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Self-adaptive control method for shock wave sealing of hypersonic speed air inlet channel

An adaptive control and hypersonic technology, applied in high-efficiency propulsion technology, climate sustainability, jet propulsion devices, etc., can solve problems such as weight increase, reliability reduction, actuator structure and control system complexity, and achieve simple structure , the effect of easy installation

Active Publication Date: 2021-03-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these methods have also paid a high price: serious weight increase, complex actuator structure and control system, reduced reliability, etc.

Method used

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  • Self-adaptive control method for shock wave sealing of hypersonic speed air inlet channel
  • Self-adaptive control method for shock wave sealing of hypersonic speed air inlet channel
  • Self-adaptive control method for shock wave sealing of hypersonic speed air inlet channel

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Experimental program
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Embodiment

[0021] according to figure 1 Design flow chart of adaptive control method for hypersonic inlet shock seal. Obtained by wind tunnel tests figure 2 The elastic coefficient required by the medium elastic device, when the flight Mach number and altitude of the aircraft are low, the resistance and the angle of the compression wave system are relatively large at this time, and the compression surface 2.1 of the inlet port will move to the right in the figure, thereby causing the compression wave system to open to the inlet lip cover 2.2; when the flight Mach number and altitude are high, the resistance and the angle of the compression wave system become smaller, and under the action of the elastic device 2.4, the inlet compression surface 2.1 will move to the left in the figure and make the compression The wave system hits the intake lip cover 2.2. image 3 is the inlet flow field without adaptive control, in Figure 4 In the process, the adaptive control is used to realize the ...

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Abstract

The invention provides a self-adaptive control method for shock wave sealing of a hypersonic air inlet channel. The characteristic that the resistance of an air inlet channel is gradually reduced in the process of accelerating a hypersonic aircraft from low Mach to high Mach is combined, self-adaptive movement of the compression surface of the air inlet channel is achieved along with the flight Mach number by utilizing an elastic telescopic mechanism, and therefore the sealing effect of an air inlet shock wave system under the wide-speed-margin flight working condition is achieved. According to the self-adaptive control method for shock wave sealing of the hypersonic speed air inlet channel, the structure is simple, and installation is convenient; and compared with an active control method, input of external energy is not needed, the structure is simple, construction and maintenance are convenient, the proper elastic coefficient is selected, and the shock wave sealing effect under thewide-speed-margin flight working condition can be achieved.

Description

technical field [0001] The invention relates to the technical field of hypersonic air inlets, in particular to an adaptive control method for shock wave sealing. Background technique [0002] Air-breathing hypersonic vehicles need to capture air by themselves to organize the combustion of fuel. The hypersonic inlet is an important part of the air-breathing hypersonic propulsion system, and its performance directly affects the performance of the propulsion system. The flow coefficient of the inlet has the most direct impact on the thrust of the hypersonic propulsion system, and the reduction of the flow coefficient corresponds to the same proportional reduction in the thrust of the propulsion system. Therefore, maintaining the maximum airflow capture of the inlet within the flight envelope of the aircraft is the most important The key to maximum engine performance. [0003] The hypersonic inlet is usually designed at the operating point of the cruising state. In this state,...

Claims

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Application Information

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IPC IPC(8): F02C7/057F02C7/042G01M9/00
CPCF02C7/057F02C7/042G01M9/00Y02T90/00
Inventor 李楠
Owner NORTHWESTERN POLYTECHNICAL UNIV