CN103365306A - Compressed air flow regulating device and compressed air flow regulating method used for high-speed wind tunnel special test - Google Patents
Compressed air flow regulating device and compressed air flow regulating method used for high-speed wind tunnel special test Download PDFInfo
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Abstract
The invention provides a compressed air flow regulating device and a compressed air flow regulating method used for a high-speed wind tunnel special test, belonging to the technical field of dynamic wind tunnel tests. The device comprises a pneumatic regulating valve, a pressure transmitter, a flow regulating and combining unit, a mass flow meter and a PLC (programmable logic controller). With the adoption of the method, based on the change conditions of air volume, a digital mass flow control strategy is adopted, and a fuzzy control manner is adopted for the changes of the air volume; the flow regulating and combing unit is digitally controlled by utilizing the PLC; the pressure transmitter and the mass flow meter are respectively arranged at the front part and at the rear part of the flow regulating and combining unit, and are used for monitoring and collecting the pressure at an inlet of the flow regulating and combining unit, and actual flow output from the flow regulating and combining unit; the actual flow is compared with theoretical flow to calculate a difference value; and the pneumatic regulating valve and the flow regulating and combining unit are controlled through the PLC, so that the flow finally achieves a needed value, and thereby the condition that the compressed air flow in the wind tunnel special test is accurately controlled is realized.
Description
Technical field
The invention belongs to aerodynamics wind-tunnel technique field, be specifically related to a kind of high-speed wind tunnel extraordinary test compressed air require regulating device and method.This device and method is applicable to, accuracy requirement higher extraordinary pilot project large to the air mass flow scope in the high-speed wind tunnel test.
Background technology
Air-pressure controlling to input in the wind tunnel test requires high, in the high-speed wind tunnel test of routine, usually adopt the pressure of pressure regulator valve control wind-tunnel stable section, the critical component of its control is the pressure regulator valve on the wind-tunnel air inlet pipeline, and the quality of its valve performance and the employing of control strategy are the two large key factors that affect the wind tunnel test quality of data.
At present, in the high-speed wind tunnel conventional test, be annular slot formula pressure regulator valve or pin type variable valve to common employing of the by-pass valve control of input air at home, its control mode generally adopts the control of stable section pressure or spool displacement control dual mode.And for the by-pass valve control of the extraordinary test of high-speed wind tunnel input air mainly take pneumatic control valve or electric control valve as main, its control mode is for to control the pressure behind the valve, the major defect of this control mode: because variable valve self precision is general, it can't reach higher level to flow range and precision, usually pressure precision is up to 1%, thus, can only carry out qualitative analysis to its test figure, and can't accomplish quantitative test.In the extraordinary test of high-speed wind tunnel, the input air flow quantitatively controlled and analysis aspect, domesticly substantially belong to blank, abroad be just to begin the research work over nearly 20 years.
Summary of the invention
The object of the invention is to: for the problem of prior art existence, provide a kind of high-speed wind tunnel extraordinary test compressed air require regulating device and method, changed the extraordinary test of present domestic high-speed wind tunnel and can only adopt the phenomenon of pneumatic control valve or electric control valve, having solved test figure can only qualitative analysis and can't the quantitative test problem.
Goal of the invention of the present invention is achieved through the following technical solutions:
The extraordinary test compressed air require regulating device of a kind of high-speed wind tunnel, be arranged on the wind-tunnel air inlet pipeline, it is characterized in that, this device comprises pneumatic control valve, pressure unit, the flow regulation assembled unit, mass flowmeter and PLC controller, the gas outlet of described pneumatic control valve is connected by the air intake opening of pipeline with the flow regulation assembled unit, described pressure unit is arranged on the pipeline between the air intake opening of the gas outlet of pneumatic control valve and flow regulation assembled unit, described mass flowmeter is arranged on the gas outlet of flow regulation assembled unit, described pressure unit is connected signal output part and all is connected with the PLC controller with mass flowmeter, the output terminal of PLC controller connects respectively pneumatic control valve and flow regulation assembled unit.
Preferably, described flow regulation assembled unit comprises front collection chamber, digital electric magnet valve, normal flow nozzle and rear collection chamber, the gas outlet of described front collection chamber is provided with one, after this gas outlet connects digital solenoid valve, normal flow nozzle successively, be connected with rear collection chamber, described digital electric magnet valve is connected with the PLC controller again.
