进气回流对PFI汽油机燃油挥发量影响的计算分析  

Effects of Intake Back-Flow on Fuel Evaporation for Mass PFI Gasoline Engine

作　　者：马宗正[1,2] 程勇[1] 纪少波[1] 杨永广[1] 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]河南工程学院机械系,郑州451191

出　　处：《燃烧科学与技术》2012年第1期67-72,共6页Journal of Combustion Science and Technology

基　　金：教育部留学回国人员科研启动基金资助项目;天津大学内燃机燃烧学国家重点实验室开放基金资助项目(SKLE200908)

摘　　要：建立了进气道喷射式汽油机模型,采用数值计算的方法研究了进气回流对燃油挥发量的影响.结果表明,采用闭阀喷射模式时,气缸内部高温燃气的回流使得附壁油膜表面能够得到更多的热量,有利于提高附壁油膜挥发量;采用开阀喷射模式时,气缸内部的高温燃气的回流与喷雾相互作用,促进了燃油的空间挥发,燃油空间挥发油量增大.Based on the validation of the simulation model for intake-port fuel injection engine （PFI）, the effect of back-flow on fuel evaporation mass is studied by numerical simulation method. The results show that for closed valve injection （CVI）, the back-flow of hot gas from the cylinder is helpful to wall-film evaporation because wall-film can get more energy for evaporation. For open valve injection （OVI）, the back-flow of hot gas can interact with fuel spray, which is advantageous for fuel space evaporation, and with fuel space evaporation and wall-film evaporation considered together, back-flow can increase fuel evaporation mass.

关 键 词：汽油机 进气回流 数值计算 燃油挥发量 

分 类 号：TK411.29[动力工程及工程热物理—动力机械及工程]