一様流中で回転する多角柱まわりの流れ　回転数と渦周波数の同期現象について

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  • Vortex Shedding from a Rotating Regular Polygonal Prism in a Uniform Flow.
  • イチヨウリュウチュウ デ カイテンスル タカクチュウ マワリ ノ ナガレ カイ

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Synchronized vortex shedding from a rotating regular polygonal prism in a uniform flow is investigated numerically and experimentally The Karman vortex in a wake behind the prism rotating in a wind tunnel is investigated by using a hot-wire anemometer. The experimental results show that the Karman vortex shedding is synchronized with the rotation of the prism for a wide range of spill parameters. In numerical analysis, a body-fitted grid system that coincides with a moving boundary of the rotating prism is installed and the 2-dimensional Navier-Stokes equation is solved using the finite difference method. The numerical results show good agreement with the experimental ones. It is found from the experimental and numerical results that the general relation-ship between spin parameter S and Strouhal number St for an N-sided rotating polygonal prism is St=N/(κπ)·S(κ=1, 2, 3···).

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