FLOW OVER A FREE-FLYING DELTA WING
G. D. Miller and C. H. K. Williamson
A great many studies have been
directed towards understanding the flow over wings and, in particular, over a delta wing.
Very surprisingly indeed, in our view, there exist no visualizations, from the laboratory,
of the far-field development of the trailing vortex pair as it travels downstream, to
our knowledge. Our flow visualization, involving novel free-flight gliding of a delta
wing in water, shows for the first time, the exquisitely beautiful structure of the
turbulent wake, in plan view. The fluorescence dye,
illuminated by a laser, shows that the near wake comprises an interaction between the
primary streamwise vortex pair with the "braid" wake vortices between the pair.
See also far wake of a delta wing and
break-down of a vortex pair.
This work is supported by the Office of Naval Research.
Extract from the Gallery of Fluid Motion, Physics of Fluids, Vol. 7, No. 9, September