CN105806780B - The phase content measurement method of passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions - Google Patents
The phase content measurement method of passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions Download PDFInfo
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Abstract
The invention discloses a kind of passage aisle gas-liquid two-phase flow containing rate measuring system and method based on more visions.The system includes a high-speed camera, two light sources, right-angle prism, small pipeline, glycerine slot, computer.First, it is mutually perpendicular to angle from two while obtaining passage aisle biphase gas and liquid flow flow image sequence；Secondly, image preprocessing and optic aberrance revising are carried out, the phase content measurement model of bubble flow, slug flow, annular flow and the typical flow pattern of four kinds of wave flow is established；Then, the feature vector of image is extracted, meteor trail echoes are carried out；Finally, the phase content measurement model of corresponding flow pattern is selected, phase content is calculated.The present invention utilizes more vision techniques, establishes phase content measurement model for each typical flow pattern, flow pattern information is introduced into phase content measurement model, improves the accuracy of measurement.Corresponding device has many advantages, such as simple in structure, non-contact measurement, visualization.
Description
Technical field
The present invention relates to multiphase flow parameter measurement field more particularly to a kind of passage aisle biphase gas and liquid flows based on more visions
Phase content measuring system and method.
Background technology
In recent years, with the emergence of micro-processing technology and new material technology, industrial equipment show micromation, miniaturization
Development trend.Since micromation, compact apparatus have many advantages, such as efficient, quick, easily-controllable and save raw material, in biology, doctor
The fields such as treatment, chemical industry, pharmacy are widely used.Therefore, passage aisle gas-liquid two-phase flow parameter measurement becomes current
One research hotspot and difficulties.
Compared to regular channels, passage aisle gas-liquid two-phase flow parameter measurement has certain difficulty.Under miniature scale, by
In the reduction of hydraulic diameter so that the influence of surface tension and viscosity effect becomes larger, and the influence of gravity is opposite to be weakened, conventional
Theoretical model and empirical equation in channel are no longer applicable in.
Currently, existing passage aisle gas-liquid two-phase flow containing rate measurement method mainly has fast valve method, optical method, electric method
With high speed video process etc..In contrast, high speed video process has many advantages, such as intuitive, untouchable, in passage aisle two phase flow phase
It is widely used in being measured containing rate.However, the existing phase content measurement method majority based on high-speed camera is obtained from an angle
Two-phase stream picture is taken, the shape information of gas-liquid two-phase spatial information and different angle is obtained insufficient.More vision techniques utilize more
A camera or single camera constitute system from the image information of multiple angles acquisition research object with optical device, efficiently solve
The problem of single vision acquisition of information deficiency, to solve the problems, such as that complex parameters measurement provides possibility.
Invention content
It is insufficient for the existing passage aisle gas-liquid two-phase flow containing rate measurement method acquisition of information based on high-speed photography, it is accurate
The not high enough problem of true degree, the present invention by studying repeatedly, for passage aisle biphase gas and liquid flow, it is proposed that one kind is based on regarding more
The passage aisle gas-liquid two-phase flow containing rate measuring system and method for feel obtain two phase flow two mutually simultaneously using more vision systems
The image of vertical angle carries out image preprocessing and optic aberrance revising, establishes the phase content measurement model of four kinds of typical flow patterns,
It extracts feature vector and carries out meteor trail echoes, select the phase content measurement model of corresponding flow pattern, calculate phase content.
Passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions includes passage aisle pipe-line system, more visions height
Fast image acquisition units and microcomputer.Passage aisle pipe-line system is made of the passage aisle being immersed in glycerine slot.It regards more
Feel that high-speed image sampling unit is made of two LED light sources, right-angle prism, high-speed cameras.Right-angle prism is put close to glycerine slot
It sets, and one right-angle side is perpendicular to the imaging plane of high-speed camera.Two light sources provide the backlight of two vertical direction, place
High-speed camera in front of glycerine slot takes two two phase flow images for being mutually perpendicular to angle, collected figure simultaneously
It is calculated for image procossing and phase content as being transferred in microcomputer.
Steps are as follows for passage aisle gas-liquid two-phase flow containing rate measurement method based on more visions：
The first step obtains image：Using more vision high-speed image sampling units, while obtaining two and being mutually perpendicular to angle
Passage aisle biphase gas and liquid flow flow image sequence；
Second step establishes phase content measurement model：Image preprocessing and optic aberrance revising are carried out, to four kinds of typical flow patterns
It is modeled respectively；
Third walks, meteor trail echoes：The feature vector of image is extracted, meteor trail echoes are carried out；
4th step calculates phase content：The phase content measurement model of corresponding flow pattern is selected, phase content is calculated.
