CN106197938A - Free jet dynamometer check model novel heat-insulation system - Google Patents
Free jet dynamometer check model novel heat-insulation system Download PDFInfo
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- CN106197938A CN106197938A CN201610487590.4A CN201610487590A CN106197938A CN 106197938 A CN106197938 A CN 106197938A CN 201610487590 A CN201610487590 A CN 201610487590A CN 106197938 A CN106197938 A CN 106197938A
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- balance
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- force balance
- jet
- protective cover
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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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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a kind of free jet dynamometer check model novel heat-insulation system, comprising: force balance, it is arranged on mould impression, and one end of force balance is connected to mould impression；Pole, its one end is connected to the other end of described force balance；Balance protective cover, it is located on described force balance, described force balance is thermally shielded protection；Insulating assembly, it includes along the collet that described pole is circumferentially disposed, defines sealing space between collet and described pole outer peripheral face；The upper interval of described pole arranges labyrinth seal assemblies, and sealing space is divided at least three compartment；And air cooling assembly, it includes the jet ring being positioned at compartment and being set on pole periphery；The cold duct of connection jet ring；Cold duct connects high pressure cold source, and jet ring spray goes out to cool down gas and reduces mould impression temperature.The present invention uses multiple heat insulation and cooling means, and cooling-down effect is notable and compact conformation, it is possible to the effective temperature controlling balance.
Description
Technical field
The present invention relates to wind tunnel test equipment, more particularly it relates to an free jet dynamometer check model is new
Type insulation system.
Background technology
Along with development and the needs of national strategy of China's Aerospace Technology, hypersonic vehicle is increasingly becoming country
The emphasis of aerospace field development.Different from conventional low-speed operations device, there is time scale, Reynolds during hypersonic flight
The effects such as number, temperature and heat chemistry, need the high temperature of the air velocity of simulated Mach number more than 5, about 2000K during wind tunnel test
Yardstick with the characteristic time meeting temperature effects.What free jet tunnel can provide high speed in reversed direction adds thermal current to simulate height
The typical flight environment of vehicle of supersonic speed, solves the comprehensive mechanical environment of flight course to Aerodynamic Characteristics, the knot of each parts
Structure globality, the impact vibrated and impact.Owing to model and dynamometric system are in high temperature gas flow for a long time, mould will certainly be caused
The temperature of type and balance constantly promotes, and too high temperature can cause balance foil gauge to produce the biggest temperature drift, causes dynamometry
Data serious distortion even can damage balance foil gauge and cause test failure.Owing to carrying out dynamometer check in free jet
It is not the longest that the time is carried out in work, does not the most still have standardized heat insulation and heat control system available.
Summary of the invention
It is an object of the invention to solve at least the above, and the advantage that at least will be described later is provided.
It is a still further object of the present invention to provide a kind of free jet dynamometer check model novel heat-insulation system, use multiple
Heat insulation and cooling means, cooling-down effect is notable and compact conformation, it is possible to the effective temperature controlling balance.
In order to realize according to object of the present invention and further advantage, it is provided that a kind of free jet dynamometer check model
Novel heat-insulation system, comprising:
Force balance, it is arranged on mould impression, and one end of described force balance is connected to mould impression；
Pole, its one end is connected to the other end of described force balance；
Balance protective cover, it is located on described force balance, described force balance is thermally shielded protection；
Insulating assembly, it includes along the collet that described pole is circumferentially disposed, described collet and described pole outer peripheral face
Between define sealing space；The upper interval of described pole arranges labyrinth seal assemblies, and described sealing space is divided at least three
Compartment；
And air cooling assembly, it includes the jet ring being positioned at described compartment and being set on pole periphery；Connection is described
The cold duct of jet ring；Described cold duct connects high pressure cold source, and described jet ring spray goes out to cool down gas and reduces in model
Cavity temperature.
Preferably, the cross section of described pole is square, and described pole axially inside direction is formed with passage；Described cold
Feed channel is arranged in described passage along described pole axial direction.
Preferably, described jet ring is arranged to tetragon around described pole outer peripheral face, and described jet ring is flat
Hollow ventilating pipeline；Multiple fumarole is offered on the sidewall of described jet ring.
