CN109677632B - Protection system for icing-preventing and deicing experiments of icing wind tunnel - Google Patents
Protection system for icing-preventing and deicing experiments of icing wind tunnel Download PDFInfo
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- CN109677632B CN109677632B CN201910057693.0A CN201910057693A CN109677632B CN 109677632 B CN109677632 B CN 109677632B CN 201910057693 A CN201910057693 A CN 201910057693A CN 109677632 B CN109677632 B CN 109677632B
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- protective cover
- icing
- electric heating
- arc
- wind tunnel
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- 238000002474 experimental method Methods 0.000 title claims abstract description 13
- 238000005485 electric heating Methods 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910021389 graphene Inorganic materials 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 abstract description 14
- 230000002265 prevention Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000007788 liquid Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a protection system for icing-preventing and deicing experiments of an icing wind tunnel, which comprises an air duct, a protection cover, an electric heating unit and a pneumatic sliding table positioned outside the air duct; the cross section of protection casing is arc, is equipped with the arc slot with the shape complex of protection casing on the wind channel, and pneumatic slip table connects in the one end of protection casing and drives the protection casing and insert the arc slot or take out from the arc slot. To protect the simulated wings of the aircraft under test during the experiment. The device has the advantages of simple and convenient operation, simple structure, convenient installation, low energy consumption, convenient maintenance, obvious effect and the like, and can effectively improve the icing prevention and deicing experimental quality of the icing wind tunnel.
Description
Technical Field
The invention relates to the field of airplane anti-icing and deicing tests, in particular to a protection system for an icing wind tunnel anti-icing and deicing test.
Background
Aircraft icing is always one of the main threats of aviation safety, and a ground icing wind tunnel is established for researching aircraft anti-icing and deicing. The ground ice prevention and removal experiment has high requirements on the icing environment and mainly comprises the wind speed, the icing temperature, the Liquid Water Content (LWC) and the average particle size (MVD) in an air duct. When the experiment is started, the spray frame sprays water, liquid water is supercooled and then impacts the surface of a test piece, and the freezing temperature, the liquid water content and the average particle size can reach a stable state after the spray frame is opened for a period of time. Liquid water impacting on the surface of the test piece before the test state is stable does not meet the test requirements, the test piece is protected by the protection device, and the protection device is opened after the test conditions are stable to perform an anti-icing and deicing test.
At present, a large domestic icing wind tunnel adopts a built-in protection device to protect a test piece, the size of a protection cover structure is large, the protection cover is only used for the large wind tunnel on trial, and the built-in protection structure can influence a flow field in the wind tunnel, so that the experimental accuracy is reduced.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a protection system for an icing wind tunnel icing prevention and deicing test aiming at the defects of the background technology. The system is simple and convenient to install and operate, obvious in effect and high in precision, and can effectively improve the environmental quality of icing prevention and deicing tests of the icing wind tunnel.
The technical scheme is as follows: in order to achieve the purpose, the protection system for the icing and deicing wind tunnel ice prevention and deicing experiment can adopt the following technical scheme:
a protection system for icing and deicing experiments of an icing wind tunnel comprises an air duct, a protection cover, an electric heating unit and a pneumatic sliding table positioned outside the air duct; the cross section of the protective cover is arc-shaped, an arc-shaped slot matched with the protective cover in shape is formed in the air channel, and the pneumatic sliding table is connected to one end of the protective cover and drives the protective cover to be inserted into or pulled out of the arc-shaped slot; the electric heating unit is installed on the protective cover.
Further, still include air compressor, this air compressor provides power for pneumatic slip table.
Further, the electric heating device also comprises a power supply connected with the electric heating unit.
Further, still include the control unit, set up the slide rail stroke through the control unit, heating temperature.
Furthermore, the graphene electric heating film is pasted on the inner side of the protective cover and serves as an electric heating unit, and a temperature sensor is arranged on the graphene electric heating film.
Furthermore, two sealing strips are arranged on the protective cover and used for sealing in an air inlet and outlet channel state.
Furthermore, the pneumatic sliding table and the protective cover are connected through a connecting piece.
