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New Strategy on Power Absorption of a Concentric Two-Body Wave Energy Converter

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  • Senthil Kumar Natarajan

    (Department of Ocean System Engineering, Jeju National University, Jeju 690-756, Republic of Korea)

  • Ilhyoung Cho

    (Department of Ocean System Engineering, Jeju National University, Jeju 690-756, Republic of Korea)

Abstract

The wave energy converter (WEC) system, which extracts electricity through the relative heave motion of two concentric cylinders, comprises an inner cylinder and a torus-type outer cylinder sliding along the inner cylinder. To maximize the relative heave motion between two cylinders, the natural frequencies of the two cylinders must be precisely tuned to resonate and be situated on each side of the peak frequency of the wave spectrum. However, the demerit of this strategy is that it demands a deep draft of each cylinder for tuning, and a large-scale PTO damping device is necessary for mechanical power amplified by resonance. As an alternative to efficient and stable WECs, we adopt a new strategy in which the outer cylinder follows the incoming waves and the motion of the inner one is restricted to be minimal using a heave disk. The viscous damping due to formation of vortices at the disk edge is realized by the drag force in the Morison equation. The developed hydrodynamic model of two-body WEC based on a matched eigenfunction expansion method (MEEM) is applied to irregular waves characterized by significant wave height and peak period. It is found that the present two-body WEC with heave disk produces wave energy stably across a wide range of wave frequencies compared to the previous two-body WECs using resonance.

Suggested Citation

  • Senthil Kumar Natarajan & Ilhyoung Cho, 2023. "New Strategy on Power Absorption of a Concentric Two-Body Wave Energy Converter," Energies, MDPI, vol. 16(9), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:9:p:3791-:d:1135719
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    References listed on IDEAS

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    1. Jin, Chungkuk & Kang, HeonYong & Kim, MooHyun & Cho, Ilhyoung, 2020. "Performance estimation of resonance-enhanced dual-buoy wave energy converter using coupled time-domain simulation," Renewable Energy, Elsevier, vol. 160(C), pages 1445-1457.
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    Cited by:

    1. Senthil Kumar Natarajan & Il Hyoung Cho, 2023. "Cost-Effective Optimization of an Array of Wave Energy Converters in Front of a Vertical Seawall," Energies, MDPI, vol. 17(1), pages 1-21, December.

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