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A galloping energy harvester with flow attachment

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Harvey, Sam, Khovanov, Igor A. and Denissenko, Petr (2019) A galloping energy harvester with flow attachment. Applied Physics Letters, 114 (10). 104103. doi:10.1063/1.5083103 ISSN 0003-6951.

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Official URL: https://doi.org/10.1063/1.5083103

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Abstract

Aeroelastic energy harvesters are a promising technology for powering wireless sensors and microelectromechanical systems. In this letter, we present a harvester inspired by the trembling of aspen leaves in barely noticeable winds. The galloping energy harvester, a curved blade oriented perpendicular to the flow, is capable of producing self-sustained oscillations at uncharacteristically low wind speeds. The dynamics of the harvesting system are studied experimentally and compared to a lumped parameter model. Numerical simulations quantitatively describe the experimentally observed dynamic behaviour. Flow visualisation is performed to investigate the patterns generated by the device. Dissimilar to many other galloping harvester designs, the flow is found to be attached at the rear surface of the blade when the blade is close to its zero displacement position, hence acting more closely to aerofoils rather than to conventionally used bluff bodies. Simulations of the device combined with a piezoelectric harvesting mechanism predict higher power output than that of a device with the square prism.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH): Energy harvesting, Wireless sensor networks
Journal or Publication Title: Applied Physics Letters
Publisher: American Institute of Physics
ISSN: 0003-6951
Official Date: 14 March 2019
Dates:
DateEvent
14 March 2019Published
20 January 2019Accepted
Volume: 114
Number: 10
Article Number: 104103
DOI: 10.1063/1.5083103
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 25 March 2019
Date of first compliant Open Access: 27 March 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N509796/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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