航空学报 > 1994, Vol. 15 Issue (9): 1095-1099

三维弯管内分离流场的试验研究

许承, 郭荣伟   

  1. 南京航空航天大学2047教研室,南京,210016
  • 收稿日期:1993-06-25 修回日期:1993-11-02 出版日期:1994-09-25 发布日期:1994-09-25

EXPERIMEMNTAL INVESTIGATION FOR SEPARATED FLOW IN THREE-DIMENSIONAL BEND DUCT

Xu Cheng, Guo Rongwei   

  1. Faculty 2047,Nanjing University of Aeronautics&Astronautics,Nanjing,210016
  • Received:1993-06-25 Revised:1993-11-02 Online:1994-09-25 Published:1994-09-25

摘要: 通过热线测速系统对三维90°弯管分离流场的气流特性进行了实验研究,通过对分离流场的测量及观察,给出了时均速度、脉动速度、雷诺应力的大小等数据。结果表明:在管道的中心线附近远离分离泡区域的紊流可以看作各向同性的;而分离泡与主流的过渡区域表现为强烈的各向异性;回流区的平均速度场分布与紊流度无关,回流的雷诺剪应力大小与当地平均速度无关,回流不是来自很远的下游。

关键词: 分离流, 弯管, 热线测量, 紊流模型

Abstract: The experimental investigation for turbulent separated flow in a 3-D 90°bend duct is reported.It is shown that,near the duct centre-lines,the turbulent flow can be ide-alized as local isotropy.The region between the separated bubble and the main region shows strong anisotropy.So the anisotropy of closure assumptions has to be taken into account in prediction methods.The Reynolds stress in the recirculation region is due to the turbulence structure,not the local mean velocity gradient.

Key words: separated flow, bend duct, hot- wireturbulent model

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