CN110987358A - Quick-response pressure-sensitive paint dynamic calibration device - Google Patents
Quick-response pressure-sensitive paint dynamic calibration device Download PDFInfo
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- CN110987358A CN110987358A CN201911353099.2A CN201911353099A CN110987358A CN 110987358 A CN110987358 A CN 110987358A CN 201911353099 A CN201911353099 A CN 201911353099A CN 110987358 A CN110987358 A CN 110987358A
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- 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
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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Abstract
The invention discloses a dynamic calibration device for a quick-response pressure-sensitive paint, which relates to the technical field of aerospace experiments and has the technical scheme that: the device comprises a shock tube consisting of a high-pressure chamber and a low-pressure chamber with the end part being made of optical glass, a film clamping mechanism, high-pressure air source equipment, a pressure measurement control system, a pressure-sensitive paint test sample wafer, a photomultiplier, an ultraviolet LED light source, an optical filter, a first vacuum pump, a second vacuum pump, a temperature sensor, a speed measurement sensor, a pressure sensor, an oscilloscope, a data acquisition and analysis system and output equipment; the pressure measurement control system is composed of a plurality of pressure transmitters; the pressure measurement control system, the temperature measurement system and the speed measurement system are connected with the data acquisition and analysis system. The PSP pressure measurement can be carried out in the known unsteady frequency step change flow field, and the response time of the used coating is determined by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive coating changing along with the step pressure, so that the dynamic calibration of the quick-response pressure-sensitive paint is realized.
Description
Technical Field
The invention relates to the technical field of aerospace experiments, in particular to a dynamic calibration device for a quick-response pressure-sensitive paint.
Background
In wind tunnel and aircraft experiments, quantitative measurement of surface pressure is an important method for understanding the aerodynamic properties of an aircraft. For the design of an aircraft, surface pressure measurement is an indispensable content, and is very important for understanding the characteristics of a flow field and analyzing the aerodynamic characteristics of the aircraft and components, and is an important basis for the design of the aircraft. Pressure distribution measurements provide key information on many important flow phenomena, such as shock shape, location, and flow separation. In addition, accurate pressure data plays a key role in validating and validating turbulence model reliability, computational fluid dynamics programs, and computational results.
Pressure Sensitive Paint (PSP) technology is a non-contact measurement method to obtain Pressure distribution. The PSP technology utilizes the phenomenon that the fluorescence intensity of luminous coating molecules changes along with pressure under the irradiation of exciting light with specific wavelength, converts the pressure into light intensity information, then carries out image processing, calculates the pressure distribution on the surface of the model, and has the advantages of high spatial resolution, no limitation of the model structure, no damage to the flow field on the surface of the model, capability of realizing large-area pressure distribution measurement and the like.
At present, the application of the PSP technology covers a plurality of fields such as aerospace craft surface pressure distribution measurement, helicopter rotor surface pressure distribution measurement, aero-engine fan/compressor blade component surface pressure distribution measurement, complex flow mechanism research and the like. In a series of tasks such as aerodynamic research and model development in the fields of foreign aviation and aerospace, the PSP technology plays an extremely important key technical support role. The fast response PSP technology also plays an extremely important role in the measurement of unsteady pressure of a model with complex aerodynamic characteristics, such as the measurement of the surface pressure distribution of a helicopter rotor wing and the measurement of the surface pressure distribution of the model in unsteady complex flow such as turbulence.
Due to the advantages and disadvantages of different types of porous PSP coatings and the fact that certain randomness exists in the geometrical shape of the porous structure and the spraying thickness distribution of the porous structure, the response time is slightly different, and it is necessary to accurately obtain the response time of the pressure-sensitive coating before dynamic measurement. Therefore, before the test measurement, the type of the pressure-sensitive paint is selected according to the frequency of the flow field pressure change, and the measurement of the response time of the pressure-sensitive paint, namely the dynamic calibration of the pressure-sensitive paint, is carried out before the measurement.
Disclosure of Invention
The invention aims to provide a quick-response dynamic calibration device for pressure-sensitive paint, which can measure the pressure of PSP in a known unsteady-frequency step change flow field and determine the response time of the used paint by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive paint changing along with the step pressure, thereby realizing the dynamic calibration of the quick-response pressure-sensitive paint.
