Preprints
https://doi.org/10.5194/wes-2021-100
https://doi.org/10.5194/wes-2021-100

  17 Sep 2021

17 Sep 2021

Review status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

A computationally efficient engineering aerodynamic model for non-planar wind turbine rotors

Ang Li, Mac Gaunaa, Georg Raimund Pirrung, and Sergio González Horcas Ang Li et al.
  • Department of Wind Energy, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark

Abstract. In the present work, a computationally efficient engineering model for the aerodynamic load calculation of non-planar wind turbine rotors is proposed. The method is based on the vortex cylinder model, and can be used in two ways: either as a correction to the currently widely used blade element momentum (BEM) method, or used as the main model, replacing the BEM method in the engineering modelling complex. The proposed method needs the same order of computational effort as the ordinary BEM method, which makes it ideal for time-domain aero-servo-elastic simulations. The results from the proposed method are compared with results from two higher-fidelity aerodynamic models: a lifting-line method and a Navier-Stokes solver. For planar rotors, the aerodynamic loads are identical to the current BEM model when the drag force is excluded during the calculation of the induced velocities. For non-planar rotors, the influence of the blade out-of-plane shape, measured by the difference of the load between the non-planar rotor and the planar rotor, is in very good agreement with higher-fidelity models. Meanwhile, the existing BEM methods, even with a correction of radial induction included, show relatively large deviations from the higher-fidelity method results.

Ang Li et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-100', Anonymous Referee #1, 22 Sep 2021
  • RC2: 'Comment on wes-2021-100', Anonymous Referee #2, 22 Oct 2021
  • AC1: 'Comment on wes-2021-100', Ang Li, 25 Nov 2021
    • EC1: 'Reply on AC1', Alessandro Bianchini, 25 Nov 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-100', Anonymous Referee #1, 22 Sep 2021
  • RC2: 'Comment on wes-2021-100', Anonymous Referee #2, 22 Oct 2021
  • AC1: 'Comment on wes-2021-100', Ang Li, 25 Nov 2021
    • EC1: 'Reply on AC1', Alessandro Bianchini, 25 Nov 2021

Ang Li et al.

Ang Li et al.

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Short summary
An engineering aerodynamic model for non-planar horizontal-axis wind turbines is proposed. The performance of the model is comparable with high-fidelity models, but has similarly low computational cost as currently used low-fidelity models, which does not have such capability to model non-planar rotors. The developed model could be used for an efficient and accurate load calculation of non-planar wind turbines, and eventually be integrated in a design optimization framework.