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Wake analysis of aerodynamic components for the glide envelope of a jackdaw (Corvus monedula)

KleinHeerenbrink, Marco LU ; Warfvinge, Kajsa LU and Hedenström, Anders LU (2016) In Journal of Experimental Biology 219(10). p.1572-1581
Abstract

Gliding flight is a relatively inexpensive mode of flight used by many larger bird species, where potential energy is used to cover the cost of aerodynamic drag. Birds have great flexibility in their flight configuration, allowing them to control their flight speed and glide angle. However, relatively little is known about how this flexibility affects aerodynamic drag. We measured the wake of a jackdaw (Corvus monedula) gliding in a wind tunnel, and computed the components of aerodynamic drag from the wake. We found that induced drag was mainly affected by wingspan, but also that the use of the tail has a negative influence on span efficiency. Contrary to previous work, we found no support for the separated primaries being used in... (More)

Gliding flight is a relatively inexpensive mode of flight used by many larger bird species, where potential energy is used to cover the cost of aerodynamic drag. Birds have great flexibility in their flight configuration, allowing them to control their flight speed and glide angle. However, relatively little is known about how this flexibility affects aerodynamic drag. We measured the wake of a jackdaw (Corvus monedula) gliding in a wind tunnel, and computed the components of aerodynamic drag from the wake. We found that induced drag was mainly affected by wingspan, but also that the use of the tail has a negative influence on span efficiency. Contrary to previous work, we found no support for the separated primaries being used in controlling the induced drag. Profile drag was of similar magnitude to that reported in other studies, and our results suggest that profile drag is affected by variation in wing shape. For a folded tail, the body drag coefficient had a value of 0.2, rising to above 0.4 with the tail fully spread, which we conclude is due to tail profile drag.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aerodynamics, Biomechanics, Gliding flight, Particle image velocimetry, PIV, Wind tunnel, Wing morphology
in
Journal of Experimental Biology
volume
219
issue
10
pages
10 pages
publisher
The Company of Biologists Ltd
external identifiers
  • scopus:84982947647
  • wos:000376118500023
ISSN
0022-0949
DOI
10.1242/jeb.132480
language
English
LU publication?
yes
id
e1709212-2312-4a27-a6d9-43bc5b359aac
date added to LUP
2016-10-07 13:40:18
date last changed
2017-07-02 04:54:48
@article{e1709212-2312-4a27-a6d9-43bc5b359aac,
  abstract     = {<p>Gliding flight is a relatively inexpensive mode of flight used by many larger bird species, where potential energy is used to cover the cost of aerodynamic drag. Birds have great flexibility in their flight configuration, allowing them to control their flight speed and glide angle. However, relatively little is known about how this flexibility affects aerodynamic drag. We measured the wake of a jackdaw (Corvus monedula) gliding in a wind tunnel, and computed the components of aerodynamic drag from the wake. We found that induced drag was mainly affected by wingspan, but also that the use of the tail has a negative influence on span efficiency. Contrary to previous work, we found no support for the separated primaries being used in controlling the induced drag. Profile drag was of similar magnitude to that reported in other studies, and our results suggest that profile drag is affected by variation in wing shape. For a folded tail, the body drag coefficient had a value of 0.2, rising to above 0.4 with the tail fully spread, which we conclude is due to tail profile drag.</p>},
  author       = {KleinHeerenbrink, Marco and Warfvinge, Kajsa and Hedenström, Anders},
  issn         = {0022-0949},
  keyword      = {Aerodynamics,Biomechanics,Gliding flight,Particle image velocimetry,PIV,Wind tunnel,Wing morphology},
  language     = {eng},
  month        = {05},
  number       = {10},
  pages        = {1572--1581},
  publisher    = {The Company of Biologists Ltd},
  series       = {Journal of Experimental Biology},
  title        = {Wake analysis of aerodynamic components for the glide envelope of a jackdaw (Corvus monedula)},
  url          = {http://dx.doi.org/10.1242/jeb.132480},
  volume       = {219},
  year         = {2016},
}