Abstract
The motions of the floating vertical axis wind turbine (VAWT) with consideration of the coupling between the aerodynamics and the hydrodynamics are calculated in this paper. The surge-heave-pitch coupling nonlinear equations of the floating VAWT are established. The aerodynamic loads are obtained by applying the double-multiple-stream tube theory with consideration of the dynamic stall and the floating foundation motion. The motion performances of a 5 MW Φ - Darrieus type floating VAWT are studied with its foundation of the Spar type with heave plates. It is shown that the amplitude of the heave motion of the floating VAWT is small when the heave plates are equipped. The effects of the wind and wave loads on the floating VAWT motions are assessed. The results show that the mean values of the surge and the pitch of the floating VAWT are mainly related to the wind loads; the standard deviations of the surge, the heave, and the pitch are mainly related to the wave loads. In the regular wave cases, the frequencies of the surge, the heave and the pitch are dominated by the wave frequencies, and the components of the 2P responses (caused by the aerodynamic loads) of the pitch are small. The 2P responses of the pitch are more significant in the irregular wave cases as compared with those in the regular wave cases.
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Acknowledgements
This work was supported by the Natural Science Foundation of Tianjin (Grant No. 16JCYBJC21200), the Fund of the State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University (Grant No.1501).
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Project supported by the National Natural Science Foundation of China (Grant No. 51579176).
Biography: Ying Guo (1991-), Female, Ph. D. Candidate
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Guo, Y., Liu, Lq., Li, Y. et al. The surge-heave-pitch coupling motions of the Φ-type vertical axis wind turbine supported by the truss Spar floating foundation. J Hydrodyn 31, 669–681 (2019). https://doi.org/10.1007/s42241-018-0158-7
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DOI: https://doi.org/10.1007/s42241-018-0158-7