摘要
在一台四气门光学汽油机上,应用激光粒子速度法(PIV)研究了单、双进气门工作时缸内横截面速度矢量场的变化规律,对其空间速度场的平均速度和湍流强度进行了统计分析.结果表明,双气门进气时,缸内不存在明显的大尺度涡流结构,平均速度和湍流强度基本保持稳定;单气门进气时,涡流运动显著加强,进气上止点后150° CA时,速度矢最图上出现明显的大尺度涡流结构,进气上止点后260°CA时大尺度涡流结构边缘出现尺度相对较小的涡旋,平均速度和湍流强度大大加强.
In a four-valve optical gasoline engine, particle image velocimetry （PIV）was used to measure swirling vector fields of cylinder cross section as engine worked at two intake valves and one intake valve two conditions. It analyzed the average velocity and tumble strength in spatial vector fields. The results show that there are no large scale vortex and aver age velocity and tumble strength keep stabilization at two intake valves condition;swirling motion intensify evidently at two intake valves condition. There is an obvious large scale vortex at 150 ℃A ATDC. There are small-scale vortexes on the edge of the large scale vortex at 260 ℃A ATDC. Average velocity and tumble strength intensify greatly.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2005年第6期520-523,共4页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50006008)国家重点基础研究发展规划(973)资助项目(2001CB209203).
关键词
汽油机
激光粒子速度法
速度矢量场
涡流
gasoline engine
particle image velocimetry
vector fields
swirling
作者简介
汪洋（1960-），男，教授，w．yang@eyou．com．
