二冲程自由活塞发动机扫气过程仿真分析  

Simulation and analysis of the scavenging process of two-stroke free piston engine

作　　者：马宗正 MA Zongzheng(College of Mechanical Engineering,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院机械工程学院,河南郑州451191

出　　处：《河南工程学院学报（自然科学版）》2024年第1期46-49,54,共5页Journal of Henan University of Engineering：Natural Science Edition

基　　金：河南省科技攻关项目(212102210332)。

摘　　要：点燃式二冲程自由活塞发动机扫气过程直接影响发动机的工作性能,故在建立分析模型的基础上,采用数值计算的方法对影响扫气过程的相关因素进行了分析。结果表明:采用外部供气方式适当提高进气压力可以有效提高扫气效率,增加缸内气体质量;当发动机转速存在波动时,较低转速有利于扫气过程的完成,但对缸内气体质量影响不大;当活塞行程小于设计值时,扫气效果变差,缸内气体质量明显下降。The scavenging process directly affects the working performance of the spark ignition two-stroke free piston engine.Therefore,based on the analysis model established,some influences of the scavenging process are analyzed by numerical simulation method.The results show that the scavenging efficiency and the gas quality in the cylinder can be effectively improved by using external air supply mode which can increase the inlet pressure.When the engine speed varies,the lower speed is beneficial to the completion of the scavenging process,but has little effect on the gas quality in the cylinder.Moreover,if the piston stroke value is less than the designed,the scavenging becomes worse,and the gas quality in the cylinder decreases significantly.

关 键 词：自由活塞发动机 二冲程发动机 扫气 

分 类 号：TK419[动力工程及工程热物理—动力机械及工程]