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Vortex wakes of bir...
Vortex wakes of birds: recent developments using digital particle image velocimetry in a wind tunnel
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- Hedenström, Anders (author)
- Lund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science
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van Griethuijsen, L (author)
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- Rosén, Mikael (author)
- Lund University,Lunds universitet,Biologiska institutionen,Naturvetenskapliga fakulteten,Department of Biology,Faculty of Science
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Spedding, G R (author)
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(creator_code:org_t)
- Brill, 2006
- 2006
- English.
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In: Animal Biology. - : Brill. - 1570-7555 .- 1570-7563. ; 56:4, s. 535-549
- Related links:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
Subject headings
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- A flying animal generates a trail of wake vortices that contain information about the time history and magnitude of aerodynamic forces developed on the wings and body. Methods for visualising and recording wake vortices have been developed, allowing quantitative measurements by digital particle image velocimetry (DPIV). Results from DPIV experiments in a wind tunnel are presented for four passerine species of differing size and morphology. The normalised vorticity and its integrated quantity, circulation (Gamma) both decline gradually with increasing flight speed. The measured circulations are successfully explained by a simple aerodynamic model where a normalised circulation, Gamma/Uc, represents half the time-averaged lift coefficient, which is > 2 at 4 m s(-1) for a thrush nightingale.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Keyword
- added mass
- bird flight
- digital particle image
- velocimetry
- DPIV
- vortex wakes
- aerodynamics
Publication and Content Type
- art (subject category)
- ref (subject category)
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