Simulation of shear and turbulence impact on wind turbine performance

Rozenn Wagner, Michael Courtney, Torben J. Larsen, Uwe Schmidt Paulsen

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    Aerodynamic simulations (HAWC2Aero) were used to investigate the influence of the speed shear, the direction shear and the turbulence intensity on the power output of a multi-megawatt turbine. First simulation cases with laminar flow and power law wind speed profiles were compared to the case of a uniform inflow. Secondly, a similar analysis was done for cases with direction shear. In each case, we derived a standard power curve (function of the wind speed at hub height) and power curves obtained with various definitions of equivalent wind speed in order to reduce the scatter due to shear. Thirdly, the variations of the power output and the power curve were analysed for various turbulence intensities. Furthermore, the equivalent speed method was successfully tested on a power curve resulting from simulations cases combining shear and turbulence. Finally, we roughly simulated the wind speed measurements we may get from a LIDAR mounted on the nacelle of the turbine (measuring upwind) and we investigated different ways of deriving an equivalent wind speed from such measurements.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages55
    ISBN (Print)978-87-550-3801-1
    Publication statusPublished - 2010
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Remote measurements and measurement technique
    • Wind energy
    • Risø-R-1722
    • Risø-R-1722(EN)

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