柴油机准均质混合气形成的数值模拟  

Numerical Simulation on Quasi-Homogeneous Mixture Formation in Diesel Engines

作　　者：李孝禄[1] 黄震[1] 方俊华[1] 宋军[1] 乔信起[1] 

机构地区：[1]上海交通大学,上海200030

出　　处：《汽车工程》2005年第5期528-530,582,共4页Automotive Engineering

基　　金：国家重点基础研究发展规划项目(2001CB209208);国家自然科学基金项目(50276035)资助。

摘　　要：利用KIVA-3V模拟了一台单缸二冲程柴油机通过早喷形成准均质混合气的过程,分析了喷嘴的不同结构对缸内混合气浓度场和温度场的影响。模拟计算表明,利用早喷可以形成稀薄准均质混合气;燃烧室形状影响混合气浓度场和温度场。为使稀薄准均质混合气在缸内合理分布,在不改变活塞ω形状的条件下,使用单孔喷嘴能有效避免燃油碰壁的发生。Using software KIVA-3V, a simulation on the process of quasi-homogeneous mixture formation by means of early injection in a single-cylinder two-stroke diesel engine with to shaped combustion chamber is conducted. The effects of different structures of nozzle on the density and temperature fields of in-cylinder mixture are analyzed. The results show that the lean quasi-homogeneous mixtures can be formed by early-injection, and the shape of combustion chamber has an obvious effect on density and temperature fields of mixture. With to shaped combustion chamber, using single-orifice nozzle can effectively avoid the fuel spray impinging on the wall, resulting in a more rational distribution of lean quasi-homogeneous mixtures in the chamber.

关 键 词：柴油机 准均质混合气 数值模拟 二冲程柴油机 混合气形成 燃烧室形状 合理分布 温度场 浓度场 计算表 

分 类 号：TK42[动力工程及工程热物理—动力机械及工程]