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Analysis of Heat Quantity in CNG Direct Injection Bomb(1) : Homogeneous Charge  

최승환 (부산대학교 기계공학과)
전충환 (부산대학교 기계공학부, 기계기술연구소)
장영준 (부산대학교 기계공학부, 기계기술연구소)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.12, no.2, 2004 , pp. 17-23 More about this Journal
Abstract
A cylindrical constant volume combustion bomb is used to investigate the combustion characteristics and to analyze the heat quantity of homogeneous charge methane-air mixture under various initial pressures, excess air ratios and ignition times. As the overall pressure increase, the values of maximum combustion pressure, maximum heat release rate and cumulative heat release have been increased. But it is not very meaningful to compare with some values such as maximum combustion pressure, maximum heat release rate and cumulative heat release for different overall pressure due to the different heat energy of supplied fuel. So the each value is needed to be compared with normalized value, which is divided by the entered fuel energy. To analyze the heat quantity, some definitions including the CHR ratio, the UHC ratio and the HL ratio are needed and are calculated. As the overall pressure increase, the CHR ratios and the UHC ratios have been decreased, while the HL ratios have been increased. The CHR ratio of 300 ms has the higher value than that of 10000ms, and the HL ratios of 300 ms have a lower value.
Keywords
Unburned hydrocarbon ratio; Heat loss ratio; Constant-volume combustion bomb; Homogeneous charge; Rate of heat release; Analysis of heat quantity; CHR ratio(Cumulative heat release ratio); UHC ratio(Unburned hydrocarbon ratio); HL ratio(Heat loss ratio);
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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