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The near wake of a model horizontal-axis wind turbine

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  • Ebert, P.R
  • Wood, D.H

Abstract

This paper concludes a series on the formation and development of the near-wake of a model horizontal-axis wind. The three-dimensional mean velocity and turbulence fields were obtained at six axial locations within two chord lengths of the blades for three operating conditions: stalled flow over the blades, close to optimum performance, and approaching runaway. Here we concentrate on the tip and hub vortices. For the second and third conditions, the hub vortex quickly becomes a sheet of vorticity spread over the cylindrical centrebody. It is suggested that the ‘trailing vorticity’ at the hub is formed by the skewing of the circumferential vorticity in the upstream boundary layer as it encounters the blades, so that the ‘bound’ vorticity of the blades simply passes through the centrebody surface. The tip vortices, which were shown in Part 2 to contain increasing amounts of angular momentum as the tip speed ratio increases, are associated with large variations in all velocity components and high levels of turbulence. The pitch of the helical tip vortices decreases with increasing tip speed ratio.

Suggested Citation

  • Ebert, P.R & Wood, D.H, 2001. "The near wake of a model horizontal-axis wind turbine," Renewable Energy, Elsevier, vol. 22(4), pages 461-472.
    • Handle: RePEc:eee:renene:v:22:y:2001:i:4:p:461-472
    DOI: 10.1016/S0960-1481(00)00096-3
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    1. Ebert, P.R. & Wood, D.H., 1999. "The near wake of a model horizontal-axis wind turbine—II. General features of the three-dimensional flowfield," Renewable Energy, Elsevier, vol. 18(4), pages 513-534.
    2. Ebert, P.R. & Wood, D.H., 1997. "The near wake of a model horizontal-axis wind turbine—I. Experimental arrangements and initial results," Renewable Energy, Elsevier, vol. 12(3), pages 225-243.
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    Cited by:

    1. 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.
    2. Ebert, P.R. & Wood, D.H., 2002. "The near wake of a model horizontal-axis wind turbine at runaway," Renewable Energy, Elsevier, vol. 25(1), pages 41-54.
    3. Xiaodong Wang & Yunong Liu & Luyao Wang & Lin Ding & Hui Hu, 2019. "Numerical Study of Nacelle Wind Speed Characteristics of a Horizontal Axis Wind Turbine under Time-Varying Flow," Energies, MDPI, vol. 12(20), pages 1-19, October.

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