CN109738150A - A kind of low speed reflux small wind speed accuracy control method of wind-tunnel - Google Patents
A kind of low speed reflux small wind speed accuracy control method of wind-tunnel Download PDFInfo
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- CN109738150A CN109738150A CN201910070757.0A CN201910070757A CN109738150A CN 109738150 A CN109738150 A CN 109738150A CN 201910070757 A CN201910070757 A CN 201910070757A CN 109738150 A CN109738150 A CN 109738150A
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Abstract
A kind of low speed reflux small wind speed accuracy control method of wind-tunnel, step are as follows: process air vent in stable section hole wall；Sealing strip is installed in air vent two sides；Production discharge quantity control sleeve simultaneously installs guide rail；Rack gear is installed；It sets up stepper motor and gear is installed, step motor control end is connected with wind tunnel system computer；Wind speed probe is installed in test chamber, wind speed probe is connected by micro-pressure sensor with computer；Air vent is isolated from the outside by discharge quantity control sleeve；Start wind-tunnel; measure the actual wind speed in test chamber; actual wind speed and wind speed setting are compared by computer; control instruction is issued from computer to stepper motor, it is mobile by stepper motor driving discharge quantity control sleeve, so that air vent is in communication with the outside; the air vent area that is in communication with the outside at the uniform velocity increases; actual wind speed will be gradually reduced in test chamber, when the actual wind speed in test chamber reaches wind speed setting, stepper motor hard stop.
Description
Technical field
The invention belongs to wind tunnel technique fields, more particularly to a kind of low speed reflux small wind speed precision controlling side of wind-tunnel
Method.
Background technique
Wind-tunnel is a kind of duct-like experimental facilities, can generate and control air-flow by manual type, winged for simulating
The mobility status of row device or entity ambient gas, and air-flow can be measured to the function and effect of entity and observation physical phenomenon.Wind
Hole experiment is indispensable component part in aircraft development work, not only in the research and development of aerospace engineering
In play an important role, with the development of industrial aerodynamics, the fields such as communications and transportation, building construction, wind energy utilization more
It is indispensable.When carrying out wind tunnel experiment, often model or material object are fixed in wind-tunnel and dried repeatedly, measurement and control instrument is passed through
Device and equipment obtain experimental data, and to keep experimental result accurate, flowing when experiment must be similar to practical flow regime, i.e., must
The requirement of the law of similitude must be met.But due to the limitation of tunnel size and power, all phases are simulated simultaneously in a wind-tunnel
Be like parameter it is highly difficult, usually by the project to be studied, select some to influence maximum similar parameters and simulated.This
Outside, the flow field quality of test chamber, as the Velocity Profiles uniformity, mean air flow direction deviate wind-tunnel axis size,
The uniformity, the turbulivity of air-flow etc. being distributed along the barometric gradient of wind-tunnel axis direction, section temperature have to comply with certain mark
Standard, and realizing the primary premise of these flow field qualities is wind tunnel speed control precision.
According to the difference of test chamber velocity interval, can be divided into low-speed wind tunnel (Ma≤0.3), subsonic wind tunnel (0.3≤
Ma≤0.8), transonic wind tunnel (0.8≤Ma≤1.4), supersonic wind tunnel (1.5≤Ma≤5.0) and hypersonic wind tunnel etc..
Low-speed wind tunnel is segmented into direct current wind-tunnel and reflux wind-tunnel again, and the wind-tunnel that flows back is because its power is low, Flow Field Performance is good therefore extensive
Using.
By taking low speed flows back wind-tunnel as an example, speed is generally in 100m/s hereinafter, the control means applied at present mainly have frequency conversion
Speed regulating control and DC speed regulation control.Due to the development of current converter technique, frequency control is answered extensively in wind-tunnel control
With.The dynamical system fan of low speed reflux wind-tunnel is driven by AC asynchronous motor, and frequency control is by changing alternating current asynchronous electricity
The revolving speed of the input frequency control motor of motivation, to control the wind speed of test chamber.Since low speed reflux wind-tunnel passes through control
The revolving speed Control experiment section wind speed of asynchronous motor processed, and in the control range of 0~100m/s, it is difficult to meet each experiment wind
Speed is attained by required precision.
