EXPERIMENTAL STUDY ON VORTEX-INDUCED MOTION OF FLOATING CYLINDER AT HIGH REYNOLDS NUMBER

Zhou Yang, Zhang Yilin, Li Zhongming, Wang Feng

Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 536-541.

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 536-541. DOI: 10.19912/j.0254-0096.tynxb.2022-0349

EXPERIMENTAL STUDY ON VORTEX-INDUCED MOTION OF FLOATING CYLINDER AT HIGH REYNOLDS NUMBER

  • Zhou Yang1, Zhang Yilin2, Li Zhongming2, Wang Feng2
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Abstract

In this paper, a series of cylinder model tests were carried out in a towing tank to study the vortex-induced motion (VIM) response characteristics of floating wind turbine at high Reynolds number. The cylinder tested has a diameter of 0.5 m and a length of 1 m. The sway and surge responses of the model were tested to analyze the motion trajectory, vortex shedding frequency and response amplitude. The reduced velocity is from 5.6 to 22.6, and the Reynolds number is from 75,000 to 300,000. It is shown that the response amplitude of VIM first increases and then decreases with the increase of reduction velocity. The obvious “lock-in” phenomenon occurs under the reduction velocity range of 9.4 to 13.2. In the lock-in region, the vortex shedding frequency is close to the natural frequency of 0.053 Hz, the surge frequency is twice as high as that of sway frequency and the motion trajectory of the model shows an obvious“8”shape. The amplitude of surge is much smaller than that of sway at different reduced velocities, and the sway motion is dominant.

Key words

offshore wind power / vortex-induced motion / cylinder / model test / high Reynolds number / lock-in region

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Zhou Yang, Zhang Yilin, Li Zhongming, Wang Feng. EXPERIMENTAL STUDY ON VORTEX-INDUCED MOTION OF FLOATING CYLINDER AT HIGH REYNOLDS NUMBER[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 536-541 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0349

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