CN110068523A - A kind of polymer flow drag reduction evaluating apparatus and method - Google Patents
A kind of polymer flow drag reduction evaluating apparatus and method Download PDFInfo
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- CN110068523A CN110068523A CN201910382992.1A CN201910382992A CN110068523A CN 110068523 A CN110068523 A CN 110068523A CN 201910382992 A CN201910382992 A CN 201910382992A CN 110068523 A CN110068523 A CN 110068523A
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Abstract
This specification embodiment discloses a kind of polymer flow drag reduction evaluating apparatus and method, described device includes stirring sub-device and test subsystems, wherein, the stirring sub-device includes the first container and blender for installing test liquid, the blender includes agitating shaft and the agitator arm that is fixed on agitating shaft, and the agitator arm is for being stirred the test liquid in the first container；The test subsystems include laser beam emitting device, image collecting device, synchronizer and processor, and the processor controls the laser beam emitting device by the synchronizer, image collecting device works；The laser beam emitting device is used for the first container emission pulse laser light beam；Described image acquisition device is used to shoot the liquid flow field image under blender stirring in the first container, and sends the liquid flow field image to the processor；The processor obtains test liquid information of flow for handling the liquid flow field image.
Description
Technical field
The present invention relates to turbulent flow drag reduction technical fields, particularly, are related to a kind of polymer flow drag reduction evaluating apparatus and side
Method.
Background technique
Drag reduction is a kind of engineering intervention, it is possible to reduce or minimize the frictional resistance pressure drop in current system.Pipeline is built up
After, since Various Seasonal oil product viscosity is different, user is also different to the demand of oil product, pipeline actual throughput and design throughput
It is extremely difficult to consistent.Especially in the middle and later periods of oil field development, pipeline slowly aging, bearing capacity is gradually reduced, and user couple
The demand of oil product increases year by year, and too small design caliber is no longer satisfied the requirement of current throughput rate.In order to make pipeline
Throughput rate has certain regulating power, and addition drag reducer is a kind of common method for guaranteeing throughput rate in engineering, can substantially reduce defeated
Oily cost.Pipeline drag reducer can be divided into five classes: polymer, surfactant, fiber, microbubble and compliant coatings and table
Face activating agent is compared with fiber, and polymer volume is considerably less, so in the industry, polymer drag reducer is very widely used.
Experiment and theoretical research prove that drag reducer can only play drag reduction effect in turbulent flow, and can change flow field turbulent flow
Flow behavior.Therefore influence of the Study Polymer Melts to turbulent flow parameter can be used as evaluation polymer drag reducer drag-reduction effect
A kind of mode.Currently used drag reducer evaluating device has Simulative Loop, rotating circular disk device, rotational rheometer etc..
It is smaller that indoor circuit evaluates the corresponding usual caliber of interior conduit, reaches turbulent flow fluidised form and needs higher flow velocity, together
When lesser caliber cause the shear rate of tube wall to be greater than the pipe stream shear rate of industrial pipeline.Meanwhile it being evaluated using the device
It usually requires when a kind of one concentration of drag reducer compared with rotating circular disk, rheometer etc., it is larger to consume liquid measure, comes especially for oil product
It says, if you need to evaluate a variety of drag reducers and a variety of concentration conditions, then economy is bad.Meanwhile indoor circuit evaluation drag reducer is also deposited
Complicated for operation, the not easy cleaning the problems such as.
Rotating circular disk device usually passes through the measurement pure solvent of the rotating circular disk device in hydrostatic column and containing a certain concentration
Drag reduction by polymer agent solution plate change in torque evaluate drag-reduction effect, experimental result by torque measurement precision and sensor spirit
Quick property is affected.Simultaneously as test space fluid is seldom, experimental result is frequently subjected to the influence of other uncertain factors.
In addition, in order to reach turbulent flow fluidised form, it usually needs it is tested under the conditions of higher rotation speed, and under this condition, the stabilization of test macro
Property is difficult to ensure.
Rotational rheometer is frequently utilized for the resistance reducing performance of evaluation water-soluble polymer such as PEO, PAM, passes through measurement plus agent body
It is the Stress calculation coefficient of friction resistance to calculate drag reducing efficiency, cylindrical systems or double gap system can be used.Due to gap very little, so
It is generally necessary to which very high revolving speed gets to turbulence state, under high revolving speed, the stability of measuring instrument is difficult to be guaranteed, especially
It is the oil-soluble polymers drag reduction agent solution for low concentration, is usually unable to get apparent measurement result.
Therefore, the art needs a kind of polymer drag reducer evaluating apparatus for having both stability and economy.
Summary of the invention
This specification embodiment is designed to provide a kind of polymer flow drag reduction evaluating apparatus and method, can be improved
The accuracy of test result, and test process is more economically efficient.
This specification provides a kind of polymer flow drag reduction evaluating apparatus and method includes under type realization such as:
A kind of polymer flow drag reduction evaluating apparatus, described device include stirring sub-device and test subsystems, wherein
The stirring sub-device includes the first container and blender for installing test liquid, and the blender includes stirring
The agitator arm mixing axis and being fixed on agitating shaft, the agitator arm is for stirring the test liquid in the first container
It mixes；
The test subsystems include laser beam emitting device, image collecting device, synchronizer and processor, the processor
The laser beam emitting device is controlled by the synchronizer, image collecting device works；
The laser beam emitting device is used for the first container emission pulse laser light beam；
Described image acquisition device is used to shoot the liquid flow field image under blender stirring in the first container, and will
The liquid flow field image sends the processor to；
The processor obtains test liquid information of flow for handling the liquid flow field image.
