SILENCING NOZZLE OF AIR-JET ENGINE (VERSIONS) Russian patent published in 2007 - IPC F02K1/40 

FIELD: aircraft industry.

SUBSTANCE: invention relates to aircraft nozzles with devices for silencing noise of jets of air-jet engine. Three versions of silencing nozzle are proposed. According to first design version, channel of constricting flat nozzle of air-jet engine with cutouts in shell in area of throat section is divided by partitions into row of small nozzles. Edges of upper shells of small nozzle are displaced relative to corresponding edges of lower shell of small nozzles either forward or backward along axis of nozzle channel. Direction of displacement of edges of upper and lower shells of small nozzles alternates. According to second design version, channel of constricting axially symmetrical nozzle of air-jet engine with cutout of shell in area of troat section is divided into sectors by pylons directed from shell to axis of nozzle channel and they do not reach opposite wall of nozzle. Edges of shells between pylons of adjacent sector opposite wall of nozzle. Edges of shells between pylons of adjacent sectors are displaced relative to each other either forward or backward along axis of nozzle channel. Direction of displacement of edges of shells of adjacent sectors alternates. According to third design version, pylons are installed at exit section of axially symmetrical nozzle of air-jet engine containing shell and central body. Said pylons are installed between central body and shell, dividing channel of nozzle into row of small channels, and deflecting flaps are arranged on surface of central body on every other small channel. Front edge of flaps is hinge-connected to central body near throat section of nozzle.

EFFECT: reduced noise of jet owing to creating different direction of velocity vector at nozzle exit.

4 cl, 27 dwg