小型汽油机热效率提升技术研究  

Research on Improving Thermal Efficiency of Small Gasoline Engine

作　　者：姜钰 Jiang Yu(Tongji University Automotive Institute,Shanghai 201804)

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《内燃机与配件》2022年第7期1-5,共5页Internal Combustion Engine & Parts

摘　　要：本文论述了小型汽油机热效率现状,分析提升热效率的实施方向,工程技术手段以及应用进展。根据发动机热效率的基本公式,提出热效率提升的两个路径,一是优化燃烧和气体交换系统,提高压缩比,降低泵气损失,提升循环的理论热效率,如提高冲程缸径比,Atkinson/Miller循环,EGR/稀薄燃烧等;二是降低发动机传热/冷却损失,并提升机械效率。This article discusses the current status of thermal efficiency of small gasoline engines,analyzes the implementation direction of improving thermal efficiency,engineering techniques and application progress.According to the basic formula of engine thermal efficiency,two ways to improve thermal efficiency are proposed.One is to optimize the combustion and gas exchange system,increase the compression ratio,reduce the pumping loss,and improve the theoretical thermal efficiency of the cycle,such as increasing the stroke/bore ratio,Atkinson/Miller cycle,EGR/lean burn,etc.;the second is to reduce engine heat transfer/cooling loss and improve mechanical efficiency.

关 键 词：汽油机 热效率 压缩比 机械效率 

分 类 号：TK419.1[动力工程及工程热物理—动力机械及工程]