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Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies

Kim, D.H. and Yu, D.O. and Kwon, O.J. and Fletcher, T.M. and Scheurich, F. and Brown, R.E. (2010) Predicting unsteady blade loads of a wind turbine using RANS and vorticity transport methodologies. In: European Wind Energy Conference, 2010-04-20 - 2010-04-23, Warsaw, Poland.

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    Abstract

    Numerical simulations of the NREL phase VI wind turbine operating in yawed conditions have been performed using two computational methods; one based on the solution of the Reynolds-averaged Navier-Stokes equations (RANS) using unstructured overset meshes and one known as the Vorticity Transport Model (VTM) that is based on the solution of the vorticity transport equation. Simulations with and without the instrumentation enclosure that was present during the NREL experiments were performed. It was found that the enclosure influenced the loading significantly at the inboard part of the blade when the blade passed through the wake that was developed by the enclosure. Both the RANS and VTM codes are able to predict well the unsteady and time-averaged aerodynamic loadings on the wind turbine blades at low wind speeds. At high wind speeds, leading-edge flow separation and strong radial flow are observed on the suction surface of the blades, when the blades are at the retreating side of the rotor. Both the RANS and VTM codes provide less accurate predictions of the blade loads. However, at the advancing side of the rotor, the flow is mostly attached to the surface of the blade, and both the RANS and VTM predictions of the blade loads are in good agreement with the measured data.

    Item type: Conference or Workshop Item (Paper)
    ID code: 27361
    Keywords: wind turbine, RANS, vorticity transport model, yaw, unsteady three-dimensional flow, Mechanical engineering and machinery
    Subjects: Technology > Mechanical engineering and machinery
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
    Related URLs:
    Depositing user: Ms Katrina May
    Date Deposited: 10 Sep 2010 12:50
    Last modified: 06 Oct 2012 08:57
    URI: http://strathprints.strath.ac.uk/id/eprint/27361

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