Has the advantages that: compared with the prior art, the lower ejector rod and the ejector column which are always spliced with the template jointly provide the action of the ejector rod, so that the basic function of supporting the template is ensured, the template is not required to be separated from the lower ejector rod when the core box is required to be cleaned, and the lower ejector rod is only required to be separated from the ejector column. The problem of the installation location that lower ejector pin and template separation and grafting caused difficult and damage lower ejector pin is solved. And the compression spring can further protect the lower ejector rod, and the impact force of the lower ejector rod caused by the ejector column can be buffered when the lower ejector rod is abutted against the ejector column, so that the bottom end of the lower ejector rod is prevented from being damaged.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the control unit and the transmission structure are positioned outside the test section, and the flow field in the air duct is not influenced after the protective cover is pulled away;
2. according to the invention, the graphene composite material is used as a heating source, the heating rate is high, the heating is uniform, the protective cover is heated in the protection stage, so that the accumulation of an ice layer on the protective cover can be effectively prevented, and the protective cover is prevented from being blocked when being pulled out of the wind tunnel;
3. the pneumatic sliding table is adopted, the displacement amount is preset in advance, the precision of the moving slide rail is high, the error is less than 0.1 mm/meter stroke, and the moving speed can reach 30 meters/second;
4. the control unit controls the protective cover to enter and exit and the heating switch simultaneously, the heating unit is started simultaneously when the protective cover enters the wind tunnel, the heating unit is closed when the wind tunnel is removed, the surface temperature of the protective cover is monitored through a temperature sensor arranged on the protective cover, and the heating power is automatically adjusted through a preset temperature value, so that the energy consumption can be effectively reduced, and the system controllability is improved;
5. the sealing strips are arranged at the two ends of the protective cover, so that the air tightness of the air duct when the system works is ensured.
The device has the advantages of simple and convenient operation, simple structure, convenient installation, low energy consumption, convenient maintenance, obvious effect and the like, and can effectively improve the icing prevention and deicing experimental quality of the icing wind tunnel.
Drawings
FIG. 1 is a schematic structural diagram of a protection system for icing wind tunnel icing prevention experiments.
Fig. 2 is a perspective view of the pneumatic slide table and the protective cover in the invention.
Fig. 3 is a perspective view of the shield.
FIG. 4 is a schematic view of an air duct with arc-shaped slots.
Detailed Description
Referring to fig. 1, the invention discloses a protection system for an icing wind tunnel icing and deicing experiment, which comprises an air duct 4, a protection cover 3, an electric heating unit and a pneumatic sliding table 1 positioned outside the air duct 4. Wherein, the air duct 4 is in the experimental space of the aircraft wing icing experiment, the simulation wing 5 to be tested is placed in the air duct 4 in advance, and the air in the air duct carries with the super-cooled water drops to impact. Before the expected supercooled water droplet state is formed, a period of time is needed until the supercooled water droplets which do not reach the standard are sprayed out of the air duct until the supercooled water droplet standard is reached, and the supercooled water droplets which do not reach the standard cannot contact the simulation wing 5. At this time, the simulated wing 5 needs to be protected by the protective cover 3. As shown in fig. 1, the cross section of the protective cover 3 is circular arc, and the air duct 4 is provided with an arc slot 41 matching with the shape of the protective cover. In the present embodiment, the arc-shaped insertion groove 41 is formed in the observation window of the air duct 4. The pneumatic sliding table 1 is connected to one end of the protective cover 3 and drives the protective cover to be inserted into the arc-shaped slot or drawn out of the arc-shaped slot. An air compressor 6 is used for providing power for the pneumatic sliding table. The pneumatic sliding table 1 is connected with the protective cover 3 through the connecting piece 2, so that the protective cover 3 can be conveniently detached and replaced. The protective cover 3 is provided with two sealing strips 11 for sealing in the state of an air inlet and outlet channel.
The electric heating unit is installed on the protective cover. In the present embodiment, a graphene electric heating film is attached as an electric heating unit to the inside of the shield, and the temperature sensor 10 is mounted on the graphene electric heating film. And a power supply 8 connected with the electric heating unit is arranged outside the air duct 4.
The system also comprises a control unit 7, and the sliding rail stroke and the heating temperature are set through the control unit 7.
When the system is applied to a specific icing and deicing wind tunnel experiment, the control unit 7 is started to set the heating temperature and the slide rail stroke. Before the icing wind tunnel sprays, the protective cover 3 enters the wind channel 4 and is blocked in front of the simulation wing 5, and meanwhile, the electric heating unit is started. The system continues to work until the icing parameters (liquid water content, average particle size, temperature) are stable, melting the ice layer that impinges on the shield 3. The heating temperature is the surface temperature of the protective cover, and can be adjusted within 0-80 ℃ according to the experimental requirements. After the icing parameters are stable, the protection system is closed, the protection cover 3 is drawn out of the air channel, and the electric heating unit is synchronously closed. The electric heating unit automatically controls the heating power through a temperature controller in the control unit so as to ensure that the heating temperature is a set value. When the system is started, the air compressor is started to simultaneously carry out advanced inflation; after the main switch is closed, the air compressor automatically discharges air, so that the experimental safety is ensured.
