CN109297678A - A kind of cavitation gas-liquid flow field measuring system based on conducting probe - Google Patents
A kind of cavitation gas-liquid flow field measuring system based on conducting probe Download PDFInfo
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- CN109297678A CN109297678A CN201811311409.XA CN201811311409A CN109297678A CN 109297678 A CN109297678 A CN 109297678A CN 201811311409 A CN201811311409 A CN 201811311409A CN 109297678 A CN109297678 A CN 109297678A
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- probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The cavitation gas-liquid flow field measuring system based on conducting probe that the invention discloses a kind of, system include water tunnel test section, high speed video subsystem, probe subsystem, triggering subsystem and Synchronization Analysis subsystem；Probe subsystem is located at water tunnel test intersegmental part, the probe subsystem calculates the movement speed of bubble using same bubble by the time difference of probe subsystem different location, and flow field specific position transient state and average void fraction is calculated using the time that probe subsystem is in state of insulation and stores；Triggering subsystem triggers high speed video subsystem simultaneously and probe subsystem works；The signal that Synchronization Analysis subsystem respectively acquires high speed video subsystem and probe subsystem is handled, and Synchronization Analysis subsystem is managed by unified time, realizes the Synchronization Analysis to image and probe signals.The present invention can finely measure different cavitation stage liquid phase distributions and phase velocity and specific void structure.
Description
Technical field
The present invention relates to a kind of cavitation gas-liquid flow field measuring systems, and in particular to a kind of flow field survey based on conducting probe
System belongs to multiphase flow detection technique field.
Background technique
Cavitation unavoidably betides under the operating conditions such as hydraulic, high-speed thruster, underwater ordnance, the generation of cavitation
The fatigue rupture of pressure fluctuation, vibration, noise and structure member will be brought.Cavitation is exchanged for spy with violent gas-liquid interphase mass
Sign, is the successional mechanical failure of liquid medium, once occurring, will significantly change flow field structure.Cavitation contains the life of vacuole
It is long, develop, fracture, the unsteady process such as fall off, with the strong non-thread of multiphase flow, turbulent flow, compressible, unstability and phase transformation
The complex characteristics of property close coupling.Due to national security and the demand of the national economic development, domestic and international many researchers are constantly deep
Enter the research to cavitation phenomenon.Due to the complexity of cavitation phenomenon, cavitation models still prematurity, in model many parameters need through
Acquisition is tested or tests, experimental technique is the most important means of cavitation research.
Studies have shown that it is hydrokinetic that Bubble fraction distribution and its evolution, which are the important parameters flowed, in cavitating flows
Main source, and it was found that with the increase of void fraction, the velocity of sound of cavitation mixed phase medium can be significantly reduced, far below pure vapour phase with
Pure liquid phase, even up to several metre per second (m/s)s, so that local airflow reaches supersonic condition, therefore high local Mach number is cavitating flows
Key property, the main reason for being fluid dynamic, and the determination of Mach number depends on the measurement of local flow velocity.Cavitation flows at present
Dynamic common experimental technology such as high speed video and PIV are directed to macroscopical gas-liquid pattern and sports ground single-measurement respectively, can not obtain simultaneously
Vacuole structural parameters and motion information are obtained, and single vacuole scale can not be deep into.Existing research shows that conducting probe technology is made
For the important measuring technique of two phase flow, although a kind of contact type measurement, have is not influenced by operator's qualification, is rung
Should be fast, convenient for coupling with computer, measuring speed and feature with high accuracy can carry out large sample real-time measurement, can also be directly
Export electric signal.Due to the volume very little of probe, it can be placed in any position in equipment under test, and hardly interference flowing field, it surveys
Accuracy of measurement is high.Dual-head single-screw pump can be realized while measuring local void fraction and speed simultaneously, obtain cavitation zone Mach number
The advantages of parameter, finely measures for cavitation gas-liquid flow field and provides possibility.
