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The Effects of Charge Dilution on Combustion and Its Improvement-Flame Photograph Study
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Abstract
The adverse effects of charge dilution on combustion of spark ignition engines are well known; as a tool for reduction of nitrogen oxide emission, it becomes important.
Some methods of analyzing combustion phenomena in a single-cylinder engine (27.1 CID) with charge dilution were tried. Multiple ionization probes roughly indicate the pattern of flame propagation, but details of the flame, especially charge dilution, cannot be measured by this method. Flame photographs, on the other hand, showed clearly the effects of combustion chamber design on flame propagation and its cyclic dispersion. The effects of combustion chamber configuration, ignition energy and spark duration, ignition timing, composition of diluent gas, air-fuel ratio, and mixture homogeneity were examined. Mass burnt fraction was calculated from both flame photographs and pressure indicator diagrams.
A combustion chamber having high turbulence and a rich air-fuel ratio promoted the initial flame propagation and flame speed and improved cyclic dispersion.
For high turbulence design, the combustion chamber of the commercial 97.5 CID, 4-cyl engine was modified. Fluctuation of output torque was measured and analyzed by correlation and probability analyses. This analysis indicated that high turbulence design was effective for improvement of car surge caused by EGR, and this was confirmed by actual driving on the road.
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Nakanishi, K., Hirano, T., Inoue, T., and Ohigashi, S., "The Effects of Charge Dilution on Combustion and Its Improvement-Flame Photograph Study," SAE Technical Paper 750054, 1975, https://doi.org/10.4271/750054.Also In
References
- Everett R. L. “Measuring Vehicle Driveability.” Paper 710137 SAE Automotive Engineering Congress Detroit January 1971
- Gumbleton J. J. Bolton R. A. Lang H. W. “Optimizing Engine Parameters with Exhaust Gas Recirculation.” Paper 740104 SAE Automotive Engineering Congress Detroit February 1974
- Patterson D. J. “Cylinder Pressure Variations, A Fundamental Combustion Problem.” SAE Transactions 75 1966 paper 660129
- Cole D. E. Mirsky William “Mixture Motion-Its Effect on Pressure Rise in a Combustion Bomb: A New Look at Cyclic Variation.” SAE Transactions 77 1968 paper 680766
- Barton R. K. Lestz S. S. Meyer W. E. “An Emprical Model for Correlating Cycle-by-Cycle Cylinder Gas Motion and Combustion Variations of a Spark Ignition Engine.” SAE Transactions 80 1971 paper 710163
- Anderson W. T. Lestz S. S. Meyer W. E. “The Effect of Charge Dilution on CBC Variations and Exhaust Emissions of an SI Engine.” Paper 730152 SAE Automotive Engineering Congress Detroit January 1973
- Schnauffer K. “Engine-Cylinder Flame-Propagation studied by New Methods.” SAE Journal 34 1
- Curry S. “A Three-Dimensional Study of Flame Propagation in a Spark Ignition Engine” SAE Transactions 71 1963 paper 452B
- Scott W. M. “Looking in on Diesel Combustion.” SP-345 New York Society of Automotive Engineers 1968 paper 690002
- Withrow L. Rassweiler G. M. “Slow Motion shows Knocking and Non-Knocking Explosions.” SAE Journal 39 2
- Rassweiler G. M. Withrow L. “Motion Pictures of Engine Flames correlated with Pressure Cards.” SAE Journal 42 5
- Ohigashi S. Hamamoto Y. Tanabe S. “A New Digital Method for Measuring Gas Flow Velocity by Electric Discharge.” Paper 690180 SAE International Automotive Engineering Congress Detroit January 1969
- Khitrin L. N. et al. “Combustion in Turbulent Flow.” Jerusalem Israel Program for Scientific Translations 1963
- Mellish C. E. Linnett J. W. “The Influence of Inert Gases on Some Flame Phenomena.” Fourth Symposium on Combustion September 1952 407 420