CN104316291B - Flow field and apparatus for measuring concentration and measuring method based on the mixing liquid of PIV - Google Patents
Flow field and apparatus for measuring concentration and measuring method based on the mixing liquid of PIV Download PDFInfo
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- CN104316291B CN104316291B CN201410525339.3A CN201410525339A CN104316291B CN 104316291 B CN104316291 B CN 104316291B CN 201410525339 A CN201410525339 A CN 201410525339A CN 104316291 B CN104316291 B CN 104316291B
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Abstract
The invention belongs to fluid measurement technical field, flow field and the apparatus for measuring concentration and using the measurement device flow field or the method for concentration of a kind of fluid-mixing based on PIV are disclosed.The measurement apparatus include main water box, experimental box body, surge tank, storage tank and PIV systems；Main water box is divided into A areas casing and B areas casing, provides mixed pipe line liquid and main line liquid respectively, and liquid mixes in experimental box body, carries out the measurement of flow field or concentration by PIV systems.Water cloth in main water box and surge tank spreads trace particle, the flow field of mixing liquid can be measured by PIV systems；Add fluorescent particles respectively in two casings of main water box and prepare variable concentrations, the concentration of mixing liquid can be measured with reference to LIF systems by PIV systems.Measurement apparatus of the present invention can realize the measurement for carrying out mixing flow field and melting concn in the same apparatus, can both save water and trace particle, can carry out real-time detection with stream field and concentration again.
Description
Technical field
The invention belongs to fluid measurement technical field, and in particular to a kind of flow field of fluid-mixing based on PIV and concentration
Measurement apparatus, and using the measurement device flow field or the method for concentration.
Background technology
At present, the method for measuring liquid flow field has：(1) pibtot's tub velocimetry, using pibtot's tub according to law of conservation of energy
The advantages of measuring speed, with simple structure, easy to use, certainty of measurement height, good stability；(2) hot line/hotting mask velocimetry,
The average speed and fluctuation velocity of fluid are measured using heat balance principle, frequency response width little with inertia, sensitivity are high,
Stream field disturbs little advantage；(3) LDV (Laser Doppler Velocity) laser-Dopplers and correlation technique, application are more
General Le effect, is measured fluid or solid velocity using the high coherence and high-energy of laser, is surveyed with noncontact with linear characteristic
The advantage of amount；(4) PIV (Particle Image Velocimetry) technology, it is also known as particle image velocimetry method, non-as one kind
The measuring method of contact, can record whole flow field for information about in synchronization, the precision for possessing single point measuring technique
And resolution, overall structure and transient images that Plane Fluid Field shows can be obtained again.At present using the ratio in PIV commercial measurements flow field
It is more, but there is stronger specific aim, a kind of such as turbomachine interior flow field measurement of BJ University of Aeronautics ＆ Astronautics's invention
Method, is specifically designed for the measurement of turbomachine interior flow field, Patent No. CN1700019A；In the refined doctor of Zhejiang University's stone favour
In paper " recirculating fluidized bed flow behavior PIV is tested and numerical simulation ", using the PIV systems for voluntarily building to recirculating fluidized bed
Cold flow field has carried out experimental study, obtains gas solid two phase flow characteristics under different operating modes；Christian Drumm and Mark
W discloses a kind of numerical simulation and PIV measuring methods of industrial ratio rotary-disk contactor in AIChE Journal, employs
By CaCl2With the light-sensitive system of the sucker of water composition, industrial ratio rotary-disk contactor is measured using biphase PIV measuring methods
Local turbulence dissipative shock wave.
