CN106768811B - High-frequency induction wind tunnel vacuum pressure regulating system and pressure regulating method - Google Patents
High-frequency induction wind tunnel vacuum pressure regulating system and pressure regulating method Download PDFInfo
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- CN106768811B CN106768811B CN201710104210.9A CN201710104210A CN106768811B CN 106768811 B CN106768811 B CN 106768811B CN 201710104210 A CN201710104210 A CN 201710104210A CN 106768811 B CN106768811 B CN 106768811B
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- 230000006698 induction Effects 0.000 title claims abstract description 32
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 10
- 230000033228 biological regulation Effects 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 238000012360 testing method Methods 0.000 claims description 30
- 230000003068 static effect Effects 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 6
- 230000003584 silencer Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
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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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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The high-frequency induction wind tunnel vacuum pressure regulating system comprises a 200 liter/second vacuum pump, a 300 liter/second vacuum pump, a 600 liter/second vacuum pump, a 1800 liter/second vacuum pump, a 5000 liter/second vacuum pump, a low vacuum baffle valve, a high vacuum baffle valve, a vacuum gauge, a doping valve, a first pressure sensor, a second pressure sensor and an electric stop valve. When the high-frequency induction wind tunnel needs low vacuum degree (namely 20-100 kpa), the first three groups of vacuum pumps with smaller pumping force operate; when the high-frequency induction wind tunnel needs high vacuum degree (namely less than or equal to 20 kpa), five groups of vacuum pumps run simultaneously, so that the maximum suction force is realized, and the wind tunnel running requirement is met. The invention is mainly applied to the vacuum pressure regulation of the high-frequency induction wind tunnel, and realizes the technical requirements of high-power ignition, long-time operation and the like of the high-frequency induction heating wind tunnel.
Description
Technical Field
The invention relates to a high-frequency induction wind tunnel vacuum pressure regulating system and a pressure regulating method, and belongs to the technical field of aerospace ground simulation test wind tunnels.
Background
The high-frequency induction heating wind tunnel is a novel ground heat-proof test platform developed for meeting the requirements of high enthalpy and high heat flow, has the characteristics of stable flow field, pure heating gas, high enthalpy and the like, and is a novel spaceflight ground heat-proof simulation test technology. To ensure the operation of this wind tunnel, vacuum conditions are one of the determining factors. The control method for the high-frequency induction wind tunnel vacuum pressure regulation is a key technology for ensuring the ignition and operation of the test.
Because the high-frequency induction wind tunnel needs high vacuum starting and needs long-time test in a low vacuum environment, most of the high-frequency induction wind tunnels in the prior art cannot meet the high vacuum starting under 100Pa, main body devices of the heater can be damaged frequently, and the ignition success rate is low. When ignition is successful, the prior art cannot adjust the vacuum environment in time (namely, freely switch between high vacuum and low vacuum), so that the test cannot reach all parameter states required.
Disclosure of Invention
The technical solution of the invention is as follows: the vacuum pressure regulating system and the pressure regulating method for the high-frequency induction wind tunnel are provided for overcoming the defects of the prior art, realizing the vacuum test environment required by the high-frequency induction heating wind tunnel, being capable of freely switching between high vacuum and low vacuum, and ensuring smooth ignition and stable operation of long-time test.
The technical scheme of the invention is as follows: the high-frequency induction wind tunnel vacuum pressure regulating system comprises a 200 liter/second vacuum pump, a 300 liter/second vacuum pump, a 600 liter/second vacuum pump, a 1800 liter/second vacuum pump, a 5000 liter/second vacuum pump, a low vacuum baffle valve, a high vacuum baffle valve, a vacuum gauge, a doping valve, a first pressure sensor, a second pressure sensor and an electric stop valve;
the high-frequency induction wind tunnel is connected with one end of a vacuum gauge through a pipeline, the other end of the vacuum gauge is connected with one end of an air mixing valve and an inlet of a high-vacuum baffle valve at the same time, an outlet of the high-vacuum baffle valve is sequentially connected with a 5000 liter/second vacuum pump and a 1800 liter/second vacuum pump through pipelines, the 1800 liter/second vacuum pump is connected with one outlet of a low-vacuum baffle valve, the other end of the air mixing valve is connected with an inlet of the low-vacuum baffle valve, and the other outlet of the low-vacuum baffle valve is sequentially connected with a 600 liter/second vacuum pump, a 300 liter/second vacuum pump and a 200 liter/second vacuum pump through pipelines, and the 200 liter/second vacuum pump is connected with the atmosphere through a silencer;
the water storage tank is connected with the water inlets of the 300 liter/second vacuum pump and the 1800 liter/second vacuum pump through a water inlet pipeline, the water inlet pipeline is sequentially provided with a first pressure sensor, an electric stop valve and a second pressure sensor, the water outlet of the 1800 liter/second vacuum pump is connected with the water inlet of the 600 liter/second vacuum pump, the water outlet of the 300 liter/second vacuum pump is connected with the water inlet of the 200 liter/second vacuum pump, and the water outlet of the 600 liter/second vacuum pump and the water outlet of the 200 liter/second vacuum pump are connected with the water storage tank through water outlet pipelines.
