浅形缩口直喷式柴油机燃烧室结构特点及其对排放特性的影响  

Geometric characteristic of DI diesel engine shallow reentrant combustion chamber and its effect on emissions

作　　者：林学东[1] 丛春梅[2] 陈雪梅[1] 张多军[1] 朱二欣[1] 

机构地区：[1]吉林大学汽车工程学院,吉林长春130022 [2]吉林大学机电设备研究所,吉林长春130022

出　　处：《吉林大学学报（工学版）》2005年第1期18-23,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金资助项目(59676028).

摘　　要：利用AVL公司的FIRE软件对重型车用柴油机缩口直喷式燃烧室内的气体流动特性进行了数值模拟计算。引入涡流强度保持性的概念 ,计算分析了不同缩口直径对燃烧室内涡流强度保持性的影响。在此基础上 ,对不同缩口直径燃烧室进行了喷射系统参数的优化匹配试验研究。结果表明 :采用缩口直喷式燃烧室结构可有效组织燃烧室内的气流运动 ,并能与喷射系统参数进行优化匹配 。The flow field in the reentrant combustion chambers of automotive heavy-duty DI diesel engines were simulated by means of AVL FIRE software. In the analysis, the swirl intensity preservability was defined and the effects of combustion chamber reentrant diameter on the swirl intensity preservability were studied. Based on this, the optimizing tests for match between the fuel injection system and combustion chambers with different reentrant diameters were performed. Test results showed that the flow field in the diesel combustion chamber can be organized effectively by using reentrant geometry. Through optimized match between the fuel injection system parameters and geometric characteristics, the exhaust emissions from the diesel engine may be reduced obviously without penalty on engine power performance and fuel economy.

关 键 词：动力机械工程 缩口型燃烧室 涡流强度保持性 优化匹配 排放 

分 类 号：TK411.7[动力工程及工程热物理—动力机械及工程]