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Assessment of Wall Heat Transfer Models for Premixed-Charge Engine Combustion Computations
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Abstract
Two-dimensional computations of premixed-charge engine combustion were made using the KIVA-II code. The purpose of the study was to assess the influence of heat transfer and turbulence model boundary conditions on engine combustion predictions. Combustion was modeled using a laminar- and turbulent-characteristic-time model. Flow through the piston-cylinder-ring crevice was accounted for using a phenomenological crevice-flow model. The predictions were compared to existing cylinder pressure and wall heat transfer experimental data under motoring and fired conditions, at two engine speeds. Two different wall heat transfer model formulations were considered. The first is the standard wall function method. The second is based on solutions to the one-dimensional unsteady energy equation, formulated such that the standard wall function method is recovered in the quasi-steady limit. Turbulence was modeled using the standard k-ε turbulence model equations. However, the turbulence model boundary conditions were modified to account for compressibility effects by using a coordinate transformation in the wall region. The results show that the details of wall heat transfer and turbulence model boundary conditions influence heat transfer predictions greatly through their influence on the flame speed and the flame structure in the vicinity of the wall. Inclusion of compressibility and unsteadiness effects leads to increased wall heat flux values that agree better with measurements.
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Reitz, R., "Assessment of Wall Heat Transfer Models for Premixed-Charge Engine Combustion Computations," SAE Technical Paper 910267, 1991, https://doi.org/10.4271/910267.Also In
References
- Borman, G.L. Nishiwaki, K. “Internal-Combustion Engine Heat Transfer,” Prog. Energy Combust Sci. 13 1 46 1987
- Yang, J. Martin, J.K. “Approximate Solution - One-Dimensional Energy Equation for Transient, Compressible, Low Mach Number Turbulent Boundary Layer Flows,” Journal of Heat Transfer 111 619 624 1989
- Yang, J. Martin, J.K. “Predictions of the Effects of High Temperature Walls, Combustion, and Knock on Heat Transfer in Engine-Type Flows,” SAE Technical Paper 900690 1990
- Huh, K.Y. Chang, I.-P. Martin, J.K. “A Comparison of Boundary Layer Treatments for Heat Transfer in IC Engines,” SAE Technical Paper 900252 1990
- Amsden, A.A. O'Rourke, P.J. Butler, T.D. “KIVA-II - A Computer Program for Chemically Reactive Flows with Sprays,” Los Alamos National Labs. 1989
- Abraham, J. Bracco, F.V. Reitz, R.D. “Comparisons of Computed and Measured Premixed Charge Engine Combustion,” Combustion and Flame 60 309 322 1985
- Kuo, T.-W. Reitz, R.D. “Computations of Premixed-Charge Combustion in Pancake and Pent-Roof Engines SAE Technical Paper 890670 1989
- Namazian, M. Heywood, J.B. “Flow in the Piston-Cylinder-Ring Crevices of a Spark-Ignition Engine: Effect on Hydrocarbon Emissions, Efficiency and Power,” S A E Transactions 91 261 288 1982
- Reitz, R.D. Kuo, T.-W. “Modeling of HC Emissions Due to Crevice Flows in Premixed-Charge Engines,” SAE Technical Paper 892085
- Jennings, M.J. Morel, T. “An Improved Near Wall Heat Transfer Model for Multidimensional Engine Flow Calculations,” SAE Technical Paper 900251 1990
- Groff, E.G. Alkidas, A.C. Meyers, J. P. “Combustion Data for an Axisymmetric Homogeneous-Charge Spark-Ignition Engine,” GM Research Publication GMR-3577 February 1981
- Alkidas, A.C. “Heat Transfer Characteristics of a Spark-Ignition Engine,” Journal of Heat Transfer 102 189 193 1980
- Launder, B.E. Spalding, D.B. “The Numerical Computation of Turbulent Flows,” Computer Methods in Applied Mechanics and Engineering 3 269 289 1974
- Grasso, F. Wey, M.-J. Bracco, F.V. Abraham, J. “Three-Dimensional Computations of Flows in a Stratified-Charge Rotary Engine,” SAE technical Paper 870409 1987
- Metgalchi, M. Keck, J. “Burning Velocities of Mixtures of Air with Methanol, Isooctane, and Indolene at High Pressure and Temperature,” Combustion and Flame 48 191 210 1982
- Boggs, D.L. “Spatially-Resolved Measurements of Instantaneous Engine Heat Flux,” University of Wisconsin-Madison 1990