CN112649170A - Compound heat-proof structure in electric arc wind tunnel test cabin - Google Patents
Compound heat-proof structure in electric arc wind tunnel test cabin Download PDFInfo
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- CN112649170A CN112649170A CN202011406375.XA CN202011406375A CN112649170A CN 112649170 A CN112649170 A CN 112649170A CN 202011406375 A CN202011406375 A CN 202011406375A CN 112649170 A CN112649170 A CN 112649170A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- General Physics & Mathematics (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
Abstract
The invention provides a composite heat-proof structure in an arc wind tunnel test cabin, which comprises a carbon fiber plate, a cooling water pipe, an anti-oxidation coating and a plurality of buckles, wherein the cooling water pipe is arranged on one side surface of the carbon fiber plate, the anti-oxidation coating is coated on the other side surface of the carbon fiber plate, and the plurality of buckles are used for fixing the cooling water pipe on the carbon fiber plate. Adopt the red copper tube structure of cooling water of this application structure, it is outstanding to have bending property, the advantage that the heat conductivity is high, the rivers of higher pressure can be born to the suitable condition of wall thickness, water flow is great, the heat of taking away is also big, directly expose and also can not destroyed at high-temperature high-speed air current, adopt snakelike distribution with reasonable density distribution at whole carbon fiber board, can effectually take away the heat of carbon fiber board, prevent that local high temperature from leading to carbon fiber board to be burnt out of work by high temperature air current, can resist great scale heat through the structure that adopts this application, and local emergence is destroyed to the little advantage of whole influence.
Description
Technical Field
The invention relates to the technical field of aerodynamic tests, in particular to a composite heat-proof structure in an arc wind tunnel test cabin.
Background
When the high-speed aircraft outer heat-proof material is subjected to a thermal protection ground simulation test, the thermal protection ground simulation test is usually carried out in an electric arc wind tunnel, high-pressure air is heated by electric arcs and then is heated to a high temperature of thousands of degrees or even tens of thousands of degrees, and the high-pressure air is sprayed out from an outlet at a high speed of thousands of meters per second to enter a test cabin to heat the high-speed aircraft outer heat-proof material so as to simulate a thermal environment encountered when the high-speed aircraft outer heat-proof material flies at a.
Although the high-temperature and high-speed airflow flowing through the heat-proof material outside the high-speed aircraft is finally cooled and exhausted, obviously, the high-temperature airflow cannot be exhausted from the cabin in time, and therefore, the high-temperature airflow can destroy various components in the cabin without protective measures.
It is therefore necessary to protect the various components inside the test chamber: for the parts directly exposed to high-temperature and high-speed airflow, the best scheme is to adopt water pipes to carry water for cooling, for the parts far away from the high-temperature high-speed airflow, the thickness and the mass of the parts are increased, the protection is realized by a method that the heat sink of the parts is large and the amplitude of the whole temperature rise after small-scale heat is absorbed is acceptable, both of these approaches have drawbacks for components that approach high temperature, high velocity gas flow, and, while effective, water-cooled, however, when the area to be protected is large and the number of parts is large, the requirement for cooling water is large and it is difficult to sufficiently ensure, and the pipeline is complicated, once a branch water leakage occurs, the whole system loses the protection capability, the resistance to large-scale heat needs the mass and thickness of the parts to be very large, the actual condition is not allowed, it is therefore desirable to design a heat shield structure that is relatively simple in construction, able to withstand large-scale heat and that is not susceptible to damage locally in its entirety.
Disclosure of Invention
The invention aims to provide a composite heat-proof structure in an arc wind tunnel test cabin, which has a relatively simple structure, can resist large-scale heat and has little influence on the whole due to local damage.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to a first aspect of the embodiment of the invention, the composite heat-proof structure in the arc wind tunnel test chamber comprises a carbon fiber plate, a cooling water pipe, an anti-oxidation coating and a plurality of buckles, wherein the cooling water pipe is arranged on one side surface of the carbon fiber plate, the anti-oxidation coating is coated on the other side surface of the carbon fiber plate, and the plurality of buckles are used for fixing the cooling water pipe on the carbon fiber plate.