Preferably, described balance protective cover includes: upper balance protective cover, it is the framework that Open Side Down, is located at institute
State the top of force balance；
Lower balance protective cover, it is the framework of opening upwards, is located at the lower section of described force balance；
And liner plate, it is arranged on the both sides of described force balance, fixes described upper balance protective cover and institute by screw
State lower balance protective cover；The opening of described upper balance protective cover and lower balance protective cover is oppositely arranged thus defines that one is internal
Space, described force balance is accommodated in described inner space；Described balance protective cover is by the screw being arranged on force balance
It is fixedly attached on described force balance.
Preferably, described labyrinth seal assemblies includes outer labyrinth seal and interior labyrinth seal；Described interior labyrinth is close
It is circumferentially extending along described mould impression inwall that sealing is arranged on outer labyrinth seal described in described outer labyrinth seal, described outer fan
Palace sealing member includes outer labyrinth upper slice and the outer labyrinth bottom sheet connected by bearing pin；
Described interior labyrinth seal extends along described pole periphery wall, and described interior labyrinth seal includes being connected by bearing pin
Interior labyrinth upper slice and interior labyrinth bottom sheet.
Preferably, described jet ring is fixed on described pole by clip, and described fumarole sets with equidistant intervals
Put on the described whole circumference of jet ring；Described jet ring inlet end is connected to cold duct by a copper tube.
Preferably, described jet ring is three, and is connected to described cold duct, and described cold duct extends through
Go out described pole.
Preferably, described collet is mutually fastened formed by upper thermal insulation board and lower thermal insulation board；Before described upper thermal insulation board
End is connected to described mould impression by a connection piece；Described lower thermal insulation board is fixed in tested device by attachment screw.
Preferably, described free jet dynamometer check model novel heat-insulation system also includes, is connected to described dynamometry sky
The tapered sleeve of flat one end, described tapered sleeve is fixing connects tested device.
Preferably, the other end of described force balance is connected to described strut ends by Tapered Cup and passes through wedge
Tension.
The present invention at least includes following beneficial effect: free jet dynamometer check model novel heat-insulation system of the present invention
Use multiple provision for thermal insulation, utilize balance protective cover that described force balance carries out ground floor heat insulation, then utilize and be arranged on
It is heat insulation that collet on bar carries out the second layer to force balance, utilizes jet ring to carry out gas cooling simultaneously, and its heat insulation and heat control is imitated
Fruit is notable.Described collet, outer labyrinth seal and interior labyrinth seal all can use carbon fiber or glass-reinforced plastic material
Make etc. lightweight material, so the lightweight construction of whole system.Therefore, free jet dynamometer check mould of the present invention
Type novel heat-insulation system structure is compact, simple, easy to assembly；And system structure is lightweight.
Part is embodied by the further advantage of the present invention, target and feature by description below, and part also will be by this
Invention research and practice and be understood by the person skilled in the art.
Accompanying drawing explanation
Fig. 1 is the overall assembling cross-sectional schematic of free jet dynamometer check model novel heat-insulation system of the present invention；
Fig. 2 is the plan structure schematic diagram of free jet dynamometer check model novel heat-insulation system of the present invention；
Fig. 3 is the structural representation of the jet ring of free jet dynamometer check model novel heat-insulation system of the present invention；
Fig. 4 is the assembling schematic diagram of the jet ring of free jet dynamometer check model novel heat-insulation system of the present invention；
Fig. 5 is the balance protective cover assembling signal of free jet dynamometer check model novel heat-insulation system of the present invention
Figure；
Fig. 6 is that the structure of the outer labyrinth seal of free jet dynamometer check model novel heat-insulation system of the present invention is shown
It is intended to；
Fig. 7 is that the structure of the outer labyrinth seal of free jet dynamometer check model novel heat-insulation system of the present invention is shown
It is intended to.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
Should be appreciated that used herein such as " have ", " comprising " and " including " term are not precluded from one or many
Other element individual or the existence of a combination thereof or interpolation.
