CN118067352B - Efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation - Google Patents
Efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 63
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 31
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 239000011148 porous material Substances 0.000 claims description 49
- 238000009423 ventilation Methods 0.000 claims description 48
- 238000005192 partition Methods 0.000 claims description 35
- 230000008602 contraction Effects 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
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Abstract
The invention discloses a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation, which relates to the field of low-temperature transonic wind tunnel design, wherein the low-temperature wind tunnel comprises a stabilizing section, a contracting section, a spraying section, a test section and a diffusion section which are sequentially connected, and the structure comprises: the invention can improve the heat exchange efficiency of low-temperature wind tunnel variable-temperature operation.
Description
Technical Field
The invention relates to the field of low-temperature transonic wind tunnel design, in particular to a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation.
Background
The wind tunnel Reynolds number simulation test capability can be greatly improved by reducing the air flow temperature of an operation medium, the great change of the test air flow temperature is often involved in the low-temperature wind tunnel operation, the temperature change range of the air flow according to test requirements can exceed 200 ℃, the temperature difference between the temperature of a tunnel body structure and the temperature of the air flow is required to be strictly controlled in the air flow temperature change process, the stress strain of the wind tunnel structure is ensured to be within an allowable range, and the wind tunnel operation safety is ensured. At present, a low-temperature wind tunnel generally adopts strictly controlled temperature variable rate to prolong variable temperature duration so as to ensure temperature balance of a tunnel body structure to reduce thermal stress, thus leading to low test efficiency.
When the low-temperature wind tunnel runs, the initial temperature of the airflow and the tunnel body structure is normal temperature, about 20 ℃, the temperature of the airflow needs to be reduced to the lowest temperature of about 160 ℃ below zero by spraying liquid nitrogen, the temperature of the metal structures such as a shrinkage section, a spray pipe section and a test section in a residence chamber needs to be reduced along with the airflow, and the temperature difference between the inner surface and the outer surface of the wall surface is not more than (2-5). The existing resident chamber is a relatively closed cavity without airflow, the temperature change of the metal structure is mainly caused by heat radiation and heat conduction of airflow, and the temperature change of the metal structure is very slow due to large heat capacity of the metal, and the problems of inconsistent thermal deformation of the structure, exceeding of thermal stress and the like can occur. The prior art utilizes the cavity structure to naturally dissipate heat, the heat dissipation efficiency is low, the temperature change rate needs to be strictly controlled during the test, the cooling time needs to be tens of hours, the test efficiency is low, and meanwhile, the thermal stress exceeding standard caused by uneven structural temperature distribution is difficult to avoid.
Therefore, development of a method for improving heat exchange efficiency of a cavity structure and airflow during variable-temperature operation of a low-temperature wind tunnel is urgently needed.
Disclosure of Invention
The invention aims to improve the heat exchange efficiency of low-temperature wind tunnel variable-temperature operation.
In order to achieve the above purpose, the invention provides a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation, wherein the low-temperature wind tunnel comprises a stabilizing section, a contracting section, a spraying section, a test section and a diffusion section which are connected in sequence, and the structure comprises: the outer room that resides, the part section body of stable section, the whole section body of shrink section, the whole section body of spray tube section, the whole section body of test section with the part section body of diffusion section all is located in the outer room that resides, outer room both ends are sealed, outer room that resides with stable section intercommunication, outer room with test section intercommunication, stable section, shrink section, spray tube section, test section and diffusion section form first air flow channel, stable section, outer room that resides and test section form second air flow channel.
The principle of the invention is as follows: the invention aims to realize efficient heat exchange between air flow and a structure in the low-temperature wind tunnel variable-temperature operation process so as to improve the low-temperature wind tunnel operation efficiency. The conventional interlayer cavity structure has low heat exchange efficiency, so that the wind tunnel cooling/heating test time is too long, and the test efficiency and cost are affected. In order to solve the technical problems, the invention provides a structure for improving the heat exchange efficiency of a tunnel body structure and an air flow during the variable-temperature operation of a low-temperature wind tunnel, and forced convection heat exchange is formed by utilizing the static pressure difference of a wind tunnel stabilizing section and a test section. According to the invention, an external resident chamber is added outside the low-temperature wind tunnel, the external resident chamber is utilized to form a convection heat exchange airflow channel, a first airflow channel formed by a stabilizing section, a contraction section, a spray section, a test section and a diffusion section is used as a main airflow channel for test, a second airflow channel is formed by the stabilizing section, the external resident chamber and the test section for heat exchange, namely, a part of airflow of the wind tunnel is led into the second airflow channel, heat on the outer walls of all sections of the corresponding low-temperature wind tunnel in the second airflow channel is exchanged, and then the exchanged airflow is converged into the main airflow and then circularly operated.
