两喷嘴对置撞击流驻点偏移规律  

Stagnation point offset of two opposed jets

作　　者：李伟锋[1] 孙志刚[1] 刘海峰 王辅臣[1] 于遵宏[1] 

机构地区：[1]华东理工大学资源与环境工程学院煤气化教育部重点实验室,上海200237

出　　处：《化工学报》2008年第1期46-52,共7页CIESC Journal

基　　金：教育部新世纪人才支持计划项目(NCET-05-0413);国家重点基础研究发展计划项目(2004CB217703)~~

摘　　要：运用烟线法和热线风速仪对两喷嘴撞击流流场进行了实验研究,考察了不同喷嘴间距、不同气速比下撞击面的稳定性和撞击面驻点的偏移规律。结果发现,当2D≤L≤4D(L为喷嘴间距,D为喷嘴直径)时,若两喷嘴气速相等,撞击面不稳定,在轴线上发生振荡;当两喷嘴气速有小的差异时,撞击面驻点将发生大幅度的偏移,此时流场变得相对比较稳定。当2D≤L≤8D时,撞击面驻点位置对气速比变化很敏感;当L<2D和L>8D时,撞击面驻点位置对两喷嘴气速比的变化逐渐变得不敏感。The flow field of two opposed jets was experimentally investigated with the smoke-wire technique and hot-wire anemometer for the stability of impingement plane and stagnation point offset at various nozzle separations and exit velocity ratios. The results showed that at 2D≤L≤4D （where L is nozzle separation and D is nozzle diameter）, the impingement plane was instable and oscillated at equal exit velocities, while the impingement plane deviated from the mid-point to a large extent and the flow field became stable comparatively at a small difference of exit velocities. At 2D≤L≤8D, the stagnation position was very sensitive to the change of velocity ratio; while at L〈2D or L〉8D, the position of stagnation point became insensitive to the change of exit velocity ratio.

关 键 词：撞击流 驻点偏移 稳定性 烟线法 热线风速仪 

分 类 号：TQ021.1[化学工程] O358[理学—流体力学]