直喷式柴油机两段喷射计算模拟  

Numerical simulation of DI diesel engine with two stage split fuel injection

作　　者：郭晓平[1] 王占杰[2] 许锋[1] 

机构地区：[1]大连理工大学 动力系,辽宁大连116024 [2]大连理工大学 计算机系,辽宁大连116024

出　　处：《热科学与技术》2004年第4期343-347,共5页Journal of Thermal Science and Technology

基　　金：国家科技部973资助项目(2001CB209202)

摘　　要：以KIVA-3为计算平台,计算模拟4气门直喷式柴油机不同预喷油提前角的两段喷射燃烧历程。其结论是:150℃A BTDC以后的预喷提前角,其预喷与主喷柴油都以扩散燃烧为主;预喷柴油燃烧与缸内流动的共同作用,使缸内温度、质量分数分布更加复杂。氧质量分数分布差异是不同预喷油提前角对主喷燃烧放热率影响的主要因素。The combustion processes in the 4-valve DI diesel engine with different two stage split fuel injection were simulated using KIVA-3 computational platform. Results indicate that if the injection timing is less than 150℃A BTDC, the combustion mode of the pilot or main injection is mainly diffusion combustion. Under the joint influence of the pilot combustion and the gas flow, the temperature and mass distributions are very complex. The difference of oxygen density distribution is one of the main factors affecting the heat release rate of the main injection with different timing of pilot injection.

关 键 词：预喷 直喷式柴油机 喷油提前角 缸内流动 喷射燃烧 燃烧放热率 扩散燃烧 气门 计算模拟 共同作用 

分 类 号：TK421.42[动力工程及工程热物理—动力机械及工程] U464.136[机械工程—车辆工程]