This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Numerical Study on Knock for an SI Engine by Thermally Coupling Combustion Chamber and Cooling Circuit Simulations
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
Annotation ability available
The present research focuses on the understanding and improved prediction of knock at full load in a four-cylinder passenger car spark-ignition (SI) engine using computational fluid dynamics (CFD) methodology. The emphasis is on the possibility of controlling the knock limit via optimised engine cooling mechanisms. To date, CFD simulations of the combustion chamber and cooling circuit are performed separately, while chamber wall temperatures are derived from either experiments or experience. This, however, entails the risk of employing inadequate boundary and hence in-cylinder conditions for a combustion and knock simulation.
CFD simulations are performed for all four combustion chambers and metal components, including the cooling circuit. Both types of simulations are thermally coupled via the conditions on the chamber walls. Several engine cycles are simulated with the knock model switched off to converge in terms of wall temperatures and in-cylinder conditions, therefore allowing for more appropriate conditions in the combustion chambers. Thereafter one engine cycle is calculated including the knock model.
A sensitivity study for wall temperatures on knock was performed. The CFD results were compared against local wall temperature measurements on the cylinder head and engine block. The predictions reveal a highly non-uniform temperature distribution on the chamber walls. It is also demonstrated that knock is influenced primarily by the wall temperatures via the resulting thermodynamic state of the in-cylinder mixture due to wall heat transfer rather than via local wall temperature effects.
CitationKleemann, A., Menegazzi, P., Henriot, S., and Marchal, A., "Numerical Study on Knock for an SI Engine by Thermally Coupling Combustion Chamber and Cooling Circuit Simulations," SAE Technical Paper 2003-01-0563, 2003, https://doi.org/10.4271/2003-01-0563.
Computer Aided Engineering of Vehicle & Engine Systems & Components
Number: SP-1740 ; Published: 2003-03-03
Number: SP-1740 ; Published: 2003-03-03
- Stone R. Introduction to Internal Combustion Engines. Macmillan Press Ltd, 3rd edition, London, 1999.
- Heywood J.B. Internal Combustion Engine. Automotive Technology Series. McGraw-Hill Book Company, New York, 1988.
- König G. and Sheppard C.G.W End Gas Autoignition and Knock in a Spark Ignition Engine. SAE Technical Paper Series, No. 902135, 1990.
- Syrimis M., Shigahara K. and Assanis D. Correlation Between Knock Intensity and Heat Transfer Under Light and Heavy Knocking Conditions in a Spark Ignition Engine. SAE Technical Paper Series, No. 960495, 1996.
- Nates R.J. Thermal stresses induced by knocking combustion in spark-ignition engines. SAE Technical Paper Series, No. 2000-01-1238, 2000.
- Westin F., Grandin B., Ångström H.-E. The Influence of Residual Gases on Knock in Turbocharged SIEngines. SAE Technical Paper Series, No. 2000-01-2840, 2000.
- Russ S. A Review of the Effect of Engine Operating Conditions on Borderline Knock. SAE Technical Paper Series, No. 960497, 1996.
- Towers J.M. and Hoekstra R.L. Engine knock, a renewed concern in motorsports - A literature review. SAE Technical Paper Series, No. 983026, 1998.
- Grandin B., Ångström H.-E., Stålhammar P. and Olofsson E. Knock Suppression in a turbucharged SI Engine by Using Cooled EGR. SAE Technical Paper Series, No. 982476, 1998.
- Grandin B. and Ångström H.-E. Replacing Fuel Enrichment in a Turbocharged SI Engine; Lean Burn or Cooled EGR. SAE Technical Paper Series, No. 1999-01-3505, 1999.
- Habchi C. and Torres A. A 3D multi-block structured version of the KIVA-2 code. In Proceedings of the First European CFD conference, Vol. 1, pp. 502-512, 1992.
- Amsden A.A., O'Rourke P.J. and Butler T.D. KIVA II: A Computer Program for Chemically Reactive Flows with Sprays. Technical report No LA-11560-MS, Los Alamos National Laboratory, May 1989.
- Versteeg H.K. and Malalasekera W. An Introduction to Computational Fluid Dynamics - The Finite Volume Method. Longman Scientific & Technical, Essex, 1995.
- Angelberger C., Poinsot T. and Delhaye B. Improving Near-Wall Combustion and Wall Heat Transfer Modeling in SI Engine Computations. SAE Technical Paper Series, No. 972881, 1997.
- Duclos J.M. and Zolver M. 3D Modeling of Intake, Injection and Combustion in a DISI Engine under Homogeneous and Stratified Operating Conditions. In The Fourth International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines, COMODIA 98, Kyoto, Japan, Engine Systems Division, The Japan Society of Mechanical Engineers, pp. 335-340, 20-23 July, 1998.
- Duclos J.-M., Zolver M. and Baritaud T. 3D Modeling of Combustion for DI-SI Engines. Oil & Gas Science and Technology - Revue de l'IFP, Vol. 54, No. 2, pp. 259-264, 1999.
- Douaud A.M. and Eyzat P. Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines. SAE Technical Paper Series, No. 780080, Vol. 78, 1978.
- Guibet J.C. and Faure-Birchem E. Fuels and Engines: Technology, Energy and Environment. Vol. 1, Edition Technip, 1996.
- Lafossas F.-A., Castagne M., Dumas J.P. and Henriot S. Development and Validation of a Knock Model in Spark Ignition Engines Using a CFD Code. SAE Technical Paper Series, No. 2002-01-2701, 2002.
- FLUENT 5 User's Guide, Fluent Inc., Lebanon, USA, July 1998.
- Makkapati S., Poe S., Shaikh Z., Cross R. and Mikulec T. Coolant Velocity Correlations in an IC Engine Coolant Jacket. SAE Technical Paper Series, No. 2002-01-0238, 2002.
- Yakhot V. and Orszag S.A. Renormalization group analysis of turbulence. I. Basic theory. Journal of Scientific Computing, Vol. 1, pp. 1-51, 1986.
- Launder B.E. and Spalding D.B. The Numerical Computation of Turbulent Flows. Computer Methods in Applied Mechanics and Engineering, Vol. 3, pp. 269-289, 1974.