Currently, probe technique is mainly used in multiphase flow measurement field, since cavitation gas-liquid flow field is carried with transient impact
It the characteristics of lotus, high pressure pulsation, unsteady, turbulent flow is compressible, and phase transformation etc. is substantially distinguished from multiphase flow, needs development and is suitable for
The conducting probe technology of cavitation gas-liquid flow field measurement
Summary of the invention
In view of this, the present invention provides a kind of cavitation gas-liquid flow field measuring system based on conducting probe, system is used
Synchronous triggering technique, realizes the synchro measure to macroscopical hole form and partial cavity's parameter.It can finely be surveyed by the system
Measure different cavitation stage liquid phase distributions and phase velocity and specific void structure.
A kind of cavitation gas-liquid flow field measuring system based on conducting probe, measuring system includes water tunnel test section, and high speed is recorded
As subsystem, probe subsystem, triggering subsystem and Synchronization Analysis subsystem；
The probe subsystem is located at water tunnel test intersegmental part, and the probe subsystem is using same bubble by probe
The time difference of system different location calculates the movement speed of bubble, is calculated using the time that probe subsystem is in state of insulation
It obtains flow field specific position transient state and average void fraction and stores；The triggering subsystem trigger simultaneously high speed video subsystem and
Probe subsystem works；The letter that the Synchronization Analysis subsystem respectively acquires high speed video subsystem and probe subsystem
It number is handled, Synchronization Analysis subsystem passes through unified time and manages, and realizes the Synchronization Analysis to image and probe signals.
Further, the water tunnel test section includes test section and transparent organic glass；The test section is rectangular cross section
The wedge structure of structure, bottom arrangement forms shrinkage expansion runner, and cavitation betides expansion segment flow separation regions, described
Cavitation generation area is disposed with probe subsystem；Test section top surface, front and side are for convenience of the organic glass observed.
Further, high speed video subsystem includes illumination dysprosium lamp, high speed camera and image capture instrument；The high speed camera
The picture of shooting is by image capture instrument acquisition and storage.
Further, the probe subsystem includes probe, circuit for signal conditioning and signal sampler；The probe includes
Preceding probe, rear probe and shell, the preceding probe and rear probe are solidificated in the inside of shell, the surface of probe by dielectric
Upper covering insulating layer, head reserve one section of turning part；
The earthing of casing, preceding probe and rear probe constitute two circuits with cage connection respectively；Preceding probe and rear probe
The signal of output respectively enters circuit for signal conditioning；Input signal acquires after the circuit for signal conditioning amplifies Continuity signal
Instrument.
Further, the circuit for signal conditioning is put by resistance (R1, R2, R3, R4, R5, R6), capacitor (C1, C2), isolation
Big device and differential scale operation device composition；Resistance R1 and capacitor C1 is composed in series the first rank low-pass filter circuit, C1 ground connection；Resistance
Second-order low-pass filter circuit, C2 ground connection are composed in parallel after R2 and capacitor C2 series connection with capacitor C1；The voltage at the both ends capacitor C2 is believed
Number entering back into isolated amplifier amplifies, and is exported by two output ends of isolated amplifier, into differential scale operation
It is exported outward after electric appliance；The signal of isolated amplifier positive output end is added to operation amplifier by a resistance R5 and divider resistance R6
The non-inverting input terminal of device, R5 and R6 series connection, R6 ground connection；The signal of isolated amplifier negative output terminal is added to operation by resistance R3 and puts
The inverting input terminal of big device, resistance R4 are connected across between inverting input terminal and output end, are formed profound and negative feedbck, are made operation amplifier
Device works in linear condition.
Wherein second-order low-pass filter upper cut-off frequency is 10kHz, for eliminating the high-frequency noise in signal；Isolation is put
Signal is isolated and is amplified by big device, weakens the electromagnetic interference in environment；Differential scale operation device further puts signal
Greatly, to meet the needs of follow-up signal Acquisition Instrument.
