EXHAUST NOZZLE OF AN AIRCRAFT TURBOJET ENGINE Russian patent published in 2018 - IPC F02K1/04 F02K1/12 F02K1/82 

FIELD: motors and pumps.

SUBSTANCE: invention relates to jet nozzles of non-boost gas turbine engines for aviation application. Exhaust nozzle of a turbojet engine of the aircraft has a curved channel open from an inlet and outlet sides and having a lower, upper and side walls, includes a portion of the channel converging to a critical section of a rectangular shape towards an exit, provided with a movable flap, and a divergent section therefrom. Inlet side of the channel is connected to an outer contour, guides on an outer surface of the movable flap of the convergent section of the channel are slidable in slots arranged in the side walls of the channel. Movable flap is configured to adjust the area of the nozzle's critical section. Movable leaf of the convergent section of the channel is provided with a control drive and, together with the drive is hingedly connected to the upper wall of the channel. In the divergent section of the channel, the upper and lower movable flaps are provided, equipped with control drives and the contour of the aircraft continuing along the outer surface. Upper movable flap and the control drive thereof in the critical section region are hingedly connected to the movable flap of the convergent section of the channel, and the lower movable flap and the control drive thereof in the critical section region are hingedly connected to the lower wall of the channel. Inner surface of the upper, lower and side walls of the channel is covered with a radio-absorbing coating, and a cooling screen with air supplied from an engine compressor is attached to the outside of the upper, lower and side walls of the duct visible from the rear hemisphere.

EFFECT: invention makes it possible to reduce the thrust loss and reduce the specific fuel consumption during operation of the turbojet engine, improve maneuverability and reduce the level of visibility of the aircraft in the rear hemisphere.

10 cl, 2 dwg