Preferably, the structure further comprises a partition screen, wherein the partition screen is positioned in the outer residence chamber and corresponds to the position of the contraction section, and the partition screen is used for dividing the outer residence chamber into a first residence chamber area and a second residence chamber area.
Preferably, the partition screen is provided with a plurality of partition valves.
The first resident chamber area is communicated with the stabilizing section, and the pressure of the first resident chamber area and the stabilizing section is the same, and the first resident chamber area and the stabilizing section are areas with higher pressure. The second resident chamber area is communicated with the test section, has the same pressure with the wall surface of the test section and is a low pressure area. The block valve embedded in the block screen realizes the communication and the cut-off of the two areas. When the block valve is opened, high-pressure gas in the stabilizing section passes through the first columnar ventilation wall to reach the first resident chamber area, and then passes through the block valve group to reach the second resident chamber area with lower pressure.
Preferably, the block valve includes: the device comprises a columnar air inlet pore plate, a columnar air outlet pore plate, a valve seat, a valve core, a driving motor, a partition valve mounting base and a bottom air outlet pore plate;
The columnar air inlet pore plate and the columnar air outlet pore plate are respectively provided with a plurality of air holes, the columnar air inlet pore plate and the columnar air outlet pore plate are respectively positioned at two sides of the partition screen, the columnar air inlet pore plate is in butt joint communication with the columnar air outlet pore plate, a valve seat is arranged between the columnar air inlet pore plate and the columnar air outlet pore plate, a valve core is arranged in the columnar air inlet pore plate and is in sliding connection with the inner wall of the columnar air inlet pore plate, a driving motor is used for driving the valve core to slide in the columnar air inlet pore plate and be closed or separated from the valve seat, a partition valve installation base is arranged on the outer wall of the butt joint end of the columnar air inlet pore plate, a partition screen installation base is arranged on the outer wall of the butt joint end of the columnar air outlet pore plate, the partition valve installation base is connected with the partition screen installation base through screws, the other end of the columnar air outlet pore plate is connected with the bottom air outlet pore plate, and a plurality of bottom air outlet holes are arranged on the bottom air outlet pore plate. The block valve structure realizes that the gas in the first resident chamber area uniformly enters the block valve and uniformly discharges into the second resident chamber area, and has compact structure, reliable sealing and convenient heat preservation of the driving motor.
Preferably, each block valve outlet is provided with a cage type ventilation pore plate which is convenient for air flow to flow uniformly in space and reduces the dead zone of air flow in the second residence chamber area, and a plurality of ventilation holes are arranged on the cage type ventilation pore plate.
Preferably, the stabilizing section is provided with a first columnar ventilation wall, a plurality of ventilation holes are formed in the first columnar ventilation wall, and the stabilizing section is communicated with the outer residence chamber through the first columnar ventilation wall. The first columnar ventilation wall is convenient for maintaining the shape and strength of the stable section on one hand, and the ventilation holes on the first columnar ventilation wall are convenient for communicating with the outer residence chamber on the other hand, so that air flow is introduced into the residence chamber to form heat exchange air flow.
Preferably, the test section is provided with a second ventilation wall, a plurality of ventilation holes or ventilation grooves are formed in the second ventilation wall, and the test section is communicated with the outer residence chamber through the second ventilation wall. The second ventilation wall is convenient for maintaining the shape and strength of the test section on one hand, and the ventilation holes or ventilation grooves on the second ventilation wall are convenient for communicating with the outer residence chamber on the other hand, so that the air flow after heat exchange is led out of the outer residence chamber and is converged with the main air flow in the test section and then circulates in the wind tunnel.
Preferably, the wall thickness of the outer residence chamber is larger than the wall thickness of each section of the low-temperature wind tunnel positioned in the outer residence chamber, the outer residence chamber is of a pressure-bearing structure, and the wall thickness is determined according to the maximum pressure of gas in the outer residence chamber.
Preferably, the vertical section of the partition screen is an annular section, and the partition screen is in sealing connection with the inner wall of the outer residence chamber and the outer wall of the contraction section. The seal prevents leakage from affecting the test.
Preferably, when the low-temperature wind tunnel does not operate and operates at variable temperature, the isolation valve is in an open state to exchange heat, and when the low-temperature wind tunnel is used for carrying out test data test, the isolation valve is in a closed state to avoid influencing the test.
