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Improving the efficiency and the wake recovery rate of vertical-axis turbines using detached end-plates

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  • Villeneuve, Thierry
  • Boudreau, Matthieu
  • Dumas, Guy

Abstract

In the present work, Delayed Detached-Eddy Simulations (DDES) are conducted to evaluate the performance of an H-Darrieus vertical-axis turbine with detached end-plates, namely stationary end-plates that are not in contact with the turbine blades. More precisely, the force and the power coefficients of the turbine are analyzed for two different geometries of detached end-plates. The turbine wake dynamics is also presented and the main mechanisms responsible for the wake recovery rate are assessed. The results show that the presence of detached end-plates significantly increases the efficiency of the vertical-axis turbine considered. In addition to this improved efficiency, a semi-annular shape of detached end-plate leads to an improved recovery of the mean streamwise velocity in the turbine wake. The important wake recovery rate in the near-wake of the turbine with semi-annular detached end-plates is mainly related to the transport of momentum by the mean spanwise velocity field, which is also known to be the dominant contribution to the wake recovery rate of a turbine without detached end-plates. The results presented in this paper confirm that detached end-plates have a great potential to improve the performance of H-Darrieus vertical-axis turbines used both individually and within turbine farms.

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  • Villeneuve, Thierry & Boudreau, Matthieu & Dumas, Guy, 2020. "Improving the efficiency and the wake recovery rate of vertical-axis turbines using detached end-plates," Renewable Energy, Elsevier, vol. 150(C), pages 31-45.
    • Handle: RePEc:eee:renene:v:150:y:2020:i:c:p:31-45
    DOI: 10.1016/j.renene.2019.12.088
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    Cited by:

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    6. Villeneuve, Thierry & Dumas, Guy, 2021. "Impact of some design considerations on the wake recovery of vertical-axis turbines," Renewable Energy, Elsevier, vol. 180(C), pages 1419-1438.
    7. Jia Guo & Liping Lei, 2020. "Flow Characteristics of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes," Energies, MDPI, vol. 13(23), pages 1-23, November.
    8. Villeneuve, Thierry & Boudreau, Matthieu & Dumas, Guy, 2021. "Assessing the performance and the wake recovery rate of flapping-foil turbines with end-plates and detached end-plates," Renewable Energy, Elsevier, vol. 179(C), pages 206-222.
    9. Yosry, Ahmed Gharib & Álvarez, Eduardo Álvarez & Valdés, Rodolfo Espina & Pandal, Adrián & Marigorta, Eduardo Blanco, 2023. "Experimental and multiphase modeling of small vertical-axis hydrokinetic turbine with free-surface variations," Renewable Energy, Elsevier, vol. 203(C), pages 788-801.

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