Furthermore, the composite heat-proof structure in the arc wind tunnel test chamber also comprises colloid used for fixing the cooling water pipe on the carbon fiber plate.
Further, the colloid is prepared from red copper powder with the granularity of 100 meshes and GD414 silicon rubber according to the proportion of 1: 5, and mixing uniformly.
Furthermore, the cooling water pipe is a cooling water copper pipe.
Furthermore, the cooling water copper tubes are distributed on one side surface of the carbon fiber plate in an S shape.
Furthermore, the distance between the adjacent parallel parts in the cooling water copper tube is D, and
wherein, D is unit mm; qmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2(ii) a G is cooling water flow, and the unit L/h; s is the area of the carbon fiber plate in mm2(ii) a R is the effective radius of the red copper cooling water pipe, and the unit is m.
Further, the material of the buckle is selected from a high-heat-conductivity high-temperature-resistant carbon fiber material.
Further, the carbon fiber sheet has a thickness δ, and
δ＝η×(Qave×0.92+Qmax×0.08)/100，
wherein eta is a safety factor; qaveEstimating the average cold wall heat flow for the working environment in kW/m2；QmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2。
Furthermore, the mounting distance between two adjacent buckles is d, and d is more than or equal to 100mm and more than or equal to 50 mm.
Furthermore, the oxidation-resistant coating is prepared by spraying alumina powder on the surface of the carbon fiber plate at a high temperature, and the thickness of the oxidation-resistant coating is not more than 2 mm.
The embodiment of the invention provides a composite heat-proof structure in an arc wind tunnel test cabin, which has the following advantages compared with the prior art:
(1) the cooling water copper tube with the structure has the advantages of excellent bending performance and high heat conductivity, can bear higher-pressure water flow under the condition of proper wall thickness, has larger water flow and large taken heat, and can not be damaged when being directly exposed to high-temperature and high-speed airflow;
(2) the carbon fiber plate has very good thermal conductivity, and can quickly transmit the temperature of local overheating to other areas, so that the temperature of the whole flat plate is uniform, the local overheating is not easy to burn out, and the carbon fiber plate can customize the appearance according to the appearance of a part to be protected;
(3) the copper tubes distributed on the back of the carbon fiber plate in a snake shape are fixed through the carbon fiber buckles and the high-heat-conductivity high-temperature-resistant glue, so that heat can be effectively taken away;
(4) the carbon fiber plate can accept the air current impact of very high temperature, but under the oxidation environment condition, the carbon fiber plate also is easily by oxidation damage under the not too high condition of temperature, and this application can give full play to the performance of carbon fiber plate through the anti-oxidation coating of the positive high temperature spraying millimeter magnitude thickness at carbon fiber plate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a front view of a composite heat-proof structure in an arc wind tunnel test chamber according to embodiment 1 of the present invention;
fig. 2 is a right side view of a composite heat protection structure in an arc wind tunnel test chamber according to embodiment 1 of the present invention;
FIG. 3 is an enlarged view of area A in FIG. 2;
description of reference numerals: 1-carbon fiber plate; 2-a cooling water pipe; 3-an anti-oxidation coating; 4-buckling; 5-colloid.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a composite heat protection structure in an arc wind tunnel test chamber, including a carbon fiber plate 1, a cooling water pipe 2, an anti-oxidation coating 3 and a plurality of buckles 4, where the cooling water pipe 2 is disposed on one side surface of the carbon fiber plate 1, the anti-oxidation coating 3 is coated on the other side surface of the carbon fiber plate 1, and the plurality of buckles 4 are used to fix the cooling water pipe 2 on the carbon fiber plate 1.
