甲醇缸内直喷发动机分层燃烧和均质燃烧的试验研究  

Experimental Study on Stratified and Homogeneous Combustion of a Methanol Direct-Injection Spark-Ignition Engine

作　　者：李本正[1,2] 刘圣华[1] 农金吉[1] 宫艳峰[3] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]北京军区军械汽车技工训练大队,河北石家庄050081 [3]一汽集团技术中心发动机部性能开发室,吉林长春130011

出　　处：《内燃机学报》2009年第6期505-510,共6页Transactions of Csice

基　　金：国家"863"计划项目(2006AA11A1A4);国家自然科学基金资助项目(50876088)

摘　　要：在一台4缸柴油机改造的火花点火甲醇缸内直喷发动机上,中低负荷时采用分层燃烧来实现好的燃油经济性,高负荷时采用均质燃烧来获得好的动力性能。试验结果表明,甲醇缸内直喷发动机可以实现过量空气系数为2.23的分层稀薄燃烧;发动机的有效热效率最高可达35.3%,远高于普通汽油机;低速转矩大,动力性超过原机水平;在宽广的转速和负荷范围下平均指示压力的循环变动较小,燃烧稳定性好;该甲醇发动机可以实现NOc和碳烟的同时降低。In a methanol direct-injection spark-ignilion （DISI） engine retrofitted from a 4-cylinder diesel engine, the fuel needs to be injected into the cylinder near the end of compression stroke to realize the stratified combustion at partial loads for improving fuel economy. However, at high loads, the fuel needs to be injected into cylinder during intake stroke to realize the homogeneous combustion for achieving high power output. The results show that the methanol DISI engine can operate within the excessive air ratio of 2.23 and its maximum brake thermal efficiency reaches 35.3%. The methanol DISI engine exhibits higher power output than that of the original diesel engine. The cyclic variations of imep maintains low under a wide range of operating conditions, which shows a stable combustion. NOx and soot emissions can be decreased simultaneously.

关 键 词：缸内直喷 甲醇发动机 分层燃烧 均质燃烧 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]