In addition, the method for having a variety of measurement solution concentrations both at home and abroad.Conventional several measurement concentration methods have following several
Kind：(1) titrimetry, obtains the concentration of solution by chemico-analytic method；(2) proportion measures concentration method, is measured by proportion
The density of amount solution, is then obtained the concentration of solution, is a kind of method of indirect measurement using the method for conversion；(3) refractometer
Method, measures liquid refractivity according to the law of refraction of light, then further tries to achieve strength of fluid by refractive index, and the method is simple and direct, accurate
Exactness is higher；(4) ultrasonic Method for Measuring, has close relationship using the spread speed of sound wave in solution and the concentration of solvent, surveys
The velocity of sound of amount ultrasound wave, and according to the velocity of sound and the relation of concentration, measure the concentration of solution.In addition to above-mentioned method, may be used also
LIF (Laser Induce Fluorescene, laser-induced fluorescence (LIF)) technologies are combined using PIV systems measure mixing liquid
Concentration, the method it is critical only that capture fluorescence and filter out the exciting light for being referred to as " noise source ", using not high in concentration
When, the theory that light absorbs phenomenon is very weak and local concentration is determined by fluorescence is launched, using equation below：
Known according to formula, the concentration for measuring solution is directly proportional to the intensity of fluorescence, so as to the intensity according to fluorescence is direct
Obtain the concentration of solution.At present PIV systems combine the measuring method of LIF technologies and mainly report relatively more abroad, but have stronger
Specific aim.Such as：Tokyo institute of oceanography Atsuhide Kitagawa using PIV and LIF commercial measurements vertical tube and
The turbulence structure of microbubble in horizontal channel；A.Fujiwara is in periodical《Experiments in Fluids》In disclose and adopt
With the measuring method of bubble deformation in the fluidal texture and two-dimensional space near PIV and LIF technical research one-dimensional space bubbles.And
It is fewer with reference to the report of LIF commercial measurement concentration using PIV systems at home.
There is presently no to see and the correlation that flow field can measure the device and method of concentration again can be measured based on PIV technologies
Report
The content of the invention
In order to overcome the shortcoming of prior art and deficiency, the primary and foremost purpose of the present invention is to provide a kind of based on the mixed of PIV
Flow field and the apparatus for measuring concentration of liquid are closed, plurality of liquid can both have been realized by the device mixed in diverse location with different flow
The flow field survey of conjunction, can realize mixing liquid again and carried out in diverse location with different flow and different initial concentrations and be mixed
Measurement of concetration；
Another object of the present invention is to provide flow field and the apparatus for measuring concentration using the above-mentioned mixing liquid based on PIV
Measurement mixing liquid flow field method；
It is still another object of the present invention to provide using flow field and the apparatus for measuring concentration of the above-mentioned mixing liquid based on PIV
Measurement mixing liquid concentration method.
The purpose of the present invention is achieved through the following technical solutions：
A kind of flow field of mixing liquid based on PIV and apparatus for measuring concentration, including main water box, experimental box body, surge tank,
Storage tank and PIV systems；
Wherein, main water box is split up into A areas casing by dividing plate and B areas casing is constituted；A areas casing is sequentially connected by pipeline
One water pump, mixed pipe line valve, first flowmeter, surge tank and experimental box body；B areas casing is sequentially connected the second water by pipeline
Pump, main line valve, second flowmeter and experimental box body；
Experimental box body is connected by pipeline with storage tank；
Storage tank outlet pipeline is divided into two-way, respectively circulation line and discharge pipe line；Circulation line is provided with the first valve
Door, circulation line are communicated to main water box；Discharge pipe line is provided with the second valve, and discharge pipe line is to outside discharge；
The PIV systems include laser generator, CCD camera, lock unit, microcomputer and LIF modules；
Further scheme is that B areas casing is communicated to the front end position that the import of the pipeline of experimental box body 2 is located at experimental box body 2
Put；
Further scheme is that the dividing plate of the main water box is provided with switchable intercommunicating pore；The intercommunicating pore can be according to survey
The needs of amount purpose select to open or close, and when bore closure is connected, A areas casing is not connected with B areas casing, can deposit difference
Liquid；When intercommunicating pore is opened, A areas casing is connected with B areas casing, can carry out the mixing of liquid；
Further scheme is that the surge tank arranges multiple outlets, and the arm of respective amount is arranged on the experimental box body
Import, each outlet of surge tank are connected with the arm import on the experimental box body by bye-pass respectively, and each bye-pass is all
Valve is set；
Further scheme is that each arm inlets even horizontal distribution of the experimental box body is arranged on the side of experimental box body
Wall；
The quantity of experimental box body arm import, selects according to measurement requirement, and 3～10 arm imports may be selected；By
Experimental box body arranges different arm imports, with reference to the switch of each bye-pass, so as to realize experimental box body diverse location and with
Different flow injects the control of liquid, and can coordinate carries out the flow field survey or measurement of concetration of mixing liquid；
Further scheme is that first water pump arranges frequency-changing control system, and second water pump is provided with VFC
System；
By frequency-changing control system, the flow of the first water pump and the second water pump is can control, to control to flow into experimental box body
Fluid flow；
Further scheme is that the experimental box body is made using visual optical material；Further scheme is, the reality
Tryoff body is made using pmma material；
Using visual optical material, the measurement demand of PIV systems can be met；
Further scheme is that the outlet conduit of the storage tank arranges the 3rd water pump；The effect of the 3rd water pump is set, be for
In the case of discharge pressure deficiency, discharge pressure is lifted, water outlet is delivered to outside main water box or discharger.
