AM05-04-003 バックステップ乱流における圧力勾配の影響(境界層とせん断流1,一般講演)

概要

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In this experimental research, we investigate the turbulent flow over a backward-facing step. To specify the effect of pressure gradient on the mean velocity profile in the recovery region, Couette-Poiseuille type backward-facing step flows, whose upstream channel flows are the flows between moving and stationary walls, are studied. The stationary wall has a step and resultant channel expansion ratio (ER) is 1.50. The upstream flows are pure Poiseuille (β_0=-1), pure Couette (β_0=0) and Couette-Poiseuille (β_0=-0.5) turbulence channel flows. The Reynolds number based on the friction velocity and upstream channel half width is about 300. The mean velocity profiles measured by H-W anemometry are arranged corresponding to the logarithmic and half power laws. In particular at the velocity recovery region with adverse pressure gradient, the half power law is clearly observed in the mean velocity profiles.
2005-09-05