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Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation
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Abstract
In this paper a combustion diagnostic method is presented where measured pressure data is used to calculate the heat release, local temperatures and concentrations of NO and other species. This is done by a multizone model where the lambda value, i.e. 1/equivalence ratio, in each zone can be chosen arbitrarily. In homogenous charge engines lambda is given by the global air/fuel ratio. The local lambdas during initial combustion in stratified charge and diesel engines have to be estimated either as an average value or with a chosen distribution.
One new zone of each local lambda is generated and the temperature, volume and species in all old zones are updated at each time step of calculation. In this paper the model is demonstrated by using pressure data from pre-mixed and direct injected stratified charge natural gas SI engines and from a DI diesel engine.
The pre-mixed data is used to validate the model as such while the ambition in the stratified charge and diesel cases has been to find the average local lambda that gives the same NOx emission as measured. The emphasis in the latter cases has been to study the influence on average local lambda of the duration of the fuel injection. Early injected fuel seems to burn at slightly leaner mixtures than later injected.
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Egnell, R., "Combustion Diagnostics by Means of Multizone Heat Release Analysis and NO Calculation," SAE Technical Paper 981424, 1998, https://doi.org/10.4271/981424.Also In
References
- Heywood, J. B. “Internal Combustion Fundamentals” McGraw-Hill series in mechanical engineering 1988
- Grimm B. M. Johnson R.T. “Review of Simple Heat Release Computations” SAE Paper 900445 1990
- Foster D.E. “An Overview of Zero-Dimensional Thermodynamic Models for IC Engine Data analysis” SAE Paper 852070 1985
- Homsy, S.C. Atreya, A. “An Experimental Heat Release Rate Analysis of a Diesel Engine Operating Under Steady State Conditions” SAE Paper 970889 1997
- Callahan T.J. Yost, D.M. Ryan T.W. III, “Acquisition and Interpretation of Diesel Engine Heat Release Data” SAE Paper 852068 1985
- Yoshizaki, T. Nishida, K. Hiroyasu, H. “Approach to Low NOx and Smoke Emission Engines by Using Phenomenological Simulation” SAE Paper 930612 1993
- Szekely G.A. Jr, Alkidas, A.C. “A Two-Stage Heat-Release Model for Diesel Engines” SAE Paper 861272 1986
- Dec, J.D. “A Conceptual Model of Diesel Combustion Based on Laser-Sheet Imaging” SAE Paper 970873 1997
- Nakagome, K. Shimazaki, N. Niimura, K. Kobayashi, S. “Combustion and Emission Characteristics of Premixed Lean Diesel Combustion Engine” SAE Paper 970898 1997
- Benson, R.S. Whitehouse, N.D. “Internal Combustion Engines.” 1 2 Pergamon Press 1979
- Olsson K. Johansson, B. “Combustion Chambers for Natural Gas SI Engines. Part 2: Combustion and Emissions” SAE Paper 950517 1995
- Egnell, R. “Impact of Combustion Chamber Geometry on Charge Stratification in a CNG Fueled Direct Injection Otto Engine” ISRN LUTMDN/TMVK-7016-SE 1994 Department of Heat and Power Engineering Lund Institute of Technology
- Kobayashi, H. Kamimoto, T. Matsuoka, S. “Prediction of the Rate of Heat Release of a Axisymmetrical Diesel Flame in a Rapid Compression Machine” SAE Paper 840519 1984