The intelligent vacuum pump also comprises an upper computer control system, a PLC, a temperature sensor and a pressure sensor, wherein the PLC collects current and voltage data of each vacuum pump and transmits the current and voltage data to the upper computer control system, the temperature sensor collects temperature of each vacuum pump and transmits the temperature data to the upper computer control system, the pressure sensor collects cooling water pressure of each vacuum pump, and the upper computer control system alarms when the current, voltage, temperature or cooling water pressure of the vacuum pump exceeds a preset threshold value.
The vacuum pressure regulating system is designed with shielding and isolating measures for preventing electromagnetic interference, and photoelectric isolating modules are designed between the vacuum pump and the PLC, between the PLC and the temperature sensor and between the PLC and the pressure sensor.
The vacuum pump also comprises a variable frequency parameter control module which is used for setting or changing variable frequency parameters of each vacuum pump.
The method for performing pressure regulation by using the vacuum pressure regulation system comprises the following steps:
(5.1) when the low vacuum mode is operated, opening a low vacuum baffle valve, closing a high vacuum baffle valve, opening a 200 liter/second vacuum pump to enable the vacuum degree of a test section to be 40-50 Kpa, opening a 300 liter/second vacuum pump, enabling the static pressure of the test section to be stabilized at 20-30 Kpa when the vacuum degree of the test section is 20-600 Kpa, and opening a 600 liter/second vacuum pump;
and (5.2) when the high vacuum mode is operated, repeating the step (5.1), closing the low vacuum baffle valve when the static pressure of the test section is stabilized at 20Kpa, opening the high vacuum baffle valve, opening the 1800 liter/second vacuum pump, opening the 5000 liter/second vacuum pump when the vacuum degree of the test section is below 0.8Kpa and is stable, and pumping the vacuum pump set to the equipment extreme vacuum.
And (3) the ultimate vacuum pressure of the equipment in the step (5.2) is less than or equal to 100Pa.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, through a double-passage design, two modes of low vacuum operation and high vacuum operation are realized, and the static pressure requirements under various requirements of the high-frequency induction wind tunnel are met. The common vacuum pump set has only a single channel mode, does not have the mutual switching of the two modes, and cannot meet the test requirement of the high-frequency induction wind tunnel.
(2) According to the invention, through the design of electromagnetic interference prevention on the vacuum pump, normal operation under a high-frequency interference environment is satisfied, and special electromagnetic shielding material wrapping is performed on the control core part and the part close to the high-frequency induction equipment. Compared with a common vacuum pump set, the electromagnetic interference can cause the failure or damage of the control module in the unprotected state, so that the unit can not normally operate.
(3) The static pressure of the vacuum pump set used in the invention can reach below 100Pa through the actual measurement of the high vacuum mode, so as to meet the test requirement of a high-frequency induction wind tunnel.
Drawings
FIG. 1 is a schematic diagram of the design of the present invention.
Detailed Description
As shown in fig. 1, the high-frequency induction wind tunnel vacuum pressure regulating system of the present invention comprises a 200 liter/sec vacuum pump 1, a 300 liter/sec vacuum pump 2, a 600 liter/sec vacuum pump 3, an 1800 liter/sec vacuum pump 4, a 5000 liter/sec vacuum pump 5, a low vacuum flapper valve 6, a high vacuum flapper valve 7, a vacuum gauge 8, an air-entraining valve 9, a first pressure sensor 10, a second pressure sensor 11, and an electric shut-off valve 12.
