CN103365306B - A kind of high-speed wind tunnel special test compressed air require adjusting means and method - Google Patents
A kind of high-speed wind tunnel special test compressed air require adjusting means and method Download PDFInfo
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Abstract
The present invention provides a kind of high-speed wind tunnel special test compressed air require adjusting means and method, belong to aerodynamic wind-tunnel technique field, this device includes pneumatic control valve, pressure transmitter, Flow-rate adjustment assembled unit, mass flowmenter and PLC, the method situation of change based on volume of air, take the strategy of digital control mass flow, the change of volume of air is taken the mode of fuzzy control；Utilize PLC that Flow-rate adjustment assembled unit is carried out digital control, first before and after Flow-rate adjustment assembled unit, it is respectively provided with pressure transmitter and mass flowmenter, it is used for monitoring and gather the pressure of Flow-rate adjustment assembled unit entrance and the actual flow of output, and carry out contrast with theoretical delivery and seek difference, control pneumatic control valve by PLC and Flow-rate adjustment assembled unit makes flow be finally reached desirable value, it achieve the accurate control to compressed air require in wind-tunnel special test.
Description
Technical field
The invention belongs to aerodynamic wind-tunnel technique field, be specifically related to a kind of high-speed wind tunnel special test
By compressed air require adjusting means and method.This device and method be applicable to high wind tunnel testing to air mass flow
The special test project that scope is relatively big, required precision is higher.
Background technology
In wind tunnel test, the air-pressure controlling to input requires high, generally adopts in conventional high wind tunnel testing
Control the pressure of wind-tunnel stable section with pressure regulator valve, its critical component controlled is the pressure regulator valve on wind-tunnel air inlet pipeline,
The quality of its valve performance and the employing of control strategy are the two big key factors affecting the wind tunnel test quality of data.
At present, at home in high-speed wind tunnel routine test, generally using the control valve of input air is ring-type seam
Gap type pressure regulator valve or pin type regulation valve, its control mode typically uses stable section Stress control or spool displacement to control two
The mode of kind.And for the control valve of high-speed wind tunnel special test input air mainly with pneumatic control valve or electric adjustable
Joint valve is main, and its control mode is to be controlled the pressure after valve, the major defect of this control mode: owing to adjusting
Joint valve self precision is general, and it is unable to reach higher level to range of flow and precision, and usual pressure precision is the highest
Reach 1%, thus, its test data can only be carried out qualitative analysis, and quantitative analysis cannot be accomplished.At a high speed
Input air flow is carried out fixing quantity and analysis aspect, the domestic blank that substantially belongs to, state by wind-tunnel special test
It is outward over nearly 20 years, just to start the research work.
Summary of the invention
It is an object of the invention to: the problem existed for prior art, it is provided that a kind of high-speed wind tunnel special test
By compressed air require adjusting means and method, change current domestic high-speed wind tunnel special test and can only use pneumatic
Regulation valve or the phenomenon of electric control valve, solve test data can only qualitative analysis and cannot quantitative analysis problem.
The goal of the invention of the present invention is achieved through the following technical solutions:
A kind of high-speed wind tunnel special test compressed air require adjusting means, is arranged on wind-tunnel air inlet pipeline, its
Being characterised by, this device includes pneumatic control valve, pressure transmitter, Flow-rate adjustment assembled unit, mass flowmenter
And PLC, the gas outlet of described pneumatic control valve is by the air inlet of pipeline with Flow-rate adjustment assembled unit
Connect, described pressure transmitter be arranged on the gas outlet of pneumatic control valve and Flow-rate adjustment assembled unit air inlet it
Between pipeline on, described mass flowmenter is arranged on the gas outlet of Flow-rate adjustment assembled unit, described pressure inverting
The signal output part of device and mass flowmenter is all connected with PLC, and the outfan of PLC connects respectively
Connect pneumatic control valve and Flow-rate adjustment assembled unit.
Preferably, described Flow-rate adjustment assembled unit includes that front collection chamber, digital electric magnet valve, normal flow spray
Mouth and rear collection chamber, the gas outlet of described front collection chamber is provided with one, this gas outlet be sequentially connected with digital electric magnet valve,
After normal flow nozzle, then being connected with rear collection chamber, described digital electric magnet valve is connected with PLC.
