JET ENGINE RESETTABLE INSERT NOZZLE Russian patent published in 2024 - IPC F02K7/18 F02K9/97 F02K1/78 

FIELD: rocketry.

SUBSTANCE: invention relates to nozzles of rocket-ramjet engines. Dumped insert nozzle of rocket-ramjet engine consists of insert and sustainer nozzles, mechanism of fixation and release. Insert nozzle is fixed by balls from alloy with hardness of more than 63 HRC, located in radial holes of circular projection of cruise nozzle, in the housing of which there are gas channels and pyrocartridges coaxial with them, and shifted until engagement with the radial groove in the insert nozzle housing, and fixed by the spacer ring and keys, number and size of which is determined by formula: F_p≥k*F_av, where: F_p is force created by pressure of powder gases of pyro cartridges and determined by formula F_p= p*S_r; p is pressure created by pyrocartridges powder gases; S_r—spacer ring front face area; k—coefficient characterizing non-uniformity of pressure distribution in free volume 11 and margin of shear force; F_av—force required to cut keys and determined by formula F_av=n*S_av*σ_t; n is number of keys; S_av is one key shear area; σ_t—limit of temporary resistance of key material.

EFFECT: providing high reliability of dropping of the insert nozzle of the rocket-ramjet engine and providing the possibility of using a cruise nozzle with a relatively small area of its critical section.

1 cl, 3 dwg