1507 円柱からの渦放出に及ぼすフィンの影響(J11-2 流れと音の相関計測,J11 流体関連の騒音と振動)

概要

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The effect of fin around a bare tube on Karman vortex shedding was experimentally investigated. This fin was made from a thin plate and mounted spirally around a bare tube surface. We measured the distributions of the mean velocity, the intensity of velocity fluctuation, the spectrum of velocity fluctuation and the coherence distribution of Karman vortex along the tube axis. And the flow around the fin tube was visualized by using the smoke wire technique. As a result it was made clear that the periodic velocity fluctuation caused by Karman vortex was observed in the wake of the fin tube although the fin mounted around a bare tube. The vortices in the near-wake of the fin tube make the cell structure with the scale of the pitch length of the fins. The rotation axis of the each vortex was inclined against the tube axis. The large scale vortex was formed by the reconnection of the vortex cells.
社団法人日本機械学会の論文
2007-09-07