Piezoelectric Energy Harvesting From Fluid Flow
Item
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Title
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Piezoelectric Energy Harvesting From Fluid Flow
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Identifier
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d_2009_2013:296e67e8638a:11570
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identifier
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12109
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Creator
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Akaydin, Huseyin Dogus,
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Contributor
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Yiannis Andreopoulos | Niell Elvin
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Date
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2012
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Language
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English
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Publisher
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City University of New York.
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Subject
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Mechanical engineering | Aerospace engineering | Energy | aeroelectromechanics | energy harvesting | flow induced vibrations | fluid flow | piezoelectric | wind energy
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Abstract
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The conversion of the kinetic energy of a fluid into electrical energy through flow-induced vibrations on piezoelectric structures is investigated. "Aeroelectromechanics" of flow-powered piezoelectric harvesters is introduced, the efficiency components are delineated, and the figures of merit are defined. Wind tunnel tests were performed on two kinds of harvesters: i) A cantilevered piezoelectric beam in the wake of a circular cylinder, ii) A cantilevered piezoelectric beam carrying a tip mass on its free end. The comparison of the two revealed the prime effect of aeroelastic efficiency in total efficiency. A semi-analytical model to account for strain transfer from a passive substrate to a piezoelectric patch through an elastic bonding layer was developed. It was shown that, under certain conditions, the electric output of the piezoelectric harvesters can be predicted based on strain measurements on test models built without using piezoelectric materials. The potential of turbulent boundary layers for energy harvesting was also investigated. Two flexible piezoelectric beams of different lengths were tested at various distances off the wall of wind tunnel at different flow speeds. It was found out that the power output is maximal when the beam is within a certain wall-distance region inside the boundary layer, and that the size of this region is larger for the shorter beam. The interaction of a flexible piezoelectric beam with vortex rings was another topic investigated. Time-resolved PIV images were taken synchronously with strain, base-force and piezoelectric voltage data as a vortex ring travels over a piezoelectric beam. The dynamic tip deflection of the beam estimated using the PIV data in a potential flow solution was found comparable to the measured tip deflection. In addition to the experimental work, a computational framework for modeling aeroelectromechanical interactions was developed by integrating an electrical circuit analysis code to a flow simulation program through external scripting. The framework was applied for the case of a flexible piezoelectric beam in the wake of a cylinder. A reasonable agreement was obtained between the computer simulations and the experimental results.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Engineering
