Device For Reducing Or Even Eliminating Tonal Noise For An Aircraft Powerplant De-Icing System

An aircraft powerplant de-icing system, located in a lip surrounding an air intake of a powerplant, said lip extending between an outer wall of a nacelle of the powerplant and an inner duct channeling the air towards a fan arranged downstream of the air intake of the powerplant, said de-icing system comprising:

• a peripheral channel made up of a cavity formed in said lip, arranged around the inner duct of the powerplant and configured for ensuring the circulation around the air intake of a flow of hot gas that is injected into the peripheral channel;
• at least one orifice formed on a side wall of said peripheral channel and through which said flow of pressurized hot gas is exhausted from towards air flowing along the outer wall or the inner duct of the powerplant;
• a deflector positioned next to a downstream edge of the at least one orifice relative to the direction of flow of the air;
• said deflector extending towards inside of the channel, and oriented perpendicularly to the general direction of flow of the air and forming an angle relative to said side wall of the channel along which the air flows, to divert towards outside of said at least one orifice vortices formed in the shear layer of the air over each of the at least one orifice.