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Analysis of Intermediate Combustion Products in Preflame Reactions in a Spark-Ignition Engine
Technical Paper
978516
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English
Abstract
The use of a higher compression ratio is desirable for improving the thermal efficiency and specific power of spark-ignition engines, but it gives rise to a problem of engine knock. In the present research, an investigation was made of the role of the preflame reaction region of a spark-ignition engine in the occurrence of autoignition. Emission spectroscopy was used to measure the behavior of formaldehyde (HCHO) in a cool flame. In addition, measure the behavior of the faint light attributed to the HCO radical in a blue flame with the concurrent measurement of the OH radical.
The emission waveforms measurements obtained for HCHO when n-heptane (ORON) was used as the fuel, It is thought that these tendencies correspond to the passage and degeneracy of a cool flame. Further, the emission waveforms measured for the HCO radical when blended fuels (6ORON, 8ORON) were correspond to that of a blue flame.
Authors
Citation
Matsushima, T., Yoshida, K., Shoji, H., and Saima, A., "Analysis of Intermediate Combustion Products in Preflame Reactions in a Spark-Ignition Engine," SAE Technical Paper 978516, 1997.Also In
References
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- Lepperd , W. R. The Chemical Origin of Fuel Octane Sensitivity SAE Paper 902137 1990
- Itoh , T. et al. Emission Characteristics of OH and C 2 with Knocking Trans. JSME 59 562B 310 1993
- Shoji , H. et al. Spectroscopic Measurement of Radical Behavior Under Knocking Operation SAE Paper 962104 1996
- Komatsu , K. et al. Onset Behavior of Low-Temperature Autoignition Caused by Piston Compression Pre-print of the 10 th Internal Combustion Engine Symposium 265 1992
- Gaydon , A. G. The spectroscopy of Flames Chapman & Hall Ltd. London 1957