Embedded type stealth air inlet channel

An air inlet, buried technology, applied in the field of aircraft stealth, can solve the problems of increased weight and high cost, and achieve the effect of reducing forward radar echo, avoiding structural weight gain and cost increase

Pending Publication Date: 2022-01-07
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a buried stealth shape air intake, and solve the problems of high cost and increased weight caused by the application of stealth materials in the air intake

Method used

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  • Embedded type stealth air inlet channel
  • Embedded type stealth air inlet channel
  • Embedded type stealth air inlet channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1: Parametric modeling of the shape of the intake port

[0043] According to the project requirements and constraints, sweep the minimum section 3 of the intake duct and the lip 1 area, generate the minimum section 3 line of the intake duct and the basic contour line of the lip 1, and set S 1 , S 2 , S 3 , S 4 , L 1 , L 2 , L 3 , α, β, γ and other parameters, where α, γ take 20°, S 1 , S 2 , S 3 , S 4 Both are tangent fillets. The shape of the inlet lip 1 is constrained by the total length l of the lip 1 and the total width h of the lip 1. The l is taken as 450 mm, and the h is taken as 147 mm to obtain the shape of the quasi-hexagonal lip 1; according to the curve of the lip 1 and the minimum section 3 line, generate channel import segment 2 longitudinal line, set cl 1 、CL 2 and other parameters; sweep the outlet section 4 of the inlet duct to generate the longitudinal line and the section line of the outlet section 4 of the channel. The inner surface...

Embodiment 2

[0053] Step 1: Parametric modeling of the shape of the intake port

[0054] According to the project requirements and constraints, sweep the minimum section 3 of the intake duct and the lip 1 area, generate the minimum section 3 line of the intake duct and the basic contour line of the lip 1, and set S 1 , S 2 , S 3 , S 4 , L 1 , L 2 , L 3 , α, β, γ and other parameters, where α takes 75°, γ takes 20°, S 1 , S 2 , S 4 Both are tangent fillets, L 2 , S 3 , β are both taken as 0, the shape of the inlet lip 1 is constrained by the total length l of the lip 1 and the total width h of the lip 1, l is taken as 525mm, and h is taken as 155mm, and the outer shape of the lip 1 is obtained as a triangular shape; according to the curve of the lip 1 and minimum section 3 lines, generate channel inlet section 2 longitudinal lines, set CL 1 、CL 2 and other parameters; sweep the outlet section 4 of the inlet duct to generate the longitudinal line and the section line of the outle...

Embodiment 3

[0065] Step 1: Parametric modeling of the shape of the intake port

[0066] According to the project requirements and constraints, sweep the minimum section 3 of the intake duct and the lip 1 area, generate the minimum section 3 line of the intake duct and the basic contour line of the lip 1, and set S 1 , S 2 , S 3 , S 4 , L 1 , L 2 , L 3 , α, β, γ and other parameters, where L 1 , L 2 , L 3 Take 0, S 1 , S 2 , S 3 , S 4 Both are tangential transitions. The shape of the inlet lip 1 is constrained by the total length l of the lip 1 and the total width h of the lip 1. The l is taken as 550 mm, and the h is taken as 550 mm to obtain the shape of the oval lip 1; according to the lip 1 Curve and minimum section 3 lines, generate channel inlet section 2 longitudinal lines, set CL 1 、CL 2 and other parameters; the outlet section of the inlet is swept, and the longitudinal line and the section line of the outlet section 4 of the channel are generated. The inner surface...

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PUM

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Abstract

The invention belongs to the field of air inlet channels of aircrafts, and particularly relates to an embedded type stealth air inlet channel. The air inlet channel comprises a lip, a channel inlet section and a channel outlet section, the lip is in a polygon-like lip shape, and the channel inlet section is a low-scattering shape cavity. By applying the embedded type invisible air inlet channel, the radar scattering amount sectional area of the air inlet channel can be effectively reduced, meanwhile, a high total pressure recovery coefficient and small flow field distortion are kept, the stealth/flow field integrated design is achieved, the forward radar stealth problem of the air inlet channel is solved from the appearance, and the stealth performance of the aircraft is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of aircraft stealth, and in particular relates to a buried stealth-shaped intake duct based on a stealth / flow field comprehensive optimization design. Background technique [0002] The air inlet is one of the most important forward radar scattering sources of the aircraft, which affects the stealth performance and battlefield survival rate of the aircraft, and stealth measures should be taken to reduce its RCS. [0003] The patent "A Cavity Structure Using Absorbing Materials" (authorization number: ZL201911154550.8) announced a cavity structure scheme based on the electromagnetic scattering characteristics of the cavity to apply wave-absorbing materials in partitions; the patent "A Thermal Insulation Stealth High temperature resistant air inlet and its preparation method" (application number: CN201710889740.9) announced a heat insulation, radar stealth, infrared Stealth multi-layer high-temperature inlet a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D33/02B64F5/00
CPCB64D33/02B64F5/00
Inventor 郝璐郭晓铛刘雪松张亚坤
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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