Numerical and experimental studies of energy harvesting driven by vortex-induced vibration (VIV) are currently focused on arranging the energy-captured structure in a uniform incoming flow at a certain depth, ignoring the effect of the free surface on VIV. The fluid–structure coupling effect can be enhanced when a column-group structure with rigid connection is arranged under uniform flow, which is helpful for the structure to concentrate hydrokinetic energy from low-velocity water flow. In this paper, a staggered arrangement of a four-cylinder oscillator with rigid connections is proposed as the energy converter, and the fluid–solid interaction numerical method is carried out to simulate the VIV of the four-cylinder structure under single-phase flow and free surfaces. In U* = 2–16 (flow velocity U = 0.16–1.28 m/s), the results of the energy harvesting magnitude, efficiency, and density of the four-cylinder oscillator under the arrangement depth ratios S* = 2, S* = 3, S* = 4, and S* = 5 are compared with the results obtained in the single-phase flow. It was found that the column-group structure has a broader resonance range of VIV in single-phase flows than a single cylinder and can capture more hydrokinetic energy concentratedly from low-velocity flow. The VIV responses of the four-cylinder oscillator are suppressed at low submergence depths with a narrower resonance range, and its captured energy is reduced. In contrast, at high submergence depth ratio S*, the VIV responses are not suppressed obviously by the free surface. The magnitude of captured energy, energy-harvesting efficiency, and density of the four-cylinder structure are basically consistent with the results obtained in single-phase flow at S* = 5.
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November 2022
Research Article|
November 07 2022
The effects of submergence depth on energy harvesting from the VIV of a four-cylinder oscillator with rigid connection
Tao Yang
;
Tao Yang
(Conceptualization, Project administration)
1
Department of Energy and Power Engineering, Kunming University of Science and Technology
, Kunming 650093, Yunan Province, China
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Zhumei Luo
;
Zhumei Luo
a)
(Methodology, Resources, Supervision)
1
Department of Energy and Power Engineering, Kunming University of Science and Technology
, Kunming 650093, Yunan Province, China
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Fengrong Yu;
Fengrong Yu
a)
(Visualization, Writing – original draft)
1
Department of Energy and Power Engineering, Kunming University of Science and Technology
, Kunming 650093, Yunan Province, China
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Jun Li;
Jun Li
(Project administration, Software)
1
Department of Energy and Power Engineering, Kunming University of Science and Technology
, Kunming 650093, Yunan Province, China
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Suoming Gao
Suoming Gao
(Investigation, Project administration)
2
Shenzhen Water Planning & Design Institute Company Limited
, Kunming 650032, China
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J. Renewable Sustainable Energy 14, 064501 (2022)
Article history
Received:
July 13 2022
Accepted:
October 02 2022
Citation
Tao Yang, Zhumei Luo, Fengrong Yu, Jun Li, Suoming Gao; The effects of submergence depth on energy harvesting from the VIV of a four-cylinder oscillator with rigid connection. J. Renewable Sustainable Energy 1 November 2022; 14 (6): 064501. https://doi.org/10.1063/5.0109454
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