Using the side in the flow field in the flow field and apparatus for measuring concentration measurement mixing liquid of the above-mentioned mixing liquid based on PIV
Method, comprises the steps：
(1) the A areas casing and B areas casing in main water box injects measurement liquid, then uniformly dispenses trace particle respectively；Institute
State the density of trace particle and the consistent in density of measurement liquid；
(2) shooting visual angle is chosen beside experimental box body, the laser generator of PIV systems is placed on into the bottom of experimental box body
CCD camera is placed on the side of experimental box body by portion, and relative position is in 90 degree, using single-pass channel filter；
(3) open the second water pump and the measurement liquid with trace particle in B areas casing is transported to into experimental box body；Open the
Measurement liquid with trace particle in A areas casing is transported to surge tank by one water pump；
(4) by the keying of control surge tank difference bye-pass valve, the measurement liquid of A areas casing is input to into experimental box
In body, mixed with the measurement liquid of the B areas casing of injection, formed mixing liquid；PIV systems are opened, in experimental box body
The flow field portion of measurement is needed to be demarcated, adjusting parameter arranges to obtain clearly flow field figure picture；When with trace particle
During liquid flows through experimental box body, its flow field is shot, and gathered data, gathered data is analyzed, is obtained
The data parameters in the flow field of mixing liquid；
By the keying for controlling surge tank difference bye-pass valve, the measurement liquid of diverse location and different flow is obtained
The flow field of mixing；
The data parameters in the flow field of the mixing liquid include velocity, vorticity and tubulence energy；
(5) mixing liquid flowed out from experimental box body is entered in storage tank, opens the first valve, closes the second valve, will
Mixing liquid in storage tank is delivered in main water box, is injected into A areas casing and B areas casing；It is transmitted back to the mixed liquor of main water box
Body, the operation for carrying out above-mentioned measurement flow field capable of circulation.
Using the side of the concentration in the flow field and apparatus for measuring concentration measurement mixing liquid of the above-mentioned mixing liquid based on PIV
Method, comprises the steps：
(1) the A areas casing and B areas casing in main water box is injected separately into the measurement liquid of variable concentrations, is then respectively adding
Fluorescent particles；
The fluorescent particles, be
(2) shooting visual angle is chosen beside experimental box body, the laser generator of PIV systems is placed on into the bottom of experimental box body
CCD camera is placed on the side of experimental box body by portion, and relative position is in 90 degree, using colored filter；
(3) open the second water pump and the measurement liquid with fluorescent particles in B areas casing is transported to into experimental box body；Open the
Measurement liquid with fluorescent particles in A areas casing is transported to surge tank by one water pump；
(4) by the keying of control surge tank difference bye-pass valve, the measurement liquid of A areas casing is input to into experimental box
In body, mixed with the measurement liquid of the B areas casing of injection, formed mixing liquid；PIV systems are opened, in experimental box body
The Mixed Zone of measurement is needed to be demarcated, adjusting parameter arranges to obtain clearly image；When the liquid containing fluorescent particles
During flowing through experimental box body, its melting concn is shot, and gathered data, gathered data is analyzed, is obtained
The melting concn law curve of mixing liquid；
By the keying for controlling surge tank difference bye-pass valve, the measurement liquid of diverse location and different flow is obtained
Melting concn change；
(5) mixing liquid flowed out from experimental box body is entered in storage tank, opens the second valve, closes the first valve, will
Mixing liquid in storage tank is discharged.