The one or more technical schemes provided by the invention have at least the following technical effects or advantages:
The invention can improve the heat exchange efficiency of the low-temperature wind tunnel variable-temperature operation.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic structural diagram of a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation;
FIG. 2 is a schematic diagram of a block valve;
Wherein, 1-an outer residence chamber; 2-a partition screen; 3-isolating valves; 4-a first residence zone; 5-a second residence zone; 6-cage vent panels; 7-a first cylindrical ventilation wall; 8-a stabilizing section; 9-shrink section; 10-spraying pipe sections; 11-test section; 12-a diffusion section; 13-a valve core; 14-valve seat; 15-a columnar air inlet orifice; 16-a columnar air outlet orifice plate; 17-a bottom outlet orifice plate; 18-a bottom air outlet; 19-mounting a base; 20-a partition screen mounting base; 21-drive motor.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than within the scope of the description, and therefore the scope of the invention is not limited to the specific embodiments disclosed below.
Embodiment one;
Referring to fig. 1-2, arrows in fig. 1 and 2 indicate air flow directions, a left part in fig. 1 is a structure of the efficient heat exchange structure, and a right part is a section of the efficient heat exchange structure in A-A direction; the left part in the diagram of FIG. 2 is the structure of the block valve, and the right part is the cross section of the block valve; fig. 1 is a schematic structural diagram of a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation, and the invention provides a high-efficiency heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation, wherein the low-temperature wind tunnel comprises a stabilizing section, a contracting section, a spraying section, a testing section and a diffusing section which are sequentially connected, and the technical scheme of the invention is specifically described as follows:
annular outer residence chambers 1 are added from the stabilizing section 8 to the diffusion section 12 of the wind tunnel, and are used for forming convection heat exchange airflow channels.
The partition screen 2 is arranged at the inlet position of the contraction section 9, and the area and load of the partition screen can be reduced by designing the inlet of the contraction section, so that the outer residence chamber 1 is divided into two independent first residence chamber areas 4 and second residence chamber areas 5. A plurality of block valves 3 which can be opened and closed independently are arranged on the block screen 2. The outlet of each block valve 3 is integrally provided with a cage type ventilation pore plate 6. The outlet of the stabilizing section 8 is provided with a first cylindrical ventilation wall 7.
The first resident chamber area 4 is communicated with the stable section, and the pressure of the first resident chamber area and the stable section is the same, and the first resident chamber area and the stable section are areas with higher pressure. The second resident chamber area 5 is communicated with the test section, has the same wall pressure as the test section and is a low pressure area. The block valve 3 embedded in the block screen 2 realizes the communication and the disconnection of the two areas. When the block valve 3 is opened, the high-pressure gas in the stabilizing section passes through the first columnar ventilation wall 7, reaches the first resident chamber area 4, passes through the block valve 3, and reaches the second resident chamber area 5 with lower pressure. The cage type ventilation orifice plate 6 is used for air flow equalization in space. The outlet of the stabilizing section 8 is provided with a first columnar ventilation wall 7 which is a passage for air flow to flow out of the stabilizing section, and the first columnar ventilation wall is arranged at the outlet of the stabilizing section so as to facilitate stable air flow to be introduced into the outer residence chamber.
The walls of the contraction section 9, the spray pipe section 10 and the test section 11 are made of low-temperature-resistant stainless steel with the thickness of 2-10 mm. The outer residence chamber 1 is subjected to pressure bearing, and the inner sections such as the contraction section 9, the spray pipe section 10, the test section 11 and the like are molded. The quick heat exchange can be realized by using low-temperature resistant stainless steel with the thickness of 2-10 mm. The pressure bearing of the outer residence chamber 1 means: the wind tunnel operation airflow pressure is mainly born by the outer resident chamber structure. And (3) forming an inner section: the internal section is subjected to a relatively small pressure differential and the primary function is to create the aerodynamic profile required for airflow operation.
Each of the plurality of isolation valves 3 can be independently opened and closed, and the valve type is a sleeve valve. The sleeve valve type structure is compact, and the space arrangement and the heat preservation design are easy.
The first columnar ventilation wall 7 of the stabilizing section can be small holes or ventilation slots which are uniformly distributed, so that the interference of the small holes or ventilation slots on the airflow of the stabilizing section during the normal test of the wind tunnel is reduced.
When the wind tunnel is in variable temperature operation, the block valve 3 is opened, part of air flow of the stabilizing section 8 passes through the first columnar ventilation wall 7 to enter the first residence chamber region 4, then passes through the block valve 3 to enter the cage ventilation pore plate 6, and is diffused to the second residence chamber region 5, and finally returns to the main air flow through the second ventilation wall of the test section 11.
