燃油系统参数对柴油机燃烧及排放影响的研究  

Influence of Fuel Injection System Parameters on Combustion and Emissions of a Diesel Engine

作　　者：赵昌普[1] 宋崇林[1] 李晓娟[1] 陈生齐[1] 孙强[1] 李艳丽[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机学报》2008年第6期505-512,共8页Transactions of Csice

基　　金：国家自然科学基金资助项目(50676067);中国博士后科学基金资助项目(20070420698);国家重点基础研究发展规划资助项目(2002CB211603)

摘　　要：采用CFD数值模拟方法研究了柴油机燃油喷射系统参数——喷孔直径、喷雾夹角等对柴油机燃烧过程及排放的影响。研究结果表明,喷孔直径对缸内速度场影响较大,较小的喷孔直径可以促进缸内充量的混合。喷孔直径越小,缸内高温区域出现越早,而且高温区域范围越大。随着喷孔直径的减少,碳烟排放降低,NOx排放升高。改变喷雾油束夹角对缸内压力和温度影响不大,但是影响到喷雾油束的落点位置。落点位置过高,则油束喷入气缸余隙较多,燃烧质量较差,生成较多碳烟;落点位置过低,则油束喷到燃烧室凹坑底部,导致油滴沉积在温度较低的燃烧室底面上,碳烟排放恶化。Parameters of fuel injection system significantly affect the combustion and emissions of diesel engines.In this paper,a multi-dimensional CFD numerical simulation method was introduced and effects of fuel injection system parameters,like nozzle hole diameter and spray angle,on combustion and emissions of a diesel engine were investigated.The simulated results showed that the diameter of nozzle hole had a significant effect on the engine in-cylinder velocity.Nozzle hole with small diameter could promote the ...

关 键 词：柴油机 排放 数值模拟 喷孔直径 喷雾夹角 

分 类 号：TK421.4[动力工程及工程热物理—动力机械及工程]