The technical purpose of the invention is realized by the following technical scheme: a quick-response pressure-sensitive paint dynamic calibration device comprises a dynamic calibration system, wherein the dynamic calibration system consists of a shock tube, high-pressure air source equipment connected with the shock tube, a pressure measurement control system, a pressure-sensitive paint test sample wafer, a photomultiplier close to the pressure-sensitive paint test sample wafer, an ultraviolet LED light source, an optical filter and a data acquisition and analysis system; the data acquisition and analysis system is connected with an output device;
the shock tube comprises a high-pressure chamber and a low-pressure chamber; the shock tube is provided with a film clamping mechanism, and the film clamping mechanism is positioned between the high-pressure chamber and the low-pressure chamber; the side walls of the high-pressure chamber and the low-pressure chamber are respectively connected with a first vacuum pump and a second vacuum pump through a first pipeline and a second pipeline; the side wall of the end part of the low-pressure chamber, which is far away from the high-pressure chamber, is made of optical glass, the pressure-sensitive paint test sample sheet is positioned at the end part of the low-pressure chamber, which is far away from the high-pressure chamber, and the pressure-sensitive paint test sample sheet is positioned in the optical glass; the ultraviolet LED light source is close to the pressure-sensitive paint test sample wafer;
the outer wall of the low-pressure chamber is provided with a temperature measuring system consisting of a temperature sensor;
a speed measuring system consisting of a speed measuring sensor is arranged on the inner wall of the low-pressure chamber;
the inner wall of the low-pressure chamber is provided with a pressure sensor, the pressure sensor is connected with an oscilloscope, the oscilloscope is connected with a photomultiplier close to a pressure-sensitive paint test sample wafer, and the optical filter is arranged at a signal acquisition end of the photomultiplier;
the pressure measurement control system comprises a first pressure transmitter arranged in the high-pressure chamber, a second pressure transmitter arranged in the low-pressure chamber, a third pressure transmitter arranged in the first pipeline and a fourth pressure transmitter arranged in the second pipeline; the second pressure transmitter is connected with a low-pressure section pressure measuring valve;
and the pressure measurement control system, the temperature measurement system and the speed measurement system are all connected with the data acquisition and analysis system.
By adopting the technical scheme, the shock tube is convenient for generating pressure step change in the shock tube so as to test the dynamic response characteristic of the quick-response pressure-sensitive paint; before a dynamic calibration test is carried out on the quick response pressure-sensitive paint, any flow generated in the shock tube can be prevented through a film clamping mechanism in the shock tube; then, a high-pressure air source device connected with the shock tube can be used for providing a high-pressure air source for the shock tube; in the process of supplying gas to the high-pressure chamber of the shock tube through the high-pressure gas source equipment, the pressure in the high-pressure chamber of the shock tube rises gradually, and the diaphragm of the diaphragm clamping mechanism deforms gradually under the pressure until the diaphragm is broken; after the diaphragm of the film clamping mechanism is broken, the gas in the high-pressure chamber pushes the gas in the low-pressure chamber to move forward, and the front of the moving gas forms a clean discontinuity, namely shock wave; when the shock wave reaches the surface of the pressure-sensitive paint test sample piece coated with the quick-response pressure-sensitive paint, a transient continuous pressure step can be applied to the surface of the pressure-sensitive paint test sample piece, the climbing time of the pressure step is much faster than the following time of the quick-response pressure-sensitive paint, and the dynamic characteristic of the quick-response pressure-sensitive paint can be calibrated; the first pressure transmitter and the second pressure transmitter can convert the pressures of the high pressure chamber and the low pressure chamber into pneumatic signals or electric signals respectively and transmit the pneumatic signals or the electric signals to a data acquisition and analysis system for analysis and processing, so that the pressures in the high pressure chamber and the low pressure chamber can be controlled conveniently; the pressure in the low-pressure chamber can be conveniently measured and adjusted through the low-pressure section pressure measuring valve; the pressure sensor can sense dynamic pressure change signals in the low-pressure chamber of the shock tube, convert the pressure change signals into electric signals and transmit the electric signals to the oscilloscope for processing, and meanwhile, the pressure change signals in the low-pressure chamber sensed by the pressure sensor can provide trigger signals for quick response pressure sensitive paint measurement; the temperature sensor can measure the indoor temperature value information of the low pressure and transmit the information to the data acquisition and analysis system for analysis and storage; the flow speed information of the gas in the low-pressure chamber can be measured through the speed measuring sensor, and the flow speed information of the gas is transmitted to the data acquisition and analysis system for analysis and storage; the first vacuum pump and the second vacuum pump are used for conveniently pumping out gas in the high-pressure chamber and the low-pressure chamber respectively; the third pressure transmitter and the fourth pressure transmitter can convert the pressure of the gas pumped by the first vacuum pump and the second vacuum pump from the high-pressure chamber and the low-pressure chamber respectively into a pneumatic signal or an electric signal, and the pneumatic signal or the electric signal is transmitted to a data acquisition and analysis system for analysis and processing; irradiating the surface of the pressure-sensitive paint test sample wafer by an ultraviolet LED light source; the photomultiplier can collect the light intensity signal on the surface of the pressure-sensitive paint test sample, convert the light intensity signal into an electric signal and transmit the electric signal to an oscilloscope for spectral analysis; the tissue exciting light can conveniently enter the photomultiplier through the optical filter; the surface of the pressure-sensitive paint test sample wafer is conveniently irradiated by an ultraviolet LED light source through the optical glass, and meanwhile, the surface light intensity signals of the pressure-sensitive paint test sample wafer are conveniently acquired by the photomultiplier through the optical glass; the pressure information of the high-pressure chamber and the low-pressure chamber, the temperature information of the low-pressure chamber, the pressure information of the gas pumped by the first vacuum pump and the pressure information of the gas pumped by the first vacuum pump are collected, analyzed and stored by a data collecting and analyzing system in the test process, and the test parameters can be regulated and controlled according to the information data; the data after processing and analysis of the data acquisition and analysis system is conveniently output through the output equipment for test reference; processing a light intensity signal of the surface of a pressure-sensitive paint test sample wafer acquired by a photomultiplier and dynamic pressure change information in a low-pressure chamber through an oscilloscope, converting a reference time pressure curve formed after a reference voltage value with a time sequence is converted into a reference pressure value into a reference spectrogram, and thus realizing dynamic calibration of the quick-response pressure-sensitive paint; by the aid of the quick-response dynamic calibration device for the pressure-sensitive paint, the photomultiplier, the ultraviolet LED light source, the oscilloscope and the data acquisition and analysis system are matched, PSP pressure measurement can be performed in a known unsteady-frequency step change flow field, the response time of the used paint is determined by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive paint changing along with the step pressure, and accordingly dynamic calibration of the quick-response pressure-sensitive paint is achieved.
