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A novel twin-rotor radial-inflow air turbine for oscillating-water-column wave energy converters

Author

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  • Falcão, António F.O.
  • Gato, Luís M.C.
  • Henriques, João C.C.
  • Borges, João E.
  • Pereiras, Bruno
  • Castro, Francisco

Abstract

A novel air turbine for bidirectional flows in oscillating-water-column wave energy converters is presented and its performance is analyzed. The turbine is based on a pair of conventional radial-inflow rotors mounted on the same shaft, complemented by the corresponding guide vane rows, by a curved-duct manifold arranged circumferentially in a period manner and by a two-position cylindrical valve. Numerical values of the performance of the whole machine were obtained from published experimental data of the flow through a conventional radial-inflow gas turbine, together with CFD (computational fluid dynamics) results for aerodynamic losses in the curved duct manifold. Four different geometries, combined with five different sizes, of the curved-duct manifold were numerically simulated. Windage losses, that occur at the inactive rotor and are inherent to the machine conception, were found to be a major loss. A peak value of about 86% was obtained for the overall efficiency of the machine. Comparisons are presented between the new turbine and the biradial turbine (sliding guide-vanes version), the latter being possibly the most efficient self-rectifying turbine model-tested so far. The new turbine was found to be more efficient, both in peak instantaneous efficiency and in maximum average efficiency in random waves, by a margin of about 8%.

Suggested Citation

  • Falcão, António F.O. & Gato, Luís M.C. & Henriques, João C.C. & Borges, João E. & Pereiras, Bruno & Castro, Francisco, 2015. "A novel twin-rotor radial-inflow air turbine for oscillating-water-column wave energy converters," Energy, Elsevier, vol. 93(P2), pages 2116-2125.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:2116-2125
    DOI: 10.1016/j.energy.2015.10.046
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    1. Jayashankar, V. & Anand, S. & Geetha, T. & Santhakumar, S. & Jagadeesh Kumar, V. & Ravindran, M. & Setoguchi, T. & Takao, M. & Toyota, K. & Nagata, S., 2009. "A twin unidirectional impulse turbine topology for OWC based wave energy plants," Renewable Energy, Elsevier, vol. 34(3), pages 692-698.
    2. Falcão, A.F.O. & Gato, L.M.C. & Nunes, E.P.A.S., 2013. "A novel radial self-rectifying air turbine for use in wave energy converters. Part 2. Results from model testing," Renewable Energy, Elsevier, vol. 53(C), pages 159-164.
    3. Mala, K. & Jayaraj, J. & Jayashankar, V. & Muruganandam, T.M. & Santhakumar, S. & Ravindran, M. & Takao, M. & Setoguchi, T. & Toyota, K. & Nagata, S., 2011. "A twin unidirectional impulse turbine topology for OWC based wave energy plants – Experimental validation and scaling," Renewable Energy, Elsevier, vol. 36(1), pages 307-314.
    4. Falcão, A.F.O. & Gato, L.M.C. & Nunes, E.P.A.S., 2013. "A novel radial self-rectifying air turbine for use in wave energy converters," Renewable Energy, Elsevier, vol. 50(C), pages 289-298.
    5. Setoguchi, T & Santhakumar, S & Maeda, H & Takao, M & Kaneko, K, 2001. "A review of impulse turbines for wave energy conversion," Renewable Energy, Elsevier, vol. 23(2), pages 261-292.
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    2. Torres, Fernando R. & Teixeira, Paulo R.F. & Didier, Eric, 2018. "A methodology to determine the optimal size of a wells turbine in an oscillating water column device by using coupled hydro-aerodynamic models," Renewable Energy, Elsevier, vol. 121(C), pages 9-18.
    3. Moretti, Giacomo & Malara, Giovanni & Scialò, Andrea & Daniele, Luca & Romolo, Alessandra & Vertechy, Rocco & Fontana, Marco & Arena, Felice, 2020. "Modelling and field testing of a breakwater-integrated U-OWC wave energy converter with dielectric elastomer generator," Renewable Energy, Elsevier, vol. 146(C), pages 628-642.
    4. Ansarifard, Nazanin & Kianejad, S.S. & Fleming, Alan & Henderson, Alan & Chai, Shuhong, 2020. "Design optimization of a purely radial turbine for operation in the inhalation mode of an oscillating water column," Renewable Energy, Elsevier, vol. 152(C), pages 540-556.
    5. Liu, Zhen & Cui, Ying & Li, Ming & Shi, Hongda, 2017. "Steady state performance of an axial impulse turbine for oscillating water column wave energy converters," Energy, Elsevier, vol. 141(C), pages 1-10.
    6. Manuel García-Díaz & Bruno Pereiras & Celia Miguel-González & Laudino Rodríguez & Jesús Fernández-Oro, 2021. "CFD Analysis of the Performance of a Double Decker Turbine for Wave Energy Conversion," Energies, MDPI, vol. 14(4), pages 1-19, February.
    7. Nazanin Ansarifard & Alan Fleming & Alan Henderson & S.S. Kianejad & Shuhong Chai, 2019. "Design Optimisation of a Unidirectional Centrifugal Radial-Air-Turbine for Application in OWC Wave Energy Converters," Energies, MDPI, vol. 12(14), pages 1-22, July.
    8. García-Díaz, Manuel & Pereiras, Bruno & Miguel-González, Celia & Rodríguez, Laudino & Fernández-Oro, Jesús, 2021. "Design of a new turbine for OWC wave energy converters: The DDT concept," Renewable Energy, Elsevier, vol. 169(C), pages 404-413.
    9. Carrelhas, A.A.D. & Gato, L.M.C. & Henriques, J.C.C., 2023. "Peak shaving control in OWC wave energy converters: From concept to implementation in the Mutriku wave power plant," Renewable and Sustainable Energy Reviews, Elsevier, vol. 180(C).
    10. Pierre Benreguig & James Kelly & Vikram Pakrashi & Jimmy Murphy, 2019. "Wave-to-Wire Model Development and Validation for Two OWC Type Wave Energy Converters," Energies, MDPI, vol. 12(20), pages 1-28, October.
    11. Gato, L.M.C. & Maduro, A.R. & Carrelhas, A.A.D. & Henriques, J.C.C. & Ferreira, D.N., 2021. "Performance improvement of the biradial self-rectifying impulse air-turbine for wave energy conversion by multi-row guide vanes: Design and experimental results," Energy, Elsevier, vol. 216(C).
    12. Lopes, Bárbara S. & Gato, Luís M.C. & Falcão, António F.O. & Henriques, João C.C., 2019. "Test results of a novel twin-rotor radial inflow self-rectifying air turbine for OWC wave energy converters," Energy, Elsevier, vol. 170(C), pages 869-879.
    13. Portillo, J.C.C. & Henriques, J.C.C. & Gato, L.M.C. & Falcão, A.F.O., 2023. "Model tests on a floating coaxial-duct OWC wave energy converter with focus on the spring-like air compressibility effect," Energy, Elsevier, vol. 263(PA).

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