壁面ブロッキング効果により発生するコーナー近傍での二次流れ(流体工学,流体機械)

概要

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The secondary flow of the Prandtl's second kind near a right-angled streamwise corner induced by the wall blocking effect is investigated by means of the laboratory experiments using a wind tunnel. A turbulence-generating grid is installed at the entrance to the test section to generate nearly isotropic, grid turbulence. The corner plate having a sharp edge is installed at the downstream of the grid. The turbulent Reynolds number based on the integral length scale in the grid turbulence, Re_L, is 1,400 at the leading edge of the plate. The three components of instantaneous velocities are measured using a hot wire anemometry. The results show that the secondary flow occurs near the corner when the corner is placed in the grid turbulence, whereas no secondary flow is observed in the absence of the grid turbulence. The results agree well with the previous analysis based on the rapid distortion theory. The results confirm the generation of the secondary flow of the Prandtl's second kind along the corner by the wall blocking effect.
社団法人日本機械学会の論文
2009-01-25