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Experimental investigation of tip-speed-ratio influence on horizontal-axis wind turbine wake dynamics

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  • Bayron, Paul
  • Kelso, Richard
  • Chin, Rey

Abstract

Wind tunnel experiments were performed to study the influence of tip speed ratio, TSR or λ, on the spatial evolution of mean velocity, turbulence intensity, energy spectrum and integral length scale in the wake of a small-scale horizontal axis wind turbine model. Three TSR conditions, λ=5.6, λ=6.5 and λ=8.5 were tested and measured at various streamwise locations from 1 to 11 rotor diameters (D) from the rotor plane using constant temperature hotwire anemometry. Findings from the experiments show that the magnitudes of the velocity and turbulence within the wake, along with the uniformity of their distributions, are influenced by the TSR due to the increased interaction of the rotor wake and the nacelle-tower wake. Furthermore, the turbine operated at λ=8.5 has the overall lowest streamwise velocity deficit and the lowest maximum turbulence intensity in the far wake compared with the lower TSR cases. The increased turbulence within the near wake has likely promoted more mixing leading to a faster wake recovery.

Suggested Citation

  • Bayron, Paul & Kelso, Richard & Chin, Rey, 2024. "Experimental investigation of tip-speed-ratio influence on horizontal-axis wind turbine wake dynamics," Renewable Energy, Elsevier, vol. 225(C).
    • Handle: RePEc:eee:renene:v:225:y:2024:i:c:s0960148124002660
    DOI: 10.1016/j.renene.2024.120201
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