10.1186/2251-6832-4-35

Load evaluation of horizontal-axis wind turbine rotor using coupled Beddoes near-wake model and free-wake method

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  • Abdelfattah Bouatem*1,
  • Ahmed Almers2,
  • Noureddine Boutammachte2,
  1. Department of Mechanical Engineering, Moulay Ismail University, ENSAM-MEKENS, Meknes, 50003, MA
  2. Department of Energetic, Moulay Ismail University, ENSAM-MEKENS, Meknes, 50003, MA
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Published in Issue 2013-09-09

How to Cite

Bouatem, A., Almers, A., & Boutammachte, N. (2013). Load evaluation of horizontal-axis wind turbine rotor using coupled Beddoes near-wake model and free-wake method. International Journal of Energy and Environmental Engineering, 4(1 (December 2013). https://doi.org/10.1186/2251-6832-4-35
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Abstract

Abstract Wind turbines operate mostly in yaw conditions that give rise to cyclic variations in aerodynamic forces applied on the blade. This induced load fluctuation is closely related to the upstream velocity field of the rotor and can be a significant source of fatigue and vibration. An accurate prediction of blade loading is considered the key in designing reliable and efficient wind turbines. The related calculation remains a complicated task to perform and requires enormous computing time. In this context, a numerical method is presented, aimed at evaluating the azimuthal fluctuation of the normal force. This method is obtained by coupling the Beddoes near-wake model and the free-wake method: the near-wake-induced velocities are calculated using Beddoes near-wake model with the far-wake contribution evaluated using the free-wake method. In addition, the unsteady effects on the aerodynamic coefficients are taken into account using the Beddoes-Leishman dynamic stall model. A computer code was developed, and numerical values were obtained in acceptable computational time. Results are compared with measurements performed in the NASA Ames wind tunnel.

Keywords

  • Wind turbine,
  • Yaw,
  • Skewed wake,
  • Stall delay,
  • Free wake,
  • Near wake,
  • Far wake
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