新型缸内直喷发动机滚流燃烧室设计与研究  

Design and Research on New Gasoline Direct Injection Engine Tumble Combustion Chamber

作　　者：卢勇[1,2] 裴普成[1,2] 晁鹏翔[1,2] 

机构地区：[1]清华大学汽车工程系,北京100084 [2]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《西安交通大学学报》2012年第11期17-22,共6页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51176082)

摘　　要：为了获得更加节能、环保和高性能的汽油发动机,设计了一种适用于缸内直喷(GDI)发动机的新型滚流燃烧室,并将这种燃烧室应用于4G15缸内直喷发动机进行了实验研究.该燃烧室通过活塞顶上凸起面的作用,合理地组织了缸内气体流动.计算流体动力学(CFD)仿真分析表明,在不使用垂直向下滚流进气道的情况下,该燃烧室同样可以获得理想的滚流强度.实验结果表明,4G15发动机的稀燃极限可达25～27,其中17～19是效率最高的空燃比区间,该区间的效率较原机提高了10%左右.在理论空燃比的情况下,当废气再循环率(EGR)达到7%时,NOx排放的化学计量可以降低到无EGR情况的20%以下.In order to obtain gasoline engines with high efficiency,low-emission and high performance,a new gasoline direct injection（GDI） engine tumble combustion chamber was designed,and an experiment was conducted with the present combustion chamber on a 4G15 GDI engine.This tumble combustion chamber organizes the in-cylinder flow rationally by optimizing the shape of piston crown.The result of computational fluid dynamics（CFD） analysis indicates that the combustion chamber structure could result in perfect in-cylinder tumble intensity,even without the vertical straight intake port.The test results show that the lean combustion limit of the 4G15 GDI engine can reach 25-27.The most efficient air-fuel ratio range is 17-19 and in this range,and the engine fuel consumption decreases by 10% compared with the original engine.In the case of stoichiometric ratio,NOx emission decreases to less than 20% of that without EGR when the exhaust gas recirculation（EGR） is 7%.

关 键 词：燃烧室 缸内直喷发动机 滚流 稀燃 废气再循环 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]