Preferably, described Flow-rate adjustment assembled unit include front collection chamber, digital electric magnet valve, nozzle area by
Common ratio is multiple normal flow nozzles and rear collection chamber, the gas outlet of described front collection chamber of the Geometric Sequence setting of 2
Be provided with multiple, after each gas outlet is sequentially connected with a digital electromagnetic valve, a normal flow nozzle, then with rear collection
Air chamber connects, and described digital electric magnet valve is connected with PLC.
Preferably, the gas outlet of described front collection chamber is provided with 2～20.
Preferably, the gas outlet of described front collection chamber is provided with 10.
Preferably, described digital electric magnet valve is high-pressure type open-close type valve.
Preferably, described mass flow is calculated as slot type mass flowmenter, for measuring Flow-rate adjustment assembled unit
Actual output flow.
The control method of a kind of device as claimed in claim 1, it is characterised in that the method includes:
(1) input air pressure set-point and the delivery air flow set-point of Flow-rate adjustment assembled unit are set；
(2) collection of PLC real-time reception pressure transmitter actually enter air pressure value, and with input
Air pressure set-point compares, and obtains deviation value, then issues instructions to pneumatic control valve according to this deviation value
Carry out feedback control, eliminate deviation value；
(3) PLC real-time reception mass flowmenter gather actual delivery air flow value, and with output
Air mass flow set-point compares, and obtains deviation value, then issues instructions to Flow-rate adjustment group according to this deviation value
Close unit and carry out feedback control, eliminate deviation value.
Preferably, the delivery air flow set-point in step (1) is according to formulaMeter
Draw；In formulaFor delivery air flow set-point, units/kg；P0For input air pressure set-point,
Units MPa；T0For medium temperature, unit K, A is the circulation area of normal flow nozzle, unit mm.
Compared with prior art, the present invention is by setting up two regulation feedback circuits, and normal flow nozzle
Geometric ratio is arranged, to the accurate quantification of air flow data up to one thousandth, even ten thousand/, it is thus possible to realize
Wind tunnel test data can only carry out qualitative analysis, and cannot accomplish the problem of quantitative analysis, compensate for domestic, international
Blank in this regard.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention；
Fig. 2 is the structural representation of Flow-rate adjustment assembled unit in Fig. 1.
Description of reference numerals:
1 be pneumatic control valve, 2 be pressure transmitter, 3 be Flow-rate adjustment assembled unit, 4 be mass flowmenter,
5 be PLC, 6 be front collection chamber, 7 be digital electric magnet valve, 8 be normal flow nozzle, 9 be after
Collection chamber.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As shown in Figure 1 and Figure 2, a kind of high-speed wind tunnel special test compressed air require adjusting means, mainly use
Flow-control regulation is carried out it can also be used to other need to carry out quantitative analysis regulation in being arranged on wind-tunnel air inlet pipeline
Equipment on.The device of this programme includes: pneumatic control valve 1, and pneumatic control valve uses pneumatic control mode to control
Compressed-air actuated pressure before Flow-rate adjustment assembled unit 3 processed, pneumatic control reaction is fast, highly sensitive, it is simple to quickly
Compressed-air actuated pressure before regime flow regulation combination；Pressure transmitter 2；Flow-rate adjustment assembled unit 3；Quality
Effusion meter 4, mass flowmenter is a kind of slot type mass flowmenter, for measuring the reality of Flow-rate adjustment assembled unit
Output flow；PLC 5, PLC receives actual pressure output valve and the matter that pressure transmitter gathers
The flow real output value that amount effusion meter gathers, then processes, by PLC onboard data, the number that software analysis gathers
Value and the deviation value of theoretical values (set-point), then controller is to pneumatic control valve and Flow-rate adjustment assembled unit
Sending instructions, make pneumatic control valve and Flow-rate adjustment assembled unit be adjusted controlling, it is substantially feedback regulation mode.
The gas outlet of pneumatic control valve 1 is connected with the air inlet of Flow-rate adjustment assembled unit 3 by pipeline.Pressure transmitter
It is arranged on the pipeline between the gas outlet of pneumatic control valve and the air inlet of Flow-rate adjustment assembled unit, is mainly used in
The actual air pressure of Gather and input Flow-rate adjustment assembled unit.It is single that mass flowmenter 4 is arranged on Flow-rate adjustment combination
On the gas outlet of unit 3, for measuring the actual output flow of Flow-rate adjustment assembled unit.Pressure transmitter 2 and matter
The signal output part of amount effusion meter 4 is all connected with PLC 5.The outfan of PLC 5 connects respectively
Connect pneumatic control valve 1 and Flow-rate adjustment assembled unit 3, respectively both are carried out feedback control.