The high-frequency induction wind tunnel is connected with one end of a vacuum gauge 8 through a pipeline, the other end of the vacuum gauge 8 is simultaneously connected with one end of an air entrainment valve 9 and the inlet of a high-vacuum baffle valve 7, the outlet of the high-vacuum baffle valve 7 is sequentially connected with a 5000 liter/second vacuum pump 5 and a 1800 liter/second vacuum pump 4 through pipelines, the 1800 liter/second vacuum pump 4 is connected with one outlet of a low-vacuum baffle valve 6, the other end of the air entrainment valve 9 is connected with the inlet of the low-vacuum baffle valve 6, the other outlet of the low-vacuum baffle valve 6 is sequentially connected with 600 liter/second vacuum pumps 3, 300 liter/second vacuum pumps 2 and 200 liter/second vacuum pumps 1 through pipelines, and the 200 liter/second vacuum pump 1 is communicated with the atmosphere through a silencer;
the water storage tank is connected with water inlets of the 300 liter/second vacuum pump 2 and the 1800 liter/second vacuum pump 4 through a water inlet pipeline, a first pressure sensor 10, an electric stop valve 12 and a second pressure sensor 11 are sequentially arranged on the water inlet pipeline, a water outlet of the 1800 liter/second vacuum pump 4 is connected with a water inlet of the 600 liter/second vacuum pump 3, a water outlet of the 300 liter/second vacuum pump 2 is connected with a water inlet of the 200 liter/second vacuum pump 1, and a water outlet of the 600 liter/second vacuum pump 3 and a water outlet of the 200 liter/second vacuum pump 1 are connected with the water storage tank through water outlet pipelines.
The current and voltage data acquisition of each vacuum pump is connected into an upper computer control system through a PLC, and the upper computer control system sets an upper limit value for early warning. The cooling water pressure of the vacuum pump is collected by the pressure sensor and then connected to the upper computer control system, the temperature of the vacuum pump is collected by the temperature sensor and then connected to the upper computer control system, and the upper computer control system sets an upper limit value for early warning. All data are collected in real time to form a document for storage.
Each vacuum pump adopts an electromagnetic interference protection design, and a photoelectric isolation module is designed between the vacuum pump and the PLC and between the PLC and each sensor, a signal path adopts a metal shielding wire, and important parts such as various sensors, data acquisition equipment, a control chip and the like are wrapped by adopting special electromagnetic shielding materials.
The invention is further provided with a variable frequency parameter control module which is used for setting or changing variable frequency parameters of each vacuum pump so as to ensure high-precision adjustment.
The operation index of the low vacuum mode is that the test vacuum environment is 20-100 kpa; high vacuum mode operation index: the test vacuum environment is less than or equal to 20kpa. When the high-frequency induction wind tunnel needs low vacuum degree (namely 20-100 kpa), the first three groups of vacuum pumps with smaller pumping force operate; when the high-frequency induction wind tunnel needs high vacuum degree (namely less than or equal to 20 kpa), five groups of vacuum pumps run simultaneously, so that the maximum suction force is realized, and the wind tunnel running requirement is met. Specifically, the vacuum pressure adjusting method of the present invention is as follows:
when the low vacuum mode is operated, the low vacuum baffle valve 6 is opened, the high vacuum baffle valve 7 is closed, the 200 liter/second vacuum pump 1 is opened, the vacuum degree of the test section reaches a section of 40-50 Kpa, the 300 liter/second vacuum pump 2 is opened, the vacuum degree of the test section reaches a section of 20-30 Kpa, the 600 liter/second vacuum pump 3 is opened, the static pressure of the test section is stabilized at 20Kpa, and the low vacuum mode condition is met.
And when the high vacuum mode is operated, repeating the low vacuum mode operation, closing the low vacuum baffle valve 6 when the static pressure of the section to be tested is stabilized at 20Kpa, opening the high vacuum baffle valve 7, opening the 1800L/s vacuum pump 4, enabling the vacuum degree of the section to be tested to be below 0.8Kpa and stable and unchanged, and opening the 5000L/s vacuum pump 5. Under the condition of not changing the variable frequency parameters, the vacuum pump set pumps air to the device extreme vacuum (actually measured is less than or equal to 100 Pa).
