DOUBLE-FLOW TURBOJET ENGINE AND METHOD OF ITS OPERATION Russian patent published in 2025 - IPC F02K3/75 

FIELD: engines.

SUBSTANCE: invention relates to aircraft turbojet engines, including engines for supersonic multimode aircraft. Double-flow turbojet engine comprises air intake, fan, two airflow loops, two turbines, outer loop nozzle with shutters, afterburner and jet nozzle. Engine is equipped with a device to change the bypass ratio. Device is installed on the outer side of the internal loop in the area of the compressor and the combustion chamber and consists of hydraulic cylinders pivotally connected by rods to a cylindrical washer. Washer is pivotally connected by rods with doors pivotally fixed on the end of the housing of the inner loop. From the outside, the device is partially covered with a fairing. External loop nozzle shutters direct the flow of the second external loop either into the external nozzle, or into the afterburner, or into them simultaneously, depending on the engine operating mode.

EFFECT: when working together with doors, shutters provide higher traction and speed characteristics of supersonic flight.

6 cl, 1 dwg