Suscripción a Biblioteca: Guest
TSFP DL Home Archivos Comité Ejecutivo

A CASE STUDY OF UNSTEADY WINGS: THE WAKE OF A FREELY FLYING EUROPEAN STARLING (STURNUS VULGARIS)

Adam J. Kirchhefer
Department of Mechanical and Materials Engineering, The University of Western Ontario London, Ontario, Canada

Daniel Floryan
Department of Mechanical and Materials Engineering, The University of Western Ontario London, Ontario, Canada; Mechanical and Aerospace Engineering Princeton University Princeton, NJ 08544, USA

Wayne Bezner-Kerr
Department of Biology, The University of Western Ontario London, Ontario, Canada

Chris G. Guglielmo
Department of Biology, The University of Western Ontario London, Ontario, Canada

Gregory A. Kopp
Boundary Layer Wind Tunnel Laboratory and Advanced Fluid Mechanics Research Group Faculty of Engineering Science, University of Western Ontario, London Ontario, N6A 5B9 Canada

Roi Gurka
Department of Mechanical Engineering The Johns Hopkins University Baltimore, MD, 21218, USA; Boundary Layer Wind Tunnel Laboratory Faculty of Engineering, University of Western Ontario London, Ontario, N6A 5B9, Canada; Ben Gurion University, Israel

Sinopsis

The wake of a freely flying European Starling (Sturnus Vulgaris) is investigated as a case study of unsteady wing aerodynamics. Measurements of the wake have been taken using high speed particle image velocimetry and related to the bird's position in the wind tunnel. Regions of strong, negative, spanwise vorticity originating from the downstroke to upstroke transition have been found and characterized. Relatively strong vortices, defined based on vortex swirling strength, have been found at various streamwise locations. Smaller, weaker vortices from the downstroke have been found as well. To investigate wake dynamics, properties of the vorticity and vortices are considered over a range of streamwise positions spanning 4.4 to 6.3 average wing chords behind the wing root.