Air inlet duct adjusting device and method

A technology of air inlet and sliding device, which is applied in the direction of jet propulsion device, gas turbine device, ramjet engine, etc., can solve the problem that the air inlet cannot be adjusted, achieve stable ending shock wave system, improve anti-backpressure ability, The effect of strong engineering realization

Inactive Publication Date: 2019-08-23
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides an adjustable air inlet solution, which

Method used

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  • Air inlet duct adjusting device and method
  • Air inlet duct adjusting device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: An adjustable device for an air inlet, including an air inlet main body, a slider, a driving mechanism and a locking mechanism. There is a groove on the inner surface of the airway, and the slider is connected to the groove. The power provided by the driving mechanism slides along the groove. When the slide reaches a suitable position, the locking mechanism locks the slider. When the aircraft is flying at a speed greater than Mach 3.5, that is, at a high Mach number, the slider is fixed at the throat, and when the aircraft is flying at a speed of less than Mach 3.5, that is, at a low Mach number, the slider moves to the rear of the throat and is fixed.

[0025] The cross-sectional shape of the slider is as figure 1 It is shown as a quadrilateral, and its height is not greater than the difference between the maximum height at the rear of the inlet throat and the height at the throat, and the length of the slider in the axial direction of the projectile body...

Embodiment 2

[0028] Embodiment 2: An adjustable device for an air inlet, including an air inlet main body, a slider, a driving mechanism and a locking mechanism. There is a groove on the inner surface of the airway, and the slider is connected to the groove. The power provided by the driving mechanism slides along the groove. When the slide reaches a suitable position, the locking mechanism locks the slider. When the aircraft is flying at a speed greater than Mach 3.5, that is, at a high Mach number, the slider is fixed at the throat, and when the aircraft is flying at a speed of less than Mach 3.5, that is, at a low Mach number, the slider moves to the rear of the throat and is fixed.

[0029] The cross-sectional shape of the slider is as figure 1 As shown, its height is equal to the difference between the maximum height of the rear portion of the throat of the air inlet and the height of the throat, and the length is 2.2 times of the height. On its upper surface, there is a device that m...

Embodiment 3

[0031] Embodiment 3. An adjustable air inlet device, in which the locking device is installed on the projectile and is a positioning pin, and two or more can be provided as required. figure 2 is the state of the air inlet when the aircraft is flying at a high Mach number. At this time, the slider is at the throat of the air inlet, and the locking mechanism A locks the slider. image 3 Shown is the state of the air inlet when the aircraft is flying at a low Mach number. At this time, the slider is behind the throat of the air inlet, and the locking mechanism B locks the slider. All the other devices are the same as in Example 1.

[0032] The device can be used in any form of air intake, figure 2 , 3 For this purpose, the device is set in the state of the lower jaw inlet. In the dual inlet, the slider can be located on the side of the outer cover or on the side of the side plate; in the center cone inlet, the slider can be located on the side of the compression cone. .

[...

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Abstract

The invention provides a step-by-step adjustable air inlet duct by means of moving a sliding block to adapt to a working mach number state and an air inlet duct adjusting method. The step-by-step adjustable air inlet duct comprises an air inlet duct main body, a sliding block, a sliding device, a driving mechanism and a locking mechanism, wherein the air inlet main body consists of a part of an outer surface of an elastic body and an air inlet duct outer cover, the inner surface of the air inlet duct is provided with the sliding device, the sliding block is connected with the sliding device and slides along the sliding device by power provided by the driving mechanism, and when the sliding block slides to a proper position, the locking mechanism locks the sliding block, so that the technical problem that an air inlet duct in a complex profile structure cannot be adjusted in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of aircraft shape design, in particular to the design of an air inlet. Background technique [0002] The supersonic inlet is an important part of the sub-combustion ramjet engine. Its main function is to decelerate and supercharge the high-speed incoming flow in the far front, convert the kinetic energy of the airflow into pressure energy, and provide the required air flow for the combustion chamber. The performance of the airway will have an important impact on the specific impulse and thrust performance of the ramjet. For a supersonic vehicle operating in a wide Mach number range (such as Ma2~Ma4), if a fixed-geometry inlet is used, in order to take into account the low Mach number starting capability, the inlet must be in a state of large throat, resulting in the air intake when working at a high Mach number. The critical total pressure recovery coefficient is greatly reduced, which seriously affects the...

Claims

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Application Information

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IPC IPC(8): F02C7/042F02K1/06F02K7/14
CPCF02C7/042F02K1/06F02K7/14
Inventor 郭敬涛周硕蔡飞超金志光
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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