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Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter

Author

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  • Hong-Goo Kang

    (Department of Mechanical Engineering, Graduate School, Korea Maritime and Ocean University, Busan 49122, Korea
    Research and Development Center, Foresys Co., Ltd., Seoul 04048, Korea)

  • Young-Ho Lee

    (Division of Mechanical Engineering, College of Engineering, Korea Maritime and Ocean University, Busan 49122, Korea)

  • Chan-Joo Kim

    (Research and Development Center, Foresys Co., Ltd., Seoul 04048, Korea)

  • Hyo-Dong Kang

    (Research and Development Center, Foresys Co., Ltd., Seoul 04048, Korea)

Abstract

A cross-flow air turbine, which is a self-rectifying, air-driven turbine, was designed and proposed for the power take-off (PTO) system of an oscillating water column (OWC) wave energy converter (WEC). To predict the complicated non-linear behavior of the air turbine in the OWC, numerical and experimental investigations were accomplished. The geometries of the nozzle and the rotor of the turbine were optimized under steady-flow conditions, and the performance analysis of the model in bi-directional flows was conducted by commercial computational fluid dynamics (CFD) code ANSYS CFX. Experimentation on the full-scale turbine was then undertaken in a cylindrical-type wave simulator that generated reciprocating air flows, to validate the numerical model. The optimized model had a peak cycle-averaged efficiency of 0.611, which is 1.7% larger than that of the reference model, and a significantly improved band width with an increase in flow coefficients. Under reciprocating-flow conditions, the optimized model had a more improved operating range with high efficiency compared to the performance derived from the steady-flow analysis, but the peak cycle-averaged efficiency was decreased by 4.3%. The numerical model was well matched to the experimental results with an averaged difference of 3.5%. The proposed optimal design having structural simplicity with high performance can be a good option to efficiently generate electricity.

Suggested Citation

  • Hong-Goo Kang & Young-Ho Lee & Chan-Joo Kim & Hyo-Dong Kang, 2022. "Design Optimization of a Cross-Flow Air Turbine for an Oscillating Water Column Wave Energy Converter," Energies, MDPI, vol. 15(7), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2444-:d:780246
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    References listed on IDEAS

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