CN104807612B - The many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel - Google Patents
The many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel Download PDFInfo
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- CN104807612B CN104807612B CN201510223779.8A CN201510223779A CN104807612B CN 104807612 B CN104807612 B CN 104807612B CN 201510223779 A CN201510223779 A CN 201510223779A CN 104807612 B CN104807612 B CN 104807612B
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Abstract
The present invention relates to a kind of many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel, belong to ship and submarine navigation device engineering, Hydraulic and Hydro-Power Engineering technical field.Annexation：Laser generator is sent laser and is irradiated on experimental model by laser guide arm；Laser guide arm is connected with laser generator, computer host box successively；The picture transfer of high speed camera collection is in computer host box；The pressure signal of pressure transducer collection is transferred in another computer by signal conditioner and data collecting card；Transparent organic glass is installed at the top of test section；Synchronous trigger switch controls high speed camera and data collecting card simultaneously.The present invention can realize Synchronous and measurement of the kinds of experiments measuring apparatus to cavitating flow, final to realize comprehensively studying the Complex Phenomena in Vertical Bell Jar of this multi- scenarios method of the unsteady process of cavitation.
Description
Technical field
The present invention relates to a kind of many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel, belong to ship with
Submarine navigation device engineering, Hydraulic and Hydro-Power Engineering technical field.
Background technology
In high-velocity flow, when below the reduced pressure at a certain position to saturated vapour pressure, cavitation will be produced existing
As.Cavitating flows along with hole growth, the complicated UNSTEADY FLOW feature such as crumble and fall, this kind of phenomenon can be produced to hydraulic
Many adverse effects, such as surfacing are damaged, and are vibrated and noise, and power loss etc..
In the past few decades, many for the experimentation of cavitation phenomenon, research equipment mainly has High-speed Photography Technology, grain
Sub- velocity measuring technique PIV and LDV LDV laser-induced fluorescence (LIF) LIF and microminiature sensor.These advanced experiment handss
The appearance of section, promotes people to go deep into cavitation phenomenon understanding, and for example, kingdom's jade of Beijing Institute of Technology etc. is respectively adopted height
Fast camera technique and particle velocity measuring technique P IV have studied the hole Form Development process and Cavitation flows around aerofoil profile and revolving body
Dynamic velocity field.Wang Yong of Jiangsu University et al. acquires cavitating flows respectively using High-speed Photography Technology and pressure transducer
The vibration and noise signals of hole form and cavitating flow.
But, these testing equipments are all purpose instruments, are for sports ground tachometric survey, the measurement of pressure field wall pressure stress
Carried out with density field cavity form respectively.Currently in experimentation cavitating flows characteristic, high-speed camera is often individually adopted
Technology is shot to cavitation form or is individually measured using pressure transducer stream field pressure oscillation, is lacked to same
The understanding of relation between the variable of moment difference flow field, it is difficult to the Complex Phenomena in Vertical Bell Jar to this multi- scenarios method of the unsteady process of cavitation
Comprehensively studied.
The content of the invention
The invention aims to solve existing employing single-measurement equipment experimental technique cannot be while obtaining Cavitation flows
A kind of problem of dynamic density field, sports ground and pressure field, there is provided many field synchronizations of unsteady cavitating flows based on circulating water tunnel
Measuring system.
The purpose of the present invention is achieved through the following technical solutions.
The many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel, by experiment porch, particle image velocimetry
Subsystem, pressure measxurement subsystem and synchronous four parts of triggering subsystem constitute.
Experiment porch includes test section, experimental model, transparent organic glass.High speed camera, laser instrument, sheet laser and light path
System, data collecting system；
The experimental model bottom surface is provided with tapped through hole, for installing pressure transducer；The pressure-sensitive face of pressure transducer with
Experimental model upper surface flush；
Particle image velocimetry subsystem includes laser guide arm, laser generator, high speed camera and computer host box and display
Device.By the energy grade for adjusting laser generator so that the laser piece brightness in cavitating flows region reaches the bat of high speed camera
Take the photograph requirement；The high speed camera is needed using rubber vibration isolation cushion and sponge isolation cushion dual isolation measure when installing.
Pressure measxurement subsystem includes pressure transducer, signal conditioner, data collecting card and computer host box and display
Device.
Synchronous triggering subsystem includes synchronous trigger switch.
