四气门汽油机缸内滚流运动的LDA实验研究  

Studies on the LDA Measurements of In-Cylinder Tumble Motion in a 4-Valve Gasoline Engine

作　　者：王健[1] 林荣文[2] 刘德新[1] 刘书亮[1] 胡华[1] 许振忠[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]铁道科学研究院机车车辆研究所,北京100081

出　　处：《燃烧科学与技术》2004年第4期350-353,共4页Journal of Combustion Science and Technology

基　　金：国家自然科学基金重点资助项目 (599361 30 )

摘　　要：为了研究丰田 8A汽油机缸内气流运动状况 ,将一台Cagiva3 5 0单缸四气门汽油机重新设计改造成为与之相近的且可以进行激光诊断测试的试验样机 ,选取二氧化钛为示踪粒子 ,采用激光多普勒测速法 (LDA)研究了该样机在进气和压缩冲程缸内流场的变化情况 .研究结果发现 ,滚流在进气过程中就开始形成 ,并在实验所能实测的曲轴转角范围内一直保持 ,接近上止点时旋涡虽严重畸变 ,但仍未破碎为小尺度的湍流 .In order to study the air flow in Toyota 8A four-valve gasoline engines, a Cagiva350 single-cylinder, four-valve gasoline engine is selected as the sample engine, which is modified to an optical engine with lengthened cylinder and piston. Laser Doppler Anemometry (LDA) is used with TiO2 as tracing particles to measure the flow field in the cylinder in the intake and compression stroke. The results show that tumble flow is produced at the stage of induction, and continues to exist in the crankangle measured by the test. Although the tumble seriously attenuates near TDC, it doesn't distort and break up into small-scale vortexes.

关 键 词：四气门汽油机 滚流运动 激光多普勒测速法 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]