Wide velocity domain variable geometry air inlet

Abstract

The invention discloses a wide velocity domain variable geometry air inlet. The start mach number of a hypersonic velocity air inlet is greatly lowered through a rotary hypersonic velocity air inlet lip and a third-stage top plate. A good traffic capture capacity can be guaranteed when the mach number of the hypersonic velocity air inlet is small, and in other words, motor power is guaranteed.

Description

technical field [0001] The invention relates to a wide-speed-range variable-geometry intake port, which belongs to the field of engine intake port flow control. Background technique [0002] In order to realize the flight of a hypersonic vehicle in a wide range, it is difficult to achieve only a single power plant, and a combined power output device must be used. The existing common engine combinations are: rocket-based combined cycle engine (RBCC) and turbine-based combined cycle engine (TBCC) ). With the development of the research, the researchers found that the various performances of the air inlet have increasingly become the bottleneck restricting the development of hypersonic flight technology. It can perform better when it is running under the design state. Once the flight state deviates from the design state, it is difficult for the air intake to provide the engine with proper airflow. As the flight Mach number range widens, it will be difficult for the fixed geom...

AI Technical Summary

Problems solved by technology

Since the aircraft is generally in the acceleration stage at low speed, the inlet is required to have a good ability to capture the incoming flow, that is, it needs to have a high flow coefficient, and when the flow coefficient is high, the startability of the inlet is usually poor, and In order to ensure reliable startup, it is necessary to further sacrifice the amount of flow capture, thus limiting the acceleration effect of the aircraft and affecting the overall performance of the aircraft

[0005] Therefore, the variable geometry inlets used in hypersonic vehicles still require a lower start-up speed, and the problem of excessively sacrificing the flow capture capacity for low-speed start-up

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