A modified free wake vortex ring method for horizontal-axiswind turbines

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Abstract

A modified free-wake vortex ring model is proposed to compute the dynamics of a floating horizontal-axis wind turbine, which 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 with straight lifting lines assumption. 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 5 MW NREL rotor and compared with other aerodynamic models for the same rotor subjected to different platform motions. The results show that the proposed method is reliable. In addition, the proposed method is less time consuming and has similar accuracy when comparing with more advanced vortex based methods.

Original languageEnglish
Article number3900
Number of pages24
JournalEnergies
Volume12
Issue number20
DOIs
Publication statusPublished - 15 Oct 2019

Keywords

  • Aerodynamics
  • Floating wind energy
  • Free wake vortex method
  • Horizontal-axis wind turbine

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