The effects of yawing motion with different frequencies on the hydrodynamic performance of floating vertical-axis tidal current turbines |
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| Institution: | 1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 232000, China;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, China;3. Department of Marine Technology, Norwegian University of Science and Technology, Norway;1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China |
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| Abstract: | Under real sea conditions, the hydrodynamic performance of floating vertical-axis tidal current turbines is affected by waves and currents. The wave circular frequency is a significant factor in determining the frequencies of the wave-induced motion responses of turbines. In this study, the ANSYS-CFX software (manufacturer: ANSYS Inc., Pittsburgh, Pennsylvania, United States) is used to analyse the hydrodynamic performance of a vertical-axis turbine for different yawing frequencies and to study how the yawing frequencies affect the main hydrodynamic coefficients of the turbine, including the power coefficient, thrust coefficient, lateral force coefficient, and yawing moment coefficient. The time-varying curves obtained from the CFX software are fitted using the least-squares method; the damping and added mass coefficients are then calculated to analyse the influence of different yawing frequencies. The simulation results demonstrate that when analysing non-yawing turbines rotating under constant inflow, the main hydrodynamic coefficient time-varying curves of yawing turbines exhibit an additional fluctuation. Furthermore, the amplitude is positively correlated with the yawing frequency, and the oscillation amplitudes also increase with increasing yawing frequency; however, the average values of the hydrodynamic coefficients (except the power coefficient) are only weakly influenced by yawing motion. The power coefficient under yawing motion is lower than that under non-yawing motion, which means that yawing motion will cause the annual energy production of a turbine to decrease. The fitting results show that the damping term and the added mass term exert effects of the same level on the loads and moments of vertical-axis turbines under yawing motion. The results of this study can facilitate the study of the motion response of floating vertical-axis tidal current turbine systems in waves. |
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| Keywords: | Tidal current energy Vertical-axis tidal current turbine Hydrodynamic performance Added mass coefficient Damping coefficient |
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