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Low-Grade Flow Energy Harvesting by Low-Mass-Ratio Oscillating Bent Plate

Author

Listed:
  • Wei Jiang

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Fan Wu

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Ziyue Mei

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Rui Shi

    (School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China)

  • Danmei Xie

    (Key Laboratory of Hydraulic Machinery Transients (MOE), Wuhan University, Wuhan 430072, China)

Abstract

Low-grade renewable energy possesses large reserves and a wide distribution in the environment, but it is far from fully exploited due to the high cost–income ratio when using traditional convertors. A fluid-induced-vibration-based flow energy convertor with a low-cost bent plate as an oscillator is proposed to achieve better energy converting performance for low-grade flow energy conversion. The energy extraction performance and dynamic response of the bent plate are assessed numerically. The results demonstrate that the prescribed single-DOF (degree of freedom) bent plate can reach the maximum efficiency of 29.6% and power coefficient of 2.36 at the relative plunging amplitude of 3.5, while the double-DOF bent plate achieves a maximum efficiency of 37.3% and power coefficient of 1.42 at a smaller amplitude of 1.4. It is discovered that the adoption of pitching motion can help to control the variation pattern of the effective AOA (angle of attack), while the camber of the bent plate also regulates the effective AOA from the geometrical respect. The FIV-based single-DOF convertor can achieve an energy converting efficiency of 29.3% and approach the ideal sinusoidal motion trajectory closely, indicating that the optimal active motion mode can be realized by the passive motion mode with the appropriate choice of the dynamic parameters.

Suggested Citation

  • Wei Jiang & Fan Wu & Ziyue Mei & Rui Shi & Danmei Xie, 2022. "Low-Grade Flow Energy Harvesting by Low-Mass-Ratio Oscillating Bent Plate," Energies, MDPI, vol. 15(5), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1606-:d:755393
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    References listed on IDEAS

    as
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