After the wind tunnel temperature changing operation is completed, the block valve 3 is closed, so that the operation control of the Mach number of the wind tunnel test can be ensured not to be influenced.
The flow of the gas entering the outer residence chamber 1 can be regulated by changing the opening and closing quantity of the isolating valve 3, or by changing the air flow speed of the test section so as to change the pressure difference, or by combining two regulating schemes.
According to the technical scheme, when the low-temperature wind tunnel performs variable-temperature operation, forced convection is formed by utilizing the pressure difference between the stabilizing section and the test section, so that the heat exchange capacity of the indoor tunnel body structure can be greatly enhanced, and the heat exchange efficiency is improved. The air flow is driven by the compressor in the wind tunnel, and after the air flow of the stabilizing section is accelerated by the contraction section and the spray pipe, the air flow reaching the test section has higher speed and lower static pressure, so that the pressure difference is generated between the stabilizing section and the test section.
According to the efficient heat exchange structure in the wind tunnel temperature change process, through designing the interlayer resident chamber, the partition screen and the partition valve group, the static pressure difference between the stable section and the test section in the wind tunnel operation is utilized to introduce the main wind tunnel airflow into the interlayer, so that the heat exchange efficiency of the tunnel wall in the temperature change process can be greatly improved, the thermal stress caused by uneven structure temperature is reduced, meanwhile, the temperature change time is shortened, and the wind tunnel operation efficiency can be improved. Taking 323K cooling to 110K as an example, the invention can shorten the cooling time from 10 hours to about 3 hours.
The following are examples of specific structural parameters of the present invention:
The outer resident chamber is designed to be stopped at the diffusion section from the stabilization section, the diameter D3 corresponding to the spray pipe section, the test section and the diffusion section of the outer resident chamber is 3-5 times of the equivalent diameter D1 of the test section, and the diameter D4 corresponding to the stabilization section of the outer resident chamber is 1.1-1.3 times of the equivalent diameter D2 of the stabilization section. D1 affects the response time of the wind tunnel flow field, and D4 mainly considers the structural installation size, so that the requirements of the response time and the installation size of the wind tunnel flow field can be met through the design parameters.
The length L of the first columnar ventilation wall 7 corresponding to the stable section takes 10% of the equivalent diameter D2 of the stable section, the ventilation rate is about 8% -12%, the aperture of the small hole is 0.2% of the equivalent diameter D2 of the stable section, and the aperture range is 3-30 mm. The above pore size range can meet the requirement that a small Kong Kongjian size cannot affect the main flow.
The vertical section of the partition screen is an annular section and is connected with the inner wall of the outer residence chamber and the outer surface of the contraction section, and the partition screen is a sealing structure. The plurality of the isolation valves are uniformly arranged in the annular section of the isolation screen, and each isolation valve is identical. The seal can prevent that gas leakage from influencing the test, and the block valve evenly arranges and can guarantee that air current space flows evenly, and the block valve is the same mainly for simple structure, also is favorable to the air current even.
The block valve adopts a sleeve valve type as shown in fig. 2, the sleeve valve type has compact structure and is easy to spatially arrange and preserve heat, and fig. 2 is a schematic structural diagram of the block valve, and the valve core axially moves. The valve core and the valve seat are of a sealing structure in the closing state of the isolating valve, and the first resident chamber area and the second resident chamber area are in an isolation state. When the block valve is opened, the gas in the first resident chamber area passes through the columnar air inlet pore plate from the circumferential direction and enters the valve body, and then flows out of the downstream columnar air outlet pore plate and enters the second resident chamber area.
Each valve in the isolating valve can independently operate, and is directly driven by a low-temperature motor, the valve core moves linearly, and when the valve core reaches the valve seat position, the valve is closed.
When the wind tunnel does not operate and the variable temperature operates, the block valve is in an open state. When the wind tunnel is tested by the test data, the isolating valve is in a closed state.
The wind tunnel typical cooling operation flow is as follows:
opening all the isolating valves;
The speed of the power system is increased, and the Mach number of the test section reaches about 0.2-0.30;
the stable section and the test section form a pressure difference, about 10% of low-temperature air flow in the stable section passes through the first columnar ventilation wall to enter the first residence chamber area for blending, then passes through the partition valve column-shaped air inlet pore plate from the circumferential direction to enter the valve body, flows out of the cage-shaped air inlet pore plate at the downstream of the valve to enter the second residence chamber area, and returns to the main air flow from the test section after being blended with the air in the residence chamber.