In order to further improve the automation degree of the system, the vacuum pressure regulating system of the invention has a high vacuum automatic control mode besides the manual step-by-step starting mode in the high vacuum operation mode. In the high vacuum automatic control mode, each group of pumps of the 200 liter/second vacuum pump, the 300 liter/second vacuum pump, the 600 liter/second vacuum pump, the 1800 liter/second vacuum pump and the 5000 liter/second vacuum pump can be started and stopped by directly clicking corresponding icons. And the next group of vacuum pump sets can be started automatically by clicking a high vacuum starting button under the condition of completing self-starting of each group of pumps, so that all the five groups of pumps are started sequentially. The start and stop of each group of pumps are connected with a control panel through a PLC and controlled by an operation interface of an upper computer, and meanwhile, a test site is provided with direct mechanical control of an operation cabinet. In the high vacuum automatic control mode, only the high vacuum automatic control 8 is clicked in the stop state, and the system automatically completes the starting operation of the high vacuum mode to reach the ultimate vacuum degree and stabilize the pressure. Under the high vacuum mode, the variable frequency parameters are changed, so that the vacuum unit can keep the vacuum pressure value at any parameter within the range below 5 Kpa.
The invention adopts a double-passage design of a high vacuum mode and a low vacuum mode, a branch passage is arranged between a 600 liter/second vacuum pump and a 1800 liter/second vacuum pump, the two passages are isolated by a baffle valve, the baffle valve is opened in the low vacuum mode, and the baffle valve is closed in the high vacuum state; the flapper valve is arranged behind the 5000L/s vacuum pump, and is closed in a low vacuum mode and opened in a high vacuum state. The two passages are simultaneously connected with the high-frequency induction wind tunnel body. When three groups of vacuum pumps with smaller suction quantity are operated, stable operation of low vacuum is realized; through the operation of the two groups of baffle valves, the air channel is changed, five groups of vacuum pumps are operated simultaneously, the maximum vacuum pumping quantity is achieved, and the high vacuum state of the wind tunnel is realized. In the high vacuum mode, accurate adjustment of the high vacuum degree is realized by adjusting a frequency converter of a 5000 liter/second vacuum pump. Meanwhile, modern design is added, and free switching between automatic control and manual control is realized. By monitoring signals such as the voltage, the current, the cooling water temperature and the like of each group of vacuum pumps, the real-time monitoring of the running state is realized, and necessary running guarantee is provided for the test running. The high-frequency induction technology has the characteristic of strong electromagnetic interference, and can generate heating and strong model interference on surrounding metals and conductors.
The invention can realize the vacuum test environment required by the high-frequency induction heating wind tunnel, and ensure the smooth ignition and the stable operation of long-time test. Meanwhile, the vacuum environment in the cavity is accurately adjusted according to the test requirement, and all vacuum parameters in the running process are monitored and early-warned. Aiming at the characteristic of strong electromagnetic interference of a high-frequency induction wind tunnel, electromagnetic interference prevention shielding and isolation measures are carried out in the design, and the interference and distortion of signals are solved. The invention has been proved by tests, can meet the vacuum pressure requirement of the high-frequency induction wind tunnel, and has important application in the field of aeronautical weather dynamic heat test.
The invention is not described in detail in the field of technical personnel common knowledge.
