摘要
采用实验与计算流体动力学(CFD)数值计算相结合的方法,对一台高速四冲程进气道喷射(PFI)汽油机在全速全负荷工况下,不同喷油参数对混合气形成的影响进行了研究。研究结果表明:在高转速情况下,较多喷孔、较小喷孔直径能显著减少附壁油膜的生成,增大缸内燃空当量比;燃油喷射角对缸内当量比影响较大,喷射角较大时的当量比显著小于喷射角较小时的当量比,但是随着喷射角的减小,当量比也逐渐减小;半开阀喷射模式下附壁油膜量较少,缸内当量比大于闭阀喷射模式下缸内当量比;二次喷射相比于单次喷射,缸内当量比无明显差异。
The effects of different injection parameters on the mixture formation of a high-speed PFI gasolines were studied at full speed and full load conditions using the methods of combined with CFD numerical simulations and experiments. The results show that under the conditions of high speed, more nozzles and smaller nozzle diameter may significantly reduce the formation of the attached oil film and increase the equivalent ratio;The effects of fuel injection angle on equivalent ratio are remarkable, and the equivalent ratio of the larger injection angle is significantly lower than the smaller, and after injection angle reduced to a certain extent the equivalent ratio decreases with the decreasing of the injection angle;there is less attached oil film and larger equivalent ratio in semi-open injection mode compared with closed valve injection;Compared with the single injection, the equivalent ratio of split injection has no obvious differences.
作者
孙承
张毅
江武
杨靖
明阳
SUN Cheng;ZHANG Yi;JIANG Wu;YANG Jing;MING Yang(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha,410082;Hubei Sanjiang Aerospace Hongyang Electromechanical Co., Ltd.,Xiaogan,Hubei,432000)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2019年第15期1796-1803,1812,共9页
China Mechanical Engineering
基金
国家高技术研究发展计划(863计划)资助项目(2012AA111801)
关键词
计算流体动力学
高速汽油机
当量比
喷射角
进气道喷射
computational fluid dynamics(CFD)
high-speed gasoline engine
equivalent ratio
injection angle
port fuel injection(PFI)
