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Simulating the aerodynamic performance and wake dynamics of a vertical-axis wind turbine

Scheurich, Frank and Fletcher, Timothy M. and Brown, Richard (2011) Simulating the aerodynamic performance and wake dynamics of a vertical-axis wind turbine. Wind Energy, 14 (2). pp. 159-177. ISSN 1095-4244

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    Abstract

    The accurate prediction of the aerodynamics and performance of vertical-axis wind turbines is essential if their design is to be improved but poses a signifi cant challenge to numerical simulation tools. The cyclic motion of the blades induces large variations in the angle of attack of the blades that can manifest as dynamic stall. In addition, predicting the interaction between the blades and the wake developed by the rotor requires a high-fi delity representation of the vortical structures within the fl ow fi eld in which the turbine operates. The aerodynamic performance and wake dynamics of a Darrieus-type vertical-axis wind turbine consisting of two straight blades is simulated using Brown’s Vorticity Transport Model. The predicted variation with azimuth of the normal and tangential force on the turbine blades compares well with experimental measurements. The interaction between the blades and the vortices that are shed and trailed in previous revolutions of the turbine is shown to have a signifi cant effect on the distribution of aerodynamic loading on the blades. Furthermore, it is suggested that the disagreement between experimental and numerical data that has been presented in previous studies arises because the blade–vortex interactions on the rotor were not modelled with sufficient fidelity.

    Item type: Article
    ID code: 30238
    Keywords: vertical-axis wind turbine , Darrieus rotor , blade–wake interaction , dynamic stall , numerical simulation , vorticity transport model, Mechanical engineering and machinery, Motor vehicles. Aeronautics. Astronautics, Mechanical Engineering, Computational Mechanics, Energy Engineering and Power Technology, Modelling and Simulation
    Subjects: Technology > Mechanical engineering and machinery
    Technology > Motor vehicles. Aeronautics. Astronautics
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
    Related URLs:
      Depositing user: Pure Administrator
      Date Deposited: 12 Apr 2011 16:22
      Last modified: 05 Sep 2014 16:39
      URI: http://strathprints.strath.ac.uk/id/eprint/30238

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