As shown in Figure 1, 2, free jet dynamometer check model novel heat-insulation system of the present invention includes:
Force balance 4, it is arranged on mould impression (not shown), and one end of described force balance 4 is connected to model
Inner chamber；The front end of the most described force balance 4 is connected to mould impression；
Pole 12, its one end is connected to the other end such as tail end of described force balance 4；
Balance protective cover 30, it is located on described force balance 4, described force balance 4 is thermally shielded protection；
Insulating assembly, it includes along the collet 40 that described pole is circumferentially disposed, described collet 40 and described pole 12
Sealing space is defined between outer peripheral face；On described pole 12, interval arranges labyrinth seal assemblies, is divided in described sealing space
At least three compartment 41,42,43；
And air cooling assembly, it includes the jet ring 7 being positioned at described compartment and being set on pole periphery；Connection is described
The cold duct 26 of jet ring；Described cold duct connects high pressure cold source 14, and described jet ring 7 ejection cooling gas reduces mould
Cavity temperature in type.
As in figure 2 it is shown, after first balance protective cover 30 and force balance 4 being assembled when installing, by such as coordinating cone and wedge
Block is connected with described pole, is connected with model by such as tapered sleeve.Described balance protective cover 30 carries out to described force balance 4
One layer of thermal insulation protection.Collet 40 front end is fixed on mould impression by connector；Collet 40 utilizes connector 20 and spiral shell
Nail 21 is connected with tested device such as bomb body；Collet 40 is set in pole 12 periphery one circumferentially closed entirety of composition；Right
Described force balance 4 carries out second layer thermal insulation protection.Labyrinth seal assemblies is such as by connector 22 and attachment screw 23,24
Collet 40 is connected with bomb body.Labyrinth seal assemblies forms complete gas circuit labyrinthine system and pole 12 is divided into multiple airtight
Space；On jet ring 7 is placed in the confined space that labyrinth is divided in and fix, with the copper tube of pole 12 inner chamber with pole 12
Connecting and form multichannel cooling air circuit, high pressure gas splits into multichannel cooling air stripping air supply source by plug.
Wherein in an embodiment, as it is shown in figure 1, the cross section of described pole 12 is square, the internal edge of described pole 12
Axial direction is formed with passage 121；Described cold duct 26 is arranged in described passage 121 along described pole axial direction.Will
Described pole 12 is arranged to hollow bar, is possible not only to alleviate the weight of component, can be placed on by cold duct 26 described simultaneously
In the passage 121 of pole so that it is structure is compacter.
Wherein in an embodiment, as shown in Figure 3 and Figure 4, described jet ring 7 sets around described pole 12 outer peripheral face
Being set to tetragon, described jet ring 7 is flat hollow ventilating pipeline；Multiple fumarole is offered on the sidewall of described jet ring 7
71.Described jet ring 7 for example, overall structure, respectively fumarole 71, vent lumen 72, jet ring clip 73, clip screw
74 are constituted.Jet ring 7 is the flat tetragon breather line of inner hollow, and corner is by being welded to connect, uniform multiple on it
Fumarole 71, in jet ring 7, shape face is consistent with pole 12 external surface, is connected also with pole 12 external surface by jet ring clip 73
Fixed by clip screw 74；Copper tube 8 is connected offer cooling gas and reduces mould impression temperature with jet ring 7.
Wherein in an embodiment, as shown in Figure 1 and Figure 5, described balance protective cover 30 includes: upper balance protective cover 6,
It is the framework that Open Side Down, is located at the top of described force balance 4；
Lower balance protective cover 9, it is the framework of opening upwards, is located at the lower section of described force balance 4；
And liner plate 61, it is arranged on the both sides of described force balance 4, fixes described upper balance protective cover by screw 62
6 and described lower balance protective cover 19；The opening of described upper balance protective cover 6 and lower balance protective cover 19 is oppositely arranged thus limits
Having determined an inner space, described force balance 4 is accommodated in described inner space；Described balance protective cover 30 is by being arranged on dynamometry
Screw 5 on balance 4 is fixedly attached on described force balance 4.Described upper balance protective cover 6 and lower balance protective cover 19 are installed
Force balance 4 is thermally shielded protection to balance, first upper balance protective cover 6 is fixed on lining by 8 upper attachment screws 62
On plate 61, more lower balance protective cover 19 is fixed on liner plate 61 by 8 lower attachment screws 191, finally upper balance is protected
The protective cover of cover 6, lower balance protective cover 19 and liner plate 61 composition combines with force balance 4, and by 4 protective cover screw holes 63
Fix with balance attachment screw 5 with balance protective cover.