Using measurement apparatus of the present invention, overcome in terms of flow field survey spot measurement, stream field have interference,
Transient flow field can not be measured, it is impossible to obtain the defects such as whole flow field；Indirect measurement, accuracy are overcome in terms of measurement concentration not
It is enough, it is impossible to measure transient state concentration, it is impossible to obtain the defects such as the concentration in whole flow field；The present invention has advantages below：
(1) measurement apparatus of the present invention can measure the flow field of mixing liquid, can measure the concentration of mixing liquid again, tool
There are amalgamation and multifunctionality.
(2) measurement apparatus of the present invention have motility, thus it is possible to vary flow, position, concentration, so as to realize various streams
Field and the measurement of various concentration.
(3) measurement apparatus of the present invention can realize measurement in real time, can move the position of PIV systems, realize different
The measurement of the melting concn and mixing liquid of position.
Description of the drawings
Fig. 1 is the structural representation of the flow field of the mixing liquid based on PIV of the present invention and apparatus for measuring concentration.
Fig. 2 is surge tank and experimental box in the flow field of the mixing liquid based on PIV of the present invention and apparatus for measuring concentration
The connection diagram of the branched pipeline of body.
Fig. 3 is the schematic diagram in the part flow field of measurement gained mixing liquid.
Fig. 4 is the concentration curve schematic diagram of the experimental box body mixing liquid of the measurement of embodiment 3.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
Embodiment 1
A kind of flow field of mixing liquid based on PIV and apparatus for measuring concentration, including main water box 1, experimental box body 2, buffering
Tank 3, storage tank 4 and PIV systems 5；The flow field of the mixing liquid based on PIV and the structural representation of apparatus for measuring concentration are such as
Shown in Fig. 1.
Wherein, main water box 1 is split up into A areas casing by dividing plate and B areas casing is constituted；A areas casing is sequentially connected by pipeline
First water pump 101, mixed pipe line valve 102, first flowmeter 103, surge tank 3 and experimental box body 2；B areas casing passes through pipeline
It is sequentially connected the second water pump 104, main line valve 105, second flowmeter 106 and experimental box body 2；
Experimental box body 2 is connected by pipeline with storage tank 4；
4 outlet pipeline of storage tank is divided into two-way, respectively circulation line and discharge pipe line；Circulation line is provided with the first valve
Door 401, circulation line is communicated to main water box 1；Discharge pipe line is provided with the second valve 402, and discharge pipe line is to outside discharge；
PIV systems 5 include laser generator 501, CCD camera 502, lock unit 503, microcomputer 504 and LIF modules
505；
Further scheme is that B areas casing is communicated to the front end position that the import of the pipeline of experimental box body 2 is located at experimental box body 2
Put；
Further scheme is that the dividing plate of the main water box 1 is provided with switchable intercommunicating pore；The intercommunicating pore can be according to survey
The needs of amount purpose select to open or close, and when bore closure is connected, A areas casing is not connected with B areas casing, can deposit difference
Liquid；When intercommunicating pore is opened, A areas casing is connected with B areas casing, can carry out the mixing of liquid；
Further scheme is that the surge tank 3 arranges multiple outlets, and propping up for respective amount is arranged on the experimental box body 2
Pipe import, each outlet of surge tank 3 are connected with the arm import on the experimental box body 2 by bye-pass respectively, each arm
Road all arranges valve；
Further scheme is that each arm inlets even horizontal distribution of the experimental box body 2 is arranged on experimental box body 2
Side wall；
The quantity of 2 branch road import of experimental box body, selects according to measurement requirement, and 3～10 branch road imports may be selected；By
Experimental box body 2 arranges different branch road imports, with reference to the switch of each bye-pass, so as to realizing experimental box body 2 in diverse location and
The control of liquid is injected with different flow, can coordinate carries out the flow field survey or measurement of concetration of mixing liquid；
Further scheme is that first water pump 101 arranges frequency-changing control system, and second water pump 104 is provided with change
Frequency control system；
By frequency-changing control system, the flow of the first water pump 101 and the second water pump 104 is can control, to control to flow into experiment
The fluid flow of casing 2；
Further scheme is that the experimental box body 2 is made using visual optical material；Further scheme is, the reality
Tryoff body 2 is made using PMMA pmma materials；Using visual optical material, the measurement demand of PIV systems can be met；
Further scheme is that the outlet conduit of the storage tank 4 arranges the 3rd water pump 403；The effect of the 3rd water pump is set,
Be in order to discharge pressure deficiency in the case of, lifted discharge pressure, water outlet is delivered to outside main water box or discharger.
