油束热碰壁制备柴油均质预混合气的优化  

Optimization of premixed diesel homogeneous charge preparation by spray hot-impingement

作　　者：胡宗杰[1] 吴志军[2] 高光海[1] 李理光[2] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200030 [2]同济大学汽车学院,上海201804

出　　处：《吉林大学学报（工学版）》2007年第1期79-84,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：'973'国家重点基础研究发展规划项目(2001CB209201)

摘　　要：设计了5种进气道热碰壁制备柴油均质预混合气的油嘴方案,根据燃油吸入比例、NOx排放和排气不透光度,对喷孔数量、油束着壁入射角度α(油束轴线与壁面法线的夹角)进行了优化研究。结果表明,当α=15°时,喷孔数量增加会使高壁面温度时排气不透光度降低,但不能有效提高燃油吸入比例,而当α=45°时,喷孔数量增加对排气不透光度影响很小,却有利于提高燃油吸入比例。对不同的α,喷孔数量增加都会减少NOx排放。随α减小,燃油吸入比例逐渐升高,但从NOx排放和排气不透光度分析,存在最佳α值。综合分析认为,对本文试验组,喷孔数量选择6个,α选择30°为最佳方案。Based on the sucked fuel ratio, NOx emission and exhaust opacity, the nozzle hole number and the angle of incidence （the angle between the nozzle hole axis and the wall normal） α were optimized through comparison of 5 kinds of nozzles for premixed diesel homogeneous charge preparation by spray hotdmpingement at intake manifold. Results show that, if α= 15°, to increase the hole number would reduce the exhaust opacity, but could not effectively increase the sucked fuel ratio： But when α= 15°, to increase the hole number would effectively increase the sucked fuel ratio, whereas could not reduce the exhaust opacity. The NOx emission would decrease when hole number increased. If a decreased, the sucked fuel ratio could be enhanced. There is a best a for NOx emission and exhaust Opacity. For the 5 nozzles, the nozzle with 6 holes and α= 30° is the optimized case.

关 键 词：动力机械工程 热碰壁 喷孔数量 着壁入射角度 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]