The invention is further configured to: the high-pressure air source equipment is connected with a three-way pipe, the outlet end of the three-way pipe is respectively connected with a high-pressure chamber and a low-pressure chamber, a branch pipe of the three-way pipe, which is close to the low-pressure chamber, is provided with a low-pressure section inflation valve, and a branch pipe of the three-way pipe, which is close to the high-pressure chamber, is provided with a high-pressure section; and a main valve is arranged on the branch pipe of the three-way pipe close to the high-pressure air source equipment.
By adopting the technical scheme, the high-pressure gas source equipment can conveniently and respectively increase gas sources for the high-pressure chamber and the low-pressure chamber through the three-way pipe; the low-pressure section inflation valve is convenient for inflating the low-pressure chamber; the high-pressure section charging valve is convenient for charging the high-pressure chamber; the gas transmission quantity of the high-pressure gas source equipment is convenient to adjust through the main valve.
The invention is further configured to: first pipeline and second pipeline lateral wall all are equipped with oil gas valve.
Through adopting above-mentioned technical scheme, through the oil gas valve, be convenient for regulate and control first vacuum pump and second vacuum pump and take out the volume of gas.
The invention is further configured to: and the outer wall of the high-pressure chamber is provided with a vent valve.
Through adopting above-mentioned technical scheme, through atmospheric valve, be convenient for release high-pressure indoor gaseous operation.
The invention is further configured to: the end part of the low-pressure chamber far away from the high-pressure chamber is provided with a sample fixing seat, and the pressure-sensitive paint test sample wafer is connected with the surface of the sample fixing seat in the low-pressure chamber.
By adopting the technical scheme, the pressure-sensitive paint test sample wafer is convenient to mount and fix through the sample fixing seat.
The invention is further configured to: the high-pressure air source equipment is an air compressor or a high-pressure air bottle.
Through adopting above-mentioned technical scheme, high-pressure gas source equipment is air compressor or high-pressure gas cylinder, is convenient for provide the gas source for hyperbaric chamber and low-pressure chamber.
In conclusion, the invention has the following beneficial effects: any flow generated in the shock tube can be prevented by the film clamping mechanism in the shock tube; the high-pressure gas source equipment connected with the shock tube can provide a high-pressure gas source for the shock tube; the pressure of the high-pressure chamber and the pressure of the low-pressure chamber can be converted into pneumatic signals or electric signals through the first pressure transmitter and the second pressure transmitter respectively, and the pneumatic signals or the electric signals are transmitted to a data acquisition and analysis system for analysis and processing, so that the pressure in the high-pressure chamber and the pressure in the low-pressure chamber can be conveniently controlled; the pressure in the low-pressure chamber can be conveniently measured and adjusted through the low-pressure section pressure measuring valve; the pressure sensor can sense dynamic pressure change signals in the low-pressure chamber of the shock tube, convert the pressure change signals into electric signals and transmit the electric signals to the oscilloscope for processing, and meanwhile, the pressure change signals in the low-pressure chamber sensed by the pressure sensor can provide trigger signals for quick response pressure sensitive paint measurement; the temperature sensor can measure the indoor temperature value information of the low pressure and transmit the information to the data acquisition and analysis system for analysis and storage; the flow speed information of the gas in the low-pressure chamber can be measured through the speed measuring sensor, and the flow speed information of the gas is transmitted to the data acquisition and analysis system for analysis and storage; the first vacuum pump and the second vacuum pump are used for conveniently pumping out gas in the high-pressure chamber and the low-pressure chamber respectively; the third pressure transmitter and the fourth pressure transmitter can convert the pressure of the gas pumped by the first vacuum pump and the second vacuum pump from the high-pressure chamber and the low-pressure chamber respectively into a pneumatic signal or an electric signal, and the pneumatic signal or the electric signal is transmitted to a data acquisition and analysis system for analysis and processing; irradiating the surface of the pressure-sensitive paint test sample wafer by an ultraviolet LED light source; the photomultiplier can collect the light intensity signal on the surface of the pressure-sensitive paint test sample, convert the light intensity signal into