二行程汽油机分层扫气性能的数值模拟研究  

Numerical Study of Stratified Scavenging Performance of Two-Stroke Gasoline Engine

作　　者：文华[1] 刘永长[1] 魏明锐[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《车用发动机》2003年第6期25-28,共4页Vehicle Engine

摘　　要：简述了二行程汽油机常用的两种分层扫气方式(空间分层和时间分层)的工作原理,并采用计算流体力学(CFD)程序对其分别采用均匀扫气和这两种分层扫气方式时的换气过程进行了多维模拟计算。计算结果表明,与均匀扫气方式相比,分层扫气方式具有燃油短路损失小的优点,但对扫气性能没有明显的影响,且燃油的混合不如均匀扫气充分。This paper described the principle of two kinds of stratified scavenging method used in twostroke gasoline engine,namely spatial stratification and timely stratification.A CFD program was used to simulate the gas exchange process of three scavenge methods,uniform scavenging method and former two ones.The research results show that stratified scavenging process could reduce the fuel shortcircuiting loss,but hardly effect on scavenging performance,and fuelair mixture was not uniform,comparing with that of uniform scavenging method.

关 键 词：二行程汽油机 分层扫气 数值模拟 空间分层 时间分层 换气过程 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]