Embodiment 2
Using flow field and the stream of apparatus for measuring concentration measurement mixing liquid of the mixing liquid based on PIV of the present invention
.
The flow field of the mixing liquid based on PIV and apparatus for measuring concentration as described in Example 1, concrete unit type and
Parameter is as follows：
First water pump 101 selects centrifugal pump, and model IS50-32-200B, lift are 37.5 meters, and flow is 10.8m3/h；
Second water pump 104 selects centrifugal pump, and model ISW80-200A, lift are 44 meters, and flow is 47m3/h；3rd water pump 403 is selected
With centrifugal pump, model IS80-65-125, lift are 20 meters, and flow is 50m3/h；First flowmeter 103 is spinner flowmeter,
Range is 20m3/h；103 model LDG-105-050 of second flowmeter, range is 47m3/h；A areas casing is to experimental box body 2
The caliber of pipeline is nominal diameter DN32；The caliber nominal diameter of B areas casing to the main line of experimental box body 2 is DN80；Water storage
The caliber of case 4 to the circulation line of main water box 1 is nominal diameter DN65；PIV systems 5 are Hong Kong Marketec Technology Co., Ltd.
Product, LIF modules 505 for DynamicStudio companies LIF modules, model 80S85；
The concrete operations in flow field of measurement mixing liquid are：
(1) in the A areas casing and B areas casing injected clear water of main water box 1, polyamide spike grain is then uniformly dispensed respectively
Son；The density of the polyamide trace particle is 1.0 × 103kg/m3, it is identical with the density of clear water, a diameter of 50 μm；
(2) shooting visual angle is chosen beside experimental box body, the laser generator 501 of PIV systems 5 is placed on into experimental box body
CCD camera 502 is placed on the side of experimental box body 2 by 2 bottom, and relative position is in 90 degree, using single-pass channel filter；
(3) open the second water pump 104 and the liquid with polyamide trace particle in B areas casing be transported to into experimental box body 2,
B areas casing is communicated to the front position that the import of the pipeline of experimental box body 2 is located at experimental box body 2；The first water pump 101 is opened by A
In area's casing, the liquid with polyamide trace particle is transported to surge tank 3；With reference to first flowmeter 103 and second flowmeter
106, VFC is carried out by frequency-changing control system to the first water pump and the second water pump respectively and adjusts output flow, by the first water
The output flow of pump is transferred to 5m3The output flow of the second water pump is transferred to 35m by/h3/h；
(4) there are 7 bye-pass connections between surge tank 3 and experimental box body 2, every bye-pass is provided with 1 valve, and connection is shown
It is intended to as shown in Fig. 2 bye-pass import level in experimental box body 2 is to uniform arrangement, wherein the import of the 4th bye-pass is occupied
In the middle section position of experimental box body；The valve of most middle bye-pass (i.e. four piece bye-pass), remaining arm are opened first only
Road valve closing, measures the flow field change of the mixing liquid after the centre position injection liquid of experimental box body 2；
PIV systems are opened, to needing the flow field portion for measuring to demarcate in experimental box body, the pixel and two of measurement is adjusted
The parameter settings such as the aperture of time interval and CCD camera of frame photograph are obtaining clearly flow field figure picture；When with spike grain
During the liquid of son flows through experimental box body 2, its flow field is shot, and gathered by the data collecting card of PIV systems 5
Data；Gathered data is analyzed using the Dynamic Studio softwares of microcomputer in PIV systems, so as to be mixed
Close the parameters such as velocity, vorticity and the tubulence energy in the flow field of liquid；The part flow field schematic diagram of measurement gained is as shown in Figure 3；
According to measurement purpose, the valve of remaining bye-pass is opened and closed respectively, repeat the step operation, to measure in experimental box body
Flow field change after 2 other positions injection liquid,
(6) mixing liquid flowed out from experimental box body is entered in storage tank, opens the first valve, closes the second valve, will
Mixing liquid in storage tank is delivered in main water box, is injected into A areas casing and B areas casing；It is transmitted back to the mixed liquor of main water box
Body, the operation for carrying out above-mentioned measurement flow field capable of circulation.