an electric signal and transmit the electric signal to an oscilloscope for spectral analysis; the tissue exciting light can conveniently enter the photomultiplier through the optical filter; the surface of the pressure-sensitive paint test sample wafer is conveniently irradiated by an ultraviolet LED light source through the optical glass, and meanwhile, the surface light intensity signals of the pressure-sensitive paint test sample wafer are conveniently acquired by the photomultiplier through the optical glass; the pressure information of the high-pressure chamber and the low-pressure chamber, the temperature information of the low-pressure chamber, the pressure information of the gas pumped by the first vacuum pump and the pressure information of the gas pumped by the first vacuum pump are collected, analyzed and stored by a data collecting and analyzing system in the test process, and the test parameters can be regulated and controlled according to the information data; the data after processing and analysis of the data acquisition and analysis system is conveniently output through the output equipment for test reference; processing a light intensity signal of the surface of the pressure-sensitive paint test sample and dynamic pressure change information in the low-pressure chamber, which are acquired by a photomultiplier through an oscilloscope, and converting a reference time pressure curve formed after a reference voltage value with a time sequence is converted into a reference pressure value into a reference spectrogram; by the aid of the quick-response dynamic calibration device for the pressure-sensitive paint, the photomultiplier, the ultraviolet LED light source, the oscilloscope and the data acquisition and analysis system are matched, PSP pressure measurement can be performed in a known unsteady-frequency step change flow field, the response time of the used paint is determined by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive paint changing along with the step pressure, and accordingly dynamic calibration of the quick-response pressure-sensitive paint is achieved.
Drawings
Fig. 1 is a schematic structural diagram in an embodiment of the present invention.
In the figure: 1. a shock tube; 2. a high pressure gas source device; 3. a pressure measurement control system; 4. sensitive paint test sample; 5. a photomultiplier tube; 6. an ultraviolet LED light source; 7. an optical filter; 8. a data acquisition and analysis system; 9. an output device; 10. a film clamping mechanism; 11. a high pressure chamber; 12. a low pressure chamber; 13. a first conduit; 14. a second conduit; 15. a first vacuum pump; 16. a second vacuum pump; 17. an optical glass; 18. a temperature sensor; 19. a temperature measuring system; 20. a speed measuring sensor; 21. a speed measuring system; 22. a pressure sensor; 23. an oscilloscope; 24. a first pressure transmitter; 25. a second pressure transmitter; 26. a third pressure transmitter; 27. a fourth pressure transmitter; 28. a three-way pipe; 29. a low pressure section charging valve; 30. a high pressure section charging valve; 31. an oil and gas valve; 32. an atmospheric valve; 33. a sample holder; 34. a main valve; 35. and a low-pressure section pressure measuring valve.
Detailed Description
The present invention is described in further detail below with reference to fig. 1.
Example (b): a quick-response dynamic calibration device for pressure-sensitive paint comprises a dynamic calibration system, wherein the dynamic calibration system is composed of a shock tube 1, a high-pressure air source device 2 connected with the shock tube 1, a pressure measurement control system 3, a pressure-sensitive paint test sample wafer 4, a photomultiplier 5 close to the pressure-sensitive paint test sample wafer 4, an ultraviolet LED light source 6, an optical filter 7 and a data acquisition and analysis system 8. The data acquisition and analysis system 8 is connected to an output device 9.
The shock tube 1 includes a high pressure chamber 11 and a low pressure chamber 12. The shock tube 1 is provided with a film clamping mechanism 10, and the film clamping mechanism 10 is positioned between a high-pressure chamber 11 and a low-pressure chamber 12. The high pressure chamber 11 and the low pressure chamber 12 are connected to a first vacuum pump 15 and a second vacuum pump 16 through a first pipe 13 and a second pipe 14, respectively. The side wall of the end part of the low-pressure chamber 12 far away from the high-pressure chamber 11 is optical glass 17, the pressure-sensitive paint test sample sheet 4 is positioned at the end part of the low-pressure chamber 12 far away from the high-pressure chamber 11, and the pressure-sensitive paint test sample sheet 4 is positioned in the optical glass 17. An ultraviolet LED light source 6 is close to the pressure sensitive paint test sample 4.
The outer wall of the low-pressure chamber 12 is provided with a temperature measuring system 19 formed by a temperature sensor 18.
The inner wall of the low-pressure chamber 12 is provided with a speed measuring system 21 consisting of a speed measuring sensor 20.
