1404 異なる姿勢での 2 個円柱まわりの流れ : 表面粗さの違い

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This paper deals with an experimental study on the fluid flow around two circular cylinders in various arrangements. The surface roughness the of two cylinders was changed respectively. The experiment was carried out in a wind-tunnel with a working section 300mm×50mm×500mm, the ratio L/D of the spacing L between the two cylinders centers to outer diameter D of cylinder the was 1.75 constant. The surface-pressure distributions on the circular cylinders were measured in the range of Re=0.57×(10)^4∿6.63×(10)^4 and the drag and lift coefficients were determined from these measurements. The velocity in the wake was measured with a hot-wire anemometer. The flow patterns around the two circular cylinders were visualized by a smoke tunnel. As a result, when the two cylinders with rough surface were by compared to the two with smooth surface, it was found that the drags of both cylinders were decreased in smooth case.
社団法人日本機械学会の論文