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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2020-75
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-75
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 May 2020

Submitted as: research article | 05 May 2020

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This preprint is currently under review for the journal WES.

An improved second order dynamic stall model for wind turbine airfoils

Galih Bangga1, Thorsten Lutz1, and Matthias Arnold2 Galih Bangga et al.
  • 1Institute of Aerodynamics and Gas Dynamics (IAG), University of Stuttgart, 70569 Stuttgart, Germany
  • 2Wobben Research and Development GmbH, 26607 Aurich, Germany

Abstract. Robust and accurate dynamic stall modeling remains one of the most difficult tasks in wind turbine load calculations despite its long research effort in the past. In the present paper, a new second order dynamic stall model is developed with the main aim to model the higher harmonics of the vortex shedding while retaining its robustness for various flow conditions and airfoils. Comprehensive investigations and tests are performed by varying many flow parameters. The occurring physical characteristics for each case are discussed and evaluated in the present studies. The improved model is also tested on four different airfoils with different relative thicknesses. The validation against measurement data demonstrates that the improved model is able to reproduce the dynamic polar accurately without airfoil specific parameter calibration for each investigated flow condition and airfoil. This can deliver further benefit to industrial applications where experimental/reference data for calibrating the model is not always available.

Galih Bangga et al.

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Galih Bangga et al.

Galih Bangga et al.

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Short summary
Robust and accurate dynamic stall modeling remains one of the most difficult tasks in wind turbine load calculations despite its long research effort in the past. The present paper describes a new second order dynamic stall model for wind turbine airfoils. The new model is robust and improves the prediction for the aerodynamic forces and their higher harmonic effects due to vortex shedding, but also provides improved predictions for pitching moment and drag.
Robust and accurate dynamic stall modeling remains one of the most difficult tasks in wind...
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