摘要
为了改善柴油机喷雾空间分布和缸内混合气形成质量,提出了一种双ω型燃烧室和与之相匹配的双排喷孔的燃烧系统。应用AVL FIRE软件对油束不同落点位置的缸内喷雾、混合气形成和燃烧过程进行了数值模拟,分析了油束不同落点位置对缸内速度场、浓度场和温度场和燃烧排放特性的影响。结果表明:油束落点位置对燃烧和排放性能影响较大,采用双排喷孔喷油嘴能有效提高可燃混合气的形成质量,而且碳烟排放最大值较采用单排喷孔时降低了57.8%。
To improve the spray spatial distribution and the mixture formation quality in diesel engines, a combustion system with a double-ω combustion chamber and a double-row orifice nozzle is proposed. A numerical simulation on its in-cylinder spray, mixture formation and combustion process with different positions of spray drop points is conducted by using AVL FIRE software, and the effects of different positions of spray points on the air velocity field and mixture concentration and temperature fields in combustion chamber as well as combustion and emission characteristics are analyzed. The results show that the position of spray drop point has a great influence on combustion and emission performance. Using the injector with double-row orifice nozzle can effectively improve the quality of combustible mixture formation with the highest level of soot emission reduces by 57. 8% compared with traditional injector with single row orifice nozzle.
出处
《汽车工程》
EI
CSCD
北大核心
2014年第4期426-431,458,共7页
Automotive Engineering
基金
国家自然科学基金(51106065)
江苏省高校自然科学基金(11KJB470006)资助
关键词
柴油机
双ω型燃烧室
油束落点
数值模拟
diesel engine
double-ω combustion chamber
spray drop point
numerical simulation
