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Modeling and performance estimation for L-shaped OWC wave energy converters with a theoretical correction for spring-like air compressibility

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  • Nguyen, Duy Tong
  • Chow, Yi-Chih
  • Lin, Chen-Chou

Abstract

The investigation of Oscillating Water Columns (OWC) has gained significant attention in recent years thanks to their resilient structural design, allowing them to withstand harsh environmental conditions. This study focuses on the L-shaped OWC (L-OWC) due to its excellent energy capture efficiency. It should be noted that air compressibility plays a significant role in the plenum chamber of the OWC, especially at full scale. The present paper proposes a scaling-rematched approach, facilitating the evaluation of hydrodynamic coefficients and the performance estimation with a theoretical correction for the unmatched scaling problem of spring-like air compressibility. The methodology is applied successfully to a model-scale L-OWC design, employing three-dimensional, incompressible-flow simulations combined with an impeller model. The present study reveals the hydrodynamic characteristics (advantages) of the L-OWC: small fluid damping coefficient and large added mass, and hence the possibility that the spring-like air compressibility can be used to raise the efficiency of power capturing. Furthermore, there exists an interval where the air compressibility has a positive effect on the performance, not only having a significantly longer span than that of the conventional OWC but also much more directly matching the period range of high energy potential found in the wave climate of Northeastern Taiwan waters.

Suggested Citation

  • Nguyen, Duy Tong & Chow, Yi-Chih & Lin, Chen-Chou, 2024. "Modeling and performance estimation for L-shaped OWC wave energy converters with a theoretical correction for spring-like air compressibility," Renewable Energy, Elsevier, vol. 237(PA).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pa:s0960148124015672
    DOI: 10.1016/j.renene.2024.121499
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    References listed on IDEAS

    as
    1. Chow, Yi-Chih & Chang, Yu-Chi & Chen, Da-Wei & Lin, Chen-Chou & Tzang, Shiaw-Yih, 2018. "Parametric design methodology for maximizing energy capture of a bottom-hinged flap-type WEC with medium wave resources," Renewable Energy, Elsevier, vol. 126(C), pages 605-616.
    2. López, I. & Pereiras, B. & Castro, F. & Iglesias, G., 2014. "Optimisation of turbine-induced damping for an OWC wave energy converter using a RANS–VOF numerical model," Applied Energy, Elsevier, vol. 127(C), pages 105-114.
    3. 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.
    4. 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.
    5. Elhanafi, Ahmed & Macfarlane, Gregor & Fleming, Alan & Leong, Zhi, 2017. "Scaling and air compressibility effects on a three-dimensional offshore stationary OWC wave energy converter," Applied Energy, Elsevier, vol. 189(C), pages 1-20.
    6. Dezhi Ning & Rongquan Wang & Chongwei Zhang, 2017. "Numerical Simulation of a Dual-Chamber Oscillating Water Column Wave Energy Converter," Sustainability, MDPI, vol. 9(9), pages 1-12, September.
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