Preferably, described flow regulation assembled unit comprises that front collection chamber, digital electric magnet valve, jet area are a plurality of normal flow nozzles and the rear collection chamber that 2 Geometric Sequence arranges by common ratio, the gas outlet of described front collection chamber is provided with a plurality of, after each gas outlet connects a digital solenoid valve, normal flow nozzle successively, be connected with rear collection chamber, described digital electric magnet valve is connected with the PLC controller again.
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 the high-pressure type open-close type valve.
Preferably, described mass rate is counted the slot type mass flowmeter, is used for the actual delivery rate that measuring flow is regulated assembled unit.
A kind of as claimed in claim 1 control method of device is characterized in that, the method comprises:
(1) input air pressure given value and the delivery air flow set-point of setting flow regulation assembled unit;
(2) the PLC controller receives the actual input air force value that pressure unit gathers in real time, and compare with input air pressure given value, obtain deviate, then send instruction according to this deviate and carry out FEEDBACK CONTROL to pneumatic control valve, eliminate deviate;
(3) the actual delivery air flow value of the real-time quality of reception flowmeter collection of PLC controller, and compare with delivery air flow set-point, obtain deviate, then send instruction according to this deviate and carry out FEEDBACK CONTROL to the flow regulation assembled unit, eliminate deviate.
Preferably, the delivery air flow set-point in the step (1) is according to formula
Calculate; In the formula
Be delivery air flow set-point, units/kg; P
0Be input air pressure given value, units MPa; T
0Be medium temperature, unit K, A is the circulation area of normal flow nozzle, the mm of unit.
Compared with prior art, the present invention is by setting up two to regulate backfeed loop, and the geometric ratio of normal flow nozzle is arranged, accurate quantification to the air mass flow data can reach per mille, even ten thousand/, thereby can realize that the wind tunnel test data can only carry out qualitative analysis, and the problem that can't accomplish quantitative test has remedied domestic, international blank in this regard.
Description of drawings
Fig. 1 is the structural representation of apparatus of the present invention;
Fig. 2 is the structural representation of flow regulation assembled unit among Fig. 1.
Description of reference numerals:
The 1st, pneumatic control valve, the 2nd, pressure unit, the 3rd, flow regulation assembled unit, the 4th, mass flowmeter, the 5th, PLC controller, the 6th, front collection chamber, the 7th, digital electric magnet valve, the 8th, normal flow nozzle, the 9th, rear collection chamber.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
As shown in Figure 1 and Figure 2, the compressed air require regulating device is used in the extraordinary test of a kind of high-speed wind tunnel, is mainly used in being arranged on and carries out the flow control adjusting on the wind-tunnel air inlet pipeline, also can be used on other equipment that need to carry out the quantitative test adjusting.The device of this programme comprises: pneumatic control valve 1, pneumatic control valve adopts the pneumatic control mode to control flow regulation assembled unit 3 front compressed-air actuated pressure, the pneumatic control reaction is fast, highly sensitive, is convenient to the front compressed-air actuated pressure of fast and stable flow regulation combination; Pressure unit 2; Flow regulation assembled unit 3; Mass flowmeter 4, mass flowmeter are a kind of slot type mass flowmeters, are used for the actual delivery rate that measuring flow is regulated assembled unit; PLC controller 5, the PLC controller receives the actual pressure output valve of pressure unit collection and the flow real output value that mass flowmeter gathers, then by the numerical value of the built-in data processing software analysis collection of PLC and the deviate of theoretical numerical value (set-point), then controller sends instructions to pneumatic control valve and flow regulation assembled unit, make pneumatic control valve and flow regulation assembled unit regulate control, its essence is the feedback regulation mode.The gas outlet of pneumatic control valve 1 is connected by the air intake opening of pipeline with flow regulation assembled unit 3.Pressure unit is arranged on the pipeline between the air intake opening of the gas outlet of pneumatic control valve and flow regulation assembled unit, is mainly used in the actual air pressure of Gather and input flow regulation assembled unit.Mass flowmeter 4 is arranged on the gas outlet of flow regulation assembled unit 3, is used for the actual delivery rate that measuring flow is regulated assembled unit.The signal output part that pressure unit 2 is connected with mass flowmeter all is connected with PLC controller 5.The output terminal of PLC controller 5 connects respectively pneumatic control valve 1 and flow regulation assembled unit 3, respectively both is carried out FEEDBACK CONTROL.
