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Effect of Flow and Gasoline Stratification on Combustion in a 4-Valve SI Engine
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Abstract
In a 4-valve SI engine, various levels of gasoline stratification and bulk flows were achieved by modifying the intake configuration and injection mode. Mean flow and turbulence were evaluated with Laser Doppler Velocimetry. Planar Laser Induced Fluorescence on a gasoline doped with a tracer was used to characterise the equivalence ratio field while the pressure traces were simultaneously acquired. Very positive effects of the elevation of tumble levels on combustion speed were observed. The possibility of stratifying the mixture was assessed. An excellent correlation was observed between local equivalence ratio, and early heat release and total burn duration. With highly stratified gasoline distributions, an improvement of combustion behaviour was obtained when ignition was in the richer region. By combining high tumble level and strong gasoline stratification, it was possible to improve remarkably initiation and propagation speeds while reducing cyclic variations, especially in the case of lean or very lean combustion.
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Authors
Citation
Deschamps, B., Snyder, R., and Baritaud, T., "Effect of Flow and Gasoline Stratification on Combustion in a 4-Valve SI Engine," SAE Technical Paper 941993, 1994, https://doi.org/10.4271/941993.Also In
References
- Baritaud, T.A. “Combustion and Fluid Dynamic Measurements in a Spark Ignition Engine: Effects of Thermochemistry and Velocity Fields; Turbulent Flame Speed SAE Paper 89098
- Henriot S. Le Coz J.F Pinchon P. “Three-Dimensional Modelling of Flow and Turbulence in a Four-Valve S.I. Engine - Comparison with LDV Measurements” SAE 890843 1989
- Le Coz J.F Henriot S. Pinchon P. “An Experimental and Computational Analysis of the Flow Field in a Four-Valve Spark Ignition Engine-Focus on Cycle-Resolved Turbulence” SAE 900056 February 26 March 2 1990
- Le Coz J.F. “Cycle-to-cycle Correlations Between Flow Field and Combustion Initiation in an S.I. Engine.” SAE 920517 Fevrier 1992
- Lebel, M. Cottereau, M.J. “Study of the effect of residual gaz fraction on combustion in a SI engine using simultaneous CARS measurements of temperature and CO2 concentration” SAE Paper 922388 1992
- Neij, H. Johannsson, B. Aldén, M. “Development and Demonstration of 2D-LIF for Studies of Mixture Preparation in SI Engines” 25th Symp. (Int.) on Combustion Irvine July 31st August 5th 1994
- Kiyota Y. Akishino T. Ando H “Concept of lean combustion by Barrel-stratification” SAE Paper 920678 1992
- Kuwahara K Watanabe T. Takemura J. Omori S. Kume T. Ando H. “Optimization of in-cylinder flow and mixing for a center-spark four valve leanburn engine employing the concept of barrel-stratification” SAE Paper 940986 1994
- Heinze T. Baritaud T “Development of Laser Induced Fluorescence (LIF) Method to Vizualize Gas Distribution in a S.I. Engine” 6th International Symposium on Applications of Laser Technology to Fluid Mechanics Lisbon July 20-23 1992
- Baritaud T. Heinze T. “Gasoline Distribution Measurements with PLIF in a SI Engine” SAE Paper 922355 1992
- Shimizu R. Matumoto S. Furuno S. Murayama M Kojima S. “Measurements of Air-Fuel Mixture Distribution in a gasoline Engine using LIEF Technique” SAE Paper 922356 1992
- Köhler J. Lawrenz W Meier F “Quantitative 2D LIF Measurements of Air/Fuel Ratios During the Intake Stroke in a Transparent SI Engine” SAE Paper 922320 1992
- Henriot, S. Herrier, D. Le Coz, J.F. “Développment d'un moteur 4-soupapes fonctionnant en mélange dilué” Revue de I'Institut Français du Pétrole 4 65 1991