摘要
采用高速相机对同轴对称撞击流中颗粒运动行为进行了实验研究,采用图像处理软件对获得的图片进行分析处理,得到了颗粒在同轴对称撞击流中的运动轨迹、运动速度、最大渗入距离和旋转速度等参数。考察了喷嘴出口气速、颗粒大小、颗粒出口速度以及喷嘴间距对颗粒运动行为的影响。结果表明:颗粒在同轴对称撞击流中的运动有直接射出模式和振荡模式,其中振荡模式占70%;出口气速的增加使颗粒轴线速度和旋转速度变大;随着颗粒相对出口速度、颗粒Stokes数和喷嘴间距的增加,颗粒的最大渗入距离变大。
The motion behavior of particles in coaxial opposed the parameters of the particles such as trajectory, velocity, jets was experimentally studied and maximum penetration distance and rotation speed in opposed jets were obtained by analyzing the pictures of the motion behavior of particles photographed by high speed camera. The effects of exit air velocity, particle diameter and exit particle velocity on motion behavior of particles were investigated. The results showed that there were two models, direct escape model and oscillate model, for motion behavior of particles in turbulence opposed jets. The oscillate model was about 70% in total. With the increasing of the exit air velocity, both the axial particle velocity and the rotation speed increased. With the increasing of the normalized exit particle velocity, the Stokes number of the particle and the distance between normalized nozzles, the maximum penetration distance increased.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2009年第2期97-103,共7页
Chemical Reaction Engineering and Technology
基金
国家重点基础研究发展规划资助项目(2004CB217703)
教育部长江学者与创新团队发展计划(IRT0620)
关键词
颗粒
撞击流
高速相机
马格努斯力
single particle
opposed jets
high speed camera
Magnus force
