METHOD OF OPERATION OF THREE-CIRCUIT TURBOJET ENGINE Russian patent published in 2017 - IPC F02K3/77 F02K3/75 

FIELD: engines and pumps.

SUBSTANCE: compressed air from the adaptive fan is divided into three streams. The stream of the first circuit is fed to the gas generator, the exhaust gases from which are fed into the low pressure turbine, and from it through the mixer and the afterburner into the main jet nozzle. The stream of the second circuit is fed through the afterburner into the main jet nozzle. The stream of the third circuit is fed to the nozzle of the third circuit. The operation of the engine is controlled by switching from a three-circuit operation scheme to a two-circuit operation scheme and back, and also by changing the degree of the two-circuit engine by switching the direction of the compressed air streams by means of the distribution devices and engaging the afterburner. In the maximum and transient operation modes with engine forcing, the compressed air stream of the third circuit is fed directly from the third circuit channel through the afterburner into the main jet nozzle. Opening and closing of switchgears for connecting and disconnecting the channel of the third circuit is carried out according to the values of the reduced low pressure rotor speed.

EFFECT: increase of the maximum flight thrust of the turbojet engine in maximum and transient modes with engine forcing while maintaining fuel consumption parameters.

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