A Model Test Investigation on Vortex-induced Motions of the Buoyancy Can

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (14) : 9-18.

Kang Zhuang1，Li Ping1

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Abstract

This paper makes experimental studies on the vortex-induced motion response of a free vibration buoyancy can. The buoyancy can was put vertically, with the diameter of 150mm and the length of 700mm. The model test could measure motion parameters of 6-DOF under different work condition and analyse motion responses of the cross-flow, in-line and yaw direction. The results indicated that the motion frequency of in-line was twice as big as that of cross-flow and the trajectory of the cylinder was obviously in “8”shape when the reduced velocity became large. Then, the yaw motion frequency was single under the small reduced velocity and when reduced velocity got larger it appeared two frequencies, both increase as the reduced velocity increases, and the larger yaw motion frequency was equal to the CF frequency, so the excitation sources of CF motion and yaw motion were the same, namely coupling effect. It was also found that the mean drag coefficient of VIM was about 100% more than the circular cylinder.

Key words

buoyancy can / VIM / model test / “8”shape

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Kang Zhuang1，Li Ping1. A Model Test Investigation on Vortex-induced Motions of the Buoyancy Can[J]. Journal of Vibration and Shock, 2017, 36(14): 9-18

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