Preprint Article Version 1 This version is not peer-reviewed

A Modified Free Wake Vortex Ring Method for Horizontal-Axis Wind Turbines

Version 1 : Received: 5 August 2019 / Approved: 6 August 2019 / Online: 6 August 2019 (12:48:36 CEST)

A peer-reviewed article of this Preprint also exists.

Dong, J.; Viré, A.; Ferreira, C.S.; Li, Z.; van Bussel, G. A Modified Free Wake Vortex Ring Method for Horizontal-Axis Wind Turbines. Energies 2019, 12, 3900. Dong, J.; Viré, A.; Ferreira, C.S.; Li, Z.; van Bussel, G. A Modified Free Wake Vortex Ring Method for Horizontal-Axis Wind Turbines. Energies 2019, 12, 3900.

Journal reference: Energies 2019, 12, 3900
DOI: 10.3390/en12203900

Abstract

A modified free-wake vortex ring model is proposed to compute the dynamics of a floating horizontal-axis wind turbine. The model is divided into two parts. The near wake model uses a blade bound vortex model and trailed vortex model, which is developed based on vortex filament method. By contrast, the far wake model is based on the vortex ring method. The proposed model is a good compromise between accuracy and computational cost, for example when compared with more complex vortex methods. The present model is used to assess the influence of floating platform motions on the performance of a horizontal-axis wind turbine rotor. The results are validated on the 5MW NREL rotor and compared with other aerodynamic models for the same rotor subjected to different platform motions. It was found that the results from the proposed method are more reliable than the results from BEM theory especially at small angles of attack in the region of low wind speeds, on the one hand, and high wind speeds with blade pitch motions, on the other hand. And also the proposed method is less time consuming and has similar accuracy when comparing with more advanced vortex based methods.

Subject Areas

free wake vortex method, horizontal-axis wind turbine, floating wind energy, aerodynamics

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