CN115542974A - Air bridge temperature control device for dynamic simulation wind tunnel test - Google Patents
Air bridge temperature control device for dynamic simulation wind tunnel test Download PDFInfo
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- CN115542974A CN115542974A CN202211487072.4A CN202211487072A CN115542974A CN 115542974 A CN115542974 A CN 115542974A CN 202211487072 A CN202211487072 A CN 202211487072A CN 115542974 A CN115542974 A CN 115542974A
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- air bridge
- temperature control
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- temperature
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses an air bridge temperature control device for a dynamic simulation wind tunnel test, which comprises an air bridge flexible joint, flexible heating sheets, temperature sensors and a temperature control system which are integrally arranged, wherein the air bridge flexible joint comprises an inner ring, an outer ring and a key beam for connecting the inner ring and the outer ring, the two outer ring surfaces of the air bridge flexible joint are respectively provided with one flexible heating sheet, the inner ring surface of the air bridge flexible joint is at least provided with four flexible heating sheets, the two ends of the key beam are respectively provided with one temperature sensor, and the temperature control system is respectively and electrically connected with the flexible heating sheets and the temperature sensors. The temperature of the two ends of the key beam of the flexible joint of the air bridge can be independently controlled, the temperature gradient of the two ends of the key beam is controlled in a stable interval, the additional force generated by the thermal deformation of the key beam is reduced, the measurement accuracy of the balance is improved, and the problems that the temperature gradient of the two ends of the key beam of the flexible joint of the air bridge is large and the influence on the balance is large when high-pressure air supply is stopped in a traditional temperature control method are solved.
Description
Technical Field
The invention relates to the field of wind tunnel tests, in particular to an air bridge temperature control device for a dynamic simulation wind tunnel test.
Background
In order to reduce the structural quality and improve the effective load, the power device (turbofan, propeller and the like) of the modern transport vehicle mostly adopts a near-coupling installation mode, and a very complex interference flow field exists between the power device and the machine body. Modern aircraft design develops an aircraft/engine integrated design method, and the design method plays an important role in improving the performance and safety of the aircraft. The airplane power simulation test in the wind tunnel is a main means for developing the airplane/engine integrated design.
In order to drive the engine simulator, a special pipeline is needed to transmit high-pressure air, but a rigid pipeline has a great influence on a balance, so that an air bridge is needed to transmit the high-pressure air. The air bridge crosses two ends of the balance and consists of a flexible joint and a connecting pipeline, and a key beam of the flexible joint has certain degree of freedom, so that the influence of an air supply pipeline on the balance can be reduced.
In the engine power simulation test, because the high-pressure air expands in the power simulator to do work, the phenomenon of water vapor condensation and even icing can occur at the outlet of the power simulator, and the test safety and the test result reliability are influenced. In order to avoid the phenomenon, high-pressure air is required to be heated (the highest temperature can reach 70 ℃), and after the heated high-pressure air passes through the air bridge, the temperature gradient at two ends of a key beam of the flexible joint reaches more than 30 ℃ due to uneven heating of the flexible joint of the air bridge, so that the key beam is subjected to large thermal deformation and generates large additional force, and the balance measurement accuracy is greatly influenced.
The traditional temperature control method is that before the test, heated high-pressure air is used for preheating the air bridge, after the temperature of the air bridge is stable, air supply is stopped, the initial reading of the balance is collected, then air is blown by a wind tunnel, air supply is repeated, the number of blown air of the balance is collected, and the test is completed. This method has the following disadvantages: after the air supply is stopped, the temperature of the air bridge pipeline can be rapidly reduced, so that the temperature of the outer side (one side of an outer ring of the flexible joint) of the key beam of the flexible joint is rapidly reduced, the inner side (one side of an inner ring of the flexible joint) of the key beam of the flexible joint is only conducted by the key beam, the heat conducting area is small, the temperature is slowly reduced, the temperature difference of the two sides of the key beam of the air bridge is still large when the balance collects initial readings, and the measurement error of the balance is large.
Disclosure of Invention
The invention aims to provide an air bridge temperature control device for a dynamic simulation wind tunnel test, which is used for controlling the temperature of two ends of a key beam of a flexible joint of an air bridge in a stable interval in the dynamic simulation wind tunnel test and solving the problem that the temperature gradient of the key beam of the flexible joint of the air bridge is large and the generated additional force has large influence on a balance when high-pressure air supply is stopped in the traditional temperature control method.
