skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Modeling Radiative Heat Transfer and Turbulence-Radiation Interactions in Engines

Abstract

Detailed radiation modelling in piston engines has received relatively little attention to date. Recently, it is being revisited in light of current trends towards higher operating pressures and higher levels of exhaust-gas recirculation, both of which enhance molecular gas radiation. Advanced high-efficiency engines also are expected to function closer to the limits of stable operation, where even small perturbations to the energy balance can have a large influence on system behavior. Here several different spectral radiation property models and radiative transfer equation (RTE) solvers have been implemented in an OpenFOAM-based engine CFD code, and simulations have been performed for a full-load (peak pressure ~200 bar) heavy-duty diesel engine. Differences in computed temperature fields, NO and soot levels, and wall heat transfer rates are shown for different combinations of spectral models and RTE solvers. The relative importance of molecular gas radiation versus soot radiation is examined. And the influence of turbulence-radiation interactions is determined by comparing results obtained using local mean values of composition and temperature to compute radiative emission and absorption with those obtained using a particle-based transported probability density function method.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3]
  1. Pennsylvania State Univ., University Park, PA (United States)
  2. Marquette University (United States)
  3. University of California Merced (United States)
Publication Date:
Research Org.:
The Pennsylvania State University
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1354685
DOE Contract Number:
EE0007278
Resource Type:
Conference
Resource Relation:
Conference: 10th U.S. National Combustion Meeting, College Park, MD, 23-26 April 2017
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Paul, Chandan, Sircar, Arpan, Ferreyro-Fernandez, Sebastian, Imren, Abdurrahman, Haworth, Daniel C, Roy, Somesh P, Ge, Wenjun, and Modest, Michael F. Modeling Radiative Heat Transfer and Turbulence-Radiation Interactions in Engines. United States: N. p., 2017. Web.
Paul, Chandan, Sircar, Arpan, Ferreyro-Fernandez, Sebastian, Imren, Abdurrahman, Haworth, Daniel C, Roy, Somesh P, Ge, Wenjun, & Modest, Michael F. Modeling Radiative Heat Transfer and Turbulence-Radiation Interactions in Engines. United States.
Paul, Chandan, Sircar, Arpan, Ferreyro-Fernandez, Sebastian, Imren, Abdurrahman, Haworth, Daniel C, Roy, Somesh P, Ge, Wenjun, and Modest, Michael F. Wed . "Modeling Radiative Heat Transfer and Turbulence-Radiation Interactions in Engines". United States. doi:. https://www.osti.gov/servlets/purl/1354685.
@article{osti_1354685,
title = {Modeling Radiative Heat Transfer and Turbulence-Radiation Interactions in Engines},
author = {Paul, Chandan and Sircar, Arpan and Ferreyro-Fernandez, Sebastian and Imren, Abdurrahman and Haworth, Daniel C and Roy, Somesh P and Ge, Wenjun and Modest, Michael F},
abstractNote = {Detailed radiation modelling in piston engines has received relatively little attention to date. Recently, it is being revisited in light of current trends towards higher operating pressures and higher levels of exhaust-gas recirculation, both of which enhance molecular gas radiation. Advanced high-efficiency engines also are expected to function closer to the limits of stable operation, where even small perturbations to the energy balance can have a large influence on system behavior. Here several different spectral radiation property models and radiative transfer equation (RTE) solvers have been implemented in an OpenFOAM-based engine CFD code, and simulations have been performed for a full-load (peak pressure ~200 bar) heavy-duty diesel engine. Differences in computed temperature fields, NO and soot levels, and wall heat transfer rates are shown for different combinations of spectral models and RTE solvers. The relative importance of molecular gas radiation versus soot radiation is examined. And the influence of turbulence-radiation interactions is determined by comparing results obtained using local mean values of composition and temperature to compute radiative emission and absorption with those obtained using a particle-based transported probability density function method.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 26 00:00:00 EDT 2017},
month = {Wed Apr 26 00:00:00 EDT 2017}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • The effects of an external source of thermal radiation on a three-dimensional hypersonic turbulent boundary layer over a sharp cone at an angle of attack are evaluated using three radiative interaction formulations: (1) an optically thin limit approximation, (2) an optically thick limit approximation, and (3) a band approximation for the wavelength-dependent properties of the medium. Interactions between radiation and the boundary layer are determined by solving numerically three-dimensional compressible turbulent boundary layer equations together with the energy equation modified to include thermal radiation. It is shown that the total heat flux to the wall is increased by an ordermore » of magnitude due to the external source of radiation as compared with the case in which there is no radiation.The band approximation, in general, gives the most accurate results, but requires excessive computer time the optically thin formulation gives reasonably accurate results with moderate computer times.« less
  • This paper illustrates use of the first and the third order spherical harmonics approximation to the radiative transfer equation and the delta-Eddington approximation to the scattering phase function for droplets in the flow. Solutions are presented for an axisymmetric, finite cylindrical geometry and assumed distributions for temperature, soot and fuel droplets chosen to be representative of conditions in a diesel engine during combustion. Results are obtained numerically by an accurate finite difference scheme. Important goals of this paper are to investigate the importance of scattering by fuel droplets and of accounting for spatial variations in the extinction coefficient on themore » radiative flux distributions at the walls of a disc shaped diesel engine. 21 references, 16 figures.« less
  • In the first section on heat transfer in microgravity, the papers cover phase-change phenomena and thermocapillary flows and surface effects. In the second section, several papers cover solution methods for radiative heat transfer while the rest cover heat transfer in low-temperature environments. The last section covers papers containing valuable information for thermal contact conductance of various materials plus papers on inverse problems in heat transfer. Separate abstracts were prepared for most papers in this volume.
  • A detailed research program has been initiated to study the modeling aspects of turbulent heat transfer in engine applications using multi-dimensional codes. The main concerns are the representation of turbulent transport in flow regions that differ significantly from constant-pressure boundary layers for which the currently used models have been developed and validated. Both the treatment of near-wall and bulk-flow transport are being investigated. Models are being tested on several representative test cases. A number of such test cases have been identified, which contain key flow features relevant to engine applications and for which a good experimental data base exists. Calculationsmore » of these test cases have been made using a standard kappa-epsilon model. These calculations pointed out deficiencies in the model, and work is now in progress on alternative approaches to the modeling of turbulent transport processes, which would represent the essential physics and provide better correlation with experiments.« less
  • The interactions between turbulence and radiation, although acknowledged and qualitatively understood over the last several decades, are extremely difficult to model. Traditional Eulerian turbulence models are incapable of addressing the closure problem for any realistic reactive flow situation, because of the large number of unknown turbulent moments that need to be modeled. A novel approach, based on the velocity-composition joint probability density function (PDF) method, is presented. This approach is Lagrangian in nature and provides an elegant and feasible alternative to turbulence closure. A mixed Monte Carlo/finite-volume technique is used to simulate a bluff-body-stabilized methane-air diffusion flame in a two-dimensionalmore » planar recirculating combustor, and enables treatment of turbulence in recirculating flows, finite-rate chemistry, and multiple-band radiation calculations within the CPU limitations of a standard single-processor workstation. Results demonstrate the role of radiation and turbulence-radiation interactions in altering the overall flame structure, the wall heat loads, and the overall heat emission by the flame at various Reynolds numbers and equivalence ratios.« less