予混合圧縮自己着火機関における天然ガス空気予混合気の燃焼実験および素反応数値解析(熱工学,内燃機関,動力など)

概要

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Homogeneous charge compression ignition (HCCI) combustion is regarded as next generation combustion method in terms of high thermal efficiency and low emissions. Natural gas is regarded as the most promising alternative fuel due to its clean burning and abundant supply. In this study, it was inventigated characteristics of autoignition and combustion of natural gas in an HCCI engine by using chemical reactions calculation and experimental study. And also, the operation conditions to realize combustion completion in an HCCI engine were suggested. The influences of n-butane blend ratio on autioignition and combustion was clarified in methane/n-butane/air mixtures. As a results of experiment and chemical reactions calculation, it becomes clear the following facts; i) Autoignition temperature of natural gas is in a range of 1 000±100 K without relations of equivalence ratios, intake temperatures and intake pressures, ii) To realize high thermal efficiency and low CO emissions, it is necessary to prepare operation conditions that maximum cycle temperature is over 1 500 K. iii) As blend ratios of n-butane are increased in Methane/n-butane/air mixtures, autoignition temperature and autoignition pressure become lower.
一般社団法人日本機械学会の論文
2003-05-25