力学学报 ›› 1993, Vol. 25 ›› Issue (2): 129-133.doi: 10.6052/0459-1879-1993-2-1995-623

• 论文 •    下一篇

后向台阶湍流拟序结构的实验研究

连淇祥   

  1. 北京航空航天大学流体所,100083
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1993-03-25 发布日期:1993-03-25

AN EXPERIMENTAL INVESTIGATION OF THE COHERENT STRUCTURES OF THE FLOW BEHIND A BACKWARD FACING STEP

  1. 北京航空航天大学流体所,100083
  • Received:1900-01-01 Revised:1900-01-01 Online:1993-03-25 Published:1993-03-25

摘要: 在水槽中用氢气泡法观测了一个后向台阶的回流区、再附区和边界层再生区的大涡和湍流团的发展,以及近壁区的流动结构,观察到大涡结构对湍流团产生的作用。

关键词: 拟序结构, 后向台阶, 流动显示

Abstract: The coherent structures of the flows in the recirculate region, reattaching region and tht boundary layer redeveloping region behind a backward facing step were investigated experimentally. The step height is 2cm, and the Reynolds number based on step height is 1900 to 3400. The flow structures were visualized by hydrogen bubble technique. The large vortical structures in the outer region and the streaky structures in the wall region were investigated.

Key words: coherent structure, backward facing step, flow visualization