Since certain experiments have to carry out under small wind speed, such as the dust diffusion and flue dust diffusion in terms of environmental pollution
Deng experiment, generally require wind speed in 1m/s hereinafter, even lower in experiment.If the angle from control motor speed only only
It sets out, has been difficult to meet the control precision of small wind speed, and some people increase wind by being inserted into more damping screens in trial
The loss in hole, to realize the control precision for improving small wind speed, but actual result is unsatisfactory, and this method can not continuously adjust wind
Speed, and adjustable range is limited.
The blast velocity control part of traditional low speed reflux wind-tunnel is mainly by computer, capture card, photoisolator, frequency conversion
Device, fan motor, differential pressure pickup, signal conditioner, air velocity transducer and transmitter composition, implementation procedure are input setting wind
Speed value, computer calculates corresponding output digit signals using pid algorithm according to wind speed setting, then passes through D/A digital-to-analogue conversion
For analog signal amount, until capture card issues analog quantity voltage signal, analog quantity voltage signal enters photoisolator, passes through light
Electric isolator keeps apart low-voltage signal and high-voltage signal, and high-voltage signal is avoided to enter computer, and high-voltage signal passes through photoelectricity
Isolator is directly entered frequency converter, and frequency converter then changes the supply frequency of fan motor accordingly according to control signal, to realize
The change of motor speed, and then realize the change of wind speed.Simultaneously, air velocity transducer and transmitter are also ceaselessly acquiring wind
Ram compression difference signal, and this signal is sent back to computer, voltage signal is converted into wind speed again by computer, while the wind of measurement
Speed is made comparisons with wind speed setting, and finds out deviation, is recalled pid algorithm and is calculated the voltage that should be added up under corresponding deviation, in conjunction with
Output voltage exports new analog quantity voltage signal again, by repeating the above process constantly, until air speed value reaches
Wind speed setting value.
Above-mentioned blast velocity control mode is very applicable for the precision for controlling big wind speed, still, for controlling the precision of small wind speed
But it is no longer applicable in, precision controlling error is larger, and when the actual wind speed of small wind speed is lower than 3m/s, above-mentioned wind speed control system is even
It can not start.Therefore, it is necessary to find a kind of method that can be improved the low speed reflux small blast velocity control precision of wind-tunnel.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of low speed reflux small wind speed accuracy control method of wind-tunnel,
The flow field parameter that original low speed reflux wind-tunnel can not be changed, that is, can be improved the small blast velocity control precision of low speed reflux wind-tunnel, have
Effect has expanded the scope of experiment of low speed reflux wind-tunnel.
To achieve the goals above, the small wind speed precision control of wind-tunnel the present invention adopts the following technical scheme: a kind of low speed flows back
Method processed, includes the following steps:
Step 1: being first transformed stable section hole wall, processes air vent everywhere on the wall of stable section hole, deflates everywhere
Hole is evenly distributed on the wall of stable section hole；
Step 2: sealed groove is processed in the outer surface stable section Dong Bi of air vent two sides, then in sealed groove
Embedding sealing item；
Step 3: discharge quantity control sleeve is sleeved on the outside of the wall of stable section hole by one discharge quantity control sleeve of production,
Several guide rails are provided between discharge quantity control sleeve inner surface and the outer surface stable section Dong Bi, outside guide rail and stable section hole wall
Surface is fixedly connected, and discharge quantity control sleeve can be moved along guide rail；
Step 4: one toothed rack is installed in the outer surface of discharge quantity control sleeve, guarantees that rack gear is parallel with guide rail；
Step 5: it is fixed above rack gear to set up a stepper motor, a tooth is installed on the motor shaft of stepper motor
Wheel, guarantees that wheel and rack is meshed, then the control terminal of stepper motor is connected with the computer of wind tunnel system；
Step 6: installing wind speed probe in test chamber, and the data connector of wind speed probe is passed by micro-pressure-difference
Sensor is connected with computer, then install damping screen and honeycomb in the wall of stable section hole, and the wind-tunnel of low speed reflux at this time changes
Making work terminates；
Step 7: before wind-tunnel starting, stepper motor movement is first controlled, by wheel and rack engaged transmission, makes discharge quantity
Control sleeve is completely covered on the sealing strip of air vent two sides, and air vent at this time is completely isolated with the external world；
Step 8: starting wind-tunnel acquires the pressure difference signal of actual wind speed in test chamber by wind speed probe, then by micro-
Differential pressure pickup handles pressure difference signal, and treated, and pressure difference signal is transmitted directly to computer, and computer can be by pressure difference
Signal is compared with wind speed setting, while issuing control instruction from computer to stepper motor, and put by stepper motor driving
Tolerance control sleeve is mobile, and air vent is made to be in communication with the outside, and air vent at the uniform velocity increases with extraneous connection area, while
Under degassing, actual wind speed will be gradually reduced in test chamber, the actual wind speed in computer-made decision test chamber
When having reached wind speed setting, stepper motor hard stop keeps constant air vent with extraneous connection area.
