円柱後流渦列の普遍ストローハル数に関する研究　表面粗さの影響

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書誌事項

タイトル別名
  • Study of the Universal Strouhal Numer over the Wide Reynolds Number Flow Range. Effect of Surface Roughness.
  • エンチュウ コウリュウ ウズレツ ノ フヘン ストローハルスウ ニカンスルケン

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説明

Universality of the Strouhal number in the wake flow of a cylinder over a wide range of Reynolds numbers, i.e., 5×104<Re<107, was considered. Eight cylinders with various surface roughnesses were used for the measurement. The universal strouhal numbers considered were Roshko's number, Bearman's number, Griffin's number and that took the measured values of the width of wake streets for the reference length. These universal Strouhal numbers were calculated using the measured values of vortex frequency, surface pressure distributions and drag. Comparisons were made. It was made clear that Bearman's number was the most uniform of all the universal Strouhal numbers considered. It had a uniform value of 0.18 throughout the Reynolds number range. The reason for the nonuniformity of other Strouhal numbers was also considered.

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