Flow regulation assembled unit 3 comprises front collection chamber 6, digital electric magnet valve 7, normal flow nozzle 8 and rear collection chamber 9.Difference according to control accuracy, the digital electric magnet valve 7 of required setting, the number of normal flow nozzle 8 are also different, in the time only need to carrying out just slightly precision adjusting, the gas outlet of front collection chamber 6 is provided with one, after this gas outlet connects digital solenoid valve 7, normal flow nozzle 8 successively, be connected with rear collection chamber 9, the digital electric magnet valve is connected with the PLC controller again.When needs carry out high precision when control, flow regulation assembled unit 3 comprises that front collection chamber 6, digital electric magnet valve 7, jet area are a plurality of normal flow nozzles 8 and the rear collection chamber 9 that 2 Geometric Sequence arranges by common ratio.The gas outlet of front collection chamber 6 is provided with a plurality of, and each gas outlet is connected with rear collection chamber 9 after connecting successively a digital solenoid valve 7, normal flow nozzle 8 again, and each digital electric magnet valve 7 is connected with PLC controller 5.The digital electric magnet valve is a kind of high-pressure type open-close type valve, and it is highly sensitive, and the response time is about 50ms.The flow regulation assembled unit can form the multi-path form because digital electric magnet valve on off state is different in process of the test, for example the gas outlet of current collection chamber is provided with 10; Digital electric magnet valve 7 also arranges 10; Normal flow nozzle 8 also arranges 10, the jet area of each normal flow nozzle 8 is 2 Geometric Sequence setting by common ratio, and first jet area is 1, and then second jet area is 2, the 3rd jet area is that 4, the four jet areas are that the tenth jet area of 8..... is 2
9=512, open so as required the path that the different digital solenoid valve can realize and can reach 1024 kinds of flow combination, can satisfy extraordinary test to the different flow demand.If the number of digital electric magnet valve 7 and normal flow nozzle 8 increases, then attainable Access flow number of combinations also increases, and degree of regulation also increases; If the number of digital electric magnet valve 7 and normal flow nozzle 8 reduces, then attainable Access flow number of combinations also reduces, and degree of regulation also reduces.
Use the control method of aforementioned means to be mainly: for the difference of pressurized air pressure in the different-diameter circulation duct, to set up the relation between known input air pressure and the delivery air mass rate; Consider the situation of change that air gas is long-pending, taked the strategy of digital control mass rate, the mode of fuzzy control has been taked in long-pending variation to absolutely empty gas; Utilize the PLC controller that the flow regulation assembled unit is carried out digital control, before and after the flow regulation assembled unit, be provided with respectively first pressure unit and mass flowmeter, be used for monitoring and gathering the pressure of flow regulation assembled unit entrance and the actual flow of output, and compare with theoretical delivery and to ask difference, regulate combination by PLC controller adjust flux and make flow finally reach desirable value, finally realized in the extraordinary test of wind-tunnel the accurate control to compressed air require.Its concrete steps are as follows:
(1) for the difference of pressurized air pressure in the different-diameter circulation duct, set up first the relation between known input air pressure and the delivery air mass rate, then set the input air pressure given value of flow regulation assembled unit, then according to the demand of special type test to the delivery air mass rate, utilize the relation formula of setting up
Calculate delivery air flow set-point; In the formula
Be delivery air flow set-point, units/kg; P
0Be input air pressure given value, units MPa; T
0Be medium temperature, unit K, A is the circulation area of normal flow nozzle, the mm of unit.
(2) the flow regulation assembled unit is placed a kind of block position at this theoretical delivery (set-point) place with the PLC controller, be about to the flow regulation combination 1.-10. in the passage corresponding solenoid valve open, remaining solenoid valve is in closed condition; The PLC controller receives the actual input air force value that pressure unit gathers in real time, and compares with input air pressure given value, obtains deviate, then sends instruction according to this deviate and carries out FEEDBACK CONTROL to pneumatic control valve, eliminates deviate;
(3) the actual delivery air flow value of the real-time quality of reception flowmeter collection of PLC controller, and compare with delivery air flow set-point, obtain deviate, then send instruction according to this deviate and carry out FEEDBACK CONTROL to the flow regulation assembled unit, eliminate deviate, for example working as delivery air flow set-point is 60, open 3. 4. 5. 6. number solenoid valve this moment, each solenoid valve is by flow addition 4+8+16+32=60, (this is the numeral of arbitrarily lifting, satisfying the geometric ratio relation gets final product, be mainly used in explanation and realize principle), but actual detected flow is 80, then need to adjust the control solenoid valve this moment and 5. 7. open, each solenoid valve has so just been realized the flow fine adjustment by flow addition 16+64=80, and know accurately input air flow, thereby solved in the extraordinary test of high-speed wind tunnel the input air flow quantitatively controlled and analysis aspect problem.
