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Oscillating flow rig for air turbine testing

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  • Correia da Fonseca, F.X.
  • Henriques, J.C.C.
  • Gato, L.M.C.
  • Falcão, A.F.O.

Abstract

Oscillating water column (OWC) devices equipped with an air turbine are the most extensively studied and possibly the most reliable wave energy converters (WEC). Self-rectifying air turbines are usually employed, being the key element of the power-take-off system. Experimental testing the air turbine in realistic operating conditions is a fundamental step in turbine and WEC development. These turbines are, by definition, operating under oscillating airflows. The present paper describes the development of a novel test-rig designed to test self-rectifying air turbines under both steady and variable unidirectional airflows, and subsequent demonstration tests performed on an axial-flow impulse turbine. A real-time hardware-in-the-loop flow controller was implemented, providing the means to not only experimentally characterise the turbine's performance under realistic wave conditions, but, as importantly, to develop new advanced turbine-generator control strategies that further increase overall efficiency and survivability. Results show that a unidirectional oscillating-flow test-rig with a calibrated fan and fast-actuating valve system can adequately reproduce airflows that are characteristic of an OWC air turbine's operational regime. The hardware-in-the-loop simulator implemented in an oscillating-flow test-rig appears as an innovative, integrated solution for turbine testing in realistic operating flow conditions, but in a laboratory-controlled environment at a small fraction of the costs.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:142:y:2019:i:c:p:373-382
    DOI: 10.1016/j.renene.2019.04.124
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    References listed on IDEAS

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    12. Henriques, J.C.C. & Portillo, J.C.C. & Gato, L.M.C. & Gomes, R.P.F. & Ferreira, D.N. & Falcão, A.F.O., 2016. "Design of oscillating-water-column wave energy converters with an application to self-powered sensor buoys," Energy, Elsevier, vol. 112(C), pages 852-867.
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    Cited by:

    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. & Falcão, A.F.O. & Henriques, J.C.C., 2021. "Control law design for the air-turbine-generator set of a fully submerged 1.5 MW mWave prototype. Part 2: Experimental validation," Renewable Energy, Elsevier, vol. 171(C), pages 1002-1013.
    3. 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).

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