In order to achieve the purpose, the invention adopts the technical scheme that:
an air bridge temperature control device for a dynamic simulation wind tunnel test comprises an air bridge flexible joint, a flexible heating sheet, a temperature sensor and a temperature control system which are integrally arranged,
the air bridge flexible joint comprises an inner ring, an outer ring and a key beam for connecting the inner ring and the outer ring,
the two outer ring surfaces of the air bridge flexible joint are respectively provided with a flexible heating sheet, the inner ring surface of the air bridge flexible joint is at least provided with four flexible heating sheets,
two ends of the key beam are respectively provided with a temperature sensor,
and the temperature control system is electrically connected with the flexible heating sheet and the temperature sensor respectively.
In the technical scheme, the flexible heating sheets are embedded in the outer surfaces of the outer ring and the inner ring, and the temperature sensors are embedded in the outer surfaces of two ends of the key beam.
In the above technical solution, the mounting surfaces corresponding to the flexible heating sheet and the temperature sensor are respectively provided with a groove, and the flexible heating sheet and the temperature sensor are embedded into the grooves.
In the above technical solution, the flexible heating sheet on the outer ring and the flexible heating sheet on the inner ring are respectively and independently electrically connected to the temperature control system, and the heating operations of the flexible heating sheet on the outer ring and the flexible heating sheet on the inner ring are not interfered with each other.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the temperature of the two ends of the key beam of the flexible joint of the air bridge can be independently controlled, the temperature gradient of the two ends of the key beam is controlled in a stable interval, the additional force generated by the thermal deformation of the key beam is reduced, the measurement accuracy of the balance is improved, and the problems that the temperature gradient of the two ends of the key beam of the flexible joint of the air bridge is large and the influence on the balance is large when high-pressure air supply is stopped in a traditional temperature control method are solved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of the installation of a temperature control device on an air bridge flexible joint;
FIG. 2 is a schematic diagram of an air bridge temperature control system;
FIG. 3 is a graph comparing the effect of the present embodiment with that of the prior art;
wherein: 1 is an inner ring, 2 is an outer ring, 3 is a key beam, 4 is an inner ring heating plate, 5 is an outer ring heating plate, 6 is an inner ring temperature sensor, and 7 is an outer ring temperature sensor.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example one
As shown in fig. 1, the flexible joint of the air bridge is a schematic structural diagram, and the flexible joint includes two outer rings 2 and an inner ring 1 disposed between the two outer rings 2, and the outer rings 2 and the inner ring 1 are connected by a key beam 3.
In this embodiment, the structure of the flexible joint is improved, an inner ring heating plate 4 is arranged on the surface of the inner ring 1, an outer ring heating plate 5 is arranged on the connecting surface of the outer ring 2, and an inner ring temperature sensor 6 and an outer ring temperature sensor 7 are arranged at the positions, close to the inner ring 1 and the outer ring 2, at the two ends of the key beam 3 respectively. The temperature feedback collection is carried out on the inner ring temperature sensor 6 and the outer ring temperature sensor 7 through a temperature control system, and the inner ring heating plate 4 and the outer ring heating plate 5 are controlled to be heated respectively.
Due to the structural and functional limitations of the flexible joint, at least four key beams 3 are connected with the inner ring 1 between the two outer rings 2, so that at least four inner ring heating plates 4 are required in the embodiment.
Example two
On the basis of the first embodiment, the structure of the flexible joint is improved again, the connecting surface of the outer ring 2 is provided with a groove, and the outer ring heating plate 5 is embedded into the connecting surface of the outer ring 2. Similarly, a groove is arranged on the surface of the inner ring 1, and the inner ring heating plate 4 is embedded into the surface of the inner ring 1. And grooves are arranged at two ends of the key beam 3, and the temperature sensor is embedded into the grooves.
The arrangement of this embodiment makes after having increased temperature sensor and heating plate on flexible festival, the overall flexible festival itself's appearance shape does not change, does not influence the installation and the use of flexible festival.
As shown in fig. 2, in the first and second embodiments, the temperature control system is installed outside the wind tunnel and connected to the flexible heating sheet and the temperature sensor through the interface. The temperature control system consists of an intelligent temperature controller and a power regulator, and can independently control the flexible heating sheets of the outer ring and the inner ring of the flexible joint. The temperature control principle is that the output power of the power regulator is controlled by an intelligent temperature controller, and the heating power of the flexible heating sheet is controlled, so that the temperature is controlled.
