Wingtip device for the tip of a wing, blade of a wind generator or marine generator for reducing or even eliminating marginal swirl
View Patent ↗A wing-tip device for the tip of a wing, or a blade of a wind generator, or a blade of a marine generator that makes it possible to reduce or even cancel what are known as wing-tip vortices. In the case or a wind generator, the result provides a start-up with less wind, control and energy efficiency that are highly productive throughout its use while at the same time significantly reducing the noise caused by the vortex.
1. A device ( 1 ) for being fixed to an interface ( 3 ) of a wingtip or blade of a wind or marine generator, the device serving to reduce or eliminate marginal swirl, said device comprising:
a streamlined body with a side adapted for securing to a tip of a wing or blade ( 2 ) at an interface ( 3 ) thereof;
a generally cylindrical hollow part merging with the streamlined body on another side thereof and defining a cylindrical channel having an ovoid inlet ( 9 ) with an upstream beveled portion;
the streamlined body having a leading edge protruding into the upstream beveled portion of the ovoid inlet, the leading edge being shaped to induce a COANDA effect at the ovoid inlet, the leading edge terminating at a point ( 7 ) substantially coinciding with a downstream end of the beveled portion of the ovoid inlet ( 9 ); and
at least one helicoidal slot ( 8 ) in said cylindrical hollow part allowing ejection of fluid toward an exterior of said cylindrical hollow part.
2. The device in accordance with claim 1 , further comprising an internal indentation towards an interior ( 10 ) of said device ( 1 ), the internal indentation being adapted for attaching said device on the tip of the wing or the blade at the interface ( 3 ).
3. The device in accordance with claim 1 , wherein said streamlined body further comprises a trailing edge ( 5 ) that is outside and adjacent to said hollow part and that is curved to induce a COANDA effect.