The inner wall of the low-pressure chamber 12 is provided with a pressure sensor 22, the pressure sensor 22 is connected with an oscilloscope 23, the oscilloscope 23 is connected with a photomultiplier 5 close to the pressure-sensitive paint test sample 4, and the optical filter 7 is arranged at the signal acquisition end of the photomultiplier 5.
The pressure measurement control system 3 comprises a first pressure transmitter 24 arranged in the high-pressure chamber 11, a second pressure transmitter 25 arranged in the low-pressure chamber 12, a third pressure transmitter 26 arranged in the first conduit 13 and a fourth pressure transmitter 27 arranged in the second conduit 14. The second pressure transmitter 25 is connected to a low pressure section pressure measurement valve 35.
The pressure measurement control system 3, the temperature measurement system 19 and the speed measurement system 21 are all connected with the data acquisition and analysis system 8.
In the embodiment, the shock tube 1 is used for conveniently generating pressure step change in the shock tube 1 so as to test the dynamic response characteristic of the quick-response pressure-sensitive paint. Before a dynamic calibration test is carried out on the quick response pressure-sensitive paint, any flow generated in the shock tube 1 can be prevented through the film clamping mechanism 10 in the shock tube 1. Then, a high-pressure gas source device 2 connected with the shock tube 1 can be used for providing a high-pressure gas source for the shock tube 1. During the process of supplying gas to the high-pressure chamber 11 of the shock tube 1 through the high-pressure gas source device 2, the pressure in the high-pressure chamber 11 of the shock tube 1 gradually rises, and the membrane of the membrane clamping mechanism 10 is gradually deformed until the membrane is broken under the pressure. After the diaphragm of the film clamping mechanism 10 is broken, the gas in the high-pressure chamber 11 pushes the gas in the low-pressure chamber 12 to move forward, and the front of the moving gas forms a clean discontinuity, namely shock wave. When the shock wave reaches the surface of the pressure-sensitive paint test sample 4 coated with the quick-response pressure-sensitive paint, a transient continuous pressure step can be applied to the surface of the pressure-sensitive paint test sample 4, the climbing time of the pressure step is much faster than the following time of the quick-response pressure-sensitive paint, and the pressure step can be used for calibrating the dynamic characteristics of the quick-response pressure-sensitive paint. The pressure of the high pressure chamber 11 and the pressure of the low pressure chamber 12 can be converted into a pneumatic signal or an electric signal by the first pressure transmitter 24 and the second pressure transmitter 25, and the pneumatic signal or the electric signal is transmitted to the data acquisition and analysis system 8 for analysis and processing, so that the pressure in the high pressure chamber 11 and the pressure in the low pressure chamber 12 can be controlled conveniently. The pressure in the low-pressure chamber 12 can be conveniently measured and adjusted through the low-pressure section pressure measuring valve 35. The pressure sensor 22 can sense the dynamic pressure change signal in the low-pressure chamber 12 of the shock tube 1, convert the pressure change signal into an electric signal and transmit the electric signal to the oscilloscope 23 for processing, and meanwhile, the pressure change signal in the low-pressure chamber 12 sensed by the pressure sensor 22 can provide a trigger signal for the quick-response pressure-sensitive paint measurement. Temperature sensor 18 is capable of measuring temperature information within low pressure chamber 12 and transmitting this information to data acquisition and analysis system 8 for analysis and storage. The velocity sensor 20 can measure the flow velocity information of the gas in the low pressure chamber 12, and transmit the flow velocity information of the gas to the data acquisition and analysis system 8 for analysis and storage. The evacuation of the gases in the high pressure chamber 11 and the low pressure chamber 12, respectively, is facilitated by a first vacuum pump 15 and a second vacuum pump 16. Through the third pressure transmitter 26 and the fourth pressure transmitter 27, the pressures of the gases pumped out from the high pressure chamber 11 and the low pressure chamber 12 by the first vacuum pump 15 and the second vacuum pump 16 respectively can be converted into pneumatic signals or electric signals, and the pneumatic signals or the electric signals are transmitted to the data acquisition and analysis system 8 for analysis and processing. And an ultraviolet LED light source 6 is used for irradiating the surface of the pressure-sensitive paint test sample 4. The photomultiplier 5 can collect the light intensity signal on the surface of the pressure-sensitive paint test sample 4, convert the light intensity signal into an electric signal and transmit the electric signal to the oscilloscope 23 for spectrum analysis. The tissue excitation light is facilitated to enter the photomultiplier tube 5 through the optical filter 7. Through optical glass 17, be convenient for ultraviolet LED light source 6 to the irradiation on pressure sensitive paint test sample 4 surface, simultaneously, through optical glass 17, be convenient for photomultiplier 5 to the collection of pressure sensitive paint test sample 4 surface light intensity signal. Through the data acquisition and analysis system 8, the pressure information of the high-pressure chamber 11 and the low-pressure chamber 12, the temperature information of the low-pressure chamber 12, the pressure information of the gas pumped by the first vacuum pump 15 and the pressure information of the gas pumped by the first vacuum pump 15, which are acquired in the test process, are acquired, analyzed and stored, and the test parameters can be regulated and controlled according to the information data. Through the output device 9, the data output after the processing and analysis of the data acquisition and analysis system 8 is facilitated, so as to be used for test reference. The light intensity signal of the surface of the pressure-sensitive paint test sample 4 acquired by the photomultiplier 5 and the dynamic pressure change information in the low-pressure chamber 12 are processed by the oscilloscope 23, and a reference time pressure curve formed after a reference voltage value with a time sequence is converted into a reference pressure value is converted into a reference spectrogram, so that the dynamic calibration of the quick-response pressure-sensitive paint is realized. By the aid of the quick-response dynamic pressure-sensitive paint calibration device, the photomultiplier 5, the ultraviolet LED light source 6, the oscilloscope 23 and the data acquisition and analysis system 8 are matched, PSP pressure measurement can be performed in a known unsteady-frequency step change flow field, the response time of the used paint is determined by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive paint changing along with the step pressure, and accordingly dynamic calibration of the quick-response pressure-sensitive paint is achieved.
