摘要
通过可视化试验方法研究了进气流速对燃油喷雾的影响,结果表明进气流速增大时,可以有效促进燃油的空间挥发。数值分析结果表明,燃油落点位置改变时,进气流动对喷雾挥发的影响存在差异,对研究用机型而言,当燃油落点在进气门背面与进气道交界处时,会有更多的燃油在进气流动作用下直接进入气缸。当喷射距离增大时,油束前端面积增加,进气流动作用下,直接进入气缸的燃油量增多。高温的回流与油束作用能够促进喷雾的空间挥发。在进气门打开前喷射燃油时,油束碰壁反射后与进气流动相互作用,能够增加燃油的空间挥发量。
Visualization technique was adopted to study influence of intake air velocity on fuel injection. Results showed that evaporation of fuel could be promoted by increasing velocity of intake air. Influence of intake air on evaporation of spray was different if spray angle was changed. For the engine used in study, more fuel can enter cylinder directly if fuel was injected on the back of intake valve and inlet. With increasing distance of fuel injection, front end area of spray increased and more fuel would enter cylinder directly. Evaporation of spray can be promoted by high temperature back flow. Fuel injected before intake stroke would reflect against the inlet and intake valve, evaporation of reflected fuel could be promoted by intake air.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2013年第5期25-30,共6页
Transactions of the Chinese Society for Agricultural Machinery
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)
关键词
汽油机
进气冲程
挥发速率
影响因素
Gasoline engine
Intake stroke
Volatilization rate
Influence factor
