Experimental study of a wing tip vortex with tip blowing

An experimental study of the near wake behind a wing with spanwise tip blowing has been performed. The first objective was to gain a better understanding of the effects of tip blowing on the vortex and accompanying turbulence in the near wake. The second objective was the study of wing tip clearance in the presence of tip blowing.; A semispan wing with and without tip blowing was tested in a rectangular wind tunnel at a Reynolds number of 9.2x104 based on the chord length. The wing had an aspect ratio of 5 and the tip blowing was exhausted from 50, 1mm diameter holes in the wing tip. Near wake surveys of the velocity field behind the wing were conducted using hot wire anemometry techniques.; Tip blowing causes significant dispersion and outward movement of the vortex as well as excess momentum and increased kinetic energy within its core. Large increases in the lift coefficient were seen with tip blowing. Significant decreases were seen in the overall drag of the wing with tip blowing. A combination of a high blowing rate and a small tip clearance resulted in a reduced net circulation of the wake.