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The effect of the boundary layer on the wake of a horizontal axis wind turbine

Author

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  • Sedaghatizadeh, Nima
  • Arjomandi, Maziar
  • Kelso, Richard
  • Cazzolato, Benjamin
  • Ghayesh, Mergen H.

Abstract

This paper analyses the effect of a mean shear similar to an atmospheric boundary layer on the wake of a wind turbine by means of Large Eddy Simulation. More specifically, a comparison is made between the wake in the presence of a smooth boundary layer and that in the absence of a boundary layer (i.e., an unconfined uniform incoming flow). The numerical simulations show that the presence of a smooth boundary layer lowers the power output, however, the rings of tip vortices in the presence of a power-law incoming flow are more stable than for a uniform incoming flow. More importantly, the length of the wake region for the case with the smooth boundary layer is about 12D, which is much shorter than for a uniform incoming flow (namely 20D). Strong downwash, observed at this distance in the presence of a smooth boundary layer, results in a higher velocity magnitude and lower turbulence in the far wake of the wind turbine when compared with a uniform flow. A mechanism explaining these observations is also proposed. This new knowledge may result in denser wind farms, compared with wind farms established on smoother surfaces.

Suggested Citation

  • Sedaghatizadeh, Nima & Arjomandi, Maziar & Kelso, Richard & Cazzolato, Benjamin & Ghayesh, Mergen H., 2019. "The effect of the boundary layer on the wake of a horizontal axis wind turbine," Energy, Elsevier, vol. 182(C), pages 1202-1221.
    • Handle: RePEc:eee:energy:v:182:y:2019:i:c:p:1202-1221
    DOI: 10.1016/j.energy.2019.06.066
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    Cited by:

    1. Regodeseves, P. García & Morros, C. Santolaria, 2020. "Unsteady numerical investigation of the full geometry of a horizontal axis wind turbine: Flow through the rotor and wake," Energy, Elsevier, vol. 202(C).
    2. Yuan Li & Zengjin Xu & Zuoxia Xing & Bowen Zhou & Haoqian Cui & Bowen Liu & Bo Hu, 2020. "A Modified Reynolds-Averaged Navier–Stokes-Based Wind Turbine Wake Model Considering Correction Modules," Energies, MDPI, vol. 13(17), pages 1-19, August.
    3. El Fajri, Oumnia & Bowman, Joshua & Bhushan, Shanti & Thompson, David & O'Doherty, Tim, 2022. "Numerical study of the effect of tip-speed ratio on hydrokinetic turbine wake recovery," Renewable Energy, Elsevier, vol. 182(C), pages 725-750.

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