后向台阶层流分离湍流结构的实验研究

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1996, Vol. 17 ›› Issue (2): 149-154.

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

Wang Jinjun, Lian Qixiang, Lan Shilong

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

Abstract

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

CLC Number:

Wang Jinjun;Lian Qixiang;Lan Shilong. EXPERIMENTAL INVESTIGATION ON THE TURBULENT COHERENT STRUCTURES OF LAMINAR SEPARATION FLOW OVER A BACKWARD-FACING STEP[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1996, 17(2): 149-154.

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

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