フィン付き円柱からの渦放出に関する研究 (<小特集>流体関連振動・騒音等)

概要

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The periodic phenomena of velocity fluctuation in the near wake of a circular cylinder with fin were experimentally investigated. In the present paper the discussion is focused on the effects of the shape and the pitch of the fin around a circular pipe on the periodic phenomena. The distributions of the mean velocity, the intensity of velocity fluctuation and its spectrum were measured as well as the coherence of a shedding vortex in the spanwise direction. As a result it was made clear that Karman vortex shedding was clearly formed even in the case of a cylinder with complicated fin. The increase in the number of fin effectively causes the increase in the equivalent diameter. The coherent scale in the spanwise direction is larger in the case with fin compared with that of the simple circular cylinder with the same diameter. A correlation of the equivalent diameter and the Strouhal number are also proposed.
一般社団法人日本機械学会の論文
1999-07-25