In another embodiment for the described device that this specification provides,
Described device further includes shaft encoder, and the shaft encoder is fixed on the agitating shaft, and passes through the synchronization
Device is connected with the processor, and the shaft encoder is used to obtain the real-time stirring phase of blender, and passes through the synchronizer
Give the real-time stirring transmission of phase to the processor；
Correspondingly, the processor is also used to fill by the synchronizer to the Laser emission under default stirring phase
It sets and image collecting device sends synchronization signal, to trigger the laser beam emitting device and image collecting device work.
In another embodiment for the described device that this specification provides, described device further includes second container, and described the
One container is set in the second container, and intermediate flow is housed in the gap between the first container and the second container
Body, for eliminating the locally reflective influence of the first container curvature bring.
In another embodiment for the described device that this specification provides, described device further includes adjustable fixed branch
Frame, the fixed bracket are used to fix the blender, and control agitator arm is located at the position in the first container.
In another embodiment for the described device that this specification provides, the agitator arm is six leaf Rushton impellers.
In another embodiment for the described device that this specification provides, the revolving speed of the agitator arm be 200-600 turn/
Minute.
This specification provide described device another embodiment in, be equipped in described image acquisition device with it is described
The identical optical filter of laser wavelength of laser beam emitting device transmitting.
On the other hand, this specification embodiment also provides a kind of polymerization based on any one above-mentioned embodiment described device
Object Drag Reduction evaluation method, which comprises
Test liquid is added into the first container, and a certain amount of tracer ion is added；
Laser beam emitting device and blender are opened, the laser beam emitting device holds to described first under the control of a processor
Device emits laser beam；
Image collecting device shoots the flow field image of the test liquid under the control of the processor, and by the stream
Field picture is transmitted to the processor；
The processor is analyzed and processed the flow field image, obtains the flow field velocity vector letter of the test liquid
Breath.
In another embodiment of the method that this specification provides, the method also includes:
Shaft encoder obtains the real-time stirring phase of blender, and the real-time stirring phase is transmitted to by synchronizer
Processor；
The processor is according to the real-time stirring phase controlling laser beam emitting device and image collecting device work received
Make, to obtain the flow field velocity Vector Message under default stirring phase.
In another embodiment of the method that this specification provides, the method also includes:
Turbulent Flow Field supplemental characteristic is calculated according to the flow field velocity Vector Message；
According to different mixings time and/or add the corresponding Turbulent Flow Field supplemental characteristic of agent condition comparison result, determine
The function and effect of drag reducer.
The polymer flow drag reduction evaluating apparatus and method that this specification one or more embodiment provides, can pass through grain
The information of flow that sub- imaging test system and blender combine to test test liquid under the conditions of different plus agent, and then pass through
Analysis adds agent front and back characteristic parameter of the flow field to evaluate influence of the polymer drag reducer to current system.What specification embodiment provided
Device, can make in test process to test liquid under lower speed of agitator and reach turbulence state, to ensure that test macro
Whole stability, improves the accuracy of test result.Meanwhile the device that this specification embodiment provides also has consumption liquid measure
Less, the advantages that easy to operate.
Detailed description of the invention
In order to illustrate more clearly of this specification embodiment or technical solution in the prior art, below will to embodiment or
Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
The some embodiments recorded in this specification, for those of ordinary skill in the art, in not making the creative labor property
Under the premise of, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram for polymer flow drag reduction evaluating apparatus that this specification provides；
Fig. 2 is the structural schematic diagram for another polymer flow drag reduction evaluating apparatus that this specification provides；
The agitating shaft in one embodiment that Fig. 3 provides for this specification adds the top view of agitator arm；
The agitating shaft in another embodiment that Fig. 4 provides for this specification adds the front view of agitator arm；
Fig. 5 is the stirring measuring surface schematic diagram in another embodiment that this specification provides；
Fig. 6 is the velocity vector schematic diagram in another embodiment that this specification provides；
Fig. 7 is a kind of flow diagram for polymer flow drag reduction evaluation method that this specification provides；
Fig. 8 is the pure oily turbulivity schematic diagram in another embodiment that this specification provides；
Fig. 9 is that 5min turbulivity schematic diagram is stirred in the 20ppm1# agent in another embodiment that this specification provides；
Figure 10 is that 150min turbulivity schematic diagram is stirred in the 20ppm1# agent in another embodiment that this specification provides；
Figure 11 is the impeller direction of extension core space turbulivity mean value signal in another embodiment that this specification provides
Figure；
Figure 12 is the pure oily Turbulent Kinetic schematic diagram in another embodiment that this specification provides；
Figure 13 is that 20min Turbulent Kinetic schematic diagram is stirred in the 10ppm1# agent in another embodiment that this specification provides；
Figure 14 is that 20min Turbulent Kinetic schematic diagram is stirred in the 20ppm1# agent in another embodiment that this specification provides；
Figure 15 is that 20min Turbulent Kinetic schematic diagram is stirred in the 30ppm1# agent in another embodiment that this specification provides；
Figure 16 is the shearing 20min core space Turbulent Kinetic Change in Mean rate in another embodiment that this specification provides
Schematic diagram；
Figure 17 is the pure oily energy absorbing device schematic diagram in another embodiment that this specification provides；
Figure 18 is that the signal of 20min energy absorbing device is stirred in the 20ppm1# agent in another embodiment that this specification provides
Figure；
Figure 19 is that 20min energy dissipation schematic diagram is stirred in the 20ppm2# agent in another embodiment that this specification provides；
Figure 20 is the shearing 20min core space energy absorbing device mean value signal in another embodiment that this specification provides
Figure.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution in this specification, below in conjunction with this explanation
Attached drawing in book one or more embodiment carries out the technical solution in this specification one or more embodiment clear, complete
Site preparation description, it is clear that described embodiment is only specification a part of the embodiment, instead of all the embodiments.Based on saying
Bright book one or more embodiment, it is obtained by those of ordinary skill in the art without making creative efforts all
The range of this specification example scheme protection all should belong in other embodiments.
