CN110119581A - A kind of electromagnetism sensor of water meter construction design method improving Small flowrate measurement performance - Google Patents
A kind of electromagnetism sensor of water meter construction design method improving Small flowrate measurement performance Download PDFInfo
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Abstract
The present invention relates to a kind of electromagnetism sensor of water meter construction design methods for improving Small flowrate measurement performance, it include: to establish weight function numerical model, weight function analysis is carried out to measurement pipeline of different shapes, determine the measurement pipeline of optimum shape, and the further relationship of the uniformity and pipeline configuration size of the distribution of analysis weight function；Then, the crushing numerical model for establishing electromagnetism water meter carries out crushing analysis to the measurement pipeline of different structure size, under conditions of meeting national standard crushing requirement, according to the uniformity that weight function is distributed, determines the measurement pipeline of optimum structure size；Finally, establishing the induced electromotive force numerical model of electromagnetism water meter, different magnetic structures are compared and analyzed, determine optimal magnetic structure, finally obtain the electromagnetism water meter of optimum structure parameter.The present invention can obtain strongest induced electromotive force under conditions of low-power consumption, to improve the measurement performance of the small flow of electromagnetism water meter.
Description
Technical field
The present invention relates to electromagnetism sensor of water meter structure-design technique fields, more particularly, to a kind of raising Small flowrate measurement
The electromagnetism sensor of water meter construction design method of performance.
Background technique
Electromagnetism water meter has many advantages, such as that measurement range is wide, initial-flow is small, measurement accuracy is high, long service life, widely
Water utilities industry applied to city.Electromagnetism water meter generallys use internal battery and is powered, in order to guarantee that it is longer that battery has
Service life, exciting current is usually smaller, so the magnetic field in sensor is fainter.When the inlet flow rate of electromagnetism water meter measurement
When smaller, the induced electromotive force very little of sensor at this time, signal-to-noise ratio is very low, and measuring accuracy is deteriorated, or even is unable to measure.Usually
In the case of, if to improve the measurement performance of the small flow of electromagnetism water meter, has to improve exciting current, enhance magnetic field strength.
But this will increase the excitation power consumption of sensor, that shortens battery uses the time, while needing to be replaced frequently battery, expends a large amount of
Man power and material.Therefore, it is necessary to the structures to sensor to optimize, and realize electromagnetism water meter sense under conditions of low-power consumption
Answer the enhancing of electromotive force.
According to the expression formula of electromagnetism water meter induced electromotive force, the induced electromotive force of sensor not only point with flow field and magnetic field
Cloth is related, also related with the weight function in sensor.Existing literature is when the weight function to sensor is researched and analysed, mainly
It is to be directed to circular pipe flowmeter, it is less to the weight function research of other shapes pipeline.Existing literature is studied in stream field
When analysis, it is determined that can be improved the flow rate of liquid in sensor using the measurement pipeline of indented style.It is retracted section part simultaneously
Velocity flow profile is uniform, is conducive to the precise measurement of small flow.But the crushing that indented style measurement pipeline generates is larger, pertinent literature
The measurement pipeline that optimum structure parameter is obtained how under conditions of meeting crushing requirement is not discussed in detail.Existing literature exists
When researching and analysing of magnetic field is carried out, discovery can be improved the magnetic field strength in sensor using ferromagnetic material, to enhance induction
Electromotive force, but the relationship without analyzing induced electromotive force and magnetic structure, can not determine optimal magnetic structure.So in order to
Enhance the induced electromotive force of electromagnetism sensor of water meter under identical consumption conditions, improve the measurement performance of the small flow of electromagnetism water meter,
It needs to carry out system research in terms of weight function, flow field and magnetic field three.
Summary of the invention
It is an object of the invention to propose a kind of electromagnetism sensor of water meter structure design side for improving Small flowrate measurement performance
Method, to improve the measurement performance of the small flow of electromagnetism water meter under conditions of low-power consumption.
To achieve the above object, the invention adopts the following technical scheme: a kind of electromagnetism improving Small flowrate measurement performance
Sensor of water meter construction design method, this method include the steps that following order:
(1) it is based on finite element numerical analysis software, establishes weight function numerical model；
(2) it is based on weight function numerical model, measurement pipeline of different shapes to electromagnetism water meter carries out weight function analysis, determines
The electromagnetism water meter of optimum shape measures pipeline；
(3) it is based on weight function numerical model, the uniformity of weight function distribution and measurement pipeline configuration ruler in analyte sensors
Very little relationship；
(4) it is based on finite element numerical analysis software, establishes the crushing numerical model of electromagnetism water meter；
(5) it is based on crushing numerical model, crushing analysis is carried out to the measurement pipeline of electromagnetism water meter different structure size；
(6) under conditions of meeting national standard crushing requirement, according to the uniformity that weight function is distributed, optimum structure size is determined
Measurement pipeline；
(7) it is based on finite element numerical analysis software, establishes the induced electromotive force numerical model of electromagnetism water meter；
(8) it is based on induced electromotive force numerical model, the magnetic structure of electromagnetism water meter Different structural parameters is compared point
Analysis, determines optimal magnetic structure, finally obtains the electromagnetism water meter of optimum structure parameter.
