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Study of wake characteristics of a vertical axis wind turbine by two- and three-dimensional computational fluid dynamics simulations

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  • Lam, H.F.
  • Peng, H.Y.

Abstract

In this work, the near and far wakes of a low-solidity two-straight-bladed vertical axis wind turbine (VAWT) were, for the first time, investigated with two- and three-dimensional computational fluid dynamics (CFD) simulations. The wake velocity field and turbulence field from 1 to 10 turbine diameters (1D to 10D) downstream were examined. Structured meshes were generated throughout the computational domain for calculation accuracy and efficiency. Both the transition shear stress transport (SST) and the detached eddy simulation (DES) models were used to close the unsteady Reynolds-averaged Navier–Stokes (URANS) equations. The CFD models were validated by particle image velocimetry (PIV) test results from the literature. The regions of the near and far wakes were defined based on the occurrence of the maximum velocity deficit. In the near wake (within 3D), the velocity suffered a drastic deficit of about 85%. In the far wake (beyond 3D), major velocity recovery occurred with the average stream-wise velocity reaching approximately 75% at 10D. The wake asymmetry grew as the downstream distance increased, and the causes behind it were examined. Further, investigation into the dimensional effects of the CFD models, and the blade tip and span vortices was conducted.

Suggested Citation

  • Lam, H.F. & Peng, H.Y., 2016. "Study of wake characteristics of a vertical axis wind turbine by two- and three-dimensional computational fluid dynamics simulations," Renewable Energy, Elsevier, vol. 90(C), pages 386-398.
    • Handle: RePEc:eee:renene:v:90:y:2016:i:c:p:386-398
    DOI: 10.1016/j.renene.2016.01.011
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    References listed on IDEAS

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