The high-pressure air source equipment 2 is connected with a three-way pipe 28, the outlet end of the three-way pipe 28 is respectively connected with the high-pressure chamber 11 and the low-pressure chamber 12, a branch pipe of the three-way pipe 28 close to the low-pressure chamber 12 is provided with a low-pressure section inflation valve 29, a branch pipe of the three-way pipe 28 close to the high-pressure chamber 11 is provided with a high-pressure section inflation valve 30, and a branch pipe of the three-way pipe 28 close to the high-pressure.
In this embodiment, the high pressure gas source device 2 is facilitated to increase the gas source to the high pressure chamber 11 and the low pressure chamber 12 respectively through the tee pipe 28. The operation of charging the low pressure chamber 12 is facilitated by the low pressure stage charging valve 29. The operation of inflating the high pressure chamber 11 is facilitated by the high pressure section inflation valve 30. The gas transmission quantity of the high-pressure gas source device 2 is convenient to adjust through the main valve 34.
The side walls of the first pipeline 13 and the second pipeline 14 are provided with oil and gas valves 31.
In the present embodiment, the amount of gas pumped out by the first vacuum pump 15 and the second vacuum pump 16 is conveniently controlled by the oil-gas valve 31.
And a vent valve 32 is arranged on the outer wall of the high-pressure chamber 11.
In this embodiment, the operation of releasing the gas in the high pressure chamber 11 is facilitated by the blow valve 32.
The end part of the low-pressure chamber 12 far away from the high-pressure chamber 11 is provided with a sample fixing seat 33, and the pressure-sensitive paint test sample 4 is connected with the surface of the sample fixing seat 33 positioned in the low-pressure chamber 12.
In this embodiment, the sample holder 33 facilitates the mounting and fixing of the pressure-sensitive paint test sample 4.
The high-pressure air source device 2 is an air compressor or a high-pressure air bottle.
In this embodiment, the high pressure gas source device 2 is an air compressor or a high pressure gas cylinder, which is convenient for providing a gas source for the high pressure chamber 11 and the low pressure chamber 12.
The working principle is as follows: before a dynamic calibration test is carried out on the quick response pressure-sensitive paint, any flow generated in the shock tube 1 can be prevented by using the film clamping mechanism 10 in the shock tube 1. By utilizing the shock tube 1, pressure step change can be conveniently generated in the shock tube 1 so as to test the dynamic response characteristic of the quick response pressure sensitive paint. The high-pressure air source equipment 2 connected with the shock tube 1 is adopted to provide a high-pressure air source for the shock tube 1. During the process of supplying gas to the high-pressure chamber 11 of the shock tube 1 through the high-pressure gas source device 2, the pressure in the high-pressure chamber 11 of the shock tube 1 gradually rises, and the membrane of the membrane clamping mechanism 10 is gradually deformed until the membrane is broken under the pressure. After the diaphragm of the film clamping mechanism 10 is broken, the gas in the high-pressure chamber 11 pushes the gas in the low-pressure chamber 12 to move forward, and the front of the moving gas forms a clean discontinuity, namely shock wave. When the shock wave reaches the surface of the pressure-sensitive paint test sample 4 coated with the quick-response pressure-sensitive paint, a transient continuous pressure step can be applied to the surface of the pressure-sensitive paint test sample 4, the climbing time of the pressure step is much faster than the following time of the quick-response pressure-sensitive paint, and the pressure step can be used for calibrating the dynamic characteristics of the quick-response pressure-sensitive paint. The pressure of the high pressure chamber 11 and the pressure of the low pressure chamber 12 can be converted into a pneumatic signal or an electric signal by the first pressure transmitter 24 and the second pressure transmitter 25, and the pneumatic signal or the electric signal is transmitted to the data acquisition and analysis system 8 for analysis and processing, so that the pressure in the high pressure chamber 11 and the pressure in the low pressure chamber 12 can be controlled conveniently. The pressure in the low-pressure chamber 12 can be conveniently measured and adjusted through the low-pressure section pressure measuring valve 35. The pressure sensor 22 can sense the dynamic pressure change signal in the low-pressure chamber 12 of the shock tube 1, convert the pressure change signal into an electric signal and transmit the electric signal to the oscilloscope 23 for processing, and meanwhile, the pressure change signal in the low-pressure chamber 12 sensed by the pressure sensor 22 can provide a trigger signal for the quick-response pressure-sensitive paint measurement. Temperature sensor 18 is capable of measuring temperature information within low pressure chamber 12 and transmitting this information to data acquisition and analysis system 8 for analysis and storage. The velocity sensor 20 can measure the flow velocity information of the gas in the low pressure chamber 12, and transmit the flow velocity information of the gas to the data acquisition and analysis system 8 for analysis and storage. The evacuation of the gases in the high pressure chamber 11 and the low pressure chamber 12, respectively, is facilitated by a first vacuum pump 15 and a second vacuum pump 16. Through the third pressure