Aerodynamic Surface Tip Vortex Attenuation System.
Patent, Filed 16 Nov 90, patented 27 Oct 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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Apparatus and method for attenuating fluid foil tip vortices, featuring a Coanda tip and a Coanda curtain. The fluid foil tip has a Coanda surface and means for discharging compressed fluid adjacent thereto a resultant fluid barrier is formed generally chordwise and perpendicular to the fluid foil plane and tangential to the fluid foil tip upon Coanda entrainment and deflection of the discharged compressed fluid. The fluid barrier prevents crossflow from the higher pressure fluid region to the lower pressure fluid region, the fluid regions being separated by the fluid foil when moving relatively through a fluid, the fluid barrier thereby stemming tip vortex generation at its source.