液化石油气发动机燃油喷射过程的数值模拟及其试验研究  

Experimental and Numerical Study of LPG Fuel Injection Process in Direct Injection Diesel Engine

作　　者：郑瑞[1] 张煜盛 田威[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《内燃机工程》2006年第5期1-5,共5页Chinese Internal Combustion Engine Engineering

基　　金：高等学校博士学科点专项基金资助项目(20020487022);国家重基础研究发展规划项目(2001CB209207)

摘　　要：针对采用普通泵-管-嘴燃油系统的液化石油气(LPG)直喷式发动机,建立了考虑高压油泵柱塞偶件燃油泄漏量影响的燃油系统数学模型,并对燃油喷射过程进行了模拟计算及其计算结果的试验验证,揭示了LPG发动机燃油喷射过程的基本规律与工作特征。研究表明:由于LPG具有较高的饱和蒸汽压和可压缩性,致使其压力上升和下降都比较缓慢,供油持续期加长,油管内燃油残余压力较高,压力波动较大,容易发生二次喷射;通过增大出油阀卸载容积的办法,可以消除LPG的二次喷射等异常喷射现象。This paper presented an experimental and computational study of the hydraulic phenomena and the dynamics of conventional pump-pipe-injector fuel supply system in a direct injection diesel engine operated with liquefied petroleum gas （LPG）. The effect of the fuel leakage from the fuel pump and injector on the LPG supply process was taken into account. The simulation and experiment results show that in comparison with the conventional diesel fuel, retarded start of fuel injection, longer fuel injection duration, higher residual pressure and secondary injection phenomena for LPG are observed as a result of the higher compressibility and higher vapor pressure. The secondary injection phenomena are observed for LPG fuel injection and those can be controlled by increasing the relief volume of the delivery valve.

关 键 词：内燃机 柴油机 液化石油气 燃油喷射 数值模拟 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]