二冲程汽油机扫气过程多维数值模拟  

Simulation Model for a Loop Scavenged Two Stroke Engine

作　　者：刘兵[1] 杨迪[1] 

机构地区：[1]西安交通大学

出　　处：《西安交通大学学报》1999年第1期69-72,101,共5页Journal of Xi'an Jiaotong University

基　　金：国家攀登计划资助

摘　　要：为揭示二冲程汽油机扫气过程的特点，对倒拖工况下二冲程汽油机的气缸、扫气道和排气道内的流场进行了多维数值模拟．计算结果与实验结果表明，曲轴箱与排气道之间的压差对扫气道的流速有决定性的影响．计算发现，在扫气过程中出现双环涡和滚涡。Calculations are made to analyze the flow field for the engine cylinder, transfer pipes and eshaust pipe of a loop scavenged engine. Result shows the pressure difference between the crank case and the exhaust pipe has a definite influence on the flow field of the transfer pipe. A pair of toroidal vortex and tumble vortex are found in the cylinder during the scavenging process. And the tumble vortex is maintained up to the nearly top dead center.

关 键 词：流场模拟 二冲程内燃机 扫气 汽油机 数值模拟 

分 类 号：TK411.3[动力工程及工程热物理—动力机械及工程]