柴油机掺烧气体燃料对充气效率和过量空气系数的影响

Influence of Blending Gas Fuels to Air-charged Efficiency and Over-air Coefficient in Diesel Engine

采用理论分析和实验测量的方法研究了预混合方式掺烧气体燃料对柴油机充气效率■ｃ和过量空气系数■ａ的影响．推导出了两个可以预测■ｃ和■ａ之影响的计算公式，实验测量了柴油机掺烧前后的油耗、排温和过量空气系数．理论分析和实验结果表明：掺烧液化石油气（ＬＰＧ）对■ｃ和■ａ几乎没有影响，掺烧压缩天然气（ＬＰＧ）对■ｃ和■ａ稍有影响．

In this paper, the influence of blending gas fuels to the air-charged efficiency(■c) and over-air co- efficient (■a) in Diesel engine has been studied by means of the theoretical analysis and the experiment. Two formulas have been introduced,by which it will be able to predict the effects to ■c and ■a by blending gas fuels in Diesel engine. The fuel consumption,exhausted gas temperature and ta have been measured in the experiment. The theoretical analysis and the experiment results suggest that there is no effect to ■c and ■a by blending LPG and limited effects to ■c and ■a by blending CNG.