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Improving Near-Wall Combustion and Wall Heat Transfer Modeling in SI Engine Computations
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Abstract
Recent direct numerical simulations of constant density isobaric turbulent flame-wall interaction have lead to the development of a wall model that can easily be implemented in turbulent combustion models used in conventional CFD codes (as e.g. flamelet models). An essential point of this model is the estimation of the mean heat loss of the turbulent flame brush to the cold combustion chamber walls, emphasizing the need for an accurate description of the boundary conditions on solid walls in terms of wall heat transfer and turbulence. With regard to mesh size and computing time, most industrial CFD codes use high-Reynolds number k - ϵ turbulence models in conjunction with a law-of-the-wall to describe near wall flow conditions. One important assumption for the validity of the law-of-the-wall is that the near wall flow is isothermal, the fluid properties in this region thus being regarded as constant. This assumption is obviously erronous in flows combining hot gases (generated by combustion and/or compression) with cold walls, as in IC engines.
We present a formulation of the law-of-the-wall that is equivalent to the classical one when the wall flow is isothermal and takes into account effects of variable fluid properties for non-isothermal conditions. A modification of the above cited turbulent combustion model is proposed to describe non-isobaric flame-wall interaction in SI engines. Both models are implemented in the KIVA-II code and are first validated on a simple axisymmetric pancake SI engine. The new models are shown to more accurately reproduce experimental local wall heat fluxes and pressure/time histories than the original ones. Finally, computations of intake and combustion in a 4-valve SI engine geometry show the ability of the new models to reproduce global engine characteristics quite satisfactorily over a range of operating parameters.
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Angelberger, C., Poinsot, T., and Delhay, B., "Improving Near-Wall Combustion and Wall Heat Transfer Modeling in SI Engine Computations," SAE Technical Paper 972881, 1997, https://doi.org/10.4271/972881.Also In
References
- Alkidas A.C. Heat transfer characteristics of a spark-ignition engine ASME J. of Heat Transfer 102 189 193 May 1980
- Hayes T.K. White R.A. Peters J.E. Combustion chamber temperature and instantaneous heat flux measurements in a spark ignition engine SAE Technical Paper , 930217 1993
- Daniel W.A. Why engine variables affect exhaust hydrocarbon emission SAE Technical Paper , 700108 1970
- LoRusso J.A. Lavoie G.A. Kaiser E.W. An electrohydraulic gas sampling valve with application to hydrocarbon emissions studies SAE Technical Paper , 800045 1980
- Haskell W.W Legate C.E. Exhaust hydrocarbon emissions from gasoline engines-Surface phenomena SAE Technical Paper , 720255 1972
- Ezekoye O.A. Greif R. A comparison of one and two-dimensional flame quenching heat transfer results ASME Heat Transfer in Fire and Comb Systems 250 11 20 1993
- Connelly L. Ogasawara T. Lee D. Greif R. Sawyer R.F. Ezekoye O. Stagnation quenching of laminar, methane-air flames in a constant volume chamber: Wall temperature effect Fall Meeting WSCI 93-077 The Combustion Institute/Western States Section Stanford, CA, USA 1993
- Ezekoye O.A. Greif R. Sawyer R.F. Increased surface temperature effects on wall heat transfer during unsteady flame quenching Symp. (Int.) Combustion Institute , 24th 1465 1472 1992
- Wichman I.S. Bruneaux G. Head-on quenching of a premixed flame by a cold wall Combustion & Flame 103 296 310 1995
- Westbrook C.K. Adamczyk A.A. Lavoie G.A. A numerical study of laminar flame wall quenching Combustion & Flame 40 81 99 1981
- Kiehne T.M. Mathhews R.D. Wilson D.E. The significance of intermediate HCs during wall quench of propane flames Symp. (Int.) Combustion Institute , 21st 481 489 1986
- Popp P. Baum M. Heat transfer and pollutant formation mechanisms in insulated combustion chambers SAE Technical Paper , 952387 1995
- Popp P. Baum M. Analysis of wall heat fluxes, reaction mechanisms and unburnt hydrocarbons during the head-on quenching of a laminar methane flame Combustion & Flame 108 327 348 1997
- Popp P. Smooke M. Baum M. Heterogeneous/homogeneous reaction and transport coupling during flame-wall interaction Symp. (Int.) Combustion Institute , 26th 2693 2700 1996
- Kaiser E. W. Adamczyk A.A. Lavoie G.A. The effect of oil layers on the hydrocarbon emissions generated during closed vessel combustion Symp. (Int.) Combustion Institute , 18th 1881 1890 1981
- Saffman M. Parametric study of a side wall quench layer Combustion & Flame 55 141 159 1984