Wherein, phase content measurement model is established to be as follows：
1) image preprocessing.It is pre-processed, is obtained by the filling of difference shadow method, medium filtering, edge detection and binaryzation
Bianry image.
2) optic aberrance revising.Correction coefficient is obtained by optical path analysis, realizes the correction of biphase gas and liquid flow flow image.
For circular glass pipeline, tube wall refraction rate and glycerine approximately equal.Pipeline, which is immersed in glycerine slot, can reduce tube wall
The influence caused by captured image.As shown in figure 3, using section for the organic glass cuboid of the square of 25mm × 25mm
Pipeline is immersed in glycerine slot by glycerine slot, and the center of pipeline center position and cross-sectional square shape coincides.For object in pipeline
Point P (x, y), the light sent out by the point occurs to reflect for the first time in liquid phase and tube wall interface, in glycerine groove groove wall and air circle
Face occurs second and reflects.The intersection point P' of reverse extending line of two adjacent rays sent out by point P after second of refraction
(x', y') is P pairs of picture point that should be observed that of point, may thereby determine that correction coefficient alpha=y/y' at point P.Obtain correction system
After number, bianry image is corrected.
3) four kinds of typical flow pattern modelings.The thought for using for reference " segmentation, approximation summation ", establishes bubble flow and slug flow phase respectively
Measurement model containing rate, cyclic annular flow containing rate measurement model, wavy flow containing rate measurement model.
Bubble flow and slug flow containing rate measurement model：Since the hydraulic diameter of passage aisle is smaller, at same section of pipeline
A bubble is only existed simultaneously on face, is not in the case where there are multiple bubbles in same section in conventional pipeline, Ke Yitong
The image for crossing two angles determines the size of bubble in both direction.The case where considering bubble flow and slug flow, in pipeline
It is ellipse by region equivalent shared by gas phase at same section.Within the scope of the axial length in pixels of pipeline, it is believed that shared by gas phase
Area of section it is equal, therefore the gas phase in the segment limit can be equivalent to an Elliptic Cylinder, the Elliptic Cylinder bottom surface is ellipse
The bianry image that round major and minor axis is mutually perpendicular to angle by two respectively determines.Thus, it is possible to by each bubble or slug etc.
Effect is the superposition of several Elliptic Cylinders, you can acquires the volume of each bubble or the corresponding gas phase of vent plug.
As shown in fig. 5, it is assumed that there are n bubble/vent plugs in captured single set of image.I-th of bubble/vent plug length institute
It is l to account for number of pixelsi, pixel shared by the elliptical major and minor axis of bubble section at corresponding j-th of the pixel of i-th of bubble/vent plug
Number is respectively aijWith bij, then the volume V that captured image corresponds to gas phase in pipeline section can be acquiredgas1For：
Wherein, μ is the corresponding physical length of each square pixel, αijFor aijCorresponding correction coefficient, βijFor bijIt is corresponding
Correction coefficient.Then correspond to the phase content ε of bubble flow/slug flow in pipeline section1For：
Wherein, VpipeFor the conduit volume that image taking arrives, L is the duct length that image taking arrives, and D arrives for image taking
Pipe diameter, phase content physical length μ corresponding with pixel is unrelated, and only with pixel shared by each dimensional parameters of two-phase stream picture
Number it is related.
During actual photographed, since length of pipe section taken in viewing field of camera is shorter, calculated by single set of image
Obtained phase content cannot accurately reflect the phase content under current flow pattern.Therefore, the image construction figure being continuously shot by N groups is chosen
As sequence, the average value of image sequence phase content is takenMutually contain as bubble flow/slug flow under corresponding experiment condition
Rate measured value, i.e.,：
Cyclic annular flow containing rate measurement model：It in horizontal pipe, is influenced by gravity, duct bottom liquid film is thicker；
And liquid film is distributed around even tube wall in vertical pipeline.It is similar with slug flow and bubble flow, it, will be in pipeline under annular flow flow pattern
Gas phase is approximately the superposition of several Elliptic Cylinders, and gaseous phase volume can be acquired accordingly, it is hereby achieved that phase content.Such as Fig. 6
It is shown, in acquired annular flow bianry image, number of pixels shared by the elliptical major and minor axis in gas phase section point at ith pixel
It Wei not aiWith bi, then single set of image correspond to pipeline section inner annular flow containing rate ε2For：
Wherein, αiFor aiCorresponding correction coefficient, βiFor biCorresponding correction coefficient.
