傾斜円柱から流出するカルマン渦の構造 : 後流中の二次流れとの関係

概要

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In order to investigate the effect of yaw angle of Karman vortex shedding from a circular cylinder in a uniform flow, the flow pattern was observed by the smoke wire method. The pressure distribution, secondary flow in the wake along the cylinder and the velocity fluctuation, u, at a point where Karman vortex shedding was clearly observed in the u-signal, were measured. The yaw angle produced a pressure gradient along the cylinder in the dead water region behind it. Secondary flow due to this pressure gradient made the formation of Karman vortex 3-dimensional. The frequency and the regularity of the vortex shedding reduced with increasing yaw angle. When a pair of parallel thin plates was set in the wake to interrupt the secondary flow, the above effects of yaw angle were effectively reduced in the area between them.
一般社団法人日本機械学会の論文
1986-09-25