Embodiment 3
Using the mixing liquid based on PIV of the present invention flow field and apparatus for measuring concentration measure 0.3% paper pulp and
1% paper pulp carries out mixed concentration rule.
The flow field of the mixing liquid based on PIV and apparatus for measuring concentration as described in Example 1, concrete unit type and
Parameter is as follows：
First water pump 101 selects centrifugal pump, and model IS50-32-200B, lift are 37.5 meters, and flow is 10.8m3/h；
Second water pump 104 selects centrifugal pump, and model ISW80-200A, lift are 44 meters, and flow is 47m3/h；3rd water pump 403 is selected
With centrifugal pump, model IS80-65-125, lift are 20 meters, and flow is 50m3/h；First flowmeter 103 is spinner flowmeter,
Range is 20m3/h；103 model LDG-105-050 of second flowmeter, range is 47m3/h；A areas casing is to experimental box body 2
The caliber of pipeline is nominal diameter DN32；The caliber nominal diameter of B areas casing to the main line of experimental box body 2 is DN80；Water storage
The caliber of case 4 to the circulation line of main water box 1 is nominal diameter DN65；PIV systems 5 are Hong Kong Marketec Technology Co., Ltd.
Product, LIF modules 505 for DynamicStudio companies LIF modules, model 80S85；
The concrete operations of concentration rule of measurement mixed pulp are：
(1) in the A areas casing and B areas casing injected clear water of main water box 1, then uniform allotment fluorescent agent rhodamine is molten respectively
Liquid, the rhodamine liquor of proportioning 0.3% in A areas casing, the rhodamine liquor of proportioning 1.0% in B areas casing；
(2) shooting visual angle is chosen beside experimental box body, the laser generator 501 of PIV systems 5 is placed on into experimental box body
CCD camera 502 is placed on the side of experimental box body 2 by 2 bottom, and relative position is in 90 degree, using colored filter；
(3) open the second water pump 104 and in B areas casing 1% rhodamine liquor is transported to into experimental box body 2, B areas casing connects
The import for passing to the pipeline of experimental box body 2 is located at the front-end position of experimental box body 2；The first water pump 101 is opened by A areas casing
0.3% rhodamine liquor is transported to surge tank 3；With reference to first flowmeter 103 and second flowmeter 106, respectively by frequency conversion
Control system carries out VFC and adjusts output flow to the first water pump and the second water pump, and the output flow of the first water pump is transferred to
5m3The output flow of the second water pump is transferred to 35m by/h3/h；
(4) there are 7 bye-pass connections between surge tank 3 and experimental box body 2, every bye-pass is provided with 1 valve, and connection is shown
It is intended to as shown in Fig. 2 bye-pass import level in experimental box body 2 is to uniform arrangement, wherein the import of the 4th bye-pass is occupied
In the middle section position of experimental box body；The valve of most middle bye-pass (i.e. four piece bye-pass), remaining arm are opened first only
Road valve closing, measures the melting concn change after the centre position injection liquid of experimental box body 2；
PIV systems are opened, to needing the Mixed Zone for measuring to demarcate in experimental box body, the pixel and two of measurement is adjusted
The parameter settings such as the aperture of time interval and CCD camera of frame photograph are obtaining clearly image；When the liquid containing rhodamine
During body flows through experimental box body, its melting concn is shot, and number is gathered by the data collecting card of PIV systems 5
According to；Gathered data is analyzed using the DynamicStudio softwares of microcomputer in PIV systems, so as to be mixed
The law curve of the melting concn of liquid；The concentration curve schematic diagram of the experimental box body 2 of measurement is as shown in Figure 4；
According to measurement purpose, the valve of remaining bye-pass is opened and closed respectively, repeat the step operation, to measure in experimental box body
Melting concn change after 2 other positions injection liquid；
(6) mixing liquid flowed out from experimental box body 2 is entered in storage tank 4, opens the second valve, closes the first valve,
Mixing liquid in storage tank is discharged.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by above-described embodiment
Limit, other any spirit without departing from the present invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. the method that a kind of flow field of mixing liquid using based on PIV and apparatus for measuring concentration measure the concentration of mixing liquid,
