This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Examination of the Effects of Charge Inhomogeneity on the Compression Ignition of Fuel-Air Mixtures
Annotation ability available
Sector:
Language:
English
Abstract
The paper examines the rapid compression process of methane-air mixtures while using a zero-dimensional simulation and a detailed chemical kinetic scheme involving 137 reaction steps for methane-air combustion with an account made for heat transfer. The results of this simulation are compared with the corresponding values obtained when using multi-dimensional CFD simulation of the temporal and spatial evolution of the physical properties inside the cylinder while using KIVA-3 code both for reactive and non-reactive “methane”-air mixtures. The reaction rate data used in the code were overall rates of varyingly fitted data based on results of the full detailed kinetic scheme under the same local conditions. The effects of the non-uniformity in the charge physical properties due to heat transfer and compression effects on the evolution of the chemical processes leading to autoignition are presented and discussed. It is shown that major errors may result from the inadequate modelling of the nonuniform properties of the reactive charge during compression. These have serious implications to the interpretation of autoignition and knock phenomena in engines as well as the derivation of chemical kinetic parameters of reactive systems when obtained from observations made in motoring engines or rapid compression ignition apparatus.
Authors
Topic
Citation
Chen, K. and Karim, G., "An Examination of the Effects of Charge Inhomogeneity on the Compression Ignition of Fuel-Air Mixtures," SAE Technical Paper 982614, 1998, https://doi.org/10.4271/982614.Also In
References
- Park, P. Keck, J.C. “Rapid Compression Machine Measurements of Ignition Delays for Primary Reference Fuels” SAE Paper 900027 1990
- Karim, G.A. Watson, H.C. “Experimental and Analytical Studies of the Compression Ignition of Fuel-Oxidant Mixtures” Proc. Instn. Mech. Engrs. 183 1 12 1969
- Curran, H.J. Gaffuri, P. Pitz, W.J. Westbrook, C.K. Leppard, W.R. “Autoignition Chemistry in a Motored Engine: An Experimental and Kinetic Modeling Study” 26th Symposium (International) on Combustion The Combustion Institute 2669 2677 1996
- Karim, G.A. Watson, H.C. “Experimental and Computational Considerations of the Compression Ignition of Homogeneous Fuel-Oxidant Mixtures” SAE Paper 710133 1971
- Hastead, M.P. Kirsch, L.J. Quinn, C.P. “The Autoignition of Hydrocarbon Fuels at High Temperatures and Pressures -- Fitting of a Mathematical Model” Combust. Flame 30 45 60 1977
- Hu, H. Keck, J. “Autoignition of Adiabatically Compressed Combustible Gas Mixtures” SAE Paper 872110 1987
- Zel'dovich, Y.B. “Regime Classification of an Exothermic Reaction with Nonuniform Initial Conditions” Combust. Flame 39 211 214 1980
- Oppenheim, A.K. “The Knock Syndrome -- Its Cures and Its Victims” SAE Paper 841339 1984
- Minetti, R. Carlier, M. Ribaucour, M. Therssen, E. Sochet, L.R. “Comparison of Oxidation and Autoignition of the Two Primary Reference Fuels by Rapid Compression” 26th Symposium (International) on Combustion The Combustion Institute 747 753 1996
- Griffiths, J.F. Halford-Maw, P.A. Rose, D.J. “Fundamental Features of Hydrocarbon Autoignition in a Rapid Compression Machine” Combust. Flame 95 291 306 1993
- Chun, K.M. Heywood, J.B. Keck, J.C. “Prediction of Knock Occurrence in a Spark-Ignition Engine” 22nd Symposium (International) on Combustion The Combustion Institute 455 463 1988
- Cowart, J.S. Haghgooie, M. Newman, C.E. Davis, G.C. Pitz, W.J. Westbrook, C.K. “The Intensity of Knock in an Internal Combustion Engine: An Experimental and Modeling Study” SAE Paper 922327 1992
- Minetti, R. Carlier, M. Ribaucour, M. Therssen, E. Sochet, L.R. “A Rapid Compression Machine Investigation of Oxidation and Auto-Ignition of n-Heptane: Measurements and Modeling” Combust. Flame 102 298 309 1995
- Goyal, G. Warnatz, J. Maas, U. “Numerical Studies of Hot Spot Ignition in H2-O2 and Ch4-Air Mixtures” 23rd Symposium (International) on Combustion The Combustion Institute 1767 1773 1990
- Goyal, G. Maas, U. Warnatz, J. “Simulation of the Transition from Deflagration to Detonation” SAE Paper 900026 1990
- Bauerle, B. Warnatz, J. Behrendt, F. “Time-Resolved Investigation of Hot Spots in the End Gas of an S.I. Engine by Means of 2-D Double-Pulse LIF of Formaldehyde” 26th Symposium (International) on Combustion The Combustion Institute 2619 2626 1996
- Konig, G. Maly, R.R. Bradley, D. Lau, A.K.C. Sheppard, C.G.W. “Role of Exothermic Centres on Knock Initiation and Knock Damage” SAE Paper 902136 1990
- Bauerle, B. Hoffmann, F. Behrendt, F. Warnatz, J. 25th Symposium (International) on Combustion The Combustion Institute 135 141 1994
- Pan, J. Sheppard, C.G.W. “A Theoretical and Experimental Study of the Modes of End Gas Autoignition Leading to Knock in S.I. Engines” SAE Paper 942060 1994
- Griffiths, J.F. Jiao, Q. Schreiber, M. Meyer, J. Knoche, K.F. “Development of Thermokinetic Models for Autoignition in a CFD Code: Experimental Validation and Application of the Results to Rapid Compression Studies” 24th Symposium (International) on Combustion The Combustion Institute 1809 1815 1992
- Schreiber, M. Sadat, A. Poppe, C. Griffiths, J.F. Halford-Maw, P. Rose, D.J. “Spatial Structure in End-Gas Autoignition” SAE Paper 932758 1993
- Agarwal, A. Assanis, D.N. “Multi-dimensional Modeling of Natural Gas Ignition under Compression Ignition Conditions using Detailed Chemistry” SAE Paper 980136 1998
- Liu, Z. Karim, G.A. “An Analytical Examination of the Preignition Processes within Homogeneous Mixtures of a Gaseous Fuel and Air in a Motored Engine” SAE Paper 942039 1994
- Amsden, A.A. “KIVA-3: A KIVA Program with Block-Structured Mesh for Complex Geometries” Los Alamos National Laboratory Report LA-12503-MS 1993
- Chen, K. Karim, G.A. ASME Paper (ETCE 98-4726) 1 7 1998
- Hilsenrath, J. et al. “Tables of Thermal Properties of Gases” Circ. U.S. Bur. Standards 564 1955
- JANAF Thermochemical Tables Third ACS&AIP for U.S. National Bureau of Standards 1985
- Westbrook, C.K. Dryer, F.L. “Chemical Kinetic Modeling of Hydrocarbon Combustion” Prog. Energy Combust. Sci. 10 1 57 1984
- Karim, G.A. Khan, M.O. Moore, N.P.W. “Gross Chemical Kinetics from Motored Piston Engines” SAE Paper 700060 1970
- Khalil, E. Samuel, P. Karim, G.A. “An Analytical Examination of the Chemical Kinetics of the Combustion of n-Heptane-Methane Air Mixtures” SAE Paper 961932 1996