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Abstract Based on hydrokinetic energy harvested in ocean current power generation driven by vortex-induced vibration (VIV), the free VIV of a four cylindrical structure with coupling connection under uniform current velocities was simulated.It was found that the response amplitudes of the vibration system were significantly different under smaller and larger reduced velocities Ur with the change of combination spacing ratio LH/D2.Therefore, amplitude spectra of displacement, lift characteristics, phase angles of the structure under Ur=5.71 and Ur=14.29 were analyzed.The results show that when Ur=5.71, lift forces change along sine signal and the main frequencies of each cylinder’s lift force are obvious under different spacing ratios, the phase angles Φ between lift force and displacement are different, four cylinders all have incentive effect on the vibration of the structure, consequently, the harvesting hydrokinetic energy from current or the mechanical energy transferred to current are stable; when Ur=14.29, the lift forces of each cylinder fluctuate irregularly, frequency components are complicated, the phase angles Φ between the lift force and displacement are not obvious, so the harvesting hydrokinetic energy of each cylinder is not stable and the two cylinders in downstream play an important role in structure vibration.The study results provid a reference to the reduced velocity range for a multi-cylinder structure when energy is extracted from ocean current.
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Received: 01 November 2017
Published: 15 April 2019
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