The trailing vortex in the near-field of a rectangular wing has been visualized using smoke and laser light sheet. The smoke photographs have been used to obtain qualitative and some quantitative information on the evolution of the vortex size in this region. Results are presented for the case of steady, as well as decelerating flow past the wing. In addition, some results are presented for the vortext evolution in the presence of an adverse longitudinal pressure gradient downstream of the wing. The experiemnts indicate that the vortext size in all cases depends on the angle of incidence but is not very sensitive to the pressure gradient downstream of the wing. The vortext growth is significantly enhanced by deceleration, only at angles of incidence at which flow detachment occurs on the wing. Vortex 'breakdown' was found to occur frequently in the presence of a sufficiently strong deceleration.
Visualization of the turbulent trailing vortex behind a finite wing in steady and unsteady flows
Sichtbarmachung des turbulenten Kantenwirbels hinter einem endlichen Fluegel in stationaeren und instationaeren Stroemungen
Forum on Turbulent Flows 1989, The 3rd Joint ASCE/ASME Mechanics Conf. ; FED-76 , Jul ; 59-64
1989
6 Seiten, 6 Bilder, 8 Quellen
Conference paper
English
Unsteady Trailing Vortex Evolution Behind a Wing in Ground Effect
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