钝体冷态流场的PIV实验研究  

The PIV experimental investigation on cold-state wake behind bluff-body

作　　者：钱壬章[1] 邹怀宇[1] 张孝春[2] 尚守堂[2] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]沈阳发动机设计研究所,辽宁沈阳110015

出　　处：《华中科技大学学报（自然科学版）》2005年第11期48-50,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：航空科学基金资助项目(02C06003)

摘　　要：运用PIV技术在风洞中分别对5种不同形式的钝体:标准钝体、三角形钝体、流线形钝体、带通道钝体及非流线形钝体在冷态工作环境、不同缝宽下,获取了钝体后的速度分布.对比了5种不同钝体在不同缝宽下回流区长度的变化,认为随开度增大,在回流区结构不遭到破坏的前提下,回流区长度加大.同等条件下,非流线形钝体有最大的回流区长度;通过对尾迹区域的平均湍流动能的分析,认为平均湍流动能的强度随缝开度加大开始减弱,湍流强度最大的区域逐渐后移,最终往回流区的上下边界发展.通过对钝体后的尾迹结构和流动特性进行分析,为热态实验奠定了基础.A method of PIV technology was applied to measure the velocimetry field behind five kinds of bluff-bodies, including means standard-type bluff-body; tri-angle-type ; streamline-type ; tunnel-type and non-streamline type, in wind tunnel-type ones under cold state by changing their gaps, and the lengths of recirculating-zone of these bluff-bodies with different gaps were compared. It was seen that if the structure of recirculating-zone had not been destroyed, the lengths of recirculating-zone would increase with the increase of the gaps and the non-streamline-type bluff-body had the longest recirculating-zone among the five bluff-bodies. Another conclusion from analyzing the average turbulence energy in wake zone is that the intensity of the average turbulence energy was weakened with the increase of the gaps; in the end the zone with the biggest intensity would move backward and expanded to top and bottom boundaries of recirculating-zone. The structure of flow and the characteristics of flow behind all these five bluff-bodies were analyzed and a new basis for succulent hot experiment was given.

关 键 词：钝体 粒子影像测速 冷态实验 

分 类 号：TK16[动力工程及工程热物理—热能工程]