平板乱流境界層内に設置された円柱突起まわりの流れ(流体工学,流体機械)

概要

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The wind force acting on a cylindrical protuberance placed on a turbulent boundary layer has been investigated. The diameters of the cylindrical protuberance were D=40 and 80mm, the Reynolds numbers based on D were 5.3×10^4 and 1.1×10^5. The turbulent boundary layer thickness where the cylindrical protuberance was placed was various from 26 to 130mm. An aspect ratio (=height/diameter) was varied from 0.125 to 1.0. The flow visualizations by the surface oil-flow pattern method were carried out. The surface pressure distributions on the cylindrical protuberance were measured and the drag and lift coefficients were determined by integration of the surface pressure of the cylindrical protuberance. It was cleared that the correlations among the fluid force, the turbulent boundary layer thickness and the aspect ratio of the cylindrical protuberance.
2004-05-25