A case study of unsteady wings: The wake of a freely flying European starling (Sturnus vulgaris)

Adam J. Kirchhefer; Daniel Floryan; Wayne Bezner-Kerr; Chris G. Guglielmo; Gregory A. Kopp; Roi Gurka

A case study of unsteady wings: The wake of a freely flying European starling (Sturnus vulgaris)

Adam J. Kirchhefer, Daniel Floryan, Wayne Bezner-Kerr, Chris G. Guglielmo, Gregory A. Kopp, Roi Gurka

Department of Chemical Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

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.

Original language	English
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

Conference	7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011
Country/Territory	Canada
City	Ottawa
Period	28/07/11 → 31/07/11

ASJC Scopus subject areas

Fluid Flow and Transfer Processes

Cite this

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title = "A case study of unsteady wings: The wake of a freely flying European starling (Sturnus vulgaris)",

abstract = "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{\textquoteright}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.",

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AU - Floryan, Daniel

AU - Bezner-Kerr, Wayne

AU - Guglielmo, Chris G.

AU - Kopp, Gregory A.

AU - Gurka, Roi

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AB - 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.

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M3 - Paper

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A case study of unsteady wings: The wake of a freely flying European starling (Sturnus vulgaris)

Abstract

Conference

ASJC Scopus subject areas

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