In addition, the present invention has many specific implementations and ways, and the above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (6)
1. The utility model provides a protection system that is used for icing wind-tunnel to prevent and remove ice experiment which characterized in that: comprises an air duct, a protective cover, an electric heating unit and a pneumatic sliding table positioned outside the air duct;
the cross section of the protective cover is arc-shaped, an arc-shaped slot matched with the protective cover in shape is formed in the air channel, and the pneumatic sliding table is connected to one end of the protective cover and drives the protective cover to be inserted into or pulled out of the arc-shaped slot; the electric heating unit is arranged on the protective cover;
two sealing strips are arranged on the protective cover and used for sealing in the state of an air inlet channel and an air outlet channel.
2. The shield system of claim 1, wherein: still include air compressor, this air compressor provides power for pneumatic slip table.
3. The shield system according to claim 1 or 2, wherein: and the power supply is connected with the electric heating unit.
4. The shield system of claim 3, wherein: the device also comprises a control unit, and the slide rail stroke and the heating temperature are set through the control unit.
5. The shield system of claim 1, wherein: the graphene electric heating film is pasted on the inner side of the protective cover and serves as an electric heating unit, and a temperature sensor is arranged and installed on the graphene electric heating film.
6. The shield system of claim 1, wherein: the pneumatic sliding table is connected with the protective cover through a connecting piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910057693.0A CN109677632B (en) | 2019-01-22 | 2019-01-22 | Protection system for icing-preventing and deicing experiments of icing wind tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910057693.0A CN109677632B (en) | 2019-01-22 | 2019-01-22 | Protection system for icing-preventing and deicing experiments of icing wind tunnel |
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| Publication Number | Publication Date |
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| CN109677632A CN109677632A (en) | 2019-04-26 |
| CN109677632B true CN109677632B (en) | 2021-11-23 |
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| CN201910057693.0A Active CN109677632B (en) | 2019-01-22 | 2019-01-22 | Protection system for icing-preventing and deicing experiments of icing wind tunnel |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411698A (en) * | 2019-07-11 | 2019-11-05 | 中国空气动力研究与发展中心低速空气动力研究所 | The anti-deicing test method of icing wind tunnel |
| CN112829949B (en) * | 2020-12-25 | 2022-07-26 | 象辑科技股份有限公司 | Aircraft icing risk monitoring method |
| CN116923689A (en) * | 2023-09-18 | 2023-10-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Active flow control structure based on rapid height Wen Wenchang and preparation method |
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| FR2964739A1 (en) * | 2010-09-15 | 2012-03-16 | Snecma | Protective air intake grid for use in test bench used to test e.g. turbojet engine of aircraft, has vibrator vibrating cables, where cables are tensioned such that frequency of vibrator corresponds to frequency of cable vibration mode |
| CN204116013U (en) * | 2014-10-16 | 2015-01-21 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of skates test unit |
| CN206019984U (en) * | 2016-08-23 | 2017-03-15 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of separate type skates assay device |
| CN208155559U (en) * | 2018-03-09 | 2018-11-27 | 吉林大学 | A kind of artificial porous barrier model orientation mounting device for wind tunnel test |
| CN208270170U (en) * | 2018-03-28 | 2018-12-21 | 中国航天空气动力技术研究院 | A kind of position control and protective device of the reverse-flow type Asia across super wind-tunnel increment injector |
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2019
- 2019-01-22 CN CN201910057693.0A patent/CN109677632B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2964739A1 (en) * | 2010-09-15 | 2012-03-16 | Snecma | Protective air intake grid for use in test bench used to test e.g. turbojet engine of aircraft, has vibrator vibrating cables, where cables are tensioned such that frequency of vibrator corresponds to frequency of cable vibration mode |
| CN204116013U (en) * | 2014-10-16 | 2015-01-21 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of skates test unit |
| CN206019984U (en) * | 2016-08-23 | 2017-03-15 | 中国空气动力研究与发展中心低速空气动力研究所 | A kind of separate type skates assay device |
| CN208155559U (en) * | 2018-03-09 | 2018-11-27 | 吉林大学 | A kind of artificial porous barrier model orientation mounting device for wind tunnel test |
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| CN109677632A (en) | 2019-04-26 |
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