MPI天然气发动机混合气形成过程的数值模拟  

Numerical simulation of mixture distribution for MPI natural gas engine

作　　者：孔祥安[1] 张素[1] 许伯彦[1] 

机构地区：[1]山东建筑工程学院机械电子工程系,山东济南250014

出　　处：《山东建筑工程学院学报》2004年第1期63-66,共4页Journal of Shandong Institute of Architecture and Engineering

基　　金：教育部留学归国博士基金;山东省自然科学基金(Y2000F07)资助项目

摘　　要：采用数值模拟方法,对渐缩形直进气道屋脊形燃烧室多点电喷(MPI)方式天然气发动机中混合气的形成过程进行解析,得到了天然气-空气混合气在气缸内的速度场、浓度场等。结果表明在纵向进气滚流作用下,压缩终了时,缸内混合气明显呈分层构造,在火花塞附近聚集较浓的可燃混合气,实现部分负荷工况下的稀薄燃烧。The process of mixture formation was analyzed with numerical simulation for a Multi-Point Injection (MPI)natural gas engine which has a gradual contracting straight inlet port and a pent-roof combustion chamber. The velocity field and concentration field of natural gas-air mixture in cylinder were gained. The results indicated that, at the end of compress stroke, the mixture in cylinder was stratified and richer ignitable mixture was concentrated around the spark plug under the action of the longitudinal intake vortex, thus lean burning at part load can be realized.

关 键 词：数值模拟 天然气 分层充气 屋脊形燃烧室 负荷 发动机 

分 类 号：TK434.6[动力工程及工程热物理—动力机械及工程]