1702 流れ方向強制振動円柱から放出される円柱スパン方向の渦流れの構造(G05-1 渦,G05 流体工学)

概要

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In this study, the flow features of vortex shedding from a circular cylinder oscillating along the direction of the flow were observed by visualizing water flow experiment at the ranges of the frequency ratio f/f_K=0〜5, amplitude ratio 2a/d=0.4 and Reynolds number Re=1700. As a result of the experiments, the structure of the vortex flow which depends on the frequency ratio was clarified by observing flow from both to the axial direction and the direction of span. In the case of lock-in state f_<VK>/f=1/1, two kinds of vortex structure were obtained. One of which was three-dimensional on the side of low oscillation frequency, and the other was two-dimensional on the side of high oscillation frequency. In the case of lock-in state f_<VK>/f=1/2, even if the lock-in had occurred, it was shown that the phase difference sometimes occurred to the direction of the span in vortex shedding.
一般社団法人日本機械学会の論文
2007-09-07