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Sensitivity of OWC performance to air compressibility

Author

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  • López, I.
  • Carballo, R.
  • Taveira-Pinto, F.
  • Iglesias, G.

Abstract

Air compressibility is often neglected in experimental work due to practical difficulties, even though it is known to affect the performance of OWC wave energy converters. The key question, of course, is to what extent. In this work the impact of air compressibility on the capture width ratio is thoroughly quantified by means of a comprehensive experimental campaign, with no fewer than 330 tests encompassing a wide range of wave conditions and levels of turbine-induced damping, and two experimental set-ups: one designed to account for air compressibility, the other to neglect it. This approach is complemented with the use of the RANS-based CFD model OpenFOAM® to calibrate the pressure-vs-flowrate curves, which enables the flowrate to be determined based on the pressure drop measurements from the physical model. We find that the errors that derive from disregarding air compressibility may lead to either under- or over-predictions of power output, and are highly dependent on the operating conditions, more specifically the wave conditions (sea state) and turbine-induced damping.

Suggested Citation

  • López, I. & Carballo, R. & Taveira-Pinto, F. & Iglesias, G., 2020. "Sensitivity of OWC performance to air compressibility," Renewable Energy, Elsevier, vol. 145(C), pages 1334-1347.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:1334-1347
    DOI: 10.1016/j.renene.2019.06.076
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    Cited by:

    1. Cui, Lin & Zheng, Siming & Zhang, Yongliang & Miles, Jon & Iglesias, Gregorio, 2021. "Wave power extraction from a hybrid oscillating water column-oscillating buoy wave energy converter," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    2. Kharkeshi, Behrad Alizadeh & Shafaghat, Rouzbeh & Jahanian, Omid & Alamian, Rezvan & Rezanejad, Kourosh, 2022. "Experimental study of an oscillating water column converter to optimize nonlinear PTO using genetic algorithm," Energy, Elsevier, vol. 260(C).
    3. Falcão, António F.O. & Henriques, João C.C. & Gomes, Rui P.F. & Portillo, Juan C.C., 2022. "Theoretically based correction to model test results of OWC wave energy converters to account for air compressibility effect," Renewable Energy, Elsevier, vol. 198(C), pages 41-50.
    4. Zhang, Yongkuang & Zhou, Yu & Chen, Weixing & Zhang, Weidong & Gao, Feng, 2022. "Design, modeling and numerical analysis of a WEC-Glider (WEG)," Renewable Energy, Elsevier, vol. 188(C), pages 911-921.
    5. Iván López & Rodrigo Carballo & David Mateo Fouz & Gregorio Iglesias, 2021. "Design Selection and Geometry in OWC Wave Energy Converters for Performance," Energies, MDPI, vol. 14(6), pages 1-18, March.
    6. Irene Simonetti & Andrea Esposito & Lorenzo Cappietti, 2022. "Experimental Proof-of-Concept of a Hybrid Wave Energy Converter Based on Oscillating Water Column and Overtopping Mechanisms," Energies, MDPI, vol. 15(21), pages 1-20, October.
    7. Zhan, Jie-Min & Fan, Qing & Hu, Wen-Qing & Gong, Ye-Jun, 2020. "Hybrid realizable k−ε/laminar method in the application of 3D heaving OWCs," Renewable Energy, Elsevier, vol. 155(C), pages 691-702.
    8. Chen, Jing & Wen, Hongjie & Wang, Yongxue & Wang, Guoyu, 2021. "A correlation study of optimal chamber width with the relative front wall draught of onshore OWC device," Energy, Elsevier, vol. 225(C).
    9. Ayrton Alfonso Medina Rodríguez & Gregorio Posada Vanegas & Rodolfo Silva Casarín & Edgar Gerardo Mendoza Baldwin & Beatriz Edith Vega Serratos & Felipe Ernesto Puc Cutz & Enrique Alejandro Mangas Che, 2022. "Experimental Investigation of the Hydrodynamic Performance of Land-Fixed Nearshore and Onshore Oscillating Water Column Systems with a Thick Front Wall," Energies, MDPI, vol. 15(7), pages 1-26, March.
    10. Zhang, Yongkuang & Huang, Hao & Gao, Feng & Chen, Weixing, 2023. "Cable-driven power take-off for WEC-glider: Modeling, simulation, experimental study, and application," Energy, Elsevier, vol. 282(C).
    11. Guo, Bingyong & Ringwood, John V., 2021. "Geometric optimisation of wave energy conversion devices: A survey," Applied Energy, Elsevier, vol. 297(C).
    12. Martinez, A. & Murphy, L. & Iglesias, G., 2023. "Evolution of offshore wind resources in Northern Europe under climate change," Energy, Elsevier, vol. 269(C).
    13. 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.
    14. Zhu, Guixun & Samuel, John & Zheng, Siming & Hughes, Jason & Simmonds, David & Greaves, Deborah, 2023. "Numerical investigation on the hydrodynamic performance of a 2D U-shaped Oscillating Water Column wave energy converter," Energy, Elsevier, vol. 274(C).
    15. Zhou, Yu & Ning, Dezhi & Liang, Dongfang & Cai, Shuqun, 2021. "Nonlinear hydrodynamic analysis of an offshore oscillating water column wave energy converter," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
    16. 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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