This study aims to expand the aeroelastic unstable range of a circular cylinder for improving the efficiency of a vortex-induced vibration (VIV)-based wind energy harvester. The kinetic energy of the harvester is provided by flow-induced vibration of a circular cylinder. Two small-diameter cylindrical rods were attached on two sides of the circular cylinder parallel to the cylinder axis and symmetrical to the stagnation line at a series of circumferential locations. This was inspired by rain-wind-induced vibrations of stay-cables of cable-stayed bridges. It was found that attaching two small-diameter cylindrical rods at the circumferential location θ = 60° significantly expands the aeroelastic unstable range for the circular cylinder. The wind energy harvester with this configuration harnesses the wind energy beyond the VIV onset wind speed and is sustained over the range of wind speed. Therefore, this configuration possesses a dramatic superiority over a plain circular cylinder as the kinetic source of a wind energy harvester.
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7 November 2016
Research Article|
November 08 2016
Aerodynamic modification to a circular cylinder to enhance the piezoelectric wind energy harvesting
Gang Hu;
Gang Hu
1CLP Power Wind/Wave Tunnel Facility,
Hong Kong University of Science and Technology
, Hong Kong, China
2Center for Infrastructure Engineering,
Western Sydney University
, Penrith, New South Wales, 2751, Australia
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K. T. Tse;
K. T. Tse
3Department of Civil and Environmental Engineering,
Hong Kong University of Science and Technology
, Hong Kong, China
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K. C. S. Kwok;
K. C. S. Kwok
2Center for Infrastructure Engineering,
Western Sydney University
, Penrith, New South Wales, 2751, Australia
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Jie Song;
4Department of Engineering Mechanics, School of Civil Engineering,
Wuhan University
, Wuhan, China
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Yuan Lyu
Yuan Lyu
3Department of Civil and Environmental Engineering,
Hong Kong University of Science and Technology
, Hong Kong, China
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a)
Author to whom correspondence should be addressed. Electronic mail: jsongaa@connect.ust.hk
Appl. Phys. Lett. 109, 193902 (2016)
Article history
Received:
July 17 2016
Accepted:
October 28 2016
Citation
Gang Hu, K. T. Tse, K. C. S. Kwok, Jie Song, Yuan Lyu; Aerodynamic modification to a circular cylinder to enhance the piezoelectric wind energy harvesting. Appl. Phys. Lett. 7 November 2016; 109 (19): 193902. https://doi.org/10.1063/1.4967497
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