Axially symmetrical variable geometry bimodal air inlet channel adaptive to broad Mach number flight

Abstract

The invention discloses an axially symmetrical variable geometry bimodal air inlet channel adaptive to broad Mach number flight. The bimodal air inlet channel comprises a movable center cone, a flow deflector, a fairing and an actuation regulating system. In the working process of the air inlet channel, the actuation system drives the movable center cone and the fairing to translate front and backindependently along with variation of the Mach number of an incoming flow, the flow deflector is separated from the movable center cone at a low Mach working point, accordingly two air inlet passagesare formed, a throat channel area is widened, and the effect of increasing a flow coefficient in low Mach flight can be achieved; the movable center cone is seamlessly combined with the flow deflector in high Mach flight, a working mode of the air inlet channel turns to a one-channel working mode, at the moment, the throat channel area of the air inlet channel is shrunk, the internal compressionratio is increased, and the air compression requirement when the air inlet channel works at high Mach can be met while the flow requirement in high Mach flight is met.

Description

technical field [0001] The invention relates to the field of aerospace technology, and more specifically relates to an axisymmetrical variable geometry dual-mode air inlet suitable for wide Mach number flight. Background technique [0002] As an important part of the aerodynamic system, the intake port is to ensure the flow required by the engine and complete the compression of the high-speed incoming flow through the generated shock wave system and surface changes. The axisymmetric inlet has the same structural advantages as the binary inlet, such as simple structure and easy manufacture, and the compression of the airflow by the axisymmetric inlet includes a part of the isentropic compression process, so the compression efficiency is high; Since the axisymmetric inlet is structurally easier to match with the engine body, it has been widely used in aerodynamic systems. However, due to the difference in structure, the traditional axisymmetric inlet cannot change the compres...

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides an axisymmetric variable-geometry dual-mode inlet adaptable to flight at a wide Mach number. The inlet of this form adopts a dual-channel working mode for the large flow demand during low Mach flight. Compared with the traditional inlet, the throat area can be greatly increased, thereby increasing the flow coefficient of the inlet when flying at low Mach; for the high performance requirements during high Mach flight, the inlet is converted to a single-channel working mode , so as to ensure the compression efficiency of the inlet port when flying at a high Mach number, and obtain a higher total pressure recovery coefficient

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