一様流中で回転する円柱の後流構造 : 第1報,基本構造

概要

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The wake structure of a spinning cylinder situated in a uniform flow was experimentally investigated by means of the phase averaging technique. The measurements of velocity vectors were carried out at a section 7.5 diameters downstream from the axis of the spinning cylinder. The Strouhal number St of the vortex shedding from the cylinder gradually increases to the spin parameter s≈0.8. Here, the spin parameter s denotes the ratio of the circumferential velocity to that of the uniform flow. Beyond s≈0.8, St rapidly increases with respect to the increasing value of s. Corresponding to the trend of St, the coherent structures of the wake are in almost identical in the range of s=0~0.8, however, they become obscure ant are embedded in random fluctuating velocities as s increases. Furthermore, no coherent structures are found behind the spinning cylinder when s is over 1.7.
1989-01-25