Currently used drag reducer evaluating device has Simulative Loop, rotating circular disk device, rotational rheometer etc..Use rotation
Device for disc and rotational rheometer evaluation polymer drag reducer function and effect are usually smaller with solvent usage, but due between test
Gap is smaller, needs higher rotation speed, therefore measures stability and be difficult to ensure.And circuit test then exist it is complicated for operation, no
The problem of easy cleaning, while very high solvent consumption is brought, for evaluating for a variety of drag reducer effects, economy is bad.
Correspondingly, this specification embodiment provides a kind of polymer flow drag reduction evaluating apparatus, can by particle at
As test macro and blender combine the information of flow to test test liquid under the conditions of different plus agent, and then pass through analysis
The influence for adding agent front and back characteristic parameter of the flow field to evaluate polymer drag reducer to current system.The dress that specification embodiment provides
It sets, test liquid can be made to reach turbulence state in test process under lower speed of agitator, to ensure that test macro is whole
The stability of body improves the accuracy of test result.Meanwhile the device that this specification embodiment provides also has consumption liquid measure
Less, the advantages that easy to operate.
Fig. 1 is a kind of structural schematic diagram of polymer flow drag reduction evaluating apparatus that this specification provides.Specifically
One embodiment as shown in Figure 1, this specification provide polymer flow drag reduction evaluating apparatus one embodiment in, the dress
Set may include stirring sub-device and test subsystems.Wherein,
The stirring sub-device may include the first container and blender for installing test liquid, and the blender can
With the agitator arm for including agitating shaft and being fixed on agitating shaft, the agitator arm can be used for the test in the first container
Liquid is stirred；
The test subsystems may include laser beam emitting device, image collecting device, synchronizer and processor, the place
Reason device controls the laser beam emitting device by the synchronizer, image collecting device works；
The laser beam emitting device can be used for the first container emission pulse laser light beam；
Described image acquisition device is used to shoot the liquid flow field image under blender stirring in the first container, and will
The liquid flow field image sends the processor to；
The processor can be used for handling the liquid flow field image, obtain test liquid information of flow.
As shown in Figure 1, the evaluating apparatus may include stirring sub-device and test subsystems, the stirring sub-device can
To include the first container 101 and blender 102, the test subsystems may include laser beam emitting device 103, image collector
Set 104, synchronizer 105 and processor 106.
The first container 101 can be used for installing test liquid.The test liquid can be for without the pure of drag reducer
After oil liquid body and addition drag reducer plus agent liquid, the concentration and type of drag reducer, which can according to need, to be adjusted.It is specific real
The pure oil liquid body for being free of drag reducer can be first added in Shi Shi into the first container, after completing corresponding test, then into container plus
Enter drag reducer accordingly to be tested, then, then is stepped up the concentration of drag reducer and is successively accordingly tested.Accordingly, with respect to
Test loop path evaluating apparatus, the device that this specification embodiment provides, even if under a variety of drag reducers and a variety of concentration conditions, consumption
Liquid measure is still less, more economically.When test, a certain amount of tracer example can be added into the test liquid, to be used for
Test stirring system flow field characteristic.
Fig. 2 indicates the structural schematic diagram for another polymer flow drag reduction evaluating apparatus that this specification provides.Preferably,
As shown in Fig. 2, in another embodiment of this specification, the evaluating apparatus can also include second container 107, described first
Container 101 can be set in the second container 107.Gap between the first container 101 and the second container 107
In can be equipped with central fluid, for eliminates shooting stirring system image when refractive index influence, reduction picture noise.
As shown in Figure 1, the blender 102 may include agitating shaft 1021 and the agitator arm that is fixed on agitating shaft
1022, the agitator arm 1022 can be used for being stirred the test liquid in the first container 101.The blender 101
On control device can be set, also can connect control device, the control device can control the rotation of agitating shaft with
And velocity of rotation, and then control the rotation and velocity of rotation of agitator arm.The agitator arm 1022 can be built in test fluid
In body, to be stirred to test liquid, and then Turbulent Flow Field is generated in test fluid body, to simulate drag reducer in actual production
Working condition.