Beneficial effects of the present invention:
The low speed reflux small wind speed accuracy control method of wind-tunnel of the invention, can not change the stream of original low speed reflux wind-tunnel
The small blast velocity control precision of low speed reflux wind-tunnel can be improved in field parameters, effectively expanded the scope of experiment of low speed reflux wind-tunnel.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of low speed reflux wind-tunnel (before small wind speed precision controlling) after the completion of transformation；
Fig. 2 is A-A cross-sectional view in Fig. 1；
Fig. 3 is B-B cross-sectional view in Fig. 1；
Fig. 4 is the structural schematic diagram of low speed reflux wind-tunnel (in small wind speed precision controlling) after the completion of transformation；
In figure, 1-stable section hole wall, 2-air vents, 3-sealing strips, 4-discharge quantity control sleeves, 5-guide rails, 6-
Rack gear, 7-stepper motors, 8-gears, 9-test chambers, 10-wind speed probes, 11-micro-pressure sensors, 12-dampings
Net, 13-honeycombs, 14-computers.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
A kind of low speed reflux small wind speed accuracy control method of wind-tunnel, includes the following steps:
Step 1: being first transformed stable section hole wall 1, processes air vent 2 everywhere on stable section hole wall 1, everywhere
Air vent 2 is evenly distributed on stable section hole wall 1；
Step 2: sealed groove is processed in 1 outer surface of stable section hole wall of 2 two sides of air vent, then in sealed groove
It is embedded in sealing strip 3；
Step 3: discharge quantity control sleeve 4 is sleeved on outside stable section hole wall 1 by one discharge quantity control sleeve 4 of production
Side, is provided with several guide rails 5 between 1 outer surface of 4 inner surface of discharge quantity control sleeve and stable section hole wall, guide rail 5 and steady
Determine 1 outer surface of section hole wall to be fixedly connected, discharge quantity control sleeve 4 can be moved along guide rail 5；
Step 4: one toothed rack 6 is installed in the outer surface of discharge quantity control sleeve 4, guarantees that rack gear 6 is parallel with guide rail 5；
Step 5: it is fixed above rack gear 6 to set up a stepper motor 7, one is installed on the motor shaft of stepper motor 7
Gear 8 guarantees that gear 8 is meshed with rack gear 6, then the control terminal of stepper motor 7 is connected with the computer 14 of wind tunnel system；
Step 6: installing wind speed probe 10 in test chamber 9, and the data connector of wind speed probe 10 is passed through minute-pressure
Gap sensor 11 is connected with computer 8, then installs damping screen 12 and honeycomb 13 in stable section hole wall 1, at this time low speed
The retrofit work of reflux wind-tunnel terminates, and improved effect is as shown in Figures 1 to 3；
Step 7: before wind-tunnel starting, first controlling stepper motor 7 and act, and by 6 engaged transmission of gear 8 and rack gear, makes to deflate
Amount control sleeve 4 is completely covered on the sealing strip 3 of 2 two sides of air vent, and air vent 2 at this time is completely isolated with the external world；
Step 8: starting wind-tunnel acquires the pressure difference signal of actual wind speed in test chamber 9 by wind speed probe 10, then
Pressure difference signal is handled by micro-pressure sensor 11, treated, and pressure difference signal is transmitted directly to computer 14, computer
14 can be compared pressure difference signal with wind speed setting, while issue control instruction from computer 14 to stepper motor 7, and by step
It drives discharge quantity control sleeve 4 mobile into motor 7, air vent 2 is made to be in communication with the outside, and air vent 2 and extraneous connected surface
Product at the uniform velocity increases, while under degassing, actual wind speed will be gradually reduced in test chamber 9, when computer 14 determines wind
When actual wind speed in hole test section 9 has reached wind speed setting, 7 hard stop of stepper motor makes air vent 2 and extraneous company
Logical area is kept constant, as shown in Figure 4.
