Aeroelastic coupling analysis of the flexible blade of a wind turbine

Journal Reference

Energy, Volume 89, 2015, Pages 1001-1009.

Wenwei Mo, Deyuan Li, Xianneng Wang, Cantang Zhong

School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

Abstract

This paper presents an aeroelastic coupling analysis of the flexible blade of a large scale HAWT (horizontal axis wind turbine). To model the flexibility of the blade more accurately, ‘SE’ (super-element) is introduced to the blade dynamics model. The flexible blade is discretized into a MBS (multi-body system) using a limited number of SEs. The blade bending vibration and torsional deflection are both considered when calculating the aerodynamic loads; thus, the BEM (blade element momentum) theory used in this study is modified. In addition, the B–L (Beddoes–Leishman) dynamic stall model is integrated into the BEM-modified model to investigate the airfoil dynamic stall characteristics. The nonlinear governing equations of the constrained blade MBS are derived based on the theory of MBS dynamics coupling with the blade aerodynamics model. The time domain aeroelastic responses of the United States NREL (National Renewable Energy Laboratory) offshore 5-MW wind turbine blade are obtained. The simulation results indicate that blade vibration and deformation have significant effects on the aerodynamic loads, and the dynamic stall can cause more violent fluctuation for the blade aerodynamic loads compared with the steady aerodynamic model, which can considerably affect the blade fatigue load spectrum analysis and the fatigue life design

Go To Energy

About the author

Dr. Deyuan Li obtained his Ph.D. in Engineering in June 2000 from Chongqing University with the specialty of solid mechanics. He is Professor at Guangdong University of Technology’s School of Electromechanical Engineering, China, working in the fields of structural dynamics and aerodynamics of wind turbines. 

About the author

Xianneng Wang is Postgraduate for Master’s Degree at Guangdong University of Technology’s School of Electromechanical Engineering. His main interest is computational dynamics of multibody systems.

About the author

Wenwei Mo received his Master’s Degree (2013) in engineering from Guangdong University of Technology, with a thesis work focused on aeroelastic analysis of wind turbines based on aerodynamics and computational dynamics of multibody systems. He recently enrolled as a Ph.D. student at University of Technology Sydney. His main interests are multibody dynamics and finite element analysis.

 

Aeroelastic coupling analysis of the flexible blade of wind turbine

 

Check Also

Verification of a novel innovative blade root design for wind turbines using a hybrid numerical method