The revolving speed of agitator arm 1022 can be arranged according to whether liquid flow field reaches turbulent flow state, with accurate
Simulate the working condition of drag reducer in actual production.Preferably, in one embodiment of this specification, the agitator arm 1022
Revolving speed can be set at 200-600rpm (rev/min).Relative to rotating circular disk device and rotational rheometer, this specification is real
Applying the revolving speed of the agitator arm in example, that no setting is required is very high, and test liquid can reach turbulent flow state, therefore, utilize this theory
The device that bright book embodiment provides can be very good the stability for guaranteeing test macro entirety, and then guarantee the standard of test result
True property.
The gauge size of the agitator arm 1022, which can according to need, voluntarily to be selected.Fig. 3 indicates one reality of this specification
The top view that the agitating shaft provided in example adds agitator arm is applied, Fig. 4 indicates that corresponding agitating shaft adds the front view of agitator arm.Such as
Shown in Fig. 3 and Fig. 4, it is preferred that in one embodiment of this specification, the agitator arm 1022 can be six leaf Rushton
Impeller.The blade of six leaf Rushton impellers is rectangle, the flow field that is generated near impeller formed streamline be it is horizontal, can be with
The streamline of fluid in better analogy pipeline, as shown in the motion pattern shown in Fig. 6 box.In the present embodiment, pass through preferably six
Leaf Rushton impeller can preferably simulate the information of flow in actual production in pipeline as agitator arm, and then improve and comment
The accuracy of valence result.When it is implemented, the agitator arm 1022 can be carried out to spray black processing, to reduce shooting flow field figure
Agitator arm bring reflective noise when picture.
In one embodiment of this specification, can use between the agitator arm 1022 and the agitating shaft 1021 can
Detachable is fixedly connected with mode, in order to clean.Preferably, spiral shell can be used between the agitator arm and the agitating shaft
Line connection.
In another embodiment of this specification, described device can also include adjustable fixed bracket, the fixation
Bracket can be used for fixing the blender, at the same time it can also the position being located in the first container for controlling agitator arm.
As shown in Figure 1, the test subsystems may include laser beam emitting device 103, image collecting device 104, synchronize
Device 105 and processor 106.In some embodiments, the laser beam emitting device 103, image collecting device 104 can pass through institute
It states synchronizer 105 to be connected with the processor 106, correspondingly, the processor 106 can be controlled by the synchronizer 105
The laser beam emitting device 103, image collecting device 104 work.
The laser beam emitting device 103 can be used for emitting arteries and veins to the first container 101 under the control of processor 106
Rush laser beam.The parameter of the laser beam emitting device 103 can according to need self-setting.It is described in some embodiments
Laser beam emitting device 103 can be dual-cavity laser, can produce the pulse laser that wavelength is 532nm.
Described image acquisition device 103 can be used for shooting the under blender stirring under the control of processor 106
Liquid flow field image in one container 101.As shown in Figure 1, in some embodiments, described image acquisition device 104 can be with
It is attached again by another connecting line with locating processor 106, the liquid flow field image transmitting that will be acquired gives the place
Manage device 106.
Fig. 5 indicates the stirring measuring surface schematic diagram provided in this specification one embodiment, wherein the stirring measuring surface
For plane corresponding to the image of image acquisition device flow field.In Fig. 5, the region on the left of agitator arm in box is corresponding
Measuring surface is stirred, u indicates that impeller is stretched to speed, and v is impeller axial velocity, and Z indicates ordinate, and r is wheel rotation radius, W
For impeller width, d is wheel rotation diameter.As shown in Figure 1 and Figure 5, in some embodiments, stirring measuring surface can choose edge
The middle vertical plane of impeller shaft can easily observe different stirrings using the middle vertical plane of impeller shaft as stirring measuring surface with simpler
Liquid flow field information under phase.
The structure and parameter of described image acquisition device 104 can self-settinies according to actual needs.Some embodiments
In, described image acquisition device 104 can be CCD camera.Preferably, in one embodiment of this specification, described image is adopted
Optical filter identical with the laser wavelength of the laser beam emitting device 103 transmitting can be installed in acquisition means 104.As it is corresponding with
The pulse laser of above-mentioned 532nm can be equipped with 532nm optical filter in CCD camera.By the way that filter is arranged in image collecting device
Mating plate, external stray light bring noise when can reduce flow field Image Acquisition.
As shown in Figure 2, it is preferred that in one embodiment of this specification, described device can also include shaft encoder
108, the shaft encoder 108 can be fixed on the agitating shaft 1021, and pass through the synchronizer 105 and the processor
106 are connected.The shaft encoder 108 can be connected by flange with the agitating shaft 1021.
The shaft encoder 108 can be used for obtaining the real-time stirring phase of blender 102, and can pass through the synchronization
Device 105 gives the real-time stirring transmission of phase to the processor 106.Correspondingly, the processor 106 can be also used for pre-
If stirring and sending synchronous letter to the laser beam emitting device 103 and image collecting device 104 by the synchronizer 105 under phase
Number, it is worked with triggering the laser beam emitting device 103 and image collecting device 104.