The N group image construction image sequences being continuously shot are taken, the corresponding phase content of every group of image is calculated, is then averagedAs the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
Wavy flow containing rate measurement model：Under wave flow flow pattern, the volume of gas phase can be by several cylinders in pipeline
Volume is superimposed to obtain.It is different from other three kinds typical flow patterns, due to can be unique after determining height shared by gas phase and liquid phase
Determine the area of section shared by gas phase and liquid phase, therefore the list that the phase content of wave flow can be shot by pipeline side in horizontal pipe
The image of a angle determines.As shown in fig. 7, in acquired wavy stream picture, the height in gas phase section at i-th pixel
For hi, then single image correspond to the volume V of gas phase in pipeline sectiongas3For：
Then single image corresponds to the phase content ε of wave flow in pipeline section3For：
The N width image construction image sequences being continuously shot are taken, the corresponding phase content of each image is calculated, is then averagedAs the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
Description of the drawings
Attached drawing 1 is that the present invention is based on the passage aisle gas-liquid two-phase flow containing rate measuring systems of multi-visual information integration technology to show
It is intended to, in Fig. 1,1- passage aisle pipe-line systems, the more vision high-speed image sampling units of 2-, 3- microcomputers.
Attached drawing 2 is more vision high-speed image sampling units and passage aisle pipe-line system structural schematic diagram, in Fig. 2,4- first
LED light source, the second LED light sources of 5-, 6- glycerine slots, 7- passage aisles, 8- right-angle prisms, 9- high-speed cameras.
Attached drawing 3 is the index path that light is propagated in passage aisle and glycerine slot.
Attached drawing 4 is the passage aisle gas-liquid two-phase flow containing rate measurement flow chart based on more visions.
Attached drawing 5 is bubble flow and slug flow containing rate measurement model schematic diagram.
Attached drawing 6 is cyclic annular flow containing rate measurement model schematic diagram.
Attached drawing 7 is wavy flow containing rate measurement model schematic diagram.
Attached drawing 8 is the horizontal pipe of 4.0mm internal diameters and the phase content measurement result figure of vertical pipeline.
Specific implementation mode
With reference to attached drawing 1, the present invention utilizes the passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions, realizes small
Channel gas-liquid two-phase flow containing rate measures.Passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions includes passage aisle
Pipe-line system, more vision high-speed image sampling units and microcomputer three parts.
As shown in Fig. 2, passage aisle pipe-line system 1 is made of the passage aisle 7 being immersed in glycerine slot 6, more vision high speeds are schemed
As collecting unit 2 is made of high-speed camera 9, right-angle prism 8, the first LED light source 4, the second LED light source 5, more visions high speeds are schemed
As collecting unit be responsible for simultaneously acquisition two biphase gas and liquid flow flow images for being mutually perpendicular to angle, adopted by more vision high speed images
The image transmitting that collection unit 2 collects carries out image procossing to computer 3 and phase content calculates.
First LED light source 4 is placed perpendicular to passage aisle 6, and the second LED light source 5 is both perpendicular to the first LED light source
5 and passage aisle 6 and in being generally aligned in the same plane with the first LED light source 5, right-angle prism 8 is located at small relative to the first LED light source 4
6 other side of channel, high-speed camera 9 are located at 6 other side of passage aisle relative to the second LED light source 5, and the one of right-angle prism 8
Imaging plane of the right-angle side perpendicular to high-speed camera 6.
With reference to attached drawing 4, phase content is carried out according to the passage aisle gas-liquid two-phase flow containing rate measurement flow chart based on more visions
It calculates, the specific steps are：
The first step obtains image：Using more vision high-speed image sampling units, while obtaining two and being mutually perpendicular to angle
Passage aisle biphase gas and liquid flow flow image sequence；
Second step establishes phase content measurement model：Image preprocessing and optic aberrance revising are carried out, to four kinds of typical flow patterns
It is modeled respectively；
Third walks, meteor trail echoes：The feature vector of image is extracted, meteor trail echoes are carried out；
4th step calculates phase content：The phase content measurement model of corresponding flow pattern is selected, phase content is calculated.
