Vortex wakes of birds: recent developments using digital particle image velocimetry in a wind tunnel
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/167070
- author
- Hedenström, Anders LU ; van Griethuijsen, L ; Rosén, Mikael LU and Spedding, G R
- organization
- publishing date
- 2006
- 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
- 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
- 2024-02-06 20:13:56
@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}}, keywords = {{added mass; bird flight; digital particle image; velocimetry; DPIV; vortex wakes; aerodynamics}}, language = {{eng}}, number = {{4}}, pages = {{535--549}}, publisher = {{Brill}}, 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}}, }