The invention discloses a three-channel axisymmetric adjustable air
inlet channel of a wide-area combined engine. The three-channel axisymmetric adjustable air
inlet channel mainly comprises a part of movable lip cover molded surface, a part of movable central cone, a fixed splitter plate part and a valve switch to form a
turbojet channel, a fan channel and a
stamping channel; under a low Mach number (Ma0-2), the fan channel is opened, and the
stamping channel is closed; under a high Mach number (Ma>2), the fan channel is closed, and the
stamping channel is opened; and the
turbojet channel is always in an open state in all Mach number ranges. Along with the increase of incoming Mach number, the front half part of the central cone horizontally moves forwards to ensure a high flow coefficient in a wide range,
shock wave sealing is realized when the Mach number is Ma2 or above, and the flow coefficient of the air
inlet channel is kept at 1.0; the lip cover is linked with the central cone, so that the shrinkage ratio of the inner and outer culverts is increased along with the rise of Mach number, and the flow distribution of the two channels is adjusted as required; and within a certain distance, the maximum windward area of the air inlet channel is obviously increased compared with the capture area along the way.