In 102 whipping process of blender, the shaft encoder 108 for being mounted on agitating shaft 1021 can obtain agitator arm in real time
1022 shaft angle information, wherein the stirring phase of blender 102 is corresponding with the shaft angle of agitator arm 1022, that is, is stirred
The real-time stirring phase of device 102.Then, the real-time stirring phase that shaft encoder 108 can will acquire is transmitted by synchronizer 105
To processor 106.
Processor 106 can under default stirring phase by the synchronizer 105 to the laser beam emitting device 103 and
Image collecting device 104 sends synchronization signal, is worked with triggering the laser beam emitting device 103 and image collecting device 104.
In the case where other conditions are all the same, there is also certain othernesses for the flow field data under difference stirring phase.
Using the structure of this specification above-described embodiment, by the way that shaft encoder is arranged, the stirring phase of blender is obtained using shaft encoder
Position, and then control laser beam emitting device and image collecting device and work under default stirring phase, it can be targeted
Obtain the liquid flow field information under a certain default stirring phase.Correspondingly, adding agent state for different, identical stir can be acquired
The flow field data mixed under phase are compared, so as to further increase comparing precision of analysis.
Correspondingly, the basis that flow field data under the conditions of under based on same stirring phase to different plus agent are analyzed
On, it can also further choose the flow field analysis under a variety of stirring phases and be analyzed as a result, carrying out further compare, analysis is different
The otherness for stirring the analysis result under phase is further increased to the comprehensive of current system analysis.
The processor 106 can be used for carrying out the liquid flow field image processing and obtain liquid flow field information, in turn
The parameter informations such as liquid turbulence flow field characteristic are determined based on liquid flow field information analysis.Acquired image can successively be carried out
Mask (shielding), it goes background, image association to calculate flow field vector, gliding smoothing and handling averagely, finally obtains analyzed area
Speed vector figure (as shown in Figure 6), and then obtain flow field velocity Vector Message.Wherein, Fig. 6 indicates this specification one embodiment
The velocity vector schematic diagram of middle offer.
In some embodiments, liquid turbulence characteristic parameter of the flow field can also be calculated according to flow field velocity Vector Message, led to
Analyses and comparison are crossed whether there is or not liquid turbulence characteristic parameter of the flow field data when drag reducer, come accurate evaluation drag reducer function and effect and
Performance.
The device that the above-mentioned each embodiment of this specification provides, the office of progress liquid that can be more economical, efficient, stable
Portion's flow field analysis, so that accurate analyzing polymers drag reducer evaluates the performance of drag reducer to the function and effect of Turbulent Flow Field.
Based on polymer flow drag reduction evaluating apparatus described above, this specification one or more embodiment also provides one
Kind polymer flow drag reduction evaluation method.Fig. 7 indicates a kind of stream for polymer flow drag reduction evaluation method that this specification provides
Journey schematic diagram.As shown in fig. 7, the method may include:
S102: test liquid is added into the first container, and a certain amount of tracer ion is added；
S104: laser beam emitting device and blender are opened, the laser beam emitting device is under the control of a processor to described
The first container emits laser beam；
S106: image collecting device shoots the flow field image of the test liquid under the control of the processor, and will
The flow field image is transmitted to the processor；
S108: the processor is analyzed and processed the flow field image, obtains the flow field velocity of the test liquid
Vector Message.
Test liquid can first be added into the first container, the test liquid can be the pure oil liquid body without drag reducer
And after drag reducer plus agent liquid is added.At the same time it can also which a certain amount of tracer example is added into the test liquid.
In some embodiments, the first container can also be placed in second container, be held to the first container with second
Central fluid is added in the gap of device, to eliminate the locally reflective influence of the first container curvature bring.
It is then possible to check the connection in polymer flow drag reduction evaluating apparatus between each equipment, adjust, setting is surveyed
Parameter is tried, and carries out the calibration etc. in flow field.After preparation is completed, each equipment can be opened.Laser beam emitting device is to
Test liquid propellant laser beam in one container, the agitator arm of blender are based on preset mixing speed in test fluid body
It is stirred, forms turbulent flow in liquid.
Image collecting device can acquire the flow field image of the test liquid, and the flow field image is transmitted to processing
Device.As shown in figure 4, stirring measuring surface can choose the middle vertical plane along impeller shaft, wherein the stirring in some embodiments
Plane corresponding to measuring surface, that is, image acquisition device flow field image.
Under a certain revolving speed, mixing time is controlled, n convection current field picture can be shot.The n convection current field picture may include
Pure oil liquid body after pure oil liquid body, addition drag reducer without drag reducer and the pure oil liquid containing the drag reducer under various concentration
Corresponding n width flow field picture under the states such as body.
Such as, can first obtain the corresponding flow field image of pure oil liquid body without drag reducer, then, then into pure oil liquid body plus
Enter drag reducer, obtains the corresponding flow field image of pure oil liquid body after drag reducer is added.The drag reduction of addition can also be further increased
The concentration of agent, to obtain the flow field image under different drag reducer concentration.
After processor obtains the flow field image, it can be analyzed and processed with convection current field picture.Can to picture successively into
Row mask, it goes background, image association to calculate flow field vector, gliding smoothing and handling averagely, finally obtains analyzed area speed
Polar plot, acquisition plus agent/agent flow field velocity Vector Message is not added.