Flow-rate adjustment assembled unit 3 include front collection chamber 6, digital electric magnet valve 7, normal flow nozzle 8 and after
Collection chamber 9.According to the difference of control accuracy, the digital electric magnet valve 7 of required setting, normal flow nozzle 8
Number the most different, when having only to carry out the most slightly precision regulation, the gas outlet of front collection chamber 6 is provided with one, should
After gas outlet is sequentially connected with digital electric magnet valve 7, normal flow nozzle 8, then it is connected with rear collection chamber 9, numeral
Formula electromagnetic valve is connected with PLC.When needs carry out controlling in high precision, Flow-rate adjustment assembled unit 3 wraps
Include front collection chamber 6, digital electric magnet valve 7, nozzle area by multiple standards of the Geometric Sequence setting that common ratio is 2
Flow nozzle 8 and rear collection chamber 9.The gas outlet of front collection chamber 6 is provided with multiple, and each gas outlet is sequentially connected with one
After 7, normal flow nozzle 8 of digital electric magnet valve, then it is connected with rear collection chamber 9, each digital electric magnet valve
7 are connected with PLC 5.Digital electric magnet valve is a kind of high-pressure type open-close type valve, and it is highly sensitive,
Response time is at about 50ms.Flow-rate adjustment assembled unit in process of the test due to digital electromagnetic valve switch shape
State different and can be to form multi-path form, such as currently the gas outlet of collection chamber is provided with 10；Digital electromagnetism
Valve 7 is also provided with 10；Normal flow nozzle 8 is also provided with 10, and the nozzle area of each normal flow nozzle 8 is pressed
Common ratio is the Geometric Sequence setting of 2, and first nozzle area is 1, then second nozzle area is 2, the 3rd
Nozzle area is 4, the 4th nozzle area be the tenth nozzle area of 8..... be 29=512, the most as required
The path that unlatching different digital electromagnetic valve is capable of can reach 1024 kinds of flow combination, can meet extraordinary examination
Test different flow demand.If the number of digital electric magnet valve 7 and normal flow nozzle 8 increases, then can realize
Access flow number of combinations also increase, degree of regulation also increases；If digital electric magnet valve 7 and normal flow nozzle
The number of 8 reduces, and the most attainable Access flow number of combinations also reduces, and degree of regulation also reduces.
Use the control method of aforementioned means predominantly: for compressed air pressure in different-diameter circulation duct
Difference, establishes the relation between known input air pressure and delivery air mass flow；In view of air QI-mass
Situation of change, take the strategy of digital control mass flow, the change to absolutely empty QI-mass takes Fuzzy Control
The mode of system；Utilize PLC that Flow-rate adjustment assembled unit carries out digital control, first in Flow-rate adjustment
It is respectively provided with pressure transmitter and mass flowmenter before and after assembled unit, is used for monitoring and gather Flow-rate adjustment combination
The pressure of unit entrance and the actual flow of output, and carry out contrast with theoretical delivery and seek difference, controlled by PLC
Device processed regulation Flow-rate adjustment combination makes flow be finally reached desirable value, finally achieves in wind-tunnel special test compression
The accurate control of air mass flow.It specifically comprises the following steps that
(1) for compressed air difference of pressure in different-diameter circulation duct, known input sky is first established
Relation between atmospheric pressure and delivery air mass flow, then sets the input air pressure of Flow-rate adjustment assembled unit
Power set-point, then according to the special test demand to delivery air mass flow, utilizes the relation formula set upCalculate delivery air flow set-point；In formulaGive for delivery air flow
Value, units/kg；P0For input air pressure set-point, units MPa；T0For medium temperature, unit K, A
For the circulation area of normal flow nozzle, unit mm.