It is characterized in that：
The flow field of the mixing liquid based on PIV and apparatus for measuring concentration include main water box, experimental box body, surge tank, water storage
Case and PIV systems；Main water box is split up into A areas casing by dividing plate and B areas casing is constituted；A areas casing is sequentially connected by pipeline
One water pump, mixed pipe line valve, first flowmeter, surge tank and experimental box body；B areas casing is sequentially connected the second water by pipeline
Pump, main line valve, second flowmeter and experimental box body；Experimental box body is connected by pipeline with storage tank；Storage tank outlet pipe
Road is divided into two-way, respectively circulation line and discharge pipe line；Circulation line is provided with the first valve, and circulation line is communicated to main water
Case；Discharge pipe line is provided with the second valve, and discharge pipe line is to outside discharge；
The method of the concentration of the measurement mixing liquid comprises the steps：
(1) the A areas casing and B areas casing in main water box is injected separately into the measurement liquid of variable concentrations, is then respectively adding fluorescence
Particle；
(2) shooting visual angle is chosen beside experimental box body, the laser generator of PIV systems is placed on into the bottom of experimental box body,
CCD camera is placed on into the side of experimental box body, relative position is in 90 degree, using colored filter；
(3) open the second water pump and the measurement liquid with fluorescent particles in B areas casing is transported to into experimental box body；Open the first water
Measurement liquid with fluorescent particles in A areas casing is transported to surge tank by pump；
(4) by the keying of control surge tank difference bye-pass valve, the measurement liquid of A areas casing is input to into experimental box body
In, mixed with the measurement liquid of the B areas casing of injection, formed mixing liquid；PIV systems are opened, to needing in experimental box body
Mixed Zone to be measured is demarcated, and adjusting parameter arranges to obtain clearly image；When the liquid flow containing fluorescent particles
During Jing experimental box bodies, its melting concn is shot, and gathered data, gathered data is analyzed, is mixed
Close the melting concn law curve of liquid；
(5) mixing liquid flowed out from experimental box body is entered in storage tank, opens the second valve, closes the first valve, by water storage
Mixing liquid in case is discharged.
2. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：The PIV systems include laser generator, CCD camera, lock unit, microcomputer
Calculation machine and LIF modules.
3. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：B areas casing is communicated to the import of the pipeline of experimental box body 2 and is located at experimental box body 2
Front position.
4. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：The dividing plate of the main water box is provided with switchable intercommunicating pore.
5. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：The surge tank arranges multiple outlets, and correspondence number is arranged on the experimental box body
The arm import of amount, each outlet of surge tank are connected with the arm import on the experimental box body by bye-pass respectively, respectively
Bye-pass all arranges valve.
6. a kind of flow field of mixing liquid using based on PIV according to claim 5 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：Each arm inlets even horizontal distribution of the experimental box body, is arranged on experiment
The side wall of casing.
7. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：First water pump arranges frequency-changing control system, and second water pump is provided with
Frequency-changing control system.
8. a kind of flow field of mixing liquid using based on PIV according to claim 1 and apparatus for measuring concentration measurement are mixed
The method for closing the concentration of liquid, it is characterised in that：The experimental box body is made using visual optical material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410525339.3A CN104316291B (en) | 2014-10-08 | 2014-10-08 | Flow field and apparatus for measuring concentration and measuring method based on the mixing liquid of PIV |
Applications Claiming Priority (1)
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