with this concept provided higher efficiency and required a shorter stator core length for the same power output as the Toyota/Prius traction drive motor.

  7. System and method for cooling a super-conducting device

    DOE Patents [OSTI]

    Bray, James William (Niskayuna, NY); Steinbach, Albert Eugene (Schenectady, NY); Dawson, Richard Nils (Voorheesville, NY); Laskaris, Evangelos Trifon (Schenectady, NY); Huang, Xianrul (Clifton Park, NY)

    2008-01-08

    A system and method for cooling a superconductive rotor coil. The system comprises a rotatable shaft coupled to the superconductive rotor coil. The rotatable shaft may comprise an axial passageway extending through the rotatable shaft and a first passageway extending through a wall of the rotatable shaft to the axial passageway. The axial passageway and the first passageway are operable to convey a cryogenic fluid to the superconductive rotor coil through the wall of the rotatable shaft. A cryogenic transfer coupling may be provided to supply cryogenic fluid to the first passageway.

  8. Cooling system for rotating machine

    DOE Patents [OSTI]

    Gerstler, William Dwight (Niskayuna, NY); El-Refaie, Ayman Mohamed Fawzi (Niskayuna, NY); Lokhandwalla, Murtuza (Clifton Park, NY); Alexander, James Pellegrino (Ballston Lake, NY); Quirion, Owen Scott (Clifton Park, NY); Palafox, Pepe (Schenectady, NY); Shen, Xiaochun (Schenectady, NY); Salasoo, Lembit (Schenectady, NY)

    2011-08-09

    An electrical machine comprising a rotor is presented. The electrical machine includes the rotor disposed on a rotatable shaft and defining a plurality of radial protrusions extending from the shaft up to a periphery of the rotor. The radial protrusions having cavities define a fluid path. A stationary shaft is disposed concentrically within the rotatable shaft wherein an annular space is formed between the stationary and rotatable shaft. A plurality of magnetic segments is disposed on the radial protrusions and the fluid path from within the stationary shaft into the annular space and extending through the cavities within the radial protrusions.

  9. Mean flow and turbulence characteristics in whirling annular seals 

    E-Print Network [OSTI]

    Thames, Howard Davis

    1992-01-01

    of the test rig with the annular seal installed 15: Dimensions of the Annular Rotor . 16: Components of the 3D Laser Doppler Velocimetry System 15 17 . . 19 Figure 17: Raw Doppler signal with high frequency noise and pedestal Figure 18: Doppler signal.... Destabilizing forces tend to move the rotor of an annular seal from its centered position, and whirl usually follows. Whirl occurs when the center of the This thesis fo)Iows the style and format of the ASME Journal of Fluids Engineering. rotor precesses...

  10. Designing for Humidity Control in the Operating Rooms: Desiccant Dehumidification Case Study for HEALTHSOUTH Medical Center 

    E-Print Network [OSTI]

    Nunnelly, R. M.

    2004-01-01

    and is impregnated onto the substrate material of the rotor (or wheel). This desiccant rotor removes moisture in the vapor stage from the ?process? airstream by adsorption. This is the airstream that is to be dehumidified, whether it is all outside air or a... is that below the dewpoint of the coils. For example, in this case for the HEALTHSOUTH unit, the cooling coils dehumidify the ventilation air down to about 50F dewpoint (50.8F drybulb and 54.2 gr/#) and then the desiccant rotor dries the air further...

  11. Measurement of Truck Cab Flow in Support of Wind Turbine Testing

    SciTech Connect (OSTI)

    Larwood, S. M. (National Renewable Energy Laboratory); Acker, B.; Sencenbaugh, J. (Windlite Corporation)

    1998-12-17

    This report describes an experiment to measure the airflow over a truck cab that can be used to conduct steady-state tests on an 8-kW wind turbine. The cab airflow measurements were made to document the turbine inflow for analytical models. The airflow measurements were made with an array of anemometers positioned to represent the turbine rotor disk. The data showed that the influence of the truck cab was primarily in the lower sector of the rotor disk. The influence was negligible in the rest of the rotor disk.

  12. Halbach array generator/motor having mechanically regulated output voltage and mechanical power output

    DOE Patents [OSTI]

    Post, Richard F.

    2005-06-14

    A motor/generator has its stationary portion, i.e., the stator, positioned concentrically within its rotatable element, i.e., the rotor, along the axis of rotation of the rotor. The rotor includes a Halbach array of magnets. The voltage and power outputs are regulated by varying the radial gap in between the stator windings and the rotating Halbach array. The gap is varied by extensible and retractable supports attached to the stator windings that can move the windings in a radial direction.

  13. Design and Fabrication of cm-scale Tesla Turbines

    E-Print Network [OSTI]

    Krishnan, Vedavalli Gomatam

    2015-01-01

    variable torque_efficiency = (T1loss - setup.bearingloss) %torque losses T1 = rFlow.T1rotor. *torque_efficiency; eta= head_efficiency. *torque_efficiency; %= T1. /( 2*pi*Uo. *

  14. OAK RIDGE NATIONAL LABORATORY U. S. DEPARTMENT OF ENERGY

    E-Print Network [OSTI]

    . - Preliminary work on the effect of indirect contamination effects due to outgassing of non-metallic materials · Contaminants - Direct water vapor and/or air - Outgassing of non-metallic rotor materials Copper Heatmeter AL

  15. Composite chiral structures for morphing airfoils: Numerical analyses and development of a manufacturing process

    E-Print Network [OSTI]

    Lausanne, Ecole Polytechnique Fédérale de

    , a variety of solutions have been proposed to provide aircraft wings and helicopter rotor blades is described as applied to the man- ufacturing of macro chiral components that are tested to evaluate

  16. Nonlinear Dynamics (2005) 41: 237273 c Springer 2005 Order Reduction of Parametrically Excited Nonlinear Systems

    E-Print Network [OSTI]

    Butcher, Eric A.

    2005-01-01

    coefficients such as the dynamics of rotating systems, like helicopter blades, asymmetric rotor-bearing systems and structures subjected to periodic loadings, etc. For the purpose of modal analysis, control and model test

  17. Gibbs Sampling in Open-Universe Stochastic Languages Nimar S. Arora

    E-Print Network [OSTI]

    Russell, Stuart

    is a directed binary tree, where each node is a predi- #12;WingType=Helicopter WingType RotorLength Blade- tial speedups over existing methods on sev- eral test cases, and substantially improves

  18. Inverse Problems, Design and Optimization Symposium (IPDO-2013) Albi, France, June 26-28, 2013

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    is a two-point shape optimization of a helicopter rotor blade in which the primary criterion is the Figure. This approach is first demonstrated over a test-case of aero-structural aircraft wing shape opti- mization

  19. Effects of axial turbine tip shroud cavity flow on performance and durability

    E-Print Network [OSTI]

    Palmer, Timothy R. (Timothy Richard)

    2015-01-01

    Flow through tip shroud cavity in a representative axial turbine vane-rotor stage environment is assessed for its role in loss generation and turbine durability. Steady and unsteady three-dimensional flow computations, ...

  20. A multi-scale approach to statistical and model-based structural health monitoring with application to embedded sensing for wind energy

    E-Print Network [OSTI]

    Taylor, Stuart Glynn

    2013-01-01

    an experimental rotor blade design that included a carbontest experience with this blade design, the duration of thisthree 9-m CX-100 blades, of the same design as that utilized