In another embodiment of this specification, the method can also include:
Shaft encoder obtains the real-time stirring phase of blender, and the real-time stirring phase is transmitted to by synchronizer
Processor；
The processor is according to the real-time stirring phase controlling laser beam emitting device and image collecting device work received
Make, to obtain the flow field velocity Vector Message under default stirring phase.
In blender whipping process, the shaft encoder for being mounted on agitating shaft can obtain the shaft angle letter of agitator arm in real time
Breath obtains the stirring phase of blender, and the stirring phase that can be will acquire is transferred to processor by synchronizer.Processor
It can be worked according to the stirring phase controlling control laser beam emitting device and image collecting device received, to obtain default stir
Mix the flow field velocity Vector Message under phase.
Having a certain difference property of flow field data under difference stirring phase, for the different conditions such as before and after addition drag reducer
Under, by controlling the filming frequency of image collecting device, the flow field data obtained under same phase are compared, Ke Yijin
One step improves comparing precision of analysis.
In one embodiment of this specification, the method can also include:
Turbulent Flow Field supplemental characteristic is calculated according to the flow field velocity Vector Message；
According to the comparison result to the Turbulent Flow Field supplemental characteristic under different testing times and/or different plus agent state, really
Determine the function and effect of drag reducer.
Flow field velocity vector data under any one available state, it is then possible to according to flow field velocity vector number
According to the corresponding Turbulent Flow Field supplemental characteristic of calculating.The Turbulent Flow Field parameter may include that turbulivity, energy absorbing device, turbulent flow are dynamic
The Turbulent Flow Fields characterisitic parameter such as energy, turbulent structure.It is then possible to compare each parameter of analysis with mixing time plus agent condition (if any
Without drag reducer, drag reducer type, concentration etc.) variation, evaluate the function and effect and its performance of drag reducer.
In some embodiments, stirring system turbulivity calculation expression can be with are as follows:
Wherein, TU is that impeller is stretched to speed turbulivity, and TV is impeller axial velocity turbulivity, UtipFor impeller tips speed
Degree, UrmsIt stretches for impeller to fluctuation velocity, VrmsFor impeller axial direction fluctuation velocity, uiIt stretches for impeller to instantaneous velocity, viFor leaf
Wheel shaft is to instantaneous velocity, UmeanIt stretches for impeller to average speed, VmeanFor impeller average velocity of axes, N is sampling number.
Wherein, TUR is that impeller is stretched to speed turbulivity change rate, TUoilIt stretches for pure oily impeller to speed turbulivity,
TUDRTo add agent oil impeller to stretch to speed turbulivity.
In some embodiments, after polymer is added in stirring system, the calculation expression of Turbulent Kinetic are as follows:
Wherein, k is Turbulent Kinetic,The absolute value to fluctuation velocity average value is stretched for impeller,For impeller axial direction arteries and veins
The absolute value of dynamic speed average.
Wherein, TKER is Turbulent Kinetic change rate, TKEoilFor pure oily Turbulent Kinetic, TKEDRTo add agent oil Turbulent Kinetic.
In some embodiments, energy absorbing device be can be expressed as:
Wherein, ε R is energy absorbing device change rate, εoilFor pure oily energy absorbing device, εDRTo add agent oil energy absorbing device.
In some embodiments, the calculation method of energy absorbing device may include direct method (DE), big whirlpool in stirring system
Simulation (SGS), revised law (MDE), dimensionless method (DA).
The calculation method of direct method can be with are as follows:
Wherein, εDEFor turbulence energy dissipative shock wave, ν is kinematic viscosity.
The calculation method of Large Eddy Simulation Method can be with are as follows:
Wherein, εSGSTurbulence energy dissipative shock wave, C are calculated for Large Eddy Simulation MethodSFor Smagorinsky constant, Δ is analysis ruler
It is very little.
In some embodiments, the calculation method of revised law:
ε=max (εMDE)
Wherein, feFor correction factor, α is constant, and η is modified Kolmogorov length, εMDETurbulent flow is calculated for revised law
Energy absorbing device.
The calculation method of dimensionless method can be with are as follows:
Wherein, A is empirical, and L is integration lengths scale, ur′msFor fluctuation velocity root mean square, εoilIt is consumed for pure oily energy
The rate of dissipating, εDAThe turbulence energy dissipative shock wave calculated for dimensionless method.
Correspondingly, any one of the above method can be calculated the calculated result ε obtainedDE、εSGS、εMDE、εDAAs energy
Dissipative shock wave εoil、εDRValue, further using following formula calculate energy absorbing device:
In some embodiments, since RUSHTON agitator arm is in whipping process, two can be nearby generated up and down in impeller
A whirlpool, it is possible to further probe into the influence being added after polymer to turbulent structure intensity and position.The meter of turbulent structure
Calculation method can be such that
detS2+Ω2- λ I=0
λ1'=(a+c)2
Wherein, S is strain rate tensor, and Ω is whirlpool tensor,For differential operator, U is flow field velocity vector, X1Indicate stirring
The direction impeller shaft radius r, X3Indicate ordinate Z-direction, λ1′、λ2′、λ3' it is characterized value, I indicates unit matrix.
Trailing vortex center is in λ2At ' < 0, turbulent structure intensity can use λ2' maximum value indicate, i.e. λ2' maximum
The corresponding position of absolute value is the center of trailing vortex.
