A STUDY ON EFFECTS OF FREE END CONDITION ON VORTEX-INDUCED VIBRATION OF CIRCULAR TOWER AT A HIGH WIND SPEED

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  • 自由端渦の形成特性に着目した高風速渦励振の発現メカニズムに関する研究
  • ジユウタン ウズ ノ ケイセイ トクセイ ニ チャクモク シタ コウフウソク ウズレイシン ノ ハツゲン メカニズム ニ カンスル ケンキュウ

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Abstract

Wind tunnel experiments using a circular cylinder rocking model were conducted to investigate the characteristics of the vortex-induced vibration at a high wind speed. Attaching a thin circular disk on the model top to modify the flow passing the free-end, the response of that vibration was diminished and the occurrence wind speed tended to be rather low as increase of the disk diameter. This reason was clarified by measurement of the wake fluctuation around the free-end: as the disk diamter increased, the generation of the tip-associated vortex which had been considered as the cause of that vibration weakened and its frequency gradually increased.

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