(2) by PLC, Flow-rate adjustment assembled unit is placed in the one of this theoretical delivery (set-point) place
Kind of block position, will Flow-rate adjustment combine 1.-10. corresponding electromagnetic valve is opened, at remaining electromagnetic valve in passage
In closed mode；PLC real-time reception pressure transmitter collection actually enter air pressure value, and with
Input air pressure set-point compares, and obtains deviation value, then issues instructions to pneumatic control according to this deviation value
Valve processed carries out feedback control, eliminates deviation value；
(3) PLC real-time reception mass flowmenter gather actual delivery air flow value, and with output
Air mass flow set-point compares, and obtains deviation value, then issues instructions to Flow-rate adjustment group according to this deviation value
Close unit and carry out feedback control, eliminate deviation value, such as, be 60 when delivery air flow set-point, now open 3.
The most 6. number electromagnetic valve, each electromagnetic valve is added 4+8+16+32=60 by flow, and (this is the numeral arbitrarily lifted, full
Foot geometric ratio relation, be mainly used in explanation and realize principle), but actually detected go out flow be 80, the most then need
Adjusting control electromagnetic valve the most 7. to open, each electromagnetic valve is added 16+64=80 by flow, the most just achieves stream
Amount accurately regulation, and will also realize that and accurately enter air mass flow, thus solve at high-speed wind tunnel special test
In input air flow carried out the problem in terms of fixing quantity and analysis.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, it is noted that
All any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included in this
Within the protection domain of invention.
Claims (7)
1. a high-speed wind tunnel special test compressed air require adjusting means, is arranged on wind-tunnel air inlet pipeline, its
Be characterised by, this device include pneumatic control valve, pressure transmitter, Flow-rate adjustment assembled unit, mass flowmenter and
PLC, the gas outlet of described pneumatic control valve is connected with the air inlet of Flow-rate adjustment assembled unit by pipeline,
Described pressure transmitter is arranged on the pipeline between the gas outlet of pneumatic control valve and the air inlet of Flow-rate adjustment assembled unit
On, described mass flowmenter is arranged on the gas outlet of Flow-rate adjustment assembled unit, described pressure transmitter and quality stream
The signal output part of gauge is all connected with PLC, the outfan of PLC connect respectively pneumatic control valve and
Flow-rate adjustment assembled unit, described Flow-rate adjustment assembled unit includes front collection chamber, digital electric magnet valve, nozzle face
The long-pending multiple normal flow nozzles arranged by the Geometric Sequence that common ratio is 2 and rear collection chamber, giving vent to anger of described front collection chamber
Mouth be provided with multiple, after each gas outlet is sequentially connected with a digital electromagnetic valve, a normal flow nozzle, then with rear collection
Air chamber connects, and described digital electric magnet valve is connected with PLC.
A kind of high-speed wind tunnel special test compressed air require adjusting means the most according to claim 1, it is special
Levying and be, the gas outlet of described front collection chamber is provided with 2～20.
A kind of high-speed wind tunnel special test compressed air require adjusting means the most according to claim 2, it is special
Levying and be, the gas outlet of described front collection chamber is provided with 10.
A kind of high-speed wind tunnel special test compressed air require adjusting means the most according to claim 1, it is special
Levying and be, described digital electric magnet valve is high-pressure type open-close type valve.
A kind of high-speed wind tunnel special test compressed air require adjusting means the most according to claim 1, it is special
Levying and be, described mass flow is calculated as slot type mass flowmenter, defeated for measuring the reality of Flow-rate adjustment assembled unit
Outflow.
6. the control method of a device as claimed in claim 1, it is characterised in that the method includes:
(1) input air pressure set-point and the delivery air flow set-point of Flow-rate adjustment assembled unit are set；
(2) collection of PLC real-time reception pressure transmitter actually enter air pressure value, and and input air
Pressure set-point compares, and obtains deviation value, then issues instructions to pneumatic control valve according to this deviation value and carry out instead
Feedback controls, and eliminates deviation value；
(3) the actual delivery air flow value that PLC real-time reception mass flowmenter gathers, and and delivery air
Flow set-point compares, and obtains deviation value, then issues instructions to Flow-rate adjustment assembled unit according to this deviation value
Carry out feedback control, eliminate deviation value.
Control method the most according to claim 6, it is characterised in that the delivery air flow in step (1)
Set-point is according to formulaCalculate；In formulaFor delivery air flow set-point, list
Position kg；P0For input air pressure set-point, units MPa；T0For medium temperature, unit K, A is normal flow
The circulation area of nozzle, unit mm2。
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