METHOD FOR OPERATION OF THREE-CIRCUIT TURBOJET ENGINE WITH AFTERBURNER CHAMBER Russian patent published in 2018 - IPC F02K3/75 F02C3/13 

FIELD: engine building.

SUBSTANCE: method of operation of a three-circuit turbojet engine with an afterburner chamber is that the compressed air from the adjustable fan is divided into the flow of the primary circuit and the flow of the secondary circuit. To form the flow of the third circuit, the channel of the third circuit is connected via a switch to the air intake device. In take-off, maximum and transient modes without forcing the engine, its operation is carried out according to a two-circuit scheme, and in the maximum mode of operation with engine boosting, it follows a straight-through scheme. Flow of the third circuit is fed directly from the air intake device through the channel of the third circuit to the afterburner and the main jet nozzle. Inclusion of the maximum mode of operation with forcing the engine on a once-through scheme is carried out with a transitional mode of operation with the engine being forced, wherein the channel of the third circuit is connected via a switchgear to the output of the adjustable fan and the flow of the third circuit is supplied directly from the channel of the third circuit through the afterburner to the main jet nozzle. Opening and closing the switch and switchgear to activate the maximum mode of operation with the engine being forced according to the flow scheme is performed according to the value of the reduced rotation speed of the adjustable fan and the relative value of the braking temperature of the working fluid.

EFFECT: invention allows to increase the reliability of the engine in the main and transient flight modes.

1 cl, 5 dwg