AERODYNAMIC STABILITY ANALYSIS OF FLOATING OFFSHORE WIND TURBINES UNDER SURGE CONDITION

Zhou Le; Ma Lu; Qin Ming; Zhang Xianfeng; Shen Xin; Du Zhaohui

doi:10.19912/j.0254-0096.tynxb.2023-1467

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 60-70. DOI: 10.19912/j.0254-0096.tynxb.2023-1467

AERODYNAMIC STABILITY ANALYSIS OF FLOATING OFFSHORE WIND TURBINES UNDER SURGE CONDITION

Zhou Le¹, Ma Lu², Qin Ming², Zhang Xianfeng², Shen Xin^1,3, Du Zhaohui^1,3

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Abstract

Aerodynamic stability has significant effect on the safety of the floating offshore wind turbine's operation. In the present study, the lifting-line free vortex wake model is adopted to analyze the aerodynamic stability of the airfoil and the rotor under surge condition through the aerodynamic work. The results show that the loads of the airfoil and the rotor will fluctuate periodically due to the surge motion of the floating platform, and the resulting aerodynamic damping will affect the aerodynamic stability of the wind turbine. In addition, the inflow wind velocity will also affect the aerodynamic damping of the wind turbine. When the wind velocity is large enough, the airfoils of the middle part of the blade will enter the deep stall state, so that the aerodynamic work of the airfoil during a surge period is negative. The rotor is affected by positive aerodynamic damping in a wide range of surge conditions and inflow wind velocities, and the aerodynamic damping ratio of the rotor decreases with the increase of the surge frequency and amplitude. When the surge condition is relatively severe, the rotor will enter the propeller state and the thrust direction will change, thus increasing the aerodynamic work of the rotor. In addition, after the servo control is turned on, the variable-speed and variable-pitch control of the system will change the absolute value and fluctuation amplitude of the loads, thus affecting the aerodynamic work of the wind turbine.

Key words

offshore wind turbines / aerodynamic stability / damping / surge motion / aerodynamic work

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Zhou Le, Ma Lu, Qin Ming, Zhang Xianfeng, Shen Xin, Du Zhaohui. AERODYNAMIC STABILITY ANALYSIS OF FLOATING OFFSHORE WIND TURBINES UNDER SURGE CONDITION[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 60-70 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1467

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