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Development and Validation of a Knock Model in Spark Ignition Engines Using a CFD code
Technical Paper
2002-01-2701
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Currently, the development of higher specific output and higher efficiency S.I. engines requires better control and knowledge of knock mechanisms. As it is not easily possible to instrument an engine to determine the beginning of fuel auto-ignition, knock modeling by means of 3D CFD simulation, can be a powerful tool to understand and try to avoid this phenomenon [1, 2, 3]. The objectives of the work described in this paper are to develop and validate a simple model of auto-ignition.
This model, developed at IFP, is implemented in the 3D CFD code KMB [4, 5]. It is based on an AnB model [6, 7] which creates a ‘precursor’ species transported with the flow in the combustion chamber. When its concentration reaches a limiting value, the auto-ignition phenomenon occurs.
This model is used for a large range of engine conditions by varying the fuel injection method (DISI or PFI), spark advance, air/fuel ratio, spark location, internal flow, load, engine speed and cylinder head temperature (uniform or not). The computed delays for knock occurrence are compared with experimental data obtained on a single-cylinder engine, equipped with a pressure transducer. In most cases, the differences never exceeded one crank angle degree. The results suggest that, even if this model is based on a relatively simple chemical mechanism, it is able to give a good overall estimation and reproduce all the experimental trends. Moreover, using KMB, the location of the knock occurrence in the chamber could be found and used to propose combustion chamber shape and cooling circuit modifications.
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Authors
- F.-A. Lafossas - IFP
- M. Castagne - IFP
- J. P. Dumas - IFP
- S. Henriot - IFP
Topic
Citation
Lafossas, F., Castagne, M., Dumas, J., and Henriot, S., "Development and Validation of a Knock Model in Spark Ignition Engines Using a CFD code," SAE Technical Paper 2002-01-2701, 2002, https://doi.org/10.4271/2002-01-2701.Also In
References
- DENT J.C. DAS S. BLUNSDON C.A. “Application of Computational Fluid Dynamics to the Study of Conditions Relevant to Autoignition Damage in Engines” SAE paper 961963 1996
- NISHIWAKI K. YOSHINOBU Y. SAIJYO K. “Numerical Analysis of the Location of Knock Initiation in S.I. Engines” SAE paper 2000-01-1897 2000
- ATTAR A. ALIZADETH KARIM G.A. “An Analytical Approach for the Optimization of a SI Engine Performance Including the Consideration of Knock” SAE paper 981463 1998
- HABCHI C. TORRES A. “A 3D multi-block structured version of KIVA-2 code” First European CFD conference proceedings 1 502 512 1992
- TORRES A. HENRIOT S. “Modeling the Effects of EGR Inhomogeneities Induced by Intake Systems in a Four-Valves Engine” SAE paper 961959 1996
- DOUAUD A.M. EYZAT P. “Four Octane Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines” SAE paper 780080 1978
- GUIBET J.C FAUTRE-BIRCHEM E. “Fuels and Engines: Technology, energy, environment” 1 1996
- BLUNSDON C.A. DENT J.C. “The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry” SAE paper 940524 1994
- SCHAPERTONS H. LEE W. “Multidimensional Modelling of Knocking Combustion in SI Engines” SAE paper 850502 1985
- 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 1989
- DUCLOS J.M. ZOLVER M. “3D Modeling of Intake, Injection and Combustion in a DISI Engine under Homogeneous and Stratified Operating Conditions” 4 th International symposium on diagnostics and modeling of combustion in internal combustion engines 335 340 COMODIA 1998
- HO S.Y. KUO T.-W. “a Hydrocarbon Autoignition Model for Knocking Combustion in SI Engines” SAE paper 971672 1997
- CARGO P. 1997
- HALSTEAD M.P. KIRSCH J.L. PROTHERO A. QUINN C.P. ‘The auto-ignition of hydrocarbon fuels at high temperatures and pressures - fitting of a mathematical model’ Combustion and Flame 30 45 60 1977
- AFFLECK W.S. THOMAS A. ‘An opposed piston rapid compression machine for preflame reaction studies’ Proc. Inst. Mech. Engrs. 365 385 1968
- ANGELBERGER C. POINSOT T. DELHAYE B. ‘Improving near-wall combustion and wall heat transfer modeling in SI engine computations’ SAE paper 972881 1997
- KAYS W.M. CRAWFORD M.E. HILL Mc GRAW “Convection Heat and Mass Transfer” New York 3rd 1994
- TORRES A. HENRIOT S. “3D Modeling of Combustion in Lean Burn Four Valve Engines: Influence of Intake Configuration” 3 th international Symposium on Diagnostics and Modeling of Combustion in Internal Combustion engines 139 156 COMODIA 1994
- CASTAGNE M. DUMAS J.-P. LAFOSSAS F.-A. HENRIOT S. 2003