航空学报 > 1996, Vol. 17 Issue (2): 149-154

后向台阶层流分离湍流结构的实验研究

王晋军, 连淇祥, 兰世隆   

  1. 北京航空航天大学流体力学研究所,北京,100083
  • 收稿日期:1994-04-23 修回日期:1994-12-05 出版日期:1996-04-25 发布日期:1996-04-25

EXPERIMENTAL INVESTIGATION ON THE TURBULENT COHERENT STRUCTURES OF LAMINAR SEPARATION FLOW OVER A BACKWARD-FACING STEP

Wang Jinjun, Lian Qixiang, Lan Shilong   

  1. Fluid Mechanics Institute, Beijing University of Aeronautics and Astronoutics,Beijing,100083
  • Received:1994-04-23 Revised:1994-12-05 Online:1996-04-25 Published:1996-04-25

摘要: 实验研究是应用 LDV及氢泡显示技术在水流中进行的。得到了剪切层厚度、涡量厚度、拟序结构以及再附后壁面切应力、边界层形状因子等的变化规律。对流动再附后壁面附近带条结构进行了详细分析。结果表明在流动再附后 2 0倍台阶高度处形成湍流边界层

关键词: 后向断阶, 分离流, 层流边界层, 流动特性

Abstract: An experimental investigation was conducted with LDV and hydrogen bubble techniques in water flow. The shear layer thickness, the vorticity thickness, the maximum value of turbulence intensities, the turbulent coherent structure, the variations fo wall shear stress and the boundary layer shape factor were obtained. In the region of redevelopment a detailed analysis was first made for the streak structures in the near wall region, and the turbulent boundary layer was formed at (x-x r)/ h =20

Key words: backward facing steps, separated flow, laminar boundary layer, flow characteristics

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