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In-Cylinder Fuel Distribution, Flow Field, and Combustion Characteristics of a Mixture Injected SI Engine
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Abstract
In order to control the mixture formation, a mixture injected 4-valve SI engine was developed with a small mixture chamber and mechanically driven mixture injection valve installed into the cylinder head. The mixture injection valve was located at the center of the combustion chamber. The mixture was injected from the final stage of the intake stroke to the beginning of the compression stroke. The mixture distribution and in-cylinder flow field inside the combustion chamber were measured by a pair of laser two-dimensional visualization techniques. A planar-laser-induced exciplex fluorescence technique was used to visualize the in-cylinder mixture formation by obtaining spectrally separated fluorescence images of liquid and vapor phase fuel distribution. Particle image velocimetry (PIV) was used to obtain flow field images. In the case of the mixture injected SI engine, the mixture injected into the swirl center was retained during the compression stroke. A high concentration of fuel vapor still remained and was distributed near the center of combustion chamber until the final stage of compression stroke. The impinged fuel on the cylinder wall was decreased as compared with that of a conventional port injection. Combustion characteristics and engine performance of the mixture injected SI engine were also measured under various engine operating conditions, and the relationship of combustion stability and mixture distribution was discussed. The mixture injected SI engine had a high combustion rate and high combustion stability under lean operating conditions in comparison with homogeneous combustion of a conventional port injection engine. The limit air/fuel ratio could reach over 40. It was clear that the optimization of mixture distribution was very effective to increasing combustion stability under lean operating conditions.
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Tabata, M., Kataoka, M., Fujimoto, M., and Noh, Y., "In-Cylinder Fuel Distribution, Flow Field, and Combustion Characteristics of a Mixture Injected SI Engine," SAE Technical Paper 950104, 1995, https://doi.org/10.4271/950104.Also In
References
- Date T. Yagi S. “Research and development of the Honda CVCC Engine” SAE paper 740605 1974
- Kadota T. Zhao F. Q. Miyoshi K. “Rayleigh Scattering Measurements of Transient Fuel Vapor Concentration in a Motored Spark Ignition Engine” SAE Paper 900481 1990
- Zhao F. Q. Taketomo T. Nishida K. Hiroyasu H. “Two Dimensional Measurements of the Fuel Vapor Concentration in the Combustion Chamber of a SI Engine with Laser Rayleigh Scattering” SAE Paper 922389 1992
- Tabata M. Nagao A. Iida Y. “Studies of Fuel Droplets Behavior and Flame Propagation in Combustion Chamber on S.I. Engine Using Laser 2-D Visualization” 179 184 COMODIA 90 1990
- Bardsley M. E. A. Felton P.G Bracco F. V. “2-D Visualization of Liquid and Vapor Fuel in an I.C. Engine” SAE Paper 880521 1988
- Bardsley M. E. A. Felton P. G. Bracco F. V. “2-D Visualization of a Hollow-Cone Spray in a Cup-in-Head, Ported, I.C. Engine” SAE Paper 890315 1989
- Fujimoto M. Tabata M. “Effect of Swirl Rate on Mixture Formation in a Spark Ignition Engine Based on Laser 2-D Visualization Techniques” SAE Paper 931905 1993
- Shack D. H. Reynolds W. C. “Application of Particle Tracking Velocimetry to the Cyclic Variability of the Pre-Combustion Flow Field in a Motored Axisymmetric Engine” SAE Paper 910475 1991
- Khalighi B. “Intake-Generated Swirl and Tumble Motions in a 4-Valve Engine with Various Intake Configurations -Flow Visualization and Particle Tracking Velocimetry” SAE Paper 900059 1990
- Reuss D. L. Adrian R. J. Landreth C. C. French D. T. Fansler T. D. “Instantaneous Planer Measurements of Velocity and Large-Scale Vorticity and Strain Rate in an Engine Using Particle Image Velocimetry” SAE Paper 890618 1989
- Kudou H. Yamamoto H. Iida Y. “A Study About In-Cylinder Flow and Combustion in a 4-Valve S.I. Engine” SAE Paper 920574 1992
- Melton L. A. “Spectrally Separated Fluorescence Emissions for Diesel Fuel Droplets and Vapor” Applied Optics 22 2224 2226 1983
- Melton L. A. Verdieck J. F. “Vapor/Liquid Visualization in Fuel Sprays” Twentieth Symposium on Combustion 1283 1290 1994
- Tabaczynski R. J. Klomp E. D. “Calculated Nitric Oxide Emissions of Unthrottled Spark Ignition, Stratified Charge Internal Combustion Engine” SAE Paper 741171 1974