A stochastic model for the simulation of wind turbine blades in static stall

Authors

  • Franck Bertagnolio,

    Corresponding author
    1. Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
    • Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, Building 118, PO Box 49, DK-4000 Roskilde, Denmark
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  • Flemming Rasmussen,

    1. Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
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  • Niels N. Sørensen,

    1. Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
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  • Jeppe Johansen,

    1. Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
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  • Helge Aa. Madsen

    1. Wind Energy Division, National Laboratory for Sustainable Energy, Risø-DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
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Abstract

The aim of this work is to improve aeroelastic simulation codes by accounting for the unsteady aerodynamic forces that a blade experiences in static stall. A model based on a spectral representation of the aerodynamic lift force is defined. The drag and pitching moment are derived using a conditional simulation technique for stochastic processes. The input data for the model can be collected either from measurements or from numerical results from a Computational Fluid Dynamics code for airfoil sections at constant angles of attack. An analysis of such data is provided, which helps to determine the characteristics of stall. The model is applied to wind turbine rotor cases, including the stand still condition, and results are compared to experimental data. Copyright © 2009 John Wiley & Sons, Ltd.

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