Wherein, second step establish phase content measurement model the specific steps are：
1) image preprocessing：It is pre-processed, is obtained by the filling of difference shadow method, medium filtering, edge detection and binaryzation
Bianry image.
2) optic aberrance revising：Correction coefficient is obtained by optical path analysis, realizes the correction to bianry image.Using section
The organic glass cuboid glycerine slot being square, pipeline is immersed in glycerine slot, pipeline center position and cross-sectional square shape
Center coincide.For object point P (x, y) in pipeline, the light sent out by the point occurs for the first time in liquid phase and tube wall interface
Refraction occurs second in glycerine groove groove wall and Air Interface and reflects.It is reflected at second by two adjacent rays that point P is sent out
The intersection point P'(x', y' of reverse extending line afterwards) it is P pairs of picture point that should be observed that of point, it may thereby determine that the correction at point P
Factor alpha=y/y'.After obtaining correction coefficient, image is corrected.
3) four kinds of typical flow pattern modelings：The thought for using for reference " segmentation, approximation summation ", establishes bubble flow and slug flow phase respectively
Measurement model containing rate, cyclic annular flow containing rate measurement model, wavy flow containing rate measurement model.
Bubble flow and slug flow containing rate measurement model：Since the hydraulic diameter of passage aisle is smaller, at same section of pipeline
A bubble is only existed simultaneously on face, is not in the case where there are multiple bubbles in same section in conventional pipeline, Ke Yitong
The image for crossing two angles determines the size of bubble in both direction.The case where considering bubble flow and slug flow, in pipeline
It is ellipse by region equivalent shared by gas phase at same section.Within the scope of the axial length in pixels of pipeline, it is believed that shared by gas phase
Area of section it is equal, therefore the gas phase in the segment limit can be equivalent to an Elliptic Cylinder, the Elliptic Cylinder bottom surface is ellipse
The bianry image that round major and minor axis is mutually perpendicular to angle by two respectively determines.Thus, it is possible to by each bubble or slug etc.
Effect is the superposition of several Elliptic Cylinders, you can acquires the volume of each bubble or the corresponding gas phase of vent plug.
As shown in fig. 5, it is assumed that there are n bubble/vent plugs in captured single set of image.I-th of bubble/vent plug length institute
It is l to account for number of pixelsi, pixel shared by the elliptical major and minor axis of bubble section at corresponding j-th of the pixel of i-th of bubble/vent plug
Number is respectively aijWith bij, then the volume V that captured image corresponds to gas phase in pipeline section can be acquiredgas1For：
Wherein, μ is the corresponding physical length of each square pixel, αijFor aijCorresponding correction coefficient, βijFor bijIt is corresponding
Correction coefficient.Then correspond to the phase content ε of bubble flow/slug flow in pipeline section1For：
Wherein, VpipeFor the conduit volume that image taking arrives, L is the duct length that image taking arrives, and D arrives for image taking
Pipe diameter, phase content physical length μ corresponding with pixel is unrelated, and only with pixel shared by each dimensional parameters of two-phase stream picture
Number it is related.
During actual photographed, since length of pipe section taken in viewing field of camera is shorter, calculated by single set of image
Obtained phase content cannot accurately reflect the phase content under current flow pattern.Therefore, the image construction figure being continuously shot by N groups is chosen
As sequence, the average value of image sequence phase content is takenMutually contain as bubble flow/slug flow under corresponding experiment condition
Rate measured value, i.e.,：
Cyclic annular flow containing rate measurement model：It in horizontal pipe, is influenced by gravity, duct bottom liquid film is thicker；
And liquid film is distributed around even tube wall in vertical pipeline.It is similar with slug flow and bubble flow, it, will be in pipeline under annular flow flow pattern
Gas phase is approximately the superposition of several Elliptic Cylinders, and gaseous phase volume can be acquired accordingly, it is hereby achieved that phase content.Such as Fig. 6
It is shown, in acquired annular flow bianry image, number of pixels shared by the elliptical major and minor axis in gas phase section point at ith pixel
It Wei not aiWith bi, then single set of image correspond to pipeline section inner annular flow containing rate ε2For：
Wherein, αiFor aiCorresponding correction coefficient, βiFor biCorresponding correction coefficient.