Further, the triggering subsystem includes synchronous trigger switch and trigger signal adjuster；Trigger signal tune
Section device is digital delay generator, has multiple output channels, can generate the pulse triggering signal of Multi-path synchronous simultaneously；Pulse
Signal triggers required voltage using the amplification of in-phase proportion amplifying circuit in trigger signal adjuster to reach, to rise
To the effect for triggering high speed camera and signal sampler simultaneously.
Further, the Synchronization Analysis subsystem includes two computers, and a computer acquires image capture instrument
Image handled, another computer handles the probe signals of signal sampler, two computers pass through unification
The Synchronization Analysis to image and probe signals is realized in time management.
The utility model has the advantages that
1, system of the invention uses more field synchronization measuring techniques, realizes image capturing system and probe measuring system
Synchronously control.
2, the present invention can be realized the same pacing to macroscopical hole evolutionary process and cavitation gas-liquid flow field microscopic bubble parameter
Amount provides means to analyse in depth cavitation gas-liquid flow field characteristic.
3, the present invention compared with prior art, can not only measure two phase flow, it is contemplated that the high transient state load of cavitation gas-liquid flow field,
The measurement to unsteady cavitating flows may be implemented, provide foundation for cavitating flows fining measurement；
4, the synchro measure of void fraction and phase velocity under specific cavitation structure may be implemented in the present invention, can obtain cavitation Jie
Mach number state in matter.
Detailed description of the invention
Fig. 1 is present system composition schematic diagram
Fig. 2 is conducting probe systematic survey flow chart of the present invention
Fig. 3 is probe structure schematic diagram
Fig. 4 is that probe signals adjust circuit structure diagram
Fig. 5 is that trigger signal adjusts circuit structure diagram
Wherein: probe, 4- circuit for signal conditioning, 5- signal sampler, 6- are same after probe, 3- before 1- water tunnel test section, 2-
Walk trigger switch, 7- dysprosium lamp, 8- high speed camera, 9- image capture instrument, 10- image computer, 11- signal computer, outside 12-
Shell, 13- dielectric, the turning part 14-.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
As shown in Fig. 1, the cavitation gas-liquid flow field measuring system based on conducting probe that the present invention provides a kind of, including water
Hole test section 1, high speed video subsystem, probe subsystem, triggering subsystem and Synchronization Analysis subsystem；The conducting probe system
Image acquisition subsystem triggering synchronous with probe subsystem is controlled by synchronous trigger switch, when the expansion stream of water tunnel test section
When generating typical cavitating flows form in road, after flowing and stablizing, synchronous trigger switch 6 is closed, realizes image and probe signals
Acquisition is synchronized by the frequency respectively set.
Image measurement subsystem is made of dysprosium lamp 7, high speed camera 8, image capture instrument 9 and image computer 10；Dysprosium lamp 7 is made
For light source, picture of the high speed camera 8 to shoot experimental section in experimentation, captured picture is acquired by image capture instrument 9
And storage, quantitative image processing is carried out in image computer 10 later.
Probe subsystem is made of probe, circuit for signal conditioning 4, signal sampler 5 and signal computer 11；Such as attached drawing
Shown in 3, probe is made of shell 12, preceding probe 2, rear probe 3 and dielectric 13；One layer of uniform insulation is covered on probe
Paint only reserves about 10~20 μm of length of turning part 14 on head.The shell 12 of probe is grounded, and preceding probe 2 and rear probe 3 divide
Two circuits are not connected and composed with shell 12, the signal entering signal that preceding probe 2 and rear probe 3 export adjusts circuit 4.
As shown in Fig. 4, circuit for signal conditioning is put by resistance (R1, R2, R3, R4, R5, R6), capacitor (C1, C2), isolation
Big device and differential scale operation device composition；Resistance R1 and capacitor C1 is composed in series the first rank low-pass filter circuit, C1 ground connection；Resistance
Second-order low-pass filter circuit, C2 ground connection are composed in parallel after R2 and capacitor C2 series connection with capacitor C1；The voltage at the both ends capacitor C2 is believed
Number entering back into isolated amplifier amplifies, and is exported by two output ends of isolated amplifier, into differential scale operation
It is exported outward after electric appliance；The signal u of isolated amplifier positive output end1It is added to operation by resistance R5 and a divider resistance R6 and puts
The non-inverting input terminal of big device, R5 and R6 series connection, R6 ground connection；The signal u of isolated amplifier negative output terminal2Fortune is added to by resistance R3
The inverting input terminal of amplifier is calculated, resistance R4 is connected across between inverting input terminal and output end, is formed profound and negative feedbck, is made operation
Amplifier operation is in linear condition.
