火花点火機関のサイクルごとの自己発火による燃焼率特性とノッキング強度について

概要

論文の詳細を見る
In this study the relationship between the amount of mixture fraction burned with autoignition and the timing of the onset of autoignition and knock intensity is investigated with a combination of high speed laser shadowgraphy and thermodynamic calculation. It is made clear that over 40 percent of the whole mixture burns with autoignition in a crank angle of less than 5 to 8 degrees when an engine is operated under the so called heavy knocking condition. This burn rate is about ten times higher than that of the combustion seen in a normally propagating flame. This abrupt heat release causes an oscillation in cylinder gases and results in a knocking sound. It is also clarified that the earlier the timing of the onset of autoignition, the more the amount of mixture fraction which burns with the autoignition is and the stronger the knock intensity of the corresponding cycle results in.
一般社団法人日本機械学会の論文
1986-08-25