System for reducing aerodynamic noise at a supplementary wing of an aircraft

A system for reducing aerodynamic noise of a supplementary wing of an aircraft, comprising:

• a portion of the supplementary wing hinged to the main wing, extendable to open a gap region between the main wing and the supplementary wing;
• a separating surface movable into the gap region when the supplementary wing is extended, the separating surface extending at least partially along a separation flow line between a vortex flow region and a gap flow region of air flowing in the gap region between the supplementary wing and the main wing, the separating surface being an n-stable surface that is able to assume a discrete number n of stable states in which the surface is not influenced by actuating forces, actuation being necessary to move the surface from a stable state into another stable state or an unstable state;
• and
• an actuator device for moving the separating surface between at least one stable state position and at least one additional position;
• wherein the separating surface at least partially covers the vortex flow region and is supported on both sides along lines extending in a spanwise direction;
• and
• wherein the separating surface is fixedly clamped on one side, and is supported in an articulated manner along the line extending in the spanwise direction on another side.