Wherein low-pass filter circuit is second-order low-pass filter circuit, and the upper limit is 10kHz by frequency, for eliminating signal
In high-frequency noise；Signal is isolated and is amplified by isolated amplifier, weakens the electromagnetic interference in environment；Differential ratio fortune
Circuit is calculated, signal is further amplified, to meet the needs of follow-up signal Acquisition Instrument.Treated probe signals are adopted by signal
Collection instrument is acquired and records.The signal of last 11 pairs of computer acquisitions of signal is calculated and is handled, and it is gentle to obtain void fraction
Parameter needed for steeping rate etc..
Triggering subsystem is adjusted circuit and is formed (as shown in Fig. 5) by synchronizing trigger switch 6 and trigger signal；Synchronous triggering
Switch is digital delay generator, has multiple output channels, can generate the pulse triggering signal of Multi-path synchronous simultaneously.Pulse
Signal adjusts the amplification of in-phase proportion amplifying circuit in circuit using trigger signal, to reach the required voltage of triggering, thus
Play the role of while triggering high speed camera and signal sampler.
The course of work: firstly, checking probe electric conductivity and insulating properties, guarantee probe is in good conductivity shape
State connects each subsystem of the conducting probe system, checks connection correctness；Image acquisition subsystem and probe measurement are set
The frequency acquisition of system.Then, cavitation water hole is run, cavitating flows are generated, synchronous trigger switch is closed, realizes image and probe
The synchronous acquisition of signal.Trial inspection availability of data carries out next group of working condition acquiring if feasible, until experiment terminates.Most
Afterwards, image procossing is carried out to the image data of acquisition, obtains different void structures and develops；The probe signals that probe obtains are carried out
Signal processing, by filtering, denoising, the methods of correlation is based on Matlab software program, obtains Bubble Parameters, void fraction, bubble
The information such as diameter, bubble speed.Analysis is synchronized to image data and probe signals data, bubble under specific void structure is obtained and joins
Number characteristic.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of cavitation gas-liquid flow field measuring system based on conducting probe, which is characterized in that measuring system includes water tunnel test
Section, high speed video subsystem, probe subsystem, triggering subsystem and Synchronization Analysis subsystem；
The probe subsystem is located at water tunnel test intersegmental part, and the probe subsystem passes through probe subsystem using same bubble
The time difference of different location calculates the movement speed of bubble, is calculated using the time that probe subsystem is in state of insulation
Flow field specific position transient state and average void fraction simultaneously store；The triggering subsystem triggers high speed video subsystem and probe simultaneously
Subsystem works；The signal that the Synchronization Analysis subsystem respectively acquires high speed video subsystem and probe subsystem into
Row processing, Synchronization Analysis subsystem are managed by unified time, realize the Synchronization Analysis to image and probe signals.
2. cavitation gas-liquid flow field measuring system as described in claim 1, which is characterized in that the water tunnel test section includes test
Section and transparent organic glass；The test section is retangular section structure, and the wedge structure of bottom arrangement forms shrinkage expansion runner,
Cavitation betides expansion segment flow separation regions, is disposed with probe subsystem in the cavitation generation area；Test section top surface,
Front and side are for convenience of the organic glass observed.
3. cavitation gas-liquid flow field measuring system as claimed in claim 1 or 2, which is characterized in that the high speed video subsystem
Including dysprosium lamp, high speed camera and image capture instrument；The picture of the high speed camera shooting is by image capture instrument acquisition and storage.
