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Backpack type air intake duct with grille inlet

A kind of air intake and piggyback technology, which is applied in the direction of combustion of the air intake of the power plant, can solve the problems affecting the survivability of the aircraft, the unfavorable stealth of the aircraft, etc., and achieve the effects of small distortion, meeting the matching requirements, and good aerodynamic performance

Pending Publication Date: 2018-11-23
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a large-size cavity structure, the Radar Cross Section (RCS) formed by it contributes a lot to the overall RCS of the aircraft, which is detrimental to the stealth of the aircraft and greatly affects the survivability of the aircraft

Method used

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  • Backpack type air intake duct with grille inlet
  • Backpack type air intake duct with grille inlet
  • Backpack type air intake duct with grille inlet

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] The application is a piggyback grille inlet air duct, which includes a transition section 2, an inner pipeline design section 3 and an equal straight section 5 from the front end to the rear end. The front end of the transition section 2 is equipped with a grille 1; the inner pipeline design section 3 The front end is connected to the front end of the inner pipeline design section 3, and the rear end of the inner pipeline design section 3 is connected to the equal straight section 5.

[0027] Grille 1 is installed at the inlet of the air inlet. In order to further reduce the RCS, the symmetrical front edge of the grille is tilted back by 45°, as shown in figure 2 . The design principle of the grille is, based on the plane formed by the symmetrical front edge of the grille and the front edge of the inlet lip, the design diameter of the grille is about 25mm, and the ...

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Abstract

The invention discloses a backpack type air intake duct with a grille inlet. The backpack type air intake duct comprises a transition section, an internal pipeline design section and a cylindrical section from front end to rear end in sequence, and a grille is installed at the front end of the transition section; the front end of the internal pipeline design section is connected with the front endof a bending section, and the rear end of the internal pipeline design section is connected with the cylindrical section. The grille is installed at the inlet of the air intake duct, the front edge of the symmetry plane of the grille is tilted backwards 45 degrees, and the radar cross section RCS is further reduced. On the basis of the plane formed by the front edge of the symmetry plane of the grille and the front edge of a lip of the air intake duct, the aperture of the grille is designed to be about 25 mm, and the grille thickness is designed to be 1 mm. In order to meet the requirements for the air intake flow of an engine, the area of the inlet of the air intake duct is designed to be 1.03 times of the area of the outlet of the air intake duct. The transition section is reserved between the internal pipeline design section and the grille inlet of the air intake duct, so that smooth transition of the inlet and an internal pipeline is ensured.

Description

technical field [0001] The present application relates to the technical field of aircraft, in particular to the technical field of air intakes of aircraft. Background technique [0002] The air intake is a major component of the aircraft propulsion system. The intake port should not only provide matching air flow to the engine, but also ensure the quality of the air flow, that is, meet the matching requirements of the engine intake port flow field. As a large-scale cavity structure, the Radar Cross Section (RCS) formed by it contributes a lot to the overall RCS of the aircraft, which is detrimental to the stealth of the aircraft and greatly affects the survivability of the aircraft. Installing a grille at the inlet of the air inlet reduces the cavity effect to a certain extent, thereby reducing the RCS of the aircraft, which is conducive to stealth. Contents of the invention [0003] The present application provides an air intake duct with better aerodynamic performance,...

Claims

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Application Information

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IPC IPC(8): B64D33/02
CPCB64D33/02
Inventor 葛昌杰陈斌张斌曹世坤周伟胡沛尚银辉
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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