不同掺氢比对甲醇发动机燃烧循环变动影响

Effect of Hydrogen Ratio on Cycle-by-Cycle Variations of Methanol Engine

基于一台改装的4缸氢-甲醇双燃料发动机,分别研究了1200 r/min及1800 r/min条件下不同掺氢比对甲醇发动机燃烧循环变动的影响。结果表明:当过量空气系数小于1.4时,掺氢对改善燃烧循环变动效果不明显,但6%的掺氢比优于3%;当过量空气系数大于1.4时,掺氢能够显著改善燃烧循环变动且较高的掺氢比效果更明显;当过量空气系数大于2.0时掺氢对抑制燃烧循环变动作用不明显。

Study of the effect of the different ratio of hydrogen on cycle-by-cycle variations base on a methanol-hydrogen engine during 1200 r/min and 1800 r/min,the research results show that adding hydrogen cannot improve the combustion obvious and ratio of 6%hydrogen is better than 3%when the excess air coefficient lower than 1.4;while it can improve the combustion obvious and the higher ratio the better when the excess air coefficient exceed 1.4;while it cannot restrain the cycle-by-cycle variation when the excess air coefficient large than 2.0.