The near wake of a freely flying European starling

From National Research Council Canada

DOIResolve DOI: http://doi.org/10.1063/1.4807064
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Name affiliation
  1. National Research Council Canada. Aerospace
TypeArticle
Journal titlePhysics of Fluids
ISSN1070-6631
1089-7666
Volume25
Issue5
Article number051902
Abstract
The wake of a freely flying European starling (Sturnus vulgaris) has been measured using high speed, time-resolved, particle image velocimetry, simultaneously with high speed cameras which imaged the bird. These have been used to generate vector maps that can be associated with the bird's location and wing configuration in the wind tunnel. Time series of measurements have been expressed as composite wake plots which depict segments of the wing beat cycle for various spanwise locations in the wake. Measurements indicate that downwash is not produced during the upstroke, suggesting that the upstroke does not generate lift. As well, the wake velocities imply the presence of streamwise vortical structures, in addition to tip vortices. These two characteristics indicate similarities between the wake of a bird and the wake of a bat, which may be general features of the wakes of flapping wings.
Publication date
PublisherAIP
LanguageEnglish
Peer reviewedYes
NPARC number23001920
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Record identifier8f6933e6-f7e7-4f8c-ac8a-a8f9822e8a66
Record created2017-05-25
Record modified2017-05-25
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