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Energies 2016, 9(8), 613; doi:10.3390/en9080613

Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction

State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China
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Academic Editor: Frede Blaabjerg
Received: 16 May 2016 / Revised: 26 July 2016 / Accepted: 28 July 2016 / Published: 3 August 2016

Abstract

Super typhoon activity is likely to make the electric power network fail, or blow the wind-measuring device off, which all lead to the yaw control system of wind turbine being inactive. Under this condition, blades can be blown by the violent side wind from unfavorable directions, and the aerodynamic loads on the wind turbine will be increased by a large amount, which can lead to low-cycle fatigue damage and other catastrophic collapses. So far, not enough consideration has been given to the above problems in wind turbine design. Using the transient computational fluid dynamics (CFD), this study investigates the wind load characteristics of offshore wind turbines under typhoon condition with 360-degree full wind directions. Two primary influence factors of the aerodynamic characteristics of wind turbines are clarified: variation of the wind direction and different parking positions of the wind rotor. Using 3D-numerical simulation results, this study provides detailed references for the ultimate strength and fatigue life in wind turbine design, and presents the best parking position of the wind turbine with a free yawing strategy. View Full-Text
Keywords: wind turbine; aerodynamic load; typhoon; computational fluid dynamics (CFD); full wind direction; parking position; boundary layer separation wind turbine; aerodynamic load; typhoon; computational fluid dynamics (CFD); full wind direction; parking position; boundary layer separation
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MDPI and ACS Style

Lian, J.; Jia, Y.; Wang, H.; Liu, F. Numerical Study of the Aerodynamic Loads on Offshore Wind Turbines under Typhoon with Full Wind Direction. Energies 2016, 9, 613.

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