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Experimental investigation on performance improvement by mid-plane guide-vanes in a biplane-rotor Wells turbine for wave energy conversion

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  • Alves, João S.
  • Gato, Luís M.C.
  • Falcão, António F.O.
  • Henriques, João C.C.

Abstract

The Wells turbine is the most frequently used or proposed self-rectifying air turbine for oscillating-water-column wave-energy converter application, largely because of its conceptual and mechanical simplicity. Biplane Wells turbines allow a higher total blade solidity to be attained than monoplane turbines do, but this results in larger aerodynamic losses associated with the swirl kinetic energy loss at turbine exit. This may be overcome by the presence of a row of guide vanes between the two rotor planes, a solution that had been proposed and investigated theoretically or by numerical modelling. Results of turbine overall performance and flow details are reported from laboratory tests of a biplane Wells turbine without guide vanes and with specially designed guide vanes. The presence of the guide vanes was found to increase the peak efficiency by seven percentual points, while reducing (for fixed rotational speed) the damping provided by the turbine. Measured losses in the guide vane row were much smaller than in the rotors. Experimental results are compared with previously published numerical results. A stochastic theoretical transform was applied to obtain averaged results for the turbine performance subject to the irregular bidirectional air flow induced by real sea waves.

Suggested Citation

  • Alves, João S. & Gato, Luís M.C. & Falcão, António F.O. & Henriques, João C.C., 2021. "Experimental investigation on performance improvement by mid-plane guide-vanes in a biplane-rotor Wells turbine for wave energy conversion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    • Handle: RePEc:eee:rensus:v:150:y:2021:i:c:s1364032121007760
    DOI: 10.1016/j.rser.2021.111497
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    References listed on IDEAS

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    1. Falcão, António F.O. & Henriques, João C.C., 2016. "Oscillating-water-column wave energy converters and air turbines: A review," Renewable Energy, Elsevier, vol. 85(C), pages 1391-1424.
    2. Carrelhas, A.A.D. & Gato, L.M.C. & Henriques, J.C.C. & Falcão, A.F.O. & Varandas, J., 2019. "Test results of a 30 kW self-rectifying biradial air turbine-generator prototype," Renewable and Sustainable Energy Reviews, Elsevier, vol. 109(C), pages 187-198.
    3. Paderi, Maurizio & Puddu, Pierpaolo, 2013. "Experimental investigation in a Wells turbine under bi-directional flow," Renewable Energy, Elsevier, vol. 57(C), pages 570-576.
    4. 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.
    5. Das, Tapas K. & Kumar, Kumud & Samad, Abdus, 2020. "Experimental Analysis of a Biplane Wells Turbine under Different Load Conditions," Energy, Elsevier, vol. 206(C).
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    1. Stefanizzi, Michele & Camporeale, Sergio Mario & Torresi, Marco, 2023. "Experimental investigation of a Wells turbine under dynamic stall conditions for wave energy conversion," Renewable Energy, Elsevier, vol. 214(C), pages 369-382.
    2. Licheri, Fabio & Ghisu, Tiziano & Cambuli, Francesco & Puddu, Pierpaolo, 2022. "Detailed investigation of the local flow-field in a Wells turbine coupled to an OWC simulator," Renewable Energy, Elsevier, vol. 197(C), pages 583-593.
    3. Henriques, J.C.C. & Gato, L.M.C. & La Sala, V. & Carrelhas, A.A.D., 2023. "Acoustic noise emission of air turbines for wave energy conversion: Assessment and analysis," Renewable Energy, Elsevier, vol. 212(C), pages 897-907.
    4. Portillo, J.C.C. & Gato, L.M.C. & Henriques, J.C.C. & Falcão, A.F.O., 2023. "Implications of spring-like air compressibility effects in floating coaxial-duct OWCs: Experimental and numerical investigation," Renewable Energy, Elsevier, vol. 212(C), pages 478-491.
    5. Morais, F.J.F. & Carrelhas, A.A.D. & Gato, L.M.C., 2023. "Biplane-rotor Wells turbine: The influence of solidity, presence of guide vanes and comparison with other configurations," Energy, Elsevier, vol. 276(C).

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