The N group image construction image sequences being continuously shot are taken, the corresponding phase content of every group of image is calculated, is then averagedAs the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
Wavy flow containing rate measurement model：Under wave flow flow pattern, the volume of gas phase can be by several cylinders in pipeline
Volume is superimposed to obtain.It is different from other three kinds typical flow patterns, due to can be unique after determining height shared by gas phase and liquid phase
Determine the area of section shared by gas phase and liquid phase, therefore the list that the phase content of wave flow can be shot by pipeline side in horizontal pipe
The image of a angle determines.As shown in fig. 7, in acquired wavy stream picture, the height in gas phase section at i-th pixel
For hi, then single image correspond to the volume V of gas phase in pipeline sectiongas3For：
Then single image corresponds to the phase content ε of wave flow in pipeline section3For：
The N width image construction image sequences being continuously shot are taken, the corresponding phase content of each image is calculated, is then averagedAs the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
Using the system and method proposed in the present invention in the horizontal and vertical transparent passage aisle pipeline system that internal diameter is 4.0mm
Phase content measurement experiment has been carried out in system.
The variation range of gas phase flow rate is 6ml/min-41700ml/min, liquid phase changes in flow rate ranging from 6 ml/ in experiment
Min-4170ml/min has been carried out in horizontal pipe under bubble flow, slug flow, annular flow and the typical flow pattern of four kinds of wave flow
Phase content measures, and the phase content that other the three kinds typical flow patterns in addition to wave flow have been carried out in vertical pipeline measures.Using fast
The phase content that pass valve method measures is as calibration value.
As shown in figure 8, (a) figure is the phase content measurement experiment in 4.0mm horizontal pipes as a result, (b) figure is 4.0mm perpendicular
Phase content measurement experiment in straight pipeline is as a result, it can be seen from the figure that the phase content in horizontal and vertical small pipeline measures absolutely
6% is respectively less than to error.The experimental results showed that the passage aisle gas-liquid two-phase flow containing rate proposed by the invention based on more visions
Measuring system and method are feasible, effective.
Claims (4)
1. a kind of phase content measurement method of the passage aisle gas-liquid two-phase flow containing rate measuring system based on more visions, described is
System is by passage aisle pipe-line system (1), more vision high-speed image sampling units (2) and microcomputer (3) composition, passage aisle pipe
Road system (1) is made of the passage aisle (7) being immersed in glycerine slot (6), and more vision high-speed image sampling units (2) are by taking the photograph at a high speed
Camera (9), right-angle prism (8), the first LED light source (4), the second LED light source (5) composition, more vision high-speed image sampling units
It is responsible for while acquires two biphase gas and liquid flow flow images for being mutually perpendicular to angle, by more vision high-speed image sampling unit (2)
The image transmitting collected carries out image procossing to computer (3) and phase content calculates；First LED light source (4) hangs down
It is directly placed in passage aisle (6), the second LED light source (5) is both perpendicular to the first LED light source (5) and passage aisle (6) and with first
In LED light source (5) is generally aligned in the same plane, right-angle prism (8) is located at passage aisle (6) other one relative to the first LED light source (4)
Side, high-speed camera (9) are located at passage aisle (6) other side, a right angle of right-angle prism (8) relative to the second LED light source (5)
While the imaging plane perpendicular to high-speed camera (6)；
It is characterized in that this method comprises the following steps：
1) image is obtained：Using more vision high-speed image sampling units, while obtaining two passage aisle gas for being mutually perpendicular to angle
Liquid two-phase flow image sequence；
2) phase content measurement model is established：Image preprocessing and optic aberrance revising are carried out, four kinds of typical flow patterns are carried out respectively
Modeling；
3) meteor trail echoes：The feature vector of image is extracted, meteor trail echoes are carried out；
4) phase content is calculated：The phase content measurement model of corresponding flow pattern is selected, phase content is calculated.
2. phase content measurement method according to claim 1, it is characterised in that establish phase content in the step 2)
The method of measurement model is specially：
1) image preprocessing：It is pre-processed by the filling of image segmentation, image denoising, edge detection and binaryzation, obtains two
It is worth image；
2) optic aberrance revising：Correction coefficient is obtained by optical path analysis, realizes the correction to bianry image；
3) four kinds of typical flow pattern modelings：Bubble flow is established respectively and slug flow containing rate measurement model, cyclic annular flow containing rate measure
Model, wavy flow containing rate measurement model.
