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High-speed stereo D...
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Hedenström, AndersLund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science
(författare)
High-speed stereo DPIV measurement of wakes of two bat species flying freely in a wind tunnel
- Artikel/kapitelEngelska2009
Förlag, utgivningsår, omfång ...
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2009-02-28
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Springer Science and Business Media LLC,2009
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LIBRIS-ID:oai:lup.lub.lu.se:d92bb662-5858-4af3-bafa-55c24d3f07e2
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https://lup.lub.lu.se/record/1426355URI
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https://doi.org/10.1007/s00348-009-0634-5DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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Previous studies on wake flow visualization of live animals using DPIV have typically used low repetition rate lasers and 2D imaging. Repetition rates of around 10 Hz allow similar to 1 image per wingbeat in small birds and bats, and even fewer in insects. To accumulate data representing an entire wingbeat therefore requires the stitching-together of images captured from different wingbeats, and at different locations along the wing span for 3D-construction of wake topologies. A 200 Hz stereo DPIV system has recently been installed in the Lund University wind tunnel facility and the high-frame rate can be used to calculate all three velocity components in a cube, whose third dimension is constructed using the Taylor hypothesis. We studied two bat species differing in body size, Glossophaga soricina and Leptonycteris curasoa. Both species shed a tip vortex during the downstroke that was present well into the upstroke, and a vortex of opposite sign to the tip vortex was shed from the wing root. At the transition between upstroke/downstroke, a vortex loop was shed from each wing, inducing an upwash. Vorticity iso-surfaces confirmed the overall wake topology derived in a previous study. The measured dimensionless circulation, I"/Uc, which is proportional to a wing section lift coefficient, suggests that unsteady phenomena play a role in the aerodynamics of both species.
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Muijres, FlorianLund University,Lunds universitet,Evolutionär ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Evolutionary ecology,Department of Biology,Faculty of Science(Swepub:lu)teor-fim
(författare)
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von Busse, R.
(författare)
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Johansson, L. C.
(författare)
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Winter, Y.
(författare)
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Spedding, G. R.
(författare)
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Evolutionär ekologiBiologiska institutionen
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Experiments in Fluids: Springer Science and Business Media LLC46:5, s. 923-9321432-11140723-4864
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