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.
|State||Published - 1 Jan 2011|
|Event||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 - Ottawa, Canada|
Duration: 28 Jul 2011 → 31 Jul 2011
|Conference||7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011|
|Period||28/07/11 → 31/07/11|