18 Aug 2023
 | 18 Aug 2023
Status: this preprint is currently under review for the journal WES.

Influence of rotor blade flexibility on the near wake behavior of the NREL 5MW wind turbine

Leo Höning, Laura J. Lukassen, Bernhard Stoevesandt, and Iván Herráez

Abstract. High fidelity computational fluid dynamics simulations of the NREL 5MW wind turbine rotor are performed, comparing the aerodynamic behavior of flexible and rigid blades with respect to local blade quantities as well as the wake properties. The main focus has been set on rotational periodic quantities of blade loading and fluid velocity magnitudes in relation with the blade tip vortex trajectories describing the development of those quantities in the near wake. The results show that the turbine loading in a quasi-steady flow field are mainly influenced by blade deflections due to gravitation. Deforming blades change the aerodynamic behavior, which in turn influences the surrounding flow field, leading to non-uniform wake characteristics with respect to speed and shape.

Leo Höning et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2023-78', Anonymous Referee #1, 01 Sep 2023
  • RC2: 'Comment on wes-2023-78', Anonymous Referee #2, 12 Sep 2023

Leo Höning et al.

Leo Höning et al.


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Short summary
This study analyzes the impact of wind turbine rotor blade flexibility on the aerodynamic loading of the blades and the consequential wind characteristics in the near wake of the turbine. It is shown that gravitation leads to rotational periodic fluctuations of blade loading, which directly impacts the trajectory of the blade tip vortex at different rotor blade positions, while also resulting in a non-uniform wind velocity deficit in the wake of the wind turbine.