Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session D22: Biological Fluid Dynamics: Bird and Insect Wings
2:30 PM–4:40 PM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B310
Chair: Roi Gurka, Coastal Carolina University
Abstract ID: BAPS.2018.DFD.D22.2
Abstract: D22.00002 : Model of Bird Alula Generates Arching Vortex on Finite Wings
2:43 PM–2:56 PM
Presenter:
Thomas I Linehan
(University of Florida)
Authors:
Thomas I Linehan
(University of Florida)
Kamran Mohseni
(University of Florida)
The inimitable maneuvering capability of birds at high angles of attack is due in part to a miniature collection of feathers located at the bird's wrist termed the alula. The believed aerodynamic benefit of the alula stems from the vortex that it generates when deflected from the wing plane which facilitates the reattachment of flow over the wing. Further understanding of these physics of the alula specifically in the context of finite wings involving complex three-dimensional flow is needed to gauge its use in real world engineering applications. Towards this end, direct force/moment measurements alongside surface oil flow visualizations are conducted in a wind tunnel for which the alula and wing are modeled as rigid flat plates. Results indicate that the high-lift benefit of the alula stems from the formation of a vortex that arches from the leading edge of the wing, at the root of the deflected alula, toward the wing's side edge. The lift enhancement attributed to the alula increases as the alula is placed further from the wing's side edge until a critical distance for which the arching vortex is lost and lift enhancement is subsequently reduced.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.D22.2
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700