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Energies 2013, 6(4), 2242-2261; doi:10.3390/en6042242
Article

Torsional Stiffness Effects on the Dynamic Stability of a Horizontal Axis Wind Turbine Blade

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Received: 23 January 2013 / Revised: 14 March 2013 / Accepted: 3 April 2013 / Published: 19 April 2013
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Abstract

Aeroelastic instability problems have become an increasingly important issue due to the increased use of larger horizontal axis wind turbines. To maintain these large structures in a stable manner, the blade design process should include studies on the dynamic stability of the wind turbine blade. Therefore, fluid-structure interaction analyses of the large-scaled wind turbine blade were performed with a focus on dynamic stability in this study. A finite element method based on the large deflection beam theory is used for structural analysis considering the geometric nonlinearities. For the stability analysis, a proposed aerodynamic approach based on Greenberg’s extension of Theodorsen’s strip theory and blade element momentum method were employed in conjunction with a structural model. The present methods proved to be valid for estimations of the aerodynamic responses and blade behavior compared with numerical results obtained in the previous studies. Additionally, torsional stiffness effects on the dynamic stability of the wind turbine blade were investigated. It is demonstrated that the damping is considerably influenced by variations of the torsional stiffness. Also, in normal operating conditions, the destabilizing phenomena were observed to occur with low torsional stiffness.
Keywords: blade element momentum method; dynamic stability; fluid-structure interaction; Greenberg’s extension of Theodorsen’s strip theory; wind energy blade element momentum method; dynamic stability; fluid-structure interaction; Greenberg’s extension of Theodorsen’s strip theory; wind energy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Jeong, M.-S.; Lee, I.; Yoo, S.-J.; Park, K.-C. Torsional Stiffness Effects on the Dynamic Stability of a Horizontal Axis Wind Turbine Blade. Energies 2013, 6, 2242-2261.

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