In order to better illustrate scheme provided by the above embodiment, this specification also provides a kind of apply described in above-mentioned implementation
The concrete operations example of device is as follows:
The apparatus may include the first container, second container, shaft encoder, impeller, blender, CCD camera, synchronizations
Device, laser beam emitting device, processor.Agitator arm structure and size are optional, and impeller location and agitator speed are adjustable.
The relevant parameter of test macro can need to be such that flow field reaches according to test condition self-setting, the setting of rotating speed of agitator
To turbulent flow fluidised form.In this test process, setting revolving speed is 200-600rpm, and camera is set as double frame shooting modes, each test
N is to image for point shooting.Image is post-processed by the poster processing soft of processor, n is calculated and the average value of image is obtained
The velocity vector data of test point, to reduce experimental error.
Before opening laser, first check in CCD camera whether be mounted with optical filter.Inspection before test connects laser controlling
Device, shaft encoder, camera power supply open whip switch, open laser emitter switch, remove laser and camera protective case,
Control software is opened, checks whether equipment connects intact (including whether laser, camera, shaft encoder connect).Click preview
Into preview mode, the first container, the position of second container and agitator arm height and position are adjusted, laser emitter angle is adjusted
Degree and position focus to camera so that test device is in camera shooting area, so that shooting picture and trace particle ratio
It is more visible.Then, test experiments scheme and setting parameter are carried out, makes it to obtain correct flow field velocity distribution.
It is then possible to obtain flow field velocity Vector Message by testing, calculating is carried out based on flow field velocity distribution and obtains rapids
Flow field parameter is flowed, influence of the drag reducer to Turbulent Flow Field flow parameter is added in analysis, and then evaluates the effect of polymer drag reducer
Effect.
1. example 1: the test of drag reducer cutting performance and shear resistant:
(1) beaker (the first container) is added in pure oil solution, is added without drag reducer at this time, a certain amount of trace particle is added,
Stirring system flow field characteristic when etc. no drag reducer to be tested.
(2) computer, laser controller, blender and camera power supply are connected, sequence opens computerized control system, laser controlling
Device, whip switch, running control software, check device connection are arranged test parameter, regulating device position, and test
Flow field shooting result.
(3) blender is run, is controlled testing time (0-150min), log-on data acquisition saves the image of acquisition, goes forward side by side
Row post-processing.
(4) the 1# drag reduction agent solution for configuring 20ppm, is added a certain amount of trace particle.
(5) the flow field velocity vector that step (2)-(3) obtain under the conditions of adding agent is repeated to be distributed.
(6) (3), (5) middle velocity vector obtained are exported as a result, and being handled by processor, calculating acquisition turbulent flow
The parametric results such as degree, Turbulent Kinetic, energy absorbing device.
(7) each test point turbulivity cloud charts are drawn, core space turbulivity mean value is calculated, draws what it was changed over time
Curve, as shown in figures s-11.
Wherein, Fig. 8 shows pure oily (pure oil) turbulivity schematic diagram, Fig. 9 indicates that 5min turbulivity is stirred in 20ppm1# agent
Schematic diagram, Figure 10 indicate that 150min turbulivity schematic diagram is stirred in 20ppm1# agent, and Figure 11 indicates impeller direction of extension core space turbulent flow
Spend mean value (average) schematic diagram.Ordinate 2z/W in each attached drawing of this specification indicates ordinate with respect to half of width of impeller
Position, r/R indicates practical relative coordinate of the impeller direction of extension coordinate with respect to impeller radius R.When abscissa in Figure 11 is
Between/minute (TIME/MIN), ordinate is turbulivity (TU).TU in Fig. 8-Figure 10 indicates turbulivity data, and level is indicated not
Correspond to value of contour in figure with TU value.
2. embodiment 2: the test that drag reducer concentration acts on drag-reduction effect.
(1) the 1# drag reduction agent solution of 10,20,30ppm is respectively configured, a certain amount of trace particle is added.
(2) parametric results such as turbulivity, Turbulent Kinetic, energy absorbing device are obtained by checking, acquiring, handle, calculate.
(3) each test point Turbulent Kinetic cloud charts are drawn, core space Turbulent Kinetic Change in Mean rate is calculated, draw its with
The curve of concentration variation, as shown in figures 12-16.
Wherein, Figure 12 indicates that pure oily Turbulent Kinetic schematic diagram, Figure 13 indicate that 10ppm1# agent stirring 20min Turbulent Kinetic is shown
It is intended to, Figure 14 indicates that 20min Turbulent Kinetic schematic diagram is stirred in 20ppm1# agent, and Figure 15 indicates that 20min turbulent flow is stirred in 30ppm1# agent
Kinetic energy schematic diagram, Figure 16 indicate shearing 20min core space Turbulent Kinetic Change in Mean rate (TKER) schematic diagram.In Figure 12-Figure 15
TKE indicate Turbulent Kinetic data, Level indicate different TKE values correspond to figure in value of contour.
3. embodiment 3: the evaluation of different drag reducer resistance reducing performances.
(1) 1#, 2# drag reduction agent solution of 20ppm is respectively configured, a certain amount of trace particle is added.
(2) parametric results such as turbulivity, Turbulent Kinetic, energy absorbing device are obtained by checking, acquiring, handle, calculate.
