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Performance improvement of the biradial self-rectifying impulse air-turbine for wave energy conversion by multi-row guide vanes: Design and experimental results

Author

Listed:
  • Gato, L.M.C.
  • Maduro, A.R.
  • Carrelhas, A.A.D.
  • Henriques, J.C.C.
  • Ferreira, D.N.

Abstract

Self-rectifying impulse turbines are a popular alternative to the Wells turbine for oscillating-water-column wave energy converters. Self-rectifying impulse turbines have two sets of guide-vanes, one set placed symmetrically on each side of the rotor, instead of a single set as in unidirectional turbines. The efficiency of self-rectifying turbines with fixed guide-vanes is known to be severely affected by the large aerodynamic losses due to the inherent misalignment between the outflow from the rotor and the downstream guide-vanes. The biradial turbine is an advanced, more efficient, version of the impulse self-rectifying turbine, as compared with the conventional axial-flow type. The paper presents a new topology for the radially-set guide-vane system arranged into multiple, rather than simple, rows, aiming to increase the turbine efficiency by reducing the losses by aerodynamic outflow stalling at the exit guide-vane system while ensuring the required inflow deflection by the inlet guide vanes. The design method combines an evolutionary optimisation algorithm with cascade-flow CFD RANS calculations. Experimental results are presented to validate the design method and to assess the performance and flow-losses of the single and double-row guide-vane system configurations.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:216:y:2021:i:c:s0360544220322179
    DOI: 10.1016/j.energy.2020.119110
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    References listed on IDEAS

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    1. 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.
    2. 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).
    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).

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