The above only is preferred embodiment of the present invention, not in order to limit the present invention, should be pointed out that all any modifications of doing within the spirit and principles in the present invention, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. extraordinary test of high-speed wind tunnel used the compressed air require regulating device, be arranged on the wind-tunnel air inlet pipeline, it is characterized in that, this device comprises pneumatic control valve, pressure unit, the flow regulation assembled unit, mass flowmeter and PLC controller, the gas outlet of described pneumatic control valve is connected by the air intake opening of pipeline with the flow regulation assembled unit, described pressure unit is arranged on the pipeline between the air intake opening of the gas outlet of pneumatic control valve and flow regulation assembled unit, described mass flowmeter is arranged on the gas outlet of flow regulation assembled unit, described pressure unit is connected signal output part and all is connected with the PLC controller with mass flowmeter, the output terminal of PLC controller connects respectively pneumatic control valve and flow regulation assembled unit.
2. extraordinary test of a kind of high-speed wind tunnel according to claim 1 used the compressed air require regulating device, it is characterized in that, described flow regulation assembled unit comprises front collection chamber, digital electric magnet valve, normal flow nozzle and rear collection chamber, the gas outlet of described front collection chamber is provided with one, after this gas outlet connects digital solenoid valve, normal flow nozzle successively, be connected with rear collection chamber, described digital electric magnet valve is connected with the PLC controller again.
3. extraordinary test of a kind of high-speed wind tunnel according to claim 1 used the compressed air require regulating device, it is characterized in that, described flow regulation assembled unit comprises that front collection chamber, digital electric magnet valve, jet area are a plurality of normal flow nozzles and the rear collection chamber that 2 Geometric Sequence arranges by common ratio, the gas outlet of described front collection chamber is provided with a plurality of, after each gas outlet connects a digital solenoid valve, normal flow nozzle successively, be connected with rear collection chamber, described digital electric magnet valve is connected with the PLC controller again.
4. the compressed air require regulating device is used in the extraordinary test of a kind of high-speed wind tunnel according to claim 3, it is characterized in that, the gas outlet of described front collection chamber is provided with 2～20.
5. the compressed air require regulating device is used in the extraordinary test of a kind of high-speed wind tunnel according to claim 4, it is characterized in that, the gas outlet of described front collection chamber is provided with 10.
According to claim 2 or the extraordinary test of 3 described a kind of high-speed wind tunnels use the compressed air require regulating device, it is characterized in that, described digital electric magnet valve is the high-pressure type open-close type valve.
7. the compressed air require regulating device is used in the extraordinary test of a kind of high-speed wind tunnel according to claim 1, it is characterized in that, described mass rate is counted the slot type mass flowmeter, is used for the actual delivery rate that measuring flow is regulated assembled unit.
8. a control method that installs as claimed in claim 1 is characterized in that, the method comprises:
(1) input air pressure given value and the delivery air flow set-point of setting flow regulation assembled unit;
(2) the PLC controller receives the actual input air force value that pressure unit gathers in real time, and compare with input air pressure given value, obtain deviate, then send instruction according to this deviate and carry out FEEDBACK CONTROL to pneumatic control valve, eliminate deviate;
(3) the actual delivery air flow value of the real-time quality of reception flowmeter collection of PLC controller, and compare with delivery air flow set-point, obtain deviate, then send instruction according to this deviate and carry out FEEDBACK CONTROL to the flow regulation assembled unit, eliminate deviate.
9. the compressed air require control method is used in the extraordinary test of a kind of high-speed wind tunnel according to claim 8, it is characterized in that, the delivery air flow set-point in the step (1) is according to formula
Calculate; In the formula
Be delivery air flow set-point, units/kg; P
0Be input air pressure given value, units MPa; T
0Be medium temperature, unit K, A is the circulation area of normal flow nozzle, the mm of unit.
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