(3) each test point energy absorbing device cloud charts are drawn, core space energy absorbing device mean value is calculated, draws it at any time
Between the curve that changes, as shown in Figure 17-Figure 20.
Wherein, Figure 17 indicates that pure oily energy absorbing device schematic diagram, Figure 18 indicate that 20min energy dissipation is stirred in 20ppm1# agent
Rate schematic diagram, Figure 19 indicate that 20min energy absorbing device schematic diagram is stirred in 20ppm2# agent, and Figure 20 indicates shearing 20min core space energy
Measure dissipative shock wave mean value schematic diagram.Wherein, the ordinate of Figure 20 is energy absorbing device (εDA).DA in Figure 17-Figure 19 indicates energy
Dissipative shock wave data, level indicate the value of contour that different DA values correspond in figure.
This specification evaluation method provided by the above embodiment can mutually be tied by particle imaging test macro and blender
The information of flow to test test liquid under the conditions of different plus agent is closed, the rapids under the conditions of different plus agent is calculated based on information of flow
Flow parameter information, and then the influence using turbulent parameters information come accurate evaluation polymer drag reducer to current system.And it tests
Test liquid can be made to reach turbulence state, under lower speed of agitator in the process so as to be further ensured that test macro is whole
The stability of body improves the accuracy of test result.
It should be noted that term " first ", " second " etc. are used for description purposes only and distinguish in the description of the present application
Similar object between the two and is not present sequencing, can not be interpreted as indication or suggestion relative importance.In addition,
In the description of the present application, unless otherwise indicated, the meaning of " plurality " is two or more.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to preceding claims and this
The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special
The disclosure of benefit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any aspect is not intended to abandon the body matter, also should not be considered as applicant the theme is not thought of as it is disclosed
Apply for a part of theme.
Claims (10)
1. a kind of polymer flow drag reduction evaluating apparatus, which is characterized in that described device includes stirring sub-device and test subsystem
System, wherein
The stirring sub-device includes the first container and blender for installing test liquid, and the blender includes agitating shaft
And it is fixed on the agitator arm on agitating shaft, the agitator arm is for being stirred the test liquid in the first container；
The test subsystems include laser beam emitting device, image collecting device, synchronizer and processor, and the processor passes through
The synchronizer controls the laser beam emitting device, image collecting device works；
The laser beam emitting device is used for the first container emission pulse laser light beam；
Described image acquisition device is used to shoot the liquid flow field image under blender stirring in the first container, and will be described
Liquid flow field image sends the processor to；
The processor obtains test liquid information of flow for handling the liquid flow field image.
2. the apparatus according to claim 1, which is characterized in that described device further includes shaft encoder, the shaft encoder
It is fixed on the agitating shaft, and is connected by the synchronizer with the processor, the shaft encoder is for obtaining stirring
The real-time stirring phase of device, and the real-time stirring transmission of phase is given to the processor by the synchronizer；
Correspondingly, the processor be also used under default stirring phase through the synchronizer to the laser beam emitting device and
Image collecting device sends synchronization signal, to trigger the laser beam emitting device and image collecting device work.
3. the apparatus according to claim 1, which is characterized in that described device further includes second container, the first container
It is set in the second container, central fluid is housed in the gap between the first container and the second container, is used for
Eliminate the locally reflective influence of the first container curvature bring.
4. the apparatus according to claim 1, which is characterized in that described device further includes adjustable fixed bracket, described
Fixed bracket is used to fix the blender, and control agitator arm is located at the position in the first container.
5. the apparatus according to claim 1, which is characterized in that the agitator arm is six leaf Rushton impellers.
6. the apparatus according to claim 1, which is characterized in that the revolving speed of the agitator arm is 200-600 revs/min.
7. the apparatus according to claim 1, which is characterized in that be equipped in described image acquisition device and sent out with the laser
The identical optical filter of laser wavelength of injection device transmitting.
8. a kind of polymer flow drag reduction evaluation method based on any one of claim 1-7 described device, which is characterized in that institute
The method of stating includes:
Test liquid is added into the first container, and a certain amount of tracer ion is added；
Laser beam emitting device and blender are opened, the laser beam emitting device is sent out to the first container under the control of a processor
Penetrate laser beam；
Image collecting device shoots the flow field image of the test liquid under the control of the processor, and by the flow field figure
As being transmitted to the processor；
The processor is analyzed and processed the flow field image, obtains the flow field velocity Vector Message of the test liquid.
9. according to the method described in claim 8, it is characterized in that, the method also includes:
Shaft encoder obtains the real-time stirring phase of blender, and the real-time stirring phase is transmitted to processing by synchronizer
Device；
The processor works according to the real-time stirring phase controlling laser beam emitting device and image collecting device received, with
Obtain the flow field velocity Vector Message under default stirring phase.
10. according to the method described in claim 8, it is characterized in that, the method also includes:
Turbulent Flow Field supplemental characteristic is calculated according to the flow field velocity Vector Message；
According to different mixings time and/or add the corresponding Turbulent Flow Field supplemental characteristic of agent condition comparison result, determine drag reduction
The function and effect of agent.
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| US20230184067A1 (en) * | 2021-12-14 | 2023-06-15 | Saudi Arabian Oil Company | Determining Drag Reducing Agents' Performance |
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