4. cavitation gas-liquid flow field measuring system as described in claim 1, which is characterized in that the probe subsystem includes visiting
Needle, circuit for signal conditioning and signal sampler；The probe includes preceding probe, rear probe and shell, the preceding probe and afterwards spy
Needle is solidificated in the inside of shell by dielectric, and insulating layer is covered on the surface of probe, and head reserves one section of turning part；
The earthing of casing, preceding probe and rear probe constitute two circuits with cage connection respectively；Preceding probe and the output of rear probe
Signal respectively enter circuit for signal conditioning；Input signal Acquisition Instrument after the circuit for signal conditioning amplifies Continuity signal.
5. cavitation gas-liquid flow field measuring system as claimed in claim 4, which is characterized in that the circuit for signal conditioning is by resistance
(R1, R2, R3, R4, R5, R6), capacitor (C1, C2), isolated amplifier and differential scale operation device composition；Resistance R1 and capacitor C1
It is composed in series the first rank low-pass filter circuit, C1 ground connection；Second-order is composed in parallel with capacitor C1 after resistance R2 and capacitor C2 series connection
Low-pass filter circuit, C2 ground connection；The voltage signal at the both ends capacitor C2 enters back into isolated amplifier and amplifies, and is put by isolation
Two output ends output of big device, into differential scale operation electric appliance after export outward；The signal of isolated amplifier positive output end
The non-inverting input terminal of operational amplifier, R5 and R6 series connection, R6 ground connection are added to by resistance R5 and a divider resistance R6；Isolation is put
The signal of big device negative output terminal is added to the inverting input terminal of operational amplifier by resistance R3, and resistance R4 is connected across inverting input terminal
Between output end, profound and negative feedbck is formed, makes operational amplifier work in linear condition.
6. cavitation gas-liquid flow field measuring system as described in claim 1, which is characterized in that the triggering subsystem includes same
Walk trigger switch and trigger signal adjuster；Trigger signal adjuster is digital delay generator, has multiple output channels, can
To generate the pulse triggering signal of Multi-path synchronous simultaneously.Pulse signal amplifies electricity using in-phase proportion in trigger signal adjuster
The amplification on road, to reach the required voltage of triggering, to play the role of while trigger high speed camera and signal sampler.
7. cavitation gas-liquid flow field measuring system as described in claim 1, which is characterized in that the Synchronization Analysis subsystem includes
Two computers, the image that a computer acquires image capture instrument are handled, and another computer is to signal sampler
Probe signals handled, two computers pass through unified time and manage, and realize to the Synchronization Analysis of image and probe signals.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006628A (en) * | 2019-05-22 | 2019-07-12 | 北京理工大学 | Underwater propeller jet flow field visual inspection system based on circulating water tunnel |
| CN110988391A (en) * | 2019-12-12 | 2020-04-10 | 北京机电工程研究所 | Experimental method for measuring unsteady cavitation flow field velocity |
| CN113125511A (en) * | 2021-03-24 | 2021-07-16 | 上海交通大学 | Bubble parameter and boric acid concentration synchronous measurement dual-purpose probe system based on conductance method |
| CN114169267A (en) * | 2022-02-11 | 2022-03-11 | 中国空气动力研究与发展中心计算空气动力研究所 | Method for quickly searching entropy layer characteristic value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006628A (en) * | 2019-05-22 | 2019-07-12 | 北京理工大学 | Underwater propeller jet flow field visual inspection system based on circulating water tunnel |
| CN110988391A (en) * | 2019-12-12 | 2020-04-10 | 北京机电工程研究所 | Experimental method for measuring unsteady cavitation flow field velocity |
| CN113125511A (en) * | 2021-03-24 | 2021-07-16 | 上海交通大学 | Bubble parameter and boric acid concentration synchronous measurement dual-purpose probe system based on conductance method |
| CN114169267A (en) * | 2022-02-11 | 2022-03-11 | 中国空气动力研究与发展中心计算空气动力研究所 | Method for quickly searching entropy layer characteristic value |
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