The Flow over an Inclined Fence in a Turbulent Boundary Layer.

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  • 平板乱流境界層内に設置された傾斜フェンスまわりの流れ
  • ヘイバン ランリュウ キョウカイソウ ナイ ニ セッチ サレタ ケイシャ フェンスマワリ ノ ナガレ

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The purpose of this paper is to study in detail the flow over an inclined fence in a turbulent boundary layer, as basic research which issues from promoting heat transfer and the decrease of the pressure drop. The fence height h set in a turbulent boundary layer is 3 mm (uτh/ν≒75, uτ : friction velocity, ν : kinematic viscosity) and setting angle of a fence is 20° in the free stream direction. The time averaged velocity profiles in the downstream of the fence ware measured by using a 3-hole pitot tube. We investigated velocity profiles by utilizing polar diagram, logarithmic velocity distributions and velocity defect law. Consequently, It was found that the spanwise velocity profiles are cross-over profiles. We clarified the relaxation process from streamwise direction velocity. Further we investigated in detail the flow direction on the wall which shows the wall shear direction by the oil flow visualization.

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