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Effect of Vertical Confinement and Blade Flexibility on Cross-Flow Turbines

Author

Listed:
  • Mohamed-Larbi Kara-Mostefa

    (Institut PPRIME UPR 3346 CNRS, Université de Poitiers, ISAE-ENSMA, 86073 Poitiers, France)

  • Ludovic Chatellier

    (Institut PPRIME UPR 3346 CNRS, Université de Poitiers, ISAE-ENSMA, 86073 Poitiers, France)

  • Lionel Thomas

    (Institut PPRIME UPR 3346 CNRS, Université de Poitiers, ISAE-ENSMA, 86073 Poitiers, France)

Abstract

Both scientific and industrial communities have a growing interest in marine renewable energies. There is a wide variety of technologies in this domain, with different degrees of maturity. This study focuses on two models of a mast-free vertical axis Darrieus tidal turbine with the objective of characterizing the effect of vertical confinement, rotor configuration, and fluid–structure interactions on their performances in free-surface flows. The first model comprised four straight rigid blades maintained by circular flanges on both ends of the rotor and the second model is equipped with free-ended interchangeable blades attached to a single upper flange. Two configurations of the second model mounted with either rigid or flexible blades were used, first for comparison with the dual-flange turbine, then in order to address the effect of fluid–structure interactions on the turbine performances. While the single-flange models exhibit a significantly lower efficiency at all operating points, it is observed that the use of flexible blades tends to enhance turbine performances at low Reynolds numbers. The flow topology obtained from PIV measurement at selected operating points is discussed with respect to the performance of each turbine model in order to highlight the role of the dynamic stall and blade–vortex interactions.

Suggested Citation

  • Mohamed-Larbi Kara-Mostefa & Ludovic Chatellier & Lionel Thomas, 2023. "Effect of Vertical Confinement and Blade Flexibility on Cross-Flow Turbines," Energies, MDPI, vol. 16(9), pages 1-15, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3693-:d:1132693
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    References listed on IDEAS

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    1. Zeiner-Gundersen, Dag Herman, 2015. "A novel flexible foil vertical axis turbine for river, ocean, and tidal applications," Applied Energy, Elsevier, vol. 151(C), pages 60-66.
    2. Lazauskas, L. & Kirke, B.K., 2012. "Modeling passive variable pitch cross flow hydrokinetic turbines to maximize performance and smooth operation," Renewable Energy, Elsevier, vol. 45(C), pages 41-50.
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