Three-channel axisymmetric adjustable air inlet channel of wide-area combined engine

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of advanced air intake and exhaust systems for aerospace vehicles, and in particular relates to a three-channel axisymmetric adjustable air intake of a wide-area combined engine. Background technique [0002] The intake port is an important component of the air-breathing engine, and its flow capture coefficient is one of its key performance parameters. The performance of the traditional fixed-geometry inlet meets the expected requirements at the design point, but in the non-design point state, the shock wave at the head of the inlet will change greatly, resulting in a significant decline in the capture flow capacity, so its performance in a wide Mach number Cannot always provide enough required flow to the engine when operating in range. In a wide-range combined engine, the turbojet channel is always in working condition under the action of the precooler, and the fan channel and the ram channel need to be e...

AI Technical Summary

Problems solved by technology

The performance of the traditional fixed-geometry inlet meets the expected requirements at the design point, but in the non-design point state, the shock wave at the head of the inlet will change greatly, resulting in a significant decline in the capture flow capacity, so its performance in a wide Mach number Does not always provide enough required flow to the engine when operating in range

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