Wherein in an embodiment, as shown in Figure 6, described labyrinth seal assemblies includes outer labyrinth seal 9,15 and interior
Labyrinth seal 10,16；It is internal that described interior labyrinth seal 10,16 is arranged on described outer labyrinth seal 9,15, described outer labyrinth
Sealing member 9,15 is circumferentially extending along described mould impression inwall, and described outer labyrinth seal 9,15 includes being connected by bearing pin 25
Outer labyrinth upper slice 9 and outer labyrinth bottom sheet 15；It is overall that described outer labyrinth upper slice 9 and the combination of outer labyrinth bottom sheet 15 form outer labyrinth, its
Two ends, labyrinth upper slice 9 are outer labyrinth side plate 91 and cooperation face 92 at home and abroad, and bottom sheet 15 two ends, outer labyrinth are outer labyrinth side plate 151 and join
Conjunction face 152, outer labyrinth side plate 91 and outer labyrinth side plate 151 and pole 12 keep certain gap, outer labyrinth upper slice 9 and outer labyrinth
Bottom sheet 15 is all by coordinating face and connector to be connected with mould impression；Outer labyrinth seal is positioned at two ends, cooperation face, forms one
Concave, the effect of outer labyrinth seal is that air-flow is formed preliminary barrier layer, cooperatively forms gas with interior labyrinth seal
Stream labyrinthine system, by increasing the turnover passage of gas circuit to realize stopping the effect of air-flow.
As it is shown in fig. 7, described interior labyrinth seal 10,16 extends along described pole 12 periphery wall, described interior labyrinth seal
Part 10,16 includes interior labyrinth upper slice 10 and the interior labyrinth bottom sheet 16 connected by bearing pin.Interior labyrinth is overall by interior labyrinth upper slice 10
Forming with interior labyrinth bottom sheet 16, wherein interior labyrinth upper slice coordinates face 101 and interior labyrinth bottom sheet to coordinate face 161 to use with pole with pole
In time installing with pole 12 with the use of, interior labyrinth upper slice 10 and interior labyrinth bottom sheet 16 are through 2 interior labyrinths upper slice and interior labyrinth
Bottom sheet connects pin 25 and connects between region that is integral and that be installed on outer labyrinth side plate 91 and outer labyrinth side plate 151 composition,
Interior labyrinth seal entirety surrounding keeps certain interval with outer labyrinth seal whole inner cavity；Outer labyrinth seal is overall with interior fan
Palace sealing member entirety composition air-flow labyrinthine system stops the flowing of air-flow to reduce heat exchange.Interior labyrinth seal plays resistance equally
The effect of gear air-flow, cooperatively forms labyrinthine system to stop air-flow with outer labyrinth seal；Cooperation face is used for interior labyrinth seal
With pole contact cooperation；Interior labyrinth seal with coordinate face e.g. one；Cooperation face is such as by controlling machining accuracy
The surface smoothness reaching requirement realizes sealing.
Wherein in an embodiment, as shown in Figure 4, described jet ring 7 is fixed to described by jet ring clip 73
On bar 12, described fumarole 71 is to be equidistantly spaced on the described whole circumference of jet ring 7；Described jet ring 72 inlet end
It is connected to cold duct 26 by a copper tube 8.Described fumarole 71 is such as opened in the downstream of gas flow direction, improves fall
Temperature cooling effectiveness.
Wherein in an embodiment, as shown in Figure 4, described jet ring 7 is three, and is connected to described refrigerator pipe
Road 26, the extension of described cold duct 26 passes described pole 12.Described cold duct for example, three, corresponding to described jet ring
7 are arranged, and are used for providing high pressure to cool down gas.
