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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
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Official URL: https://doi.org/10.1063/1.5083103
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 | ||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||
| Divisions: | Faculty of Science > 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 | ||||||
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| 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 | ||||||
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