航空活塞二冲程发动机排气结构对换气过程的影响研究  

Study on The Effect of Two-stroke Engine Exhaust Resonance on Ventilation of Aero-piston

作　　者：刘瑞芬 董雪飞 刘颖 LIU Ruifen;DONG Xuefei;LIU Ying(Shanxi Vocational College of Engineering,Taiyuan 030027,China;Beijing Aerospace Time Feihong Technology Co.,Ltd.,Beijing 100094,China)

机构地区：[1]山西工程职业学院,山西太原030027 [2]航天时代飞鸿技术股份有限公司,北京100094

出　　处：《内燃机》2024年第4期38-45,共8页Internal Combustion Engines

基　　金：2023年度山西省高等学校科技创新计划(2023L557)。

摘　　要：为了解决航空活塞二冲程发动机排气系统对发动机性能及换气效率的影响问题,基于GT-Power的一维流动仿真对比研究了航空活塞二冲程发动机直排、直排-渐扩和渐扩-渐缩三种形式排气系统谐振状态对发动机性能及换气效率的影响。结果表明,三种不同排气系统谐振状态对发动机换气效率的影响非常明显。相比直排管和直排-渐扩形式,采用渐扩-渐缩形式的发动机在高转速和中低转速均呈现出较好性能。合理的排气谐振通过提高背压达到提高捕获率及优化扫气效率的效果,进而影响发动机的油耗和性能。This article compares the effects of three types of exhaust system resonance states on engine performance and ventilation effi-ciency of an aviation piston two-stroke engine,namely direct exhaust,direct exhaust gradually expanding,and gradually expanding gradually contracting,based on one-dimensional flow simulation of GT Power.The results indicate that three different exhaust system resonance states have a significant impact on the engine ventilation efficiency;Compared to the straight exhaust and straight exhaust gradually expanding forms,engines using gradually expanding gradually contracting forms exhibit better performance at high and medi-um low speeds;Reasonable exhaust resonance improves the trapping ratio and scavenging efficiency by increasing the average back pressure,thereby affecting the fuel consumption and performance of the engine.

关 键 词：航空活塞二冲程发动机 排气谐振 扫气效率 捕获率 

分 类 号：TK427[动力工程及工程热物理—动力机械及工程]