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Aerodynamic analysis of a biradial turbine with movable guide-vanes: Incidence and slip effects on efficiency

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  • Ferreira, D.N.
  • Gato, L.M.C.
  • Eça, L.
  • Henriques, J.C.C.

Abstract

The paper presents a numerical study on the aerodynamics of a biradial turbine for wave energy conversion. The turbine is symmetrical with respect to a plane perpendicular to its axis of rotation. The two inlet/outlet rotor openings are axially offset from each other facing the radial direction and two rows of radial-flow movable guide-vanes surround the rotor. The existence of a counter-rotating eddy in the relative flow between rotor blades affects both the flow incidence angle at the rotor inlet and the outlet flow angle. A model was used to predict the incidence at the rotor inlet and the slip at the outlet, and the resulting data was employed to redesign the rotor inlet/outlet blade metal angle for the original guide-vane set. Numerical results for the new geometry were compared with data for the original turbine. The rotor and diffuser losses were reduced especially at operating conditions away from the peak efficiency point, resulting in higher average turbine efficiency.

Suggested Citation

  • Ferreira, D.N. & Gato, L.M.C. & Eça, L. & Henriques, J.C.C., 2020. "Aerodynamic analysis of a biradial turbine with movable guide-vanes: Incidence and slip effects on efficiency," Energy, Elsevier, vol. 200(C).
    • Handle: RePEc:eee:energy:v:200:y:2020:i:c:s0360544220306095
    DOI: 10.1016/j.energy.2020.117502
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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. 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.
    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.
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    Citations

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    Cited by:

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    2. 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.
    3. Ferreira, D.N. & Gato, L.M.C. & Eça, L., 2023. "Efficiency of biradial impulse turbines concerning rotor blade angle, guide-vane deflection and blockage," Energy, Elsevier, vol. 266(C).
    4. 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).
    5. 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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