Wherein in an embodiment, as it is shown in figure 1, described collet 40 is mutual by upper thermal insulation board 3 and lower thermal insulation board 17
Fasten and formed；Described upper thermal insulation board 3 and lower thermal insulation board 17 such as connect by connector and screw are fixing.Described upper thermal insulation board 3
Front end be connected to described mould impression by a connection piece 2；Described lower thermal insulation board 17 is fixed on tested by attachment screw 21
On device such as bomb body.Upper thermal insulation board 3 front end is taken block 2 by thermal insulation board of going forward and is connected with mould impression, and remaining is all by outer fan
Palace upper slice is connected with outer labyrinth upper slice 9 with upper thermal insulation board connector 11, and lower thermal insulation board 17 then utilizes lower thermal insulation board and connector 20
And screw 21 is connected with bomb body, upper and lower thermal insulation board is by coordinating face one circumferentially closed entirety of composition；For described force balance 4
Second layer thermal insulation protection is provided, provides space for air cooling simultaneously.
Wherein in an embodiment, as it is shown in figure 1, described free jet dynamometer check model novel heat-insulation system is also wrapped
Including, be connected to the tapered sleeve 1 of described force balance 4 one end, described tapered sleeve 1 is fixing connects tested device.
First force balance 4 and balance protective cover system 30 are assembled into during assembling an entirety, carry out interior labyrinth afterwards close
Sealing 10,16 and the assembling of jet loop systems, the 3rd step completes the installation of outer labyrinth seal, finally by upper and lower thermal insulation board 3,7
Take with thermal insulation board of going forward block 2, outer labyrinth upper slice 9 be connected with upper thermal insulation board connector 11 and each connector fixing after formed complete
Free jet dynamometer check model novel heat-insulation system.
Although embodiment of the present invention are disclosed as above, but it is not restricted in description and embodiment listed
Using, it can be applied to various applicable the field of the invention completely, for those skilled in the art, and can be easily
Realizing other amendment, therefore under the general concept limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (10)
1. a free jet dynamometer check model novel heat-insulation system, it is characterised in that including:
Force balance, it is arranged on mould impression, and one end of described force balance is connected to mould impression；
Pole, its one end is connected to the other end of described force balance；
Balance protective cover, it is located on described force balance, described force balance is thermally shielded protection；
Insulating assembly, it includes along the collet that described pole is circumferentially disposed, between described collet and described pole outer peripheral face
Define sealing space；The upper interval of described pole arranges labyrinth seal assemblies, and described sealing space is divided at least three compartment；
And air cooling assembly, it includes the jet ring being positioned at described compartment and being set on pole periphery；Connect described jet
The cold duct of ring；Described cold duct connects high pressure cold source, and described jet ring spray goes out to cool down gas and reduces mould impression temperature
Degree.
2. free jet dynamometer check model novel heat-insulation system as claimed in claim 1, it is characterised in that described pole
Cross section is square, and described pole axially inside direction is formed with passage；Described cold duct is along described pole axial direction cloth
Put in described passage.
3. free jet dynamometer check model novel heat-insulation system as claimed in claim 2, it is characterised in that described jet ring
Being arranged to tetragon around described pole outer peripheral face, described jet ring is flat hollow ventilating pipeline；Described jet ring
Multiple fumarole is offered on sidewall.
4. free jet dynamometer check model novel heat-insulation system as claimed in claim 1, it is characterised in that described balance is protected
Guard shield includes: upper balance protective cover, it is the framework that Open Side Down, is located at the top of described force balance；
Lower balance protective cover, it is the framework of opening upwards, is located at the lower section of described force balance；
And liner plate, it is arranged on the both sides of described force balance, by screw fix described upper balance protective cover and described under
Balance protective cover；The opening of described upper balance protective cover and lower balance protective cover is oppositely arranged thus defines that one is internal empty
Between, described force balance is accommodated in described inner space；Described balance protective cover is solid by the screw being arranged on force balance
Surely it is connected on described force balance.
