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Title
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Experimental study of the flow field induced by a resonating piezoelectric flapping wing
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Author
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Abstract
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| Flexible plate structures with integrated piezoelectric patches offer interesting possibilities when considered as actuation mechanisms for energy harvesting devices, cooling devices and propulsion devices of micro-aerial vehicles. Most of the studies reported in literature are based on the assumption of a 2D aerodynamic flow. However, the flow behind a finite span wing is significantly more complex than that of an infinite span wing. In order to corroborate this statement, the present experimental study contains high-speed particle image velocimetry measurements performed on a piezoelectric finite span wing oscillating in air, at 84.8 Hz. The paper focuses on the situation of low KeuleganCarpenter numbers (KC < 3). The dimensionless KC number describes the relative importance of the drag forces over inertia forces for objects that oscillate in a fluid flow at rest. The evolution of the unsteady vortex structures near the plate is characterized for different conditions. This allows a better understanding of the unsteady aerodynamics of flapping flight. The accomplished experimental data analysis has shown that the flow phenomena are strongly dependent on the KC values. |
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Language
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English
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Source (journal)
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Experiments in fluids. - Berlin
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Publication
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Berlin
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2013
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ISSN
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0723-4864
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DOI
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10.1007/S00348-013-1619-Y
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Volume/pages
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54
:11
(2013)
, p. 1-16
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ISI
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000326086000011
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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