Simulation and Experiments on Optimization of Vortex-Induced Vibration Power Generation System Based on Side-by-Side Double Blunt Bodies

Liguo Fan, Guoqiang Liu, Xianjin Song, Ce Xiang, Jiacheng Wei and Hui Xia ()
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Liguo Fan: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Guoqiang Liu: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Xianjin Song: School of Electric Power and Architecture, Shanxi University, Taiyuan 030006, China
Ce Xiang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Jiacheng Wei: School of Electric Power and Architecture, Shanxi University, Taiyuan 030006, China
Hui Xia: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2024, vol. 17, issue 21, 1-23

Abstract: In order to improve the utilization efficiency of converting low-flow current energy into electric energy for Reynolds number 10,000 ≤ Re ≤ 40,000, this paper proposes a vortex-induced vibration power generation system based on a side-by-side double blunt body. In this system, the side-by-side double blunt body structure is used in the current energy capture part to enhance the collection of low-flow current energy; the permanent magnet linear motor is used in the electric energy conversion part to improve the efficiency of electric energy conversion; and a laboratory device is constructed for testing. The effects of the blunt body structure parameters and the center spacing ratio on the energy harvesting performance of the system are qualitatively explained by constructing a simulation model. Compared with the single blunt body energy capture structure, the side-by-side double blunt body structure increases the vibration amplitude by 1.04 times and the lift by 1.14 times at the center spacing S/D = 2.4. Meanwhile, energy harvesting can be realized at a lower flow velocity, increasing the vortex-induced vibration’s energy capture range. Finally, the power generation system was experimentally verified in the laboratory, and the results showed that the vibration amplitude of the double blunt body structure was increased by 1.12 times compared to the single blunt body. The maximum output power of the generator is 10.55 W when the water velocity is 0.7 m/s. The energy conversion efficiency of the power generation system can reach a maximum of 52.93%, which is 12.33% higher than that of a single blunt body structure, which proves that the system has a higher power conversion efficiency than that of a conventional single conversion system.

Keywords: low-velocity ocean current energy; vortex-induced vibration; energy conversion system; side-by-side arrangement; flexible cylinders; permanent magnet linear motors (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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