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Article

Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch

1
Grenoble INP, Université Grenoble Alpes, CNRS, LEGI, 38000 Grenoble, France
2
Naval Academy Research Institute (IRENav), Ecole Navale, BCRM Brest, CC600, CEDEX9, F-29240 Brest, France
*
Author to whom correspondence should be addressed.
Academic Editor: Guillou Sylvain
Energies 2021, 14(3), 667; https://doi.org/10.3390/en14030667
Received: 20 December 2020 / Revised: 22 January 2021 / Accepted: 22 January 2021 / Published: 28 January 2021
(This article belongs to the Special Issue Tidal Turbines)
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. View Full-Text
Keywords: marine renewable energy; Vertical Axis Tidal Turbine (VATT); variable pitch; CFD marine renewable energy; Vertical Axis Tidal Turbine (VATT); variable pitch; CFD
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MDPI and ACS Style

Delafin, P.-L.; Deniset, F.; Astolfi, J.A.; Hauville, F. Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch. Energies 2021, 14, 667. https://doi.org/10.3390/en14030667

AMA Style

Delafin P-L, Deniset F, Astolfi JA, Hauville F. Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch. Energies. 2021; 14(3):667. https://doi.org/10.3390/en14030667

Chicago/Turabian Style

Delafin, Pierre-Luc; Deniset, François; Astolfi, Jacques A.; Hauville, Frédéric. 2021. "Performance Improvement of a Darrieus Tidal Turbine with Active Variable Pitch" Energies 14, no. 3: 667. https://doi.org/10.3390/en14030667

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