Usefulness of inclined circular cylinders for designing ultra-wide bandwidth piezoelectric energy harvesters: Experiments and computational investigations
Usefulness of inclined circular cylinders for designing ultra-wide bandwidth piezoelectric energy harvesters: Experiments and computational investigations
This study proposes to change the inclination angle (α) of a circular cylinder with respect to oncoming flow in order to broaden the effective wind speed bandwidth of the piezoelectric energy harvester. Comprehensive wind tunnel experiments are conducted to investigate the energy harvesting characteristics of the system under different inclination angles. The experimental results demonstrate that compared to the conventional vortex-induced vibration piezoelectric energy harvester (VIVPEH), an appropriate inclined cylinder can broaden the effective wind speed range for the VIVPEH. It is experimentally shown that the inclined cylinder at α = 60° can reduce the threshold wind speed and broaden the effective wind speed bandwidth by more than 229%. In addition, inclined circular cylinders at α = 25°, 30°, 35°, 40°, and 45° can produce torsional vibration and high voltage output under high wind speed. Through frequency analysis and computational fluid dynamics (CFD) simulations, the influence mechanism and causes of torsional vibration are explored in detail. The results show that the axial flow will prevent the free shear layer from falling off and cause the force imbalance at the top and bottom of the inclined cylinder, resulting in a torsional vibration and a series of other phenomena. The appearance of the torsional vibration rapidly reduces the frequency of the conventional transverse vortex-induced vibration (VIV). The superposition of the transverse bending vibration and the torsional vibration within a certain wind speed range results in a high voltage output.
Inclined circular cylinder, Piezoelectric energy harvester, Torsional vibration, Ultra-wide bandwidth, Vortex-induced vibration
Wang, Junlei
7afcea11-129b-4a82-b572-95b443c2c643
Zhang, Chengyun
b88ca974-9527-4ccf-a26e-c10d9c02480a
Yurchenko, Daniil
51a2896b-281e-4977-bb72-5f96e891fbf8
Abdelkefi, Abdessattar
27f70fdc-8dcc-4345-be95-934c5ce417da
Zhang, Mingjie
f66521fc-7cb7-4992-ae05-7baa9fe12cc8
Liu, Huadong
c8f603de-88be-4ff8-8a0c-bae9f1442c86
15 January 2022
Wang, Junlei
7afcea11-129b-4a82-b572-95b443c2c643
Zhang, Chengyun
b88ca974-9527-4ccf-a26e-c10d9c02480a
Yurchenko, Daniil
51a2896b-281e-4977-bb72-5f96e891fbf8
Abdelkefi, Abdessattar
27f70fdc-8dcc-4345-be95-934c5ce417da
Zhang, Mingjie
f66521fc-7cb7-4992-ae05-7baa9fe12cc8
Liu, Huadong
c8f603de-88be-4ff8-8a0c-bae9f1442c86
Wang, Junlei, Zhang, Chengyun, Yurchenko, Daniil, Abdelkefi, Abdessattar, Zhang, Mingjie and Liu, Huadong
(2022)
Usefulness of inclined circular cylinders for designing ultra-wide bandwidth piezoelectric energy harvesters: Experiments and computational investigations.
Energy, 239, [122203].
(doi:10.1016/j.energy.2021.122203).
Abstract
This study proposes to change the inclination angle (α) of a circular cylinder with respect to oncoming flow in order to broaden the effective wind speed bandwidth of the piezoelectric energy harvester. Comprehensive wind tunnel experiments are conducted to investigate the energy harvesting characteristics of the system under different inclination angles. The experimental results demonstrate that compared to the conventional vortex-induced vibration piezoelectric energy harvester (VIVPEH), an appropriate inclined cylinder can broaden the effective wind speed range for the VIVPEH. It is experimentally shown that the inclined cylinder at α = 60° can reduce the threshold wind speed and broaden the effective wind speed bandwidth by more than 229%. In addition, inclined circular cylinders at α = 25°, 30°, 35°, 40°, and 45° can produce torsional vibration and high voltage output under high wind speed. Through frequency analysis and computational fluid dynamics (CFD) simulations, the influence mechanism and causes of torsional vibration are explored in detail. The results show that the axial flow will prevent the free shear layer from falling off and cause the force imbalance at the top and bottom of the inclined cylinder, resulting in a torsional vibration and a series of other phenomena. The appearance of the torsional vibration rapidly reduces the frequency of the conventional transverse vortex-induced vibration (VIV). The superposition of the transverse bending vibration and the torsional vibration within a certain wind speed range results in a high voltage output.
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Accepted/In Press date: 25 September 2021
e-pub ahead of print date: 27 September 2021
Published date: 15 January 2022
Additional Information:
Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No.: 51977196 ), China Postdoctoral Science Foundation ( 2020T130557 ), Henan Province Science Foundation for Youths ( 202300410422 ), and Young Talents of Henan Province ( 2021HYTP025 ).
Publisher Copyright:
© 2021 Elsevier Ltd
Keywords:
Inclined circular cylinder, Piezoelectric energy harvester, Torsional vibration, Ultra-wide bandwidth, Vortex-induced vibration
Identifiers
Local EPrints ID: 468988
URI: http://eprints.soton.ac.uk/id/eprint/468988
ISSN: 0360-5442
PURE UUID: 49f27354-4446-4e39-bbf7-160233b247b2
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Date deposited: 02 Sep 2022 19:10
Last modified: 17 Mar 2024 07:23
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Contributors
Author:
Junlei Wang
Author:
Chengyun Zhang
Author:
Daniil Yurchenko
Author:
Abdessattar Abdelkefi
Author:
Mingjie Zhang
Author:
Huadong Liu
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