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Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions

Author

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  • Stefan Hoerner

    (Laboratory of Fluid Dynamics and Technical Flows, Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
    Laboratory of Geophysical and Industrial Flows, University Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France)

  • Iring Kösters

    (Laboratory of Fluid Dynamics and Technical Flows, Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany)

  • Laure Vignal

    (Laboratory of Geophysical and Industrial Flows, University Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France)

  • Olivier Cleynen

    (Laboratory of Fluid Dynamics and Technical Flows, Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany)

  • Shokoofeh Abbaszadeh

    (Laboratory of Electrical Drive Systems, Institute of Electric Power Systems, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany)

  • Thierry Maître

    (Laboratory of Geophysical and Industrial Flows, University Grenoble Alpes, CNRS, Grenoble INP, LEGI, F-38000 Grenoble, France)

  • Dominique Thévenin

    (Laboratory of Fluid Dynamics and Technical Flows, Institute of Fluid Dynamics and Thermodynamics, Otto von Guericke University Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany)

Abstract

Oscillating hydrofoils were installed in a water tunnel as a surrogate model for a hydrokinetic cross-flow tidal turbine, enabling the study of the effect of flexible blades on the performance of those devices with high ecological potential. The study focuses on a single tip-speed ratio (equal to 2), the key non-dimensional parameter describing the operating point, and solidity (equal to 1.5), quantifying the robustness of the turbine shape. Both parameters are standard values for cross-flow tidal turbines. Those lead to highly dynamic characteristics in the flow field dominated by dynamic stall. The flow field is investigated at the blade level using high-speed particle image velocimetry measurements. Strong fluid–structure interactions lead to significant structural deformations and highly modified flow fields. The flexibility of the blades is shown to significantly reduce the duration of the periodic stall regime; this observation is achieved through systematic comparison of the flow field, with a quantitative evaluation of the degree of chaotic changes in the wake. In this manner, the study provides insights into the mechanisms of the passive flow control achieved through blade flexibility in cross-flow turbines.

Suggested Citation

  • Stefan Hoerner & Iring Kösters & Laure Vignal & Olivier Cleynen & Shokoofeh Abbaszadeh & Thierry Maître & Dominique Thévenin, 2021. "Cross-Flow Tidal Turbines with Highly Flexible Blades—Experimental Flow Field Investigations at Strong Fluid–Structure Interactions," Energies, MDPI, vol. 14(4), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:797-:d:492289
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    References listed on IDEAS

    as
    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. Chuhua Jiang & Xuedao Shu & Junhua Chen & Lingjie Bao & Hao Li, 2020. "Research on Performance Evaluation of Tidal Energy Turbine under Variable Velocity," Energies, MDPI, vol. 13(23), pages 1-14, November.
    3. Müller-Vahl, Hanns Friedrich & Nayeri, Christian Navid & Paschereit, Christian Oliver & Greenblatt, David, 2016. "Dynamic stall control via adaptive blowing," Renewable Energy, Elsevier, vol. 97(C), pages 47-64.
    4. 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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    Cited by:

    1. Abhishekkumar Shingala & Olivier Cleynen & Aman Jain & Stefan Hoerner & Dominique Thévenin, 2022. "Genetic Optimisation of a Free-Stream Water Wheel Using 2D Computational Fluid Dynamics Simulations Points towards Design with Fully Immersed Blades," Energies, MDPI, vol. 15(10), pages 1-20, May.
    2. 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.

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