transmitter 26 and the fourth pressure transmitter 27, the pressures of the gases pumped out from the high pressure chamber 11 and the low pressure chamber 12 by the first vacuum pump 15 and the second vacuum pump 16 respectively can be converted into pneumatic signals or electric signals, and the pneumatic signals or the electric signals are transmitted to the data acquisition and analysis system 8 for analysis and processing. And an ultraviolet LED light source 6 is used for irradiating the surface of the pressure-sensitive paint test sample 4. The photomultiplier 5 can collect the light intensity signal on the surface of the pressure-sensitive paint test sample 4, convert the light intensity signal into an electric signal and transmit the electric signal to the oscilloscope 23 for spectrum analysis. The tissue excitation light is facilitated to enter the photomultiplier tube 5 through the optical filter 7. Through the data acquisition and analysis system 8, the pressure information of the high-pressure chamber 11 and the low-pressure chamber 12, the temperature information of the low-pressure chamber 12, the pressure information of the gas pumped by the first vacuum pump 15 and the pressure information of the gas pumped by the first vacuum pump 15, which are acquired in the test process, are acquired, analyzed and stored, and the test parameters can be regulated and controlled according to the information data. Through the output device 9, the data output after the processing and analysis of the data acquisition and analysis system 8 is facilitated, so as to be used for test reference. The light intensity signal of the surface of the pressure-sensitive paint test sample 4 acquired by the photomultiplier 5 and the dynamic pressure change information in the low-pressure chamber 12 are processed by the oscilloscope 23, and a reference time pressure curve formed after a reference voltage value with a time sequence is converted into a reference pressure value is converted into a reference spectrogram, so that the dynamic calibration of the quick-response pressure-sensitive paint is realized. By the aid of the quick-response dynamic pressure-sensitive paint calibration device, the photomultiplier 5, the ultraviolet LED light source 6, the oscilloscope 23 and the data acquisition and analysis system 8 are matched, PSP pressure measurement can be performed in a known unsteady-frequency step change flow field, the response time of the used paint is determined by observing the attenuation time of a light intensity signal emitted by the pressure-sensitive paint changing along with the step pressure, and accordingly dynamic calibration of the quick-response pressure-sensitive paint is achieved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides a quick-response pressure sensitive paint developments calibration device which characterized by: the device comprises a dynamic calibration system, wherein the dynamic calibration system consists of a shock tube (1), high-pressure air source equipment (2) connected with the shock tube (1), a pressure measurement control system (3), a pressure-sensitive paint test sample wafer (4), a photomultiplier (5) close to the pressure-sensitive paint test sample wafer (4), an ultraviolet LED light source (6), an optical filter (7) and a data acquisition and analysis system (8); the data acquisition and analysis system (8) is connected with an output device (9);
the shock tube (1) comprises a high-pressure chamber (11) and a low-pressure chamber (12); the shock tube (1) is provided with a film clamping mechanism (10), and the film clamping mechanism (10) is positioned between a high-pressure chamber (11) and a low-pressure chamber (12); the side walls of the high-pressure chamber (11) and the low-pressure chamber (12) are respectively connected with a first vacuum pump (15) and a second vacuum pump (16) through a first pipeline (13) and a second pipeline (14); the side wall of the end part of the low-pressure chamber (12) far away from the high-pressure chamber (11) is optical glass (17), the pressure-sensitive paint test sample sheet (4) is positioned at the end part of the low-pressure chamber (12) far away from the high-pressure chamber (11), and the pressure-sensitive paint test sample sheet (4) is positioned in the optical glass (17); the ultraviolet LED light source (6) is close to the pressure-sensitive paint test sample wafer (4);
the outer wall of the low-pressure chamber (12) is provided with a temperature measuring system (19) consisting of a temperature sensor (18);
a speed measuring system (21) consisting of a speed measuring sensor (20) is arranged on the inner wall of the low-pressure chamber (12);
the inner wall of the low-pressure chamber (12) is provided with a pressure sensor (22), the pressure sensor (22) is connected with an oscilloscope (23), the oscilloscope (23) is connected with a photomultiplier (5) close to the pressure-sensitive paint test sample wafer (4), and the optical filter (7) is installed at the signal acquisition end of the photomultiplier (5);
the pressure measurement control system (3) comprises a first pressure transmitter (24) arranged in the high-pressure chamber (11), a second pressure transmitter (25) arranged in the low-pressure chamber (12), a third pressure transmitter (26) arranged in the first pipeline (13) and a fourth pressure transmitter (27) arranged in the second pipeline (14); the second pressure transmitter (25) is connected with a low-pressure section pressure measuring valve (35);
the pressure measurement control system (3), the temperature measurement system (19) and the speed measurement system (21) are all connected with the data acquisition and analysis system (8).
