喷孔分布对柴油机双ω燃烧系统性能影响的研究  

Research on Effect of Nozzle Hole Distribution on Performance of Combustion System with Double ω Combustion Chamber for Diesel Engine

作　　者：魏胜利[1] 王飞虎[1] 陈欢 冷先银[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]东风商用车技术中心,湖北武汉430056

出　　处：《兵工学报》2015年第1期33-39,共7页Acta Armamentarii

基　　金：国家自然科学基金项目(51106065);内燃机燃烧学国家重点实验室开放课题项目(k2013-7);江苏大学青年骨干教师培养工程项目(江大校[2011]277号)

摘　　要：为了改善柴油机喷雾空间分布,提高缸内混合气形成质量,提出了双ω型燃烧室及与之相匹配的双排喷孔的燃烧系统。应用AVL FIRE软件对不同喷孔分布形式的双ω型燃烧室缸内喷雾、混合气形成和燃烧过程进行数值模拟,分析了喷孔分布形式对缸内当量比分布和温度场及燃烧与排放特性的影响。研究结果表明:适当增加上排喷孔的数目能够有效提高混合气形成质量,改善燃烧过程;采用上排5个、下排3个的喷孔分布形式能够获得较低的氮氧化物和碳烟颗粒排放。A double to-combustion chamber matched with a double-row nozzle hole combustion system is proposed to improve the spray spatial distribution and the mixture formation quality for diesel engines. The in-cylinder spray, mixture formation and combustion process of the new combustion system are simu- lated and investigated by using AVL FIRE software. The effects of nozzle hole distribution on the fuel/air equivalence ratio, temperature field and emission characteristics in the chamber are analyzed by changing the spatial distribution of nozzle hole. The results show that the mixture formation quality can be effective- ly improved by increasing the number of nozzle holes in the upper row, and moreover, the combustion process can be improved. With the spatial distribution of 5 nozzle holes in the upper row and 3 nozzle holes in the lower row, NOx and Soot emissions can be reduced.

关 键 词：动力机械工程 柴油机 双ω型燃烧室 双排喷孔 数值模拟 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]