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Near wake hydrodynamics and structural design of a single foil cycloidal rotor in regular waves

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  • Arredondo-Galeana, Abel
  • Olbert, Gerrit
  • Shi, Weichao
  • Brennan, Feargal

Abstract

We present a hydrodynamic and structural model to design a single foil wave cycloidal rotor in regular waves. The hydrodynamic part considers potential flow and represents the foil as a point vortex. Unsteady effects are accounted for through Theodorsen’s function. The structural part utilises beam theory to compute the bending moments and stresses on the foil of the cyclorotor. The validity of the hydrodynamic model is explored with the aid of CFD, and the CFD results are bench marked versus experimental measurements. Results show that the hydrodynamic model estimates the mean radial loading on the foil within 20%–25% in attached flow conditions, whilst it is accurate to predict the mean tangential loading only when operating close to stall, at maximum lift conditions. Because the optimal structural operation of the rotor is in attached flow conditions, and close to stall, we utilise the coupled model to design a rotor that operates optimally for a range of different sea conditions. We find that with careful dimensioning of the radius and span, power extraction in regular waves can be optimised, whilst the structural penalty is kept constant at the allowable stress level.

Suggested Citation

  • Arredondo-Galeana, Abel & Olbert, Gerrit & Shi, Weichao & Brennan, Feargal, 2023. "Near wake hydrodynamics and structural design of a single foil cycloidal rotor in regular waves," Renewable Energy, Elsevier, vol. 206(C), pages 1020-1035.
    • Handle: RePEc:eee:renene:v:206:y:2023:i:c:p:1020-1035
    DOI: 10.1016/j.renene.2023.02.068
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    References listed on IDEAS

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    1. Siegel, Stefan G., 2019. "Numerical benchmarking study of a Cycloidal Wave Energy Converter," Renewable Energy, Elsevier, vol. 134(C), pages 390-405.
    2. Le Fouest, Sébastien & Mulleners, Karen, 2022. "The dynamic stall dilemma for vertical-axis wind turbines," Renewable Energy, Elsevier, vol. 198(C), pages 505-520.
    3. Stefania Zanforlin & Fulvio Buzzi & Marika Francesconi, 2019. "Performance Analysis of Hydrofoil Shaped and Bi-Directional Diffusers for Cross Flow Tidal Turbines in Single and Double-Rotor Configurations," Energies, MDPI, vol. 12(2), pages 1-25, January.
    4. Windt, Christian & Davidson, Josh & Ringwood, John V., 2018. "High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 610-630.
    5. Sierra, Joan Pau & White, Adam & Mösso, Cesar & Mestres, Marc, 2017. "Assessment of the intra-annual and inter-annual variability of the wave energy resource in the Bay of Biscay (France)," Energy, Elsevier, vol. 141(C), pages 853-868.
    6. Scarlett, Gabriel Thomas & Sellar, Brian & van den Bremer, Ton & Viola, Ignazio Maria, 2019. "Unsteady hydrodynamics of a full-scale tidal turbine operating in large wave conditions," Renewable Energy, Elsevier, vol. 143(C), pages 199-213.
    7. Abel Arredondo-Galeana & Feargal Brennan, 2021. "Floating Offshore Vertical Axis Wind Turbines: Opportunities, Challenges and Way Forward," Energies, MDPI, vol. 14(23), pages 1-24, November.
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    1. Abel Arredondo-Galeana & Baran Yeter & Farhad Abad & Stephanie Ordóñez-Sánchez & Saeid Lotfian & Feargal Brennan, 2023. "Material Selection Framework for Lift-Based Wave Energy Converters Using Fuzzy TOPSIS," Energies, MDPI, vol. 16(21), pages 1-26, October.

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