Preferably, the composite heat-proof structure in the arc wind tunnel test chamber further comprises a colloid 5 for fixing the cooling water pipe 2 on the carbon fiber plate 1, and the colloid 5 is filled in a gap between the cooling water pipe 2 and the carbon fiber plate 1; the colloid 5 is prepared from 100-mesh red copper powder and GD414 silicon rubber according to the weight ratio of 1: 5, make after the mass ratio misce bene, make colloid 5 have high temperature resistant, high thermal conductivity's effect, have can use for a long time under 200 ℃ of temperature, can stand 500 ℃ of high temperature for a short time and do not lose efficacy, owing to contain metal powder, its coefficient of thermal conductivity is not less than 6W/mk, this colloid 5 can be effectively with the heat conduction of carbon fiber plate 1 to condenser tube 2, then take away by the cooling water.
Preferably, the cooling water pipe 2 is a cooling water copper tube, and the cooling water copper tube is distributed on one side surface of the carbon fiber plate 1 in an S shape.
Preferably, the cooling water copper tube has good ductility, the heat conductivity is high, withstand voltage is high, under the local destroyed condition of carbon fiber plate 1, can effectual delay the advantage of the expansion of rupture point, select the high-quality pure copper tube of pipe diameter 15mm and wall thickness 2.5mm under the general condition, if the bending radius of carbon fiber plate 1 of following the type is too little, can change into the copper water-cooling tube of minor diameter, adopt snakelike distribution mode to pave the carbon fiber plate 1 back, the distance between its distribution parallel tube can be according to the biggest cold wall heat flow in the twinkling of an eye of the heat environment that needs to resist, cooling water flow decides, under the requirement of cooling water temperature rise control at 30 ℃, its formula is as follows:
wherein, the distance between adjacent parallel parts in the cooling water copper tube is D, and the unit is mm; qmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2(ii) a G is cooling water flow, and the unit L/h; s is the area of the carbon fiber plate in mm2(ii) a R is the effective radius of the red copper cooling water pipe, and the unit is m. For example, in one embodiment, when the cooling water temperature rise is required to be within 30 ℃, under the condition of the cooling water flow rate of 300L/h, one block area is 1m2The carbon fiber plate is paved with a copper tube (effective radius 5mm) with the diameter of 15mm and the wall thickness of 2.5mm, the distance between the tubes is 59.7mm, the whole is 60mm, and the distance can meet the maximum cold wall heat flow 6400kW/m2The short-term effect is not destroyed.
Preferably, the material of the buckles 4 is selected from high-heat-conductivity high-temperature-resistant carbon fiber materials, the installation distance between two adjacent buckles 4 is d, and d is larger than or equal to 100mm and larger than or equal to 50 mm. .
Preferably, the thickness of the carbon fiber plate 1 depends on the severity of the thermal environment of the arc wind tunnel, the more severe the thermal environment, the thicker the required thickness, the larger the mass, and the higher the cost, and the thickness of the carbon fiber plate 1 under normal conditions can be determined according to the average cold wall heat flow of the thermal environment to be resisted and the instantaneous maximum cold wall heat flow within 10s, and the formula is as follows:
δ＝η×(Qave×0.92+Qmax×0.08)/100，
wherein, delta is the thickness of the carbon fiber plate 1, eta is a safety factor, and the value is 1.5 within 2 years of the service life under the general use strength; qaveEstimating the average cold wall heat flow for the working environment in kW/m2；QmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2。
For example, in medium-scale arc tunnels for protecting the cable joint regions below the model supports from high-temperature air currentsThe average cold wall heat flow of the working environment is 87kW/m2However, in the case of a model damaged by overheating, the high-temperature airflow may act directly on the heat-proof structure, and the maximum cold wall heat flow at this time is estimated to be 6400kW/m2The thickness of the carbon fiber plate 1 is 8.88mm calculated by the formula, and the thickness of the carbon fiber plate 1 which is common in the market of 10mm can be selected. Under the use condition of general strength, the steel can normally run for 2 years under the thickness, and can resist 6400kW/m within 10s for a short time2The heat flow of the high-cold wall is not damaged, and related personnel can make a reaction of stopping the test within 10s, so that the damage to the components in the cabin is avoided.
