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Vortex wakes of birds: recent developments using digital particle image velocimetry in a wind tunnel

Hedenström, Anders LU ; van Griethuijsen, L ; Rosén, Mikael LU and Spedding, G R (2006) In Animal Biology 56(4). p.535-549
Abstract
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,... (More)
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. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
added mass, bird flight, digital particle image, velocimetry, DPIV, vortex wakes, aerodynamics
in
Animal Biology
volume
56
issue
4
pages
535 - 549
publisher
Brill Academic Publishers
external identifiers
  • wos:000243376200008
  • scopus:33845367219
ISSN
1570-7555
DOI
10.1163/157075606778967856
language
English
LU publication?
yes
id
bb608bf5-fa97-4c01-8063-661647e0f432 (old id 167070)
date added to LUP
2016-04-01 12:05:10
date last changed
2021-08-25 01:04:13
@article{bb608bf5-fa97-4c01-8063-661647e0f432,
  abstract     = {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.},
  author       = {Hedenström, Anders and van Griethuijsen, L and Rosén, Mikael and Spedding, G R},
  issn         = {1570-7555},
  language     = {eng},
  number       = {4},
  pages        = {535--549},
  publisher    = {Brill Academic Publishers},
  series       = {Animal Biology},
  title        = {Vortex wakes of birds: recent developments using digital particle image velocimetry in a wind tunnel},
  url          = {http://dx.doi.org/10.1163/157075606778967856},
  doi          = {10.1163/157075606778967856},
  volume       = {56},
  year         = {2006},
}