作　　者： ; ; ; ; ;

机构地区： 河南科技大学车辆与动力工程学院

出　　处： 《内燃机工程》 2010年第1期38-42,共5页

摘　　要： 在单缸直喷式柴油机上,研究了燃用柴油和柴油/丙烷混合燃料时,空燃比对发动机燃烧和排放特性的影响。结果表明:发动机转速一定时,燃烧持续期随空燃比和丙烷比例的增加而缩短;缸内最高燃烧压力随空燃比的增大而减小,随丙烷比例的增加而增大;NOx和碳烟排放随空燃比的增大而降低,HC排放在小空燃比时随空燃比的减小而大幅度增加,而在大空燃比时随空燃比的增大而稍有增加;在小空燃比时CO排放随空燃比的减小而增加,在大空燃比时变化不大;燃用柴油/丙烷混合燃料可同时降低CO、HC和碳烟排放,但NOx排放增加。 The effects of air-fuel ratio on the combustion and emissions of a single-cylinder direct injection diesel engine fueled with diesel fuel and diesel/propane blends were investigated. The results show that the combustion duration decreases with the increase of air-fuel ratio and propane proportion; the peak cylinder pressure decreases with the increase of air-fuel ratio and increases with the increase of propane proportion, NOx and smoke emissions decrease with the increase of air-fuel ratio, HC emission increases greatly with the decrease of air-fuel ratio at smaller air-fuel ratio, while it increases with the increase of air-fuel ratio at larger air-fuel ratio; CO emission increases with the decrease of air-fuel ratio at smaller air-fuel ratio, and it almost keeps constant at＇larger air-fuel ratio; CO, HC and smoke emissions can be reduced simultaneously, but NOx emission increases when the engine is fueled with diesel/propane blend.

关 键 词： 内燃机 空燃比 柴油 丙烷混合燃料 发动机 燃烧 排放

领　　域： [动力工程及工程热物理]