Preferably, the oxidation-resistant coating 3 is prepared by spraying alumina powder on the surface of the carbon fiber plate 1 at a high temperature, and the thickness of the oxidation-resistant coating 3 is not more than 2 mm.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides an electric arc wind tunnel test indoor compound heat protection structure which characterized in that: including carbon fiber plate, condenser tube, anti-oxidation coating and a plurality of buckle, condenser tube lays on a side of carbon fiber plate, anti-oxidation coating coats on another side of carbon fiber plate, a plurality of buckles be used for fixing condenser tube on carbon fiber plate.
2. The composite heat protection structure in the arc wind tunnel test chamber according to claim 1, wherein: the carbon fiber plate cooling device further comprises colloid used for fixing the cooling water pipe on the carbon fiber plate.
3. The composite heat protection structure in the arc wind tunnel test chamber according to claim 2, wherein: the colloid is prepared from 100-mesh red copper powder and GD414 silicon rubber according to the weight ratio of 1: 5, and mixing uniformly.
4. The arc wind tunnel test cabin composite heat-proof structure according to claim 1 or 2, characterized in that: the cooling water pipe is a cooling water copper pipe.
5. The composite heat protection structure in the arc wind tunnel test chamber according to claim 4, wherein: the cooling water copper tubes are distributed on one side surface of the carbon fiber plate in an S shape.
6. The composite heat protection structure in the arc wind tunnel test chamber according to claim 5, wherein: the distance between the adjacent parallel parts in the cooling water copper tube is D, and
wherein, D is unit mm; qmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2(ii) a G is cooling water flow, and the unit L/h; s is the area of the carbon fiber plate in mm2(ii) a R is the effective radius of the red copper cooling water pipe, and the unit is m.
7. The composite heat protection structure in the arc wind tunnel test chamber according to claim 1, wherein: the material of the buckle is selected from high-heat-conductivity high-temperature-resistant carbon fiber materials.
8. The composite heat protection structure in the arc wind tunnel test chamber according to claim 1, wherein: the thickness of the carbon fiber plate is delta, and
δ＝η×(Qave×0.92+Qmax×0.08)/100，
wherein eta is a safety factor; qaveEstimating the average cold wall heat flow for the working environment in kW/m2；QmaxThe maximum cold wall heat flow is estimated for the working environment in kW/m2。
9. The composite heat protection structure in the arc wind tunnel test chamber according to claim 1, wherein: the mounting distance between two adjacent buckles is d, and d is more than or equal to 100mm and more than or equal to 50 mm.
10. The composite heat protection structure in the arc wind tunnel test chamber according to claim 1, wherein: the oxidation-resistant coating is prepared by spraying alumina powder on the surface of the carbon fiber plate at a high temperature, and the thickness of the oxidation-resistant coating is not more than 2 mm.
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Cited By (3)
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| CN113858505A (en) * | 2021-09-23 | 2021-12-31 | 深圳市金石三维打印科技有限公司 | 3D prints finished product water circulative cooling device |
| CN114018535A (en) * | 2021-12-02 | 2022-02-08 | 中国航天空气动力技术研究院 | Combined large-flow mixing pressure stabilizing chamber |
| CN114184346A (en) * | 2021-12-01 | 2022-03-15 | 中国航天空气动力技术研究院 | Fan-shaped side water-cooling large-flow combined air inlet sheet |
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| CN114018535A (en) * | 2021-12-02 | 2022-02-08 | 中国航天空气动力技术研究院 | Combined large-flow mixing pressure stabilizing chamber |
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