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A kind of thermal protection structure and preparation method thereof

A heat protection structure and heat insulation layer technology, applied in chemical instruments and methods, aerospace vehicle heat protection devices, metal layered products, etc., can solve problems such as difficult to meet the needs of heat protection, achieve excellent heat protection performance, Realize the effect of repeated use and recovery of thermal protection performance

Active Publication Date: 2022-07-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the future, hypersonic vehicles in near space will develop in the direction of high speed, wide airspace, long endurance and repeatability. The environment will become more severe, and the problem of thermal barriers faced by aircraft will become more prominent. It is difficult to meet the thermal protection requirements of future hypersonic aircraft by relying solely on traditional thermal protection mechanisms

Method used

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  • A kind of thermal protection structure and preparation method thereof
  • A kind of thermal protection structure and preparation method thereof
  • A kind of thermal protection structure and preparation method thereof

Examples

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preparation example Construction

[0073] like figure 2 As shown, the present invention also provides a preparation method of a thermal protection structure, comprising:

[0074]The temperature-sensitive hydrogel and the porous thermal insulation structure are placed in a container containing a cooling medium, so that the temperature-sensitive hydrogel enters the porous thermal insulation structure; wherein the temperature of the cooling medium is a first preset temperature , at the first preset temperature, the temperature-sensitive hydrogel is in a de-swelling state;

[0075] lowering the temperature of the cooling working medium to a second preset temperature, so that the cooling working medium is adsorbed in the temperature-sensitive hydrogel in the form of a solid phase to obtain a thermal insulation layer; wherein, at the second preset temperature, The thermosensitive hydrogel is in a swollen state;

[0076] The heat insulation layer and the skin are fixed, and a cavity layer is arranged between the he...

Embodiment 1

[0091] The temperature-sensitive hydrogel and the porous alumina ceramic plate of 100mm × 100mm × 8mm were placed in a container containing distilled water, so that the temperature-sensitive hydrogel entered the porous alumina ceramic plate; wherein, the temperature of the distilled water was 36 ℃, the thermosensitive hydrogel is in a deswelling state;

[0092] lowering the temperature of the distilled water to 25°C, so that the distilled water is adsorbed in the temperature-sensitive hydrogel in the form of a solid phase to obtain a thermal insulation layer; wherein, the temperature-sensitive hydrogel is in a swollen state;

[0093] The heat insulation layer, the skin and the bottom plate are fixed by means of screws and nuts to obtain the bottom plate of the thermal protection structure. Among them, the skin is made of 100mm×100mm×5mm high temperature alloy plate, the bottom plate material is made of 100mm×100mm×5mm aluminum alloy plate, and the screw nuts are M4 alumina cer...

Embodiment 2

[0096] The preparation method of embodiment 2 is basically the same as that of embodiment 1, and the difference is:

[0097] The heat flux density is 0.1MW / m 2 , the thickness of the porous alumina ceramic plate is 5mm.

[0098] The measured outer surface temperature of the skin is 420 °C, and the effective time of the active thermal protection mechanism is 30 minutes.

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Abstract

The invention provides a thermal protection structure and a preparation method thereof. The thermal protection structure comprises an insulating layer, a cavity layer and a skin which are arranged in sequence, and the insulating layer is arranged on the outer surface of the inner cabin of the aircraft; the thermal insulating layer comprises Porous thermal insulation structure, temperature-sensitive hydrogel arranged in the porous thermal insulation structure, and cooling medium adsorbed in the thermal-sensitive hydrogel; when the thermal protection structure is not thermally protected, the temperature-sensitive hydrogel In a swollen state, it is used to adsorb the cooling medium in the thermosensitive hydrogel in the form of a solid phase; when the thermal protection structure is thermally protected, the thermosensitive hydrogel absorbs from the skin and the cavity layer to the surface. The heat of internal radiation makes it in a de-swelling state, which is used to transform the existing form of the cooling working medium from solid phase to liquid phase and gas phase in turn, and release the cooling working medium in the gas phase to the cavity layer and then discharge. The thermal protection structure provided by the present invention has excellent thermal protection performance.

Description

technical field [0001] The invention relates to the technical field of thermal protection, in particular to a thermal protection structure and a preparation method thereof. Background technique [0002] Today, the high-speed flight technology of aircraft has greatly improved the ability of human beings to explore space, enter space, control space and use space, which has special military strategic significance and important scientific value. However, regardless of the near space hypersonic vehicle or the spacecraft entering or returning from interstellar exploration, when re-entry or flight at hypersonic speed (> Mach 5) in the atmosphere, due to the harsh aerodynamic heating environment, the vehicle or spacecraft will face "New thermal barrier" is a key technical problem, and developing thermal protection mechanisms to guide the design and preparation of aircraft thermal protection systems is an effective way to solve this problem. [0003] The thermal protection mechan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B3/24B32B3/08B32B15/20B32B7/08B32B9/00B32B9/04B32B33/00B32B37/00B64G1/58
CPCB32B3/266B32B3/08B32B15/20B32B7/08B32B9/005B32B9/041B32B33/00B32B37/00B64G1/58B32B2307/304
Inventor 金华张劭捷张结艳米智彤尤延铖
Owner XIAMEN UNIV
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