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Acoustic noise emission of air turbines for wave energy conversion: Assessment and analysis

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  • Henriques, J.C.C.
  • Gato, L.M.C.
  • La Sala, V.
  • Carrelhas, A.A.D.

Abstract

The oscillating-water-column (OWC) system is one of the most developed wave energy conversion technologies, and several prototypes have been deployed and tested on the sea. Noise emission is essential to this technology’s long-term environmental impact assessment. The power take-off system of an OWC comprises a self-rectifying air turbine that directly drives an electrical generator. The paper compares the noise emission of a biradial turbine with that of a Wells turbine. The noise emission of the biradial turbine was measured at the Instituto Superior Técnico variable-flow test rig, while the Wells turbine data were collected in the literature. Acoustic measurement procedures followed the guidelines of the ISO 3746 Standard. A definition of specific noise level is used to compare the noise emission from geometrically similar air turbines or other air turbines performing the same duty. The results show that the noise levels of the biradial turbine are significantly lower than those of the Wells turbine at off-design conditions for the same pneumatic power.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:212:y:2023:i:c:p:897-907
    DOI: 10.1016/j.renene.2023.05.078
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    References listed on IDEAS

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    1. 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).
    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. Correia da Fonseca, F.X. & Henriques, J.C.C. & Gato, L.M.C. & Falcão, A.F.O., 2019. "Oscillating flow rig for air turbine testing," Renewable Energy, Elsevier, vol. 142(C), pages 373-382.
    4. 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).
    5. 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).
    6. 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).
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