Numerical Simulation Method for the Aeroelasticity of Flexible Wind Turbine Blades under Standstill Conditions

Xianyou Wu (), Rongxiang Liu, Yan Li, Pin Lv, Chuanqiang Gao and Kai Feng
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Xianyou Wu: College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Rongxiang Liu: School of Aeronautic, Northwestern Polytechnical University, Xi’an 710072, China
Yan Li: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd., Beijing 100176, China
Pin Lv: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd., Beijing 100176, China
Chuanqiang Gao: School of Aeronautic, Northwestern Polytechnical University, Xi’an 710072, China
Kai Feng: College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China

Energies, 2024, vol. 17, issue 14, 1-24

Abstract: With the trend towards larger and lighter designs of wind turbines, blades are progressively being developed to have longer and more flexible configurations. Under standstill conditions, the separated flow induced by a wide range of incident flow angles can cause complex aerodynamic elastic phenomena on blades. However, classical momentum blade element theory methods show limited applicability at high angles of attack, leading to significant inaccuracies in wind turbine performance prediction. In this paper, the geometrically accurate beam theory and high-fidelity CFD method are combined to establish a bidirectional fluid–structure coupling model, which can be used for the prediction of the aeroelastic response of wind turbine blades and the analysis of fluid–structure coupling. Aeroelastic calculations are carried out for a single blade under different working conditions to analyze the influence of turbulence, gravity and other parameters on the aeroelastic response of the blade. The results show that the dominant frequency of the vibration deformation response in the edgewise direction is always the same as the first-order edgewise frequency of the blade when the incoming flow condition is changed. The loading of gravity will make the aeroelastic destabilization of the blade more significant, which indicates that the influence of gravity should be taken into account in the design of the aeroelasticity of the wind turbine. Increasing the turbulence intensity will change the dominant frequency of the vibration response in the edgewise direction, and at the same time, it will be beneficial to the stabilization of the aeroelasticity response.

Keywords: wind turbine blade; fluid–structure coupling; aeroelastic analysis; edgewise vibration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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