3. phase content measurement method according to claim 1 or 2, it is characterised in that the optical distortion in the step 2)
Bearing calibration is specially：The organic glass cuboid glycerine slot being square using section, pipeline is immersed in glycerine slot, is made
Pipeline center position and the center of cross-sectional square shape coincide, and for object point P (x, y) in pipeline, the light sent out by the point exists
Liquid phase occurs to reflect for the first time with tube wall interface, and occurring second in glycerine groove groove wall and Air Interface reflects, and analysis light path can
Know, the intersection point P'(x', y' of reverse extending line of two adjacent rays sent out by point P after second of refraction) it is P pairs of point
The picture point answered, so that it is determined that correction coefficient alpha=y/y' at point P is corrected bianry image after obtaining correction coefficient.
4. phase content measurement method according to claim 1 or 2, it is characterised in that four kinds of typical cases in the step 3)
Flow pattern modeling method be specially：
1) bubble flow and slug flow containing rate measurement model：Hydraulic diameter in passage aisle is smaller, on the same section of pipeline
A bubble is only existed simultaneously, the size of bubble in both direction can be determined by the image of two angles, considers bubble
Region equivalent shared by gas phase is ellipse at the same section of pipeline by the case where shape stream and slug flow, in the axial picture of pipeline
In plain length range, it is believed that the area of section shared by gas phase is equal, therefore can the gas phase in the segment limit be equivalent to one
Elliptic Cylinder, the bianry image which is mutually perpendicular to angle by two respectively determine, as a result,
Each bubble or slug can be equivalent to the superposition of several Elliptic Cylinders, you can acquire each bubble or vent plug is corresponding
The volume of gas phase,
Assuming that there are n bubble/vent plug in captured single set of image, number of pixels shared by i-th of bubble/vent plug length is li,
Number of pixels shared by the elliptical major and minor axis of bubble section is respectively a at corresponding j-th of the pixel of i-th of bubble/vent plugijWith bij,
The volume V that captured image corresponds to gas phase in pipeline section can then be acquiredgas1For：
Wherein, μ is the corresponding physical length of each square pixel, αijFor aijCorresponding correction coefficient, βijFor bijCorresponding school
Positive coefficient then corresponds to the phase content ε of bubble flow/slug flow in pipeline section1For：
Wherein, VpipeFor the conduit volume that image taking arrives, L is the duct length that image taking arrives, and D is the pipe that image taking arrives
Road diameter, phase content physical length μ corresponding with pixel is unrelated, and only a with pixel shared by each dimensional parameters of two-phase stream picture
Number is related；
During actual photographed, since length of pipe section taken in viewing field of camera is shorter, it is calculated by single set of image
Phase content cannot accurately reflect the phase content under current flow pattern, therefore, choose the image construction image sequence that is continuously shot by N groups
Row, take the average value of image sequence phase contentPhase content as bubble flow/slug flow under corresponding experiment condition is surveyed
Magnitude, i.e.,：
2) cyclic annular flow containing rate measurement model：It in horizontal pipe, is influenced by gravity, duct bottom liquid film is thicker；And
Liquid film is distributed around even tube wall in vertical pipeline, similar with slug flow and bubble flow, under annular flow flow pattern, by gas in pipeline
It is similar for the superposition of several Elliptic Cylinders, gaseous phase volume can be acquired accordingly, it is hereby achieved that phase content, acquired
Annular flow bianry image in, number of pixels shared by the elliptical major and minor axis in gas phase section is respectively a at ith pixeliWith bi, then
Single set of image corresponds to pipeline section inner annular flow containing rate ε2For：
Wherein, αiFor aiCorresponding correction coefficient, βiFor biCorresponding correction coefficient；
The N group image construction image sequences being continuously shot are taken, the corresponding phase content of every group of image is calculated, is then averaged
As the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
3) wavy flow containing rate measurement model：Under wave flow flow pattern, the volume of gas phase can be by the body of several cylinders in pipeline
Product superposition obtains, different from other three kinds typical flow patterns, due to can be uniquely true after determining height shared by gas phase and liquid phase
Determine the area of section shared by gas phase and liquid phase, thus in horizontal pipe the phase content of wave flow can be shot by pipeline side it is single
The image of angle determines, in acquired wavy stream picture, the height in gas phase section is h at ith pixeli, then single width figure
As the volume V of gas phase in corresponding pipeline sectiongas3For：
Then single image corresponds to the phase content ε of wave flow in pipeline section3For：
The N width image construction image sequences being continuously shot are taken, the corresponding phase content of each image is calculated, is then averaged
As the measured value of cyclic annular flow containing rate under corresponding experiment condition, i.e.,：
Priority Applications (1)
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