Birth of starting vortex and establishment of Kutta condition

This work provides direct experimental evidence supporting the generation of the airfoil circulation associated with a starting vortex as a viscous-flow process based on global velocity measurements near the trailing edge (TE) of a NACA0012 airfoil at the angle of attack of 6° in a low-speed wind tu...

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Bibliographic Details
Published in:European journal of mechanics, B, Fluids B, Fluids, 2025-03, Vol.110, p.19-24
Main Authors: Salazar, David M., Liu, Tianshu
Format: Article
Language:English
Subjects:
Airfoil
Circulation
Kutta condition
Lift
Optical flow velocimetry
Starting vortex
Topology
Viscous flow
Wind tunnel
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Summary:This work provides direct experimental evidence supporting the generation of the airfoil circulation associated with a starting vortex as a viscous-flow process based on global velocity measurements near the trailing edge (TE) of a NACA0012 airfoil at the angle of attack of 6° in a low-speed wind tunnel. The evolving flow topology near the TE exhibits the apparent inviscid flow pattern in a very short initial period, the sequential formation and growth of the starting vortex as a result of near-wall viscous flow development, and the final establishment of the Kutta condition as the starting vortex travels downstream. The evolving flow field in the starting flow over the airfoil is topologically consistent.
ISSN:0997-7546
DOI:10.1016/j.euromechflu.2024.11.007