脈動流中の静止三角柱からの渦放出に関する実験

概要

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The frequency of vortex shedding from a triangular cylinder in oscillatory flows in a pipe is measured. The flow oscillations are induced by means of a rotatable butterfly valve set downstream of the test section. It has been observed that the frequency of vortex shedding varies with both the oscillatory amplitude and Reynolds number under a constant oscillation frequency. These features are qualitatively the same as in the case of a circular cylinder. In order to control the vortex shedding, a triangular cylinder with a plate is used. The tendency of the Strouhal number to decrease with increasing oscillation amplitude is almost the same in the case of a circular cylinder, a triangular cylinder and a triangular cylinder with a plate. However, the triangular cylinder with a plate has the most stable characteristic of the three cylinder types in oscillatory flows. In a uniform flow, the shedding frequency varies with the distance s between the triangular cylinder and the plate, and shows a maximum value at a certain value of s.
一般社団法人日本機械学会の論文
1995-04-25