The small blast velocity control precision that low speed reflux wind-tunnel can be effectively improved in order to better illustrate the present invention, returns low speed
It flows wind-tunnel and carries out practical transformation, the sectional dimension of the stable section hole wall 1 of low speed reflux wind-tunnel is 800mm × 800mm, stable section
The length of hole wall 1 is 1200mm, and the sectional dimension of test chamber 9 is 400mm × 400mm, and the length of test chamber 9 is
800mm, air vent 2 is having a size of 500mm × 200mm；The range of micro-pressure sensor 11 is 25pa, and precision is full scale
0.0005pa。
By taking dust recycling is tested as an example, testing required wind speed setting is 0.8m/s, after starting wind-tunnel, test chamber 9
Interior actual wind speed is 3m/s, and after carrying out air rate adjustment by means of the present invention, smoothly by air rate adjustment to 0.8m/s,
And blast velocity control precision has reached ± 0.15m/s, fully achieves set objective of the invention.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (1)
- The small wind speed accuracy control method of wind-tunnel 1. a kind of low speed flows back, it is characterised in that include the following steps:Step 1: being first transformed stable section hole wall, processes air vent everywhere on the wall of stable section hole, everywhere air vent edge Circumferentially it is evenly arranged on the wall of stable section hole；Step 2: sealed groove is processed in the outer surface stable section Dong Bi of air vent two sides, is then embedded in sealed groove Sealing strip；Step 3: discharge quantity control sleeve is sleeved on the outside of the wall of stable section hole, is deflating by one discharge quantity control sleeve of production Several guide rails, guide rail and the outer surface stable section Dong Bi are provided between amount control sleeve inner surface and the outer surface stable section Dong Bi It is fixedly connected, discharge quantity control sleeve can be moved along guide rail；Step 4: one toothed rack is installed in the outer surface of discharge quantity control sleeve, guarantees that rack gear is parallel with guide rail；Step 5: it is fixed above rack gear to set up a stepper motor, a gear is installed on the motor shaft of stepper motor, is protected Card wheel and rack is meshed, and then the control terminal of stepper motor is connected with the computer of wind tunnel system；Step 6: installing wind speed probe in test chamber, and the data connector of wind speed probe is passed through micro-pressure sensor It is connected with computer, then installs damping screen and honeycomb in the wall of stable section hole, the transformation work of the wind-tunnel of low speed reflux at this time Work terminates；Step 7: before wind-tunnel starting, stepper motor movement is first controlled, by wheel and rack engaged transmission, makes discharge quantity control Sleeve is completely covered on the sealing strip of air vent two sides, and air vent at this time is completely isolated with the external world；Step 8: starting wind-tunnel acquires the pressure difference signal of actual wind speed in test chamber by wind speed probe, then by micro-pressure-difference Sensor handles pressure difference signal, and treated, and pressure difference signal is transmitted directly to computer, and computer can be by pressure difference signal It is compared with wind speed setting, while issuing control instruction from computer to stepper motor, and discharge quantity is driven by stepper motor Control sleeve is mobile, and air vent is made to be in communication with the outside, and air vent at the uniform velocity increases with extraneous