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Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch

Author

Listed:
  • Pierre-Luc Delafin

    (Grenoble INP, Université Grenoble Alpes, CNRS, LEGI, 38000 Grenoble, France)

  • François Deniset

    (Naval Academy Research Institute (IRENav), Ecole Navale, BCRM Brest, CC600, CEDEX9, F-29240 Brest, France)

  • Jacques André Astolfi

    (Naval Academy Research Institute (IRENav), Ecole Navale, BCRM Brest, CC600, CEDEX9, F-29240 Brest, France)

  • Frédéric Hauville

    (Naval Academy Research Institute (IRENav), Ecole Navale, BCRM Brest, CC600, CEDEX9, F-29240 Brest, France)

Abstract

Vertical axis turbines, also called Darrieus turbines, present interesting characteristics for offshore wind and tidal applications but suffer from vibrations and a lower efficiency than the more conventional horizontal axis turbines. The use of variable pitch, in order to control the angle of attack of the blades continuously during their rotation, is considered in this study to overcome these problems. 2D blade-resolved unsteady Reynolds-Averaged Navier–Stokes (RANS) simulations are employed to evaluate the performance improvement that pitching blades can bring to the optimal performance of a three-straight-blade vertical axis tidal turbine. Three pitching laws are defined and tested. They aim to reduce the angle of attack of the blades in the upstream half of the turbine. No pitching motion is used in the downstream half. The streamwise velocity, monitored at the center of the turbine, together with the measurement of the blades’ angle of attack help show the effectiveness of the proposed pitching laws. The decrease in the angle of attack in the upstream half of a revolution leads to a significant increase in the power coefficient ( + 40 % ) and to a better balance of the torque generated in the upstream and downstream halves. Both torque and thrust ripples are therefore significantly reduced.

Suggested Citation

  • Pierre-Luc Delafin & François Deniset & Jacques André Astolfi & Frédéric Hauville, 2021. "Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch," Energies, MDPI, vol. 14(3), pages 1-18, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:667-:d:488847
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    References listed on IDEAS

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    Cited by:

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    2. Kamal, Md. Mustafa & Saini, R.P., 2022. "A numerical investigation on the influence of savonius blade helicity on the performance characteristics of hybrid cross-flow hydrokinetic turbine," Renewable Energy, Elsevier, vol. 190(C), pages 788-804.
    3. Alina Fazylova & Baurzhan Tultayev & Teodor Iliev & Ivaylo Stoyanov & Ivan Beloev, 2023. "Development of a Control Unit for the Angle of Attack of a Vertically Axial Wind Turbine," Energies, MDPI, vol. 16(13), pages 1-20, July.
    4. Abed, Bouabdellah & Benzerdjeb, Abdelouahab & Benmansour, Abdeljellil & Achache, Habib & Ferhat, Rabia & Debz, Abderrahmene & Gorlov, Alaxender M., 2021. "An efficient hydrodynamic method for cross-flow turbines performance evaluation and comparison with the experiment," Renewable Energy, Elsevier, vol. 180(C), pages 993-1003.
    5. Paul Brousseau & Mustapha Benaouicha & Sylvain Guillou, 2021. "Hydrodynamic Efficiency Analysis of a Flexible Hydrofoil Oscillating in a Moderate Reynolds Number Fluid Flow," Energies, MDPI, vol. 14(14), pages 1-19, July.
    6. Sylvain S. Guillou & Eric Bibeau, 2023. "Tidal Turbines," Energies, MDPI, vol. 16(7), pages 1-5, April.

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