Laser generator is sent laser and is irradiated on experimental model by laser guide arm；Laser guide arm is occurred with laser successively
Device, computer host box connection；The picture transfer of high speed camera collection is in computer host box；The pressure letter of pressure transducer collection
Number it is transferred in another computer by signal conditioner and data collecting card；Transparent organic glass is installed at the top of test section；
Synchronous trigger switch controls high speed camera and data collecting card simultaneously；
The course of work：First, flow parameter is adjusted, makes in the expansionary channel of circulating water tunnel test section, to produce cavitating flows；
Then particle image velocimetry subsystem and pressure measxurement subsystem are respectively started, particle image velocimetry and pressure measxurement is respectively provided with
Frequency acquisition and acquisition time length；Next, be in particle image velocimetry subsystem and pressure measxurement subsystem etc.
State to be triggered；Afterwards, cavitating flows state is observed from test section transparent organic glass, touch when cavitating flows state is observed
Send out synchro switch；Particle picture information and pressure fluctuation signal are stored respectively to the computer of respective connection.Finally, to many field synchronizations
Gathered data is analyzed, and can terminate experiment after completing above-mentioned steps.
Beneficial effect
1st, many field synchronization measuring systems of the unsteady cavitating flows based on circulating water tunnel of the invention, introduce synchronous triggering skill
Art, various universal measuring devices are combined together, so as to realize Synchronous of the kinds of experiments measuring apparatus to cavitating flow
With measurement, finally realize comprehensively studying the Complex Phenomena in Vertical Bell Jar of this multi- scenarios method of the unsteady process of cavitation.
2nd, many field synchronization measuring systems of the unsteady cavitating flows based on circulating water tunnel of the invention, the sense of pressure transducer
Pressure surface is directly contacted with flow region with experimental model upper surface flush, i.e. pressure transducer, and measurement data is more accurate.
Description of the drawings
Fig. 1 is the schematic diagram of unsteady cavitating flows many field synchronization measuring system of the present invention based on circulating water tunnel；
Fig. 2 is experimental model schematic diagram；
Fig. 3 is the longitudinal sectional drawing that experimental model crosses sensor mounting location；
Fig. 4 is the transverse cross-sectional view that experimental model crosses sensor mounting location；
Fig. 5 is the operational flowchart of unsteady cavitating flows many field synchronization measuring system of the present invention based on circulating water tunnel.
Wherein, 1-laser guide arm, 2-laser piece, 3-transparent organic glass, 4-laser generator, 5-test section,
6-high speed camera, 7-computer host box, 8-display, 9-synchronous trigger switch, 10-pressure transducer, 11-signal are adjusted
Reason device, 12-data collecting card, 13-experimental model.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
The many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel, it is surveyed by experiment porch, particle picture
Fast subsystem, pressure measxurement subsystem and synchronous four parts of triggering subsystem constitute, as shown in Figure 1.
Experiment porch includes test section 5, experimental model 13, transparent organic glass 3.13 bottom surface of the experimental model is provided with spiral shell
Stricture of vagina through hole, for installing pressure transducer 10, the upper surface flush on the right side of the pressure-sensitive face of pressure transducer 10 and experimental model 13,
Wherein experimental model 13, the longitudinal sectional drawing of mistake sensor mounting location and transverse cross-sectional view are respectively such as Fig. 2, Fig. 3 and Fig. 4 institute
Show；
Particle image velocimetry subsystem includes laser guide arm 1, laser generator 4,7 He of high speed camera 6 and computer host box
Display 8.By the energy grade for adjusting laser generator 4 so that 2 brightness of laser piece in cavitating flows region reaches high speed phase
The photographing request of machine 6；The high speed camera is needed using rubber vibration isolation cushion and sponge isolation cushion dual isolation measure when installing.
Pressure measxurement subsystem includes pressure transducer 10, signal conditioner 11, data collecting card 12 and computer host box 7
With display 8.
Synchronous triggering subsystem includes synchronous trigger switch 9.