Claims (4)
1. The high-frequency induction wind tunnel vacuum pressure regulating system is characterized in that: the vacuum pump comprises a 200 liter/second vacuum pump (1), a 300 liter/second vacuum pump (2), a 600 liter/second vacuum pump (3), an 1800 liter/second vacuum pump (4), a 5000 liter/second vacuum pump (5), a low vacuum baffle valve (6), a high vacuum baffle valve (7), a vacuum gauge (8), an air-entraining valve (9), a first pressure sensor (10), a second pressure sensor (11) and an electric stop valve (12);
the high-frequency induction wind tunnel is connected with one end of a vacuum gauge (8) through a pipeline, the other end of the vacuum gauge (8) is simultaneously connected with one end of an air entrainment valve (9) and an inlet of a high-vacuum baffle valve (7), an outlet of the high-vacuum baffle valve (7) is sequentially connected with a 5000 liter/second vacuum pump (5) and a 1800 liter/second vacuum pump (4) through pipelines, the 1800 liter/second vacuum pump (4) is connected with one outlet of a low-vacuum baffle valve (6), the other end of the air entrainment valve (9) is connected with an inlet of the low-vacuum baffle valve (6), the other outlet of the low-vacuum baffle valve (6) is sequentially connected with a 600 liter/second vacuum pump (3), a 300 liter/second vacuum pump (2) and a 200 liter/second vacuum pump (1) through pipelines, and the 200 liter/second vacuum pump (1) is connected with the atmosphere through a silencer;
the water storage tank is connected with water inlets of a 300 liter/second vacuum pump (2) and a 1800 liter/second vacuum pump (4) through a water inlet pipeline, a first pressure sensor (10), an electric stop valve (12) and a second pressure sensor (11) are sequentially arranged on the water inlet pipeline, a water outlet of the 1800 liter/second vacuum pump (4) is connected with a water inlet of a 600 liter/second vacuum pump (3), a water outlet of the 300 liter/second vacuum pump (2) is connected with a water inlet of a 200 liter/second vacuum pump (1), and a water outlet of the 600 liter/second vacuum pump (3) and a water outlet of the 200 liter/second vacuum pump (1) are connected with the water storage tank through water outlet pipelines;
the system also comprises an upper computer control system, a PLC, a temperature sensor and a pressure sensor, wherein the PLC collects current and voltage data of each vacuum pump and transmits the current and voltage data to the upper computer control system, the temperature sensor collects the temperature of each vacuum pump and transmits the temperature to the upper computer control system, the pressure sensor collects cooling water pressure of each vacuum pump, and the upper computer control system alarms when the current, voltage, temperature or cooling water pressure of the vacuum pump exceeds a preset threshold value;
the vacuum pump also comprises a variable frequency parameter control module which is used for setting or changing variable frequency parameters of each vacuum pump.
2. The high frequency induction wind tunnel vacuum pressure regulating system of claim 1, wherein: the vacuum pressure regulating system is designed with shielding and isolating measures for preventing electromagnetic interference, and photoelectric isolating modules are designed between the vacuum pump and the PLC, between the PLC and the temperature sensor and between the PLC and the pressure sensor.
3. A method of pressure regulation using the vacuum pressure regulation system of claim 1, comprising the steps of:
(5.1) when the low vacuum mode is operated, opening a low vacuum baffle valve (6), closing a high vacuum baffle valve (7), opening a 200 liter/second vacuum pump (1), enabling the vacuum degree of a test section to be 40-50 Kpa, opening a 300 liter/second vacuum pump (2), enabling the vacuum degree of the test section to be 20-30 Kpa, and opening a 600 liter/second vacuum pump (3), enabling the static pressure of the test section to be stabilized at 20Kpa;
and (5.2) repeating the step (5.1) when the high vacuum mode is operated, closing the low vacuum baffle valve (6) when the static pressure of the section to be tested is stabilized at 20Kpa, opening the high vacuum baffle valve (7), opening the 1800 liter/second vacuum pump (4), opening the 5000 liter/second vacuum pump (5) when the vacuum degree of the section to be tested is below 0.8Kpa and is stable, and pumping the vacuum pump set to the device extreme vacuum.
4. A method according to claim 3, characterized in that: and (3) the ultimate vacuum pressure of the equipment in the step (5.2) is less than or equal to 100Pa.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110362123B (en) * | 2019-07-08 | 2021-01-19 | 华中科技大学 | Hypersonic velocity temporary impulse type wind tunnel start-stop control system and method |
| CN111679703A (en) * | 2020-07-07 | 2020-09-18 | 中国空气动力研究与发展中心超高速空气动力研究所 | Temperature protection control system of centrifugal vacuum pump and control method thereof |
| CN114509231B (en) * | 2021-12-30 | 2024-10-15 | 北京航天益森风洞工程技术有限公司 | Wind tunnel operation system and wind tunnel operation method based on wind tunnel operation system |
| CN118294099B (en) * | 2024-06-05 | 2024-09-27 | 中国空气动力研究与发展中心超高速空气动力研究所 | Electromagnetic separation device and separation method for hypersonic wind tunnel model free flight test |
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