Structure of longitudinal vortices shedding periodically from two cylinders in a cruciform arrangement

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  • B202 十字交差二円柱から周期的に流出する縦渦の観察
  • ジュウジ コウサ 2 エンチュウ カラ シュウキテキ ニ リュウシュツスル タ

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Abstract

It was reported in earlier papers by the present authors that longitudinal vortices shed periodically from two cylinders in a cruciform arrangement with a gap s between them, placed in otherwise uniform flow. The longitudinal vortices can cause a strong vibration of the upstream cylinder. When the gap-to-diameter ratio s/d≤0.25, trailing vortices are shed periodically, and when 0.25≤s/d≤0.5, necklace vortices are shed periodically.<BR>In this work, the structure and the shedding process of the two types of the longitudinal vortices were investigated through flow visualization in a water tunnel. The vortex shedding frequency fv was obtained by a hot-film anemometer. Results concerning St-Re (St :Strouhal number, Re :Reynolds number) relationship for the longitudinal vortices obtained by the water tunnel measurements were found to correlate well with those by wind tunnel measurements.

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