The temperature of the wall body corresponding to the low-temperature-resistant stainless steel of 2-10 mm in the residence chamber (the contraction section, the spray pipe section and the test section) is subjected to forced convection heat exchange in the inner and outer air flow, and the temperature of the wall body corresponding to the low-temperature-resistant stainless steel of 2-10 mm is synchronously and rapidly reduced in the continuous cooling process of the main air flow.
And after the temperature of the main air flow is reduced to the set temperature, continuously maintaining operation, and when the temperature difference between the outside temperature of the wall body corresponding to the low-temperature-resistant stainless steel with the 2-10 mm test section and the air flow temperature is less than 2K, closing the isolating valve to perform test data test operation.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. The utility model provides a high-efficient heat transfer structure suitable for low temperature wind tunnel alternating temperature operation, its characterized in that, low temperature wind tunnel includes stable section, shrink section, spouting pipe section, test section and the diffusion section that connects gradually, the structure includes: the outer residence chamber, the partial section body of the stabilizing section, the whole section body of the contraction section, the whole section body of the spray pipe section, the whole section body of the test section and the partial section body of the diffusion section are all positioned in the outer residence chamber, the two ends of the outer residence chamber are sealed, the outer residence chamber is communicated with the stabilizing section, the outer residence chamber is communicated with the test section, the stabilizing section, the contraction section, the spray pipe section, the test section and the diffusion section form a first airflow channel, and the stabilizing section, the outer residence chamber and the test section form a second airflow channel;
The structure also comprises a partition screen, wherein the partition screen is positioned in the outer residence chamber and corresponds to the position of the contraction section, and the partition screen is used for dividing the outer residence chamber into a first residence chamber area and a second residence chamber area; the partition screen is provided with a plurality of partition valves; when the low-temperature wind tunnel does not operate and the variable-temperature operation is performed, the isolation valve is in an open state, and when the low-temperature wind tunnel is subjected to test data testing, the isolation valve is in a closed state.
2. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein the block valve comprises:
The device comprises a columnar air inlet pore plate, a columnar air outlet pore plate, a valve seat, a valve core, a driving motor, a partition valve mounting base and a bottom air outlet pore plate;
The columnar air inlet pore plate and the columnar air outlet pore plate are respectively provided with a plurality of air holes, the columnar air inlet pore plate and the columnar air outlet pore plate are respectively positioned at two sides of the partition screen, the columnar air inlet pore plate is in butt joint communication with the columnar air outlet pore plate, a valve seat is arranged between the columnar air inlet pore plate and the columnar air outlet pore plate, a valve core is arranged in the columnar air inlet pore plate and is in sliding connection with the inner wall of the columnar air inlet pore plate, a driving motor is used for driving the valve core to slide in the columnar air inlet pore plate and be closed or separated from the valve seat, a partition valve installation base is arranged on the outer wall of the butt joint end of the columnar air inlet pore plate, a partition screen installation base is arranged on the outer wall of the butt joint end of the columnar air outlet pore plate, the partition valve installation base is connected with the partition screen installation base through screws, the other end of the columnar air outlet pore plate is connected with the bottom air outlet pore plate, and a plurality of bottom air outlet holes are arranged on the bottom air outlet pore plate.
3. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein each block valve outlet is provided with a cage type ventilation pore plate, and the cage type ventilation pore plate is provided with a plurality of ventilation holes.
4. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein the stabilizing section is provided with a first columnar ventilation wall, a plurality of ventilation holes are formed in the first columnar ventilation wall, and the stabilizing section is communicated with the external residence chamber through the first columnar ventilation wall.
5. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein the test section is provided with a second ventilation wall, a plurality of ventilation holes or ventilation grooves are formed in the second ventilation wall, and the test section is communicated with the external residence chamber through the second ventilation wall.
6. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein the outer residence chamber is of a pressure-bearing structure, and the wall thickness is determined according to the maximum pressure of gas in the outer residence chamber.
7. The efficient heat exchange structure suitable for low-temperature wind tunnel variable-temperature operation according to claim 1, wherein the vertical section of the partition screen is an annular section, and the partition screen is in sealing connection with the inner wall of the outer residence chamber and the outer wall of the contraction section.
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| 0.3m低温连续式跨声速风洞结构设计;赖欢;实验流体力学;20201031;全文 * |
| 空间热循环系统带载降温工况参数化分析;廖达雄;航空动力学报;20231031;全文 * |
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