connection area, while deflating Under effect, actual wind speed will be gradually reduced in test chamber, when the actual wind speed in computer-made decision test chamber When reaching wind speed setting, stepper motor hard stop keeps constant air vent with extraneous connection area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070757.0A CN109738150B (en) | 2019-01-25 | 2019-01-25 | Low-speed backflow wind tunnel small wind speed precision control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070757.0A CN109738150B (en) | 2019-01-25 | 2019-01-25 | Low-speed backflow wind tunnel small wind speed precision control method |
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| CN109738150A true CN109738150A (en) | 2019-05-10 |
| CN109738150B CN109738150B (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361157A (en) * | 2019-08-26 | 2019-10-22 | 沈阳航空航天大学 | A kind of low speed reflux wind tunnel speed stability control method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619303B2 (en) * | 1989-05-27 | 1994-03-16 | 川崎重工業株式会社 | Wind tunnel wind speed controller |
| JPH09113404A (en) * | 1995-10-17 | 1997-05-02 | Mitsubishi Heavy Ind Ltd | Breeze-velocity control apparatus |
| JPH10123010A (en) * | 1996-10-24 | 1998-05-15 | Mitsubishi Heavy Ind Ltd | Wind velocity controller for wind tunnel |
| CN101034033A (en) * | 2007-01-16 | 2007-09-12 | 中国计量学院 | Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter |
| CN205229186U (en) * | 2015-12-17 | 2016-05-11 | 刘智勇 | Wind speed intelligent control device |
| CN105572422A (en) * | 2014-10-13 | 2016-05-11 | 辽宁省计量科学研究院 | High performance wind speed detection system |
| CN205593725U (en) * | 2016-04-18 | 2016-09-21 | 武汉科技大学 | Test air tunnel |
| CN109115448A (en) * | 2018-09-30 | 2019-01-01 | 天津中德应用技术大学 | A kind of TT&C system suitable for small-sized wind tunnel |
| CN109115449A (en) * | 2018-10-19 | 2019-01-01 | 天津中德应用技术大学 | A kind of intelligent Wind Speed regulator control system suitable for small-sized wind tunnel |
| CN109243263A (en) * | 2018-08-30 | 2019-01-18 | 北京航空航天大学 | A kind of Table top type DC low-speed wind-tunnel of teaching demonstration and experiment |
-
2019
- 2019-01-25 CN CN201910070757.0A patent/CN109738150B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0619303B2 (en) * | 1989-05-27 | 1994-03-16 | 川崎重工業株式会社 | Wind tunnel wind speed controller |
| JPH09113404A (en) * | 1995-10-17 | 1997-05-02 | Mitsubishi Heavy Ind Ltd | Breeze-velocity control apparatus |
| JPH10123010A (en) * | 1996-10-24 | 1998-05-15 | Mitsubishi Heavy Ind Ltd | Wind velocity controller for wind tunnel |
| CN101034033A (en) * | 2007-01-16 | 2007-09-12 | 中国计量学院 | Wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter |
| CN105572422A (en) * | 2014-10-13 | 2016-05-11 | 辽宁省计量科学研究院 | High performance wind speed detection system |
| CN205229186U (en) * | 2015-12-17 | 2016-05-11 | 刘智勇 | Wind speed intelligent control device |
| CN205593725U (en) * | 2016-04-18 | 2016-09-21 | 武汉科技大学 | Test air tunnel |
| CN109243263A (en) * | 2018-08-30 | 2019-01-18 | 北京航空航天大学 | A kind of Table top type DC low-speed wind-tunnel of teaching demonstration and experiment |
| CN109115448A (en) * | 2018-09-30 | 2019-01-01 | 天津中德应用技术大学 | A kind of TT&C system suitable for small-sized wind tunnel |
| CN109115449A (en) * | 2018-10-19 | 2019-01-01 | 天津中德应用技术大学 | A kind of intelligent Wind Speed regulator control system suitable for small-sized wind tunnel |
Non-Patent Citations (1)
| Title |
|---|
| 徐让书等: "低速风洞非定常风特性模型及验证", 《机械设计与制造》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361157A (en) * | 2019-08-26 | 2019-10-22 | 沈阳航空航天大学 | A kind of low speed reflux wind tunnel speed stability control method |
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