2. The dynamic calibration device for the quick-response pressure-sensitive paint as claimed in claim 1, wherein: the high-pressure air source equipment (2) is connected with a three-way pipe (28), the outlet end of the three-way pipe (28) is respectively connected with a high-pressure chamber (11) and a low-pressure chamber (12), a branch pipe of the three-way pipe (28) close to the low-pressure chamber (12) is provided with a low-pressure section inflation valve (29), a branch pipe of the three-way pipe (28) close to the high-pressure chamber (11) is provided with a high-pressure section inflation valve (30), and a branch pipe of the three-way pipe (28) close to the high-pressure air source equipment (2) is provided with.
3. The dynamic calibration device for the quick-response pressure-sensitive paint as claimed in claim 1, wherein: the first pipeline (13) and the second pipeline (14) are provided with oil and gas valves (31) on the side walls.
4. The dynamic calibration device for the quick-response pressure-sensitive paint as claimed in claim 1, wherein: and an emptying valve (32) is arranged on the outer wall of the high-pressure chamber (11).
5. The dynamic calibration device for the quick-response pressure-sensitive paint as claimed in claim 1, wherein: the end part of the low-pressure chamber (12) far away from the high-pressure chamber (11) is provided with a sample fixing seat (33), and the pressure-sensitive paint test sample wafer (4) is connected with the surface of the sample fixing seat (33) inside the low-pressure chamber (12).
6. The dynamic calibration device for the quick-response pressure-sensitive paint as claimed in claim 1, wherein: the high-pressure air source equipment (2) is an air compressor or a high-pressure air bottle.
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| CN201911353099.2A CN110987358A (en) | 2019-12-25 | 2019-12-25 | Quick-response pressure-sensitive paint dynamic calibration device |
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| CN201911353099.2A CN110987358A (en) | 2019-12-25 | 2019-12-25 | Quick-response pressure-sensitive paint dynamic calibration device |
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| CN112113702A (en) * | 2020-09-23 | 2020-12-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure-sensitive paint response time calibration device based on non-electric detonator driving type shock tube |
| CN112113704A (en) * | 2020-09-23 | 2020-12-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure-sensitive paint response time calibration method based on non-electric detonator driving type shock tube |
| CN113252240A (en) * | 2021-05-11 | 2021-08-13 | 西北工业大学 | Portable optical pressure sensitive coating static pressure calibration cabin and calibration method |
| CN113484026A (en) * | 2021-06-23 | 2021-10-08 | 上海交通大学 | Shock wave focusing ignition and corresponding ignition characteristic measuring device and method |
| CN114739626A (en) * | 2022-06-13 | 2022-07-12 | 中国空气动力研究与发展中心高速空气动力研究所 | Rotating blade grid pressure measurement test method based on quick response pressure-sensitive paint |
| CN116907789A (en) * | 2023-09-12 | 2023-10-20 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
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| CN112113702A (en) * | 2020-09-23 | 2020-12-22 | 中国空气动力研究与发展中心高速空气动力研究所 | Pressure-sensitive paint response time calibration device based on non-electric detonator driving type shock tube |
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| CN113484026A (en) * | 2021-06-23 | 2021-10-08 | 上海交通大学 | Shock wave focusing ignition and corresponding ignition characteristic measuring device and method |
| CN114739626A (en) * | 2022-06-13 | 2022-07-12 | 中国空气动力研究与发展中心高速空气动力研究所 | Rotating blade grid pressure measurement test method based on quick response pressure-sensitive paint |
| CN116907789A (en) * | 2023-09-12 | 2023-10-20 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
| CN116907789B (en) * | 2023-09-12 | 2023-11-28 | 中国航空工业集团公司沈阳空气动力研究所 | Multi-system synchronous identification method and device based on pressure measurement |
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