Measurements are presented of the flow produced by the perpendicular encounter between a streamwise vortex and a wing tip. The resulting flow field, which contains two interacting tip vortices, models the turbulence found in the near tip region on the advancing side of helicopter rotor. This region is a significant source blade-wake interaction(BWI)noise at level flight and mild climb conditions. Both single and two-point turbulence measurements are presented. The single-point measurements reveal the form of the turbulence structure generated by the interaction of the tip vortices.
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