OPERATING METHOD OF AXISYMMETRIC ROTARY NOZZLE OF TURBOJET ENGINE Russian patent published in 2019 - IPC F02K1/80 

FIELD: engines and pumps.

SUBSTANCE: invention relates to aircraft turbojet engines, namely to operation of axisymmetric rotary nozzle, which provides engine variation of thrust along direction. Method of operating axisymmetric rotary nozzle turbojet engine, in which axis of rotation of movable housing is directed across longitudinal axis of fixed nozzle housing, and on front flange of movable housing there is an annular sealing element, includes mounting of rotary nozzle on turbojet engine for its operation. After the nozzle is assembled on the engine during its operation, the gap between the spherical surface of the fixed housing and the end face of the segment insert is measured periodically in the zone of the nozzle maximum distance from the axis of rotation. Gap size is used to define degree of wear of graphite inserts working surfaces, and if gap value is within range of minimum values permitted for sealing element performance, nozzle is dismantled from engine for repair. After the engine nozzle dismantling, the sealing element housing bolts are fixed to the front flange of the rotary case from the threaded holes of the front flange. Rotating the sealing element housing around its longitudinal axis by a quarter turn to align the holes axes in the sealing element housing with the threaded holes axes in the movable housing front flange. Attachment bolts are screwed into the threaded holes of the front flange until the sealing element housing end is pressed against the front end of the front flange of the movable housing, after which the nozzle is mounted on the engine.

EFFECT: longer service life of annular sealing element of rotary jet nozzle.

1 cl, 3 dwg