- Adamczyk A.A. Lavoie G.A. Laminar head-on flame quenching-A theoretical study SAE Technical Paper , 780969 3652 3670 1978
- Jennings M.J. Morel T. A computational study of wall temperature effects on engine heat transfer SAE Technical Paper , 910459 1991
- Jennings M.J. Multi-dimensional modeling of turbulent premixed charge combustion SAE Technical Paper , 920589 1992
- Bruneaux G. Akselvoll K. Poinsot T. Ferziger J.H. Simulation of a turbulent flame in a channel. Report, CRCT 1993-1994
- Bruneaux G. Poinsot T. Ferziger J.H. Premixed flame-wall interaction in a turbulent channel flow: Budget for the flame surface density evolution equation and modeling submitted JFM 1997
- Bruneaux G. Etude asymptotique, simulation numérique directe et modélisation de l'interaction flamme turbulente prémélangée-paroi Ecole Centrale Paris 1996
- Launder B.E. Spalding D.B. The numerical computation of turbulent flows Computer Methods in appi. Mech. and Eng. 3 269 289 1974
- Diwakar R. Assessment of the ability of a multidimensional computer code to model combustion in a homogeneous-charge engine SAE Technical Paper , 840230 March 1984
- Reitz R.D. Assessment of wall heat transfer models for premixed-charge engine combustion computations SAE Technical Paper , 910267 1991
- Amsden A.A. O'Rourke P.J. Butler T.D. KIVA II: A computer program for chemically reactive flows with sprays Los Alamos National Laboratory New Mexico 87545 1989
- Boudier P. Henriot S. Poinsot T. Baritaud T. A model for turbulent flame ignition and propagation in spark ignited engines Symp. (Int.) Combustion Institute , 24th 503 510 1992
- Baum M. Poinsot T. Effects of mean flow on premixed flame ignition Combustion Science and Technology 1995
- Marble F.E. Broadwell J.E. The coherent flame model for turbulent chemical reactions Purdue University Technical Report TRW 1977
- Candel S. Veynante D. Lacas F. Maistret E. Darabiha N. Poinsot T. Coherent flame model: Applications and recent extensions Larrouturou World Scientific Singapore 1990
- Candel S. Poinsot T. Flame stretch and the balance equation for the flame area Combustion Science and Technology 70 1 15 1990
- Duelos J.M. Veynante D. Poinsot T. A comparison of flamelet models for premixed turbulent combustion Combustion & Flame 95 101 117 1993
- Menevaux C. Poinsot T. Stretching and quenching of flamelets in premixed turbulent combustion Combustion & Flame 86 311 332 1991
- Metghalchi M. Keck J.C. Burning velocities of mixtures of air with methanol, isooctane and indolene at high pressure and temperature Combustion & Flame 48 191 210 1982
- Duelos J. M. Bruneaux G. Baritaud T. 3D modeling of combustion and pollutants in a 4-valve SI engine: effect of fuel and residual distribution and spark location SAE Technical Paper October 1996
- Williams F. A. Combustion Theory Combustion, Science and Engineering Addison-Wesley 2nd 1985
- 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
- Jennings M.J. Morel T. An improved near wall heat transfer model for multidimensional engine flow calculation SAE Technical Paper , 900251 1990
- Kays W.M. Crawford M.E. Convective Heat and Mass Transfer McGraw-Hill New York 3rd 1994
- Chyou S. Sleicher C.A. Can one-and twoequation turbulence models be modified tp calculate turbulent heat transfer with variable properties? Ind. Eng. Chem. Res. 31 756 759 1992
- Han Z. Reitz R.D. A temperature wall function formulation for variable density turbulent flows with application in engine onvective heat transfer modeling Int. J. of Heat and Mass Transfer 40 3 613 625 1997
- Groff E.G. Alkidas A.C. Myers J.P. Combustion data for an axisymmetric homogeneous-charge spark-ignition engine Research Publication GMR-3577 GM Research Labs. 1981
- Alkidas A.C. Myers J.P. Transient heat-flux measurements in the combustion chamber of a spark-ignition engine ASME J. of Heat Transfer 104 62 67 February 1982
- Kuo T.W. Reitz R.D. Computation of premixed-charge combustion in pancake and pentroof engines SAE Technical Paper , 890670 1989
- Abraham J. Bracco F.V. Reitz R.D. Comparison of computed and measured premixed charge engine combustion Combustion & Flame 60 309 322 1985
- Steiner T. Boulouchos K. Near-wall unsteady premixed flame propagation in S.I. engines SAE Technical Paper , 951001 1995
- Gilabert P. Pinchon P. Revue de l'Institut Français du Pétrole 44 1 1989
- Delhaye B. Cousyn B. Computation of flow and combustion in spark ignition engine and comparison with experiment SAE Technical Paper , 961960 October 1996
- Woschni G. A universally applicable equation for the instantaneous heat transfer coefficient in the internal combustion engine SAE Technical Paper , 670931 1967
- Al-Shaalan T.M. Rutland C. Premixed turbulent flames in channel flow 6th SIAM 163 164 1995