1105 回転を与えた2個円柱まわりの流れに関する研究(GS-5 物体まわりの流れ,研究発表講演)

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This paper deals with an experimental study on the fluid around two circular cylinders in various arrangements. The surface roughness of the cylinders were smooth and rough respectively. The experiments were carried out in a wind-tunnel with a working section 300mm×50mm×500mm, the ratio L/d of the spacing L between the center of two cylinders to outer diameter d of the cylinder was 1.75 constant and the rotation ratio R_n of the cylinder A to the cylinder B used is 1.0 and 2.0. The surface-pressure distributions on the circular cylinders were measured in the range of Re=4.92×10^4〜8.11×10^4 and the drag and lift coefficients were determined from these measurements. The velocities in the wake were measured with a hot-wire anemometer. The flow patterns around the circular cylinders were visualized by a smoke tunnel. As a result, it was found that the drag and lift of circular cylinders were decreased in smooth case.
社団法人日本機械学会の論文
2005-03-18