Laser generator 4 is sent laser and is irradiated on experimental model 13 by laser guide arm 1；Laser guide arm 1 successively with swash
Optical generator 4, computer host box 7 connect；The picture transfer of the collection of high speed camera 6 is in computer host box 7；Pressure transducer 10
The pressure signal of collection is transferred in another computer by signal conditioner 11 and data collecting card 12；Pacify at the top of test section 5
Equipped with transparent organic glass 3；Synchronous trigger switch 9 controls high speed camera 6 and data collecting card 12 simultaneously；
The course of work, as shown in Figure 5：
A. first, it is 5m/s to adjust speed of incoming flow, makes cavitating flows are produced in the expansionary channel of circulating water tunnel test section 5；
B. particle image velocimetry subsystem and pressure measxurement subsystem are respectively started；
C. the frequency acquisition and acquisition time length for being respectively provided with high speed camera 6 and pressure transducer 10 is respectively 3000hz
And 5s；
D. particle image velocimetry subsystem and pressure measxurement subsystem are made in triggering state is waited, is ready to receive same
The control signal of step trigger switch；
E. trigger synchro switch 9 when observing and cavitating flows state being produced in expansionary channel, produce trigger so that
Particle image velocimetry subsystem and pressure measxurement subsystem start simultaneously at gathered data information；
F. the particle image velocimetry information for gathering and pressure fluctuation signal are stored to computer host box 7；
G. many field synchronization gathered datas are observed on the display 8, it can be observed that the density field at a certain moment, velocity field and
Pressure field, and the correlation analysiss between many information are carried out, if necessary to continue measurement, repeat d-g steps；
H. terminate experiment.
Using above-mentioned the measuring method data for measuring and the essence for individually being measured using high speed camera and pressure transducer respectively
Degree be it is the same, but, using synchronous triggering technique, high speed camera and pressure transducer can be controlled and meanwhile collection, obtain
Various information of flow of synchronization, the research for the Complex Phenomena in Vertical Bell Jar of this multi- scenarios method of cavitating flows are provided greatly
It is convenient.
Below only to illustrate technical scheme, one of ordinary skill in the art can be to the technology of the present invention
Scheme is modified or equivalent.All made an amendment within the spirit and principles in the present invention, equivalents, improvement etc.,
Should be included within the scope of the present invention.
Claims (2)
1. many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel, it is characterised in that：By experiment porch, particle
Image speed measurement subsystem, pressure measxurement subsystem and synchronous four parts of triggering subsystem constitute；
Experiment porch includes test section (5), experimental model (13), transparent organic glass (3)；
Particle image velocimetry subsystem includes laser guide arm (1), laser generator (4), high speed camera (6) and computer host box
And display (8) (7)；By the energy grade for adjusting laser generator (4) so that the laser piece (2) in cavitating flows region is bright
Degree reaches the photographing request of high speed camera (6)；The high speed camera is needed using rubber vibration isolation cushion and sponge isolation cushion when installing
Dual isolation measure；
Pressure measxurement subsystem includes pressure transducer (10), signal conditioner (11), data collecting card (12) and host computer
Case (7) and display (8)；
Synchronous triggering subsystem includes synchronous trigger switch (9)；
Laser generator (4) is sent laser and is irradiated on experimental model (13) by laser guide arm (1)；Laser guide arm (1) is successively
It is connected with laser generator (4), computer host box (7)；The picture transfer that high speed camera (6) is gathered is in computer host box (7)；
The pressure signal that pressure transducer (10) is gathered is transferred to another electricity by signal conditioner (11) and data collecting card (12)
In brain；Transparent organic glass (3) is installed at the top of test section (5)；Synchronous trigger switch (9) at the same control high speed camera (6) with
Data collecting card (12)；
Experimental model (13) bottom surface is provided with tapped through hole, for installing pressure transducer (10)；Pressure transducer (10)
Pressure-sensitive face and experimental model (13) upper surface flush.
2. many field synchronization measuring systems of unsteady cavitating flows based on circulating water tunnel as claimed in claim 1, its feature exist
In：The course of work：First, flow parameter is adjusted, makes in the expansionary channel of circulating water tunnel test section, to produce cavitating flows；Then divide
Not Qi Dong particle image velocimetry subsystem and pressure measxurement subsystem, be respectively provided with particle image velocimetry and tonometric collection
Frequency and acquisition time length；Next, make particle image velocimetry subsystem and pressure measxurement subsystem in etc. it is to be triggered
State；Afterwards, cavitating flows state is observed from test section transparent organic glass, when cavitating flows state is observed, triggering is synchronous
Switch；Particle picture information and pressure fluctuation signal are stored respectively to the computer of respective connection；Finally, number is gathered to many field synchronizations
According to being analyzed, experiment after completing above-mentioned steps, can be terminated.
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| CN203894026U (en) * | 2014-05-09 | 2014-10-22 | 北京理工大学 | Gas flow rule testing apparatus in cavitation |
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| CN111879493A (en) * | 2020-07-15 | 2020-11-03 | 清华大学 | Flow field data measuring device, measuring method and measurement control system |
| CN111879493B (en) * | 2020-07-15 | 2021-06-08 | 清华大学 | Flow field data measuring method and measurement control system |
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