5. free jet dynamometer check model novel heat-insulation system as claimed in claim 1, it is characterised in that described labyrinth is close
Sealing assembly includes outer labyrinth seal and interior labyrinth seal；Described interior labyrinth seal is arranged on described outer labyrinth seal institute
State outer labyrinth seal circumferentially extending along described mould impression inwall, outside described outer labyrinth seal includes being connected by bearing pin
Labyrinth upper slice and outer labyrinth bottom sheet；
Described interior labyrinth seal extends along described pole periphery wall, in described interior labyrinth seal includes being connected by bearing pin
Labyrinth upper slice and interior labyrinth bottom sheet.
6. free jet dynamometer check model novel heat-insulation system as claimed in claim 3, it is characterised in that described jet ring
Being fixed on described pole by clip, described fumarole is to be equidistantly spaced on the described whole circumference of jet ring；Institute
State jet ring inlet end and be connected to cold duct by a copper tube.
7. free jet dynamometer check model novel heat-insulation system as claimed in claim 6, it is characterised in that described jet ring
Being three, and be connected to described cold duct, the extension of described cold duct passes described pole.
8. free jet dynamometer check model novel heat-insulation system as claimed in claim 1, it is characterised in that described collet
Mutually fastened formed by upper thermal insulation board and lower thermal insulation board；The front end of described upper thermal insulation board is connected to described model by a connection piece
Inner chamber；Described lower thermal insulation board is fixed in tested device by attachment screw.
9. free jet dynamometer check model novel heat-insulation system as claimed in claim 1, it is characterised in that also include connecting
At the tapered sleeve of described force balance one end, described tapered sleeve is fixing connects tested device.
10. free jet dynamometer check model novel heat-insulation system as claimed in claim 9, it is characterised in that described dynamometry
The other end of balance is connected to described strut ends by Tapered Cup and is strained by wedge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610487590.4A CN106197938B (en) | 2016-06-28 | 2016-06-28 | Free jet dynamometer check model insulation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610487590.4A CN106197938B (en) | 2016-06-28 | 2016-06-28 | Free jet dynamometer check model insulation system |
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| CN106197938A true CN106197938A (en) | 2016-12-07 |
| CN106197938B CN106197938B (en) | 2018-11-23 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108692909A (en) * | 2018-06-27 | 2018-10-23 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of water-cooling structure being thermally shielded protection to wind-tunnel balance |
| CN109632234A (en) * | 2018-12-25 | 2019-04-16 | 中国航天空气动力技术研究院 | A kind of gas vane carried engine hot commissioning test rudderpost protective device |
| CN110207938A (en) * | 2019-06-14 | 2019-09-06 | 北京空天技术研究所 | Ventilating model force measuring method under free jet tunnel experimental condition |
| CN110426175A (en) * | 2019-06-14 | 2019-11-08 | 北京空天技术研究所 | Ventilating model device for measuring force under free jet tunnel experimental condition |
| CN111175008A (en) * | 2020-02-20 | 2020-05-19 | 中国空气动力研究与发展中心超高速空气动力研究所 | Heat-insulation tail support rod for hypersonic wind tunnel |
| CN113109016A (en) * | 2021-04-21 | 2021-07-13 | 重庆大学 | Device for simulating temperature change of skyhook in supersonic wind tunnel test |
| CN113267312A (en) * | 2021-07-19 | 2021-08-17 | 中国空气动力研究与发展中心超高速空气动力研究所 | Test model for high-temperature wind tunnel |
| CN113280995A (en) * | 2021-07-19 | 2021-08-20 | 中国空气动力研究与发展中心超高速空气动力研究所 | Cooling device for high-temperature wind tunnel model |
| CN113390600A (en) * | 2021-07-26 | 2021-09-14 | 中国空气动力研究与发展中心计算空气动力研究所 | Shock tunnel test simulation device and method for pneumatic thermal effect of pyrolysis gas |
| CN115290290A (en) * | 2022-10-09 | 2022-11-04 | 中国航空工业集团公司沈阳空气动力研究所 | Similar mortise and tenon structure of wind tunnel test model and design method thereof |
| CN116916636A (en) * | 2023-09-14 | 2023-10-20 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel balance temperature control device |
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