When in use, the highest temperature range is preset in the temperature control system（T 0 ，T 1 ) When the temperature sensor monitors the temperature T Monitor for ＜T 0 When the temperature control system controls the flexible heating sheet to heat the air bridge flexible joint, the control rule is along with delta T (delta T = T) Monitor for -T 0 ) Reducing, and gradually reducing the power of the heating system; when T is 0 ≤T Monitor for ≤T 1 In time, the temperature control system controls the power stability of the flexible heating sheet and maintains T Monitor for In (T) 0 ，T 1 ) An internal change; when T is Monitor for ＞T 1 When the temperature control system controls the flexible heating sheet to stop heating, when T is reached Monitor for ≤T 1 And then the flexible heating sheet is started to heat.
Temperature feedback collection is carried out through inner ring temperature sensor 6 and outer loop temperature sensor 7, and inner ring heating plate 4 and outer loop heating plate 5 are heated respectively, can realize the holistic temperature stability control of air bridge. As shown in FIG. 3, fx/N: the balance measures the axial force Fx, in newtons (N), Δ t/° c: air bridge circuit temperature change Δ t in degrees Celsius (C.). The mode of this embodiment is adopted to the control effect contrast of air bridge in certain equipment, can see from the picture that, after using the controlling means of this embodiment, compare traditional temperature control method, air bridge temperature variation has reduced about 85% to the balance influence volume, has greatly improved the precision of balance measurement.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (4)
1. The utility model provides an air bridge temperature control device of power simulation wind tunnel test which characterized in that: comprises an air bridge flexible joint, a flexible heating sheet, a temperature sensor and a temperature control system which are arranged integrally,
the air bridge flexible joint comprises an inner ring, an outer ring and a key beam for connecting the inner ring and the outer ring,
the two outer ring surfaces of the air bridge flexible joint are respectively provided with a flexible heating sheet, the inner ring surface of the air bridge flexible joint is at least provided with four flexible heating sheets,
two ends of the key beam are respectively provided with a temperature sensor,
and the temperature control system is electrically connected with the flexible heating sheet and the temperature sensor respectively.
2. The air bridge temperature control device for the dynamic simulation wind tunnel test according to claim 1, characterized in that: the flexible heating plate is embedded in the outer surfaces of the outer ring and the inner ring, and the temperature sensors are embedded in the outer surfaces of two ends of the key beam.
3. The air bridge temperature control device for the dynamic simulation wind tunnel test according to claim 2, characterized in that: the flexible heating plate and the temperature sensor are respectively provided with a groove on the corresponding mounting surface, and the flexible heating plate and the temperature sensor are embedded into the grooves.
4. The air bridge temperature control device for the dynamic simulation wind tunnel test according to claim 1, characterized in that: the flexible heating sheets on the outer ring and the flexible heating sheets on the inner ring are respectively and independently electrically connected to a temperature control system, and the heating work of the flexible heating sheets on the outer ring and the heating work of the flexible heating sheets on the inner ring are not interfered with each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211487072.4A CN115542974B (en) | 2022-11-25 | 2022-11-25 | Air bridge temperature control device for dynamic simulation wind tunnel test |
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| CN202211487072.4A CN115542974B (en) | 2022-11-25 | 2022-11-25 | Air bridge temperature control device for dynamic simulation wind tunnel test |
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| CN115542974A true CN115542974A (en) | 2022-12-30 |
| CN115542974B CN115542974B (en) | 2023-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116107366A (en) * | 2023-04-07 | 2023-05-12 | 中国空气动力研究与发展中心低速空气动力研究所 | Temperature control method, controller and device |
| CN118067355A (en) * | 2024-04-18 | 2024-05-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Low-temperature balance loading head with temperature self-compensation function and application method |
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| CN114323540A (en) * | 2021-12-01 | 2022-04-12 | 中国空气动力研究与发展中心低速空气动力研究所 | Half-mode blowing lift-increasing wind tunnel test method and device for conveyor |
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2022
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| US4663967A (en) * | 1985-06-14 | 1987-05-12 | Dei-East Inc. | Air flow system bypassing a balance in a model airplane being tested in a wind tunnel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116107366A (en) * | 2023-04-07 | 2023-05-12 | 中国空气动力研究与发展中心低速空气动力研究所 | Temperature control method, controller and device |
| CN116107366B (en) * | 2023-04-07 | 2023-06-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Temperature control method, controller and device |
| CN118067355A (en) * | 2024-04-18 | 2024-05-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Low-temperature balance loading head with temperature self-compensation function and application method |
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| CN115542974B (en) | 2023-03-17 |
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