The step (1) specifically refers to:
1) current model is selected in AC/DC module, presetting research type is stable state；
2) in geometry setting, limit element artificial module is established according to the geometry of electromagnetism water meter, and point electrode is set
Structure size；
3) sensor material parameter is set in material options, and electrode material is set as metallic copper, and conducting liquid is water；
4) apply boundary condition in current model, measurement inside pipe wall meets electrical isolation boundary condition with insulation liningLeft and right electrode applies voltage respectively；
5) grid division in grid setting；
6) calculating solution is carried out under study for action, and solver type is stable state solver；
7) it calculates after solving, data is post-processed in result option；
8) electric field strength of center is calculated first, then obtains the electric field intensity value in sensor at each point,
And it is distributed divided by the electric field strength of center to get to the weight function after normalization.
The step (2) specifically refers to:
Weight function numerical model based on foundation, measurement pipeline of different shapes to electromagnetism water meter carry out weight function analysis,
According to the uniformity of weight function distribution map and weight function distribution in sensor, determine that weight function is distributed most uniform measurement pipe
Road obtains the electromagnetism water meter measurement pipeline of optimum shape.
The step (3) specifically refers to:
Based on weight function numerical model, pipeline is measured according to obtained optimum shape electromagnetism water meter, analyzes different measurement pipes
When road structure size, the uniformity of weight function distribution obtains weight function distributing homogeneity and measures the relationship of pipeline structure size.
The step (4) specifically refers to:
1) threedimensional model of electromagnetism water meter structure is constructed, and the straight pipeline of certain length is set before and after sensor；
2) geometrical model is imported into grid dividing software, carries out grid dividing, and inlet porting, outlet and wall surface side
Boundary's condition；
3) calculating solution is carried out using finite element analysis software, selects Realizable k- ε two-equation turbulence model；Enter
Pig's tongue part is set as speed entrance, and exit condition is set as free discharge, and wall roughness is arranged in wall condition；
4) calculated result is analyzed using the poster processing soft, acquires total crushing of sensor and straight pipeline；
5) it repeats the above steps, emulation is solved there is no straight pipeline crushing when electromagnetism water meter, and the two crushing difference is state
Electromagnetism water meter crushing under the conditions of mark.
The step (5) specifically refers to:
According to the common flow measurement range of electromagnetism water meter, the inlet flow rate of sensor is determined；Based on crushing numerical model,
Crushing analysis is carried out to the electromagnetism water meter of different structure size.
The step (6) specifically refers to:
The relationship for analyzing electromagnetism water meter crushing size and weight function distributing homogeneity and sensor structure size, is meeting state
Under conditions of marking crushing requirement, optimal measurement pipeline structural parameters are determined.
The step (7) specifically refers to:
1) turbulent flow k- ε model is selected in fluid flow module, presetting research type is stable state；
2) length unit is defaulted as mm, in geometry setting, establishes finite element simulation according to the geometry of electromagnetism water meter
Model；
3) sensor material parameter is set in material options；
4) it in turbulence model, selects to solve domain to be fluid mass, and inlet porting, outlet and wall boundary condition；
5) magnetic field and electric field model are added, selects to solve domain to be entire space, fluid mass boundary condition is set as ampere
Law and electric current conservation, remaining region meet Ampere's law；Coil is set as coil boundary condition, and coil stimulating mode is electric current
Excitation；Speed (Lorentz item) is set and couples velocity field, flow field simulation result is coupled in magnetic field and electric field model and is counted
It calculates and solves；Then setting ground connection boundary condition, assigning potential size in specified location is 0；
6) free tetrahedral grid is added, solves domain grid division to entire；
7) solution calculating is carried out to turbulence model, and saves result；
8) carry out solution calculating to magnetic field and electric field model, and add step 1: coil geometrical analysis saves knot after calculating
Fruit；
9) calculated result is post-processed, the average potential of left and right electrode surface is calculated separately in derived value, calculated
The difference of average potential obtains induced electromotive force.
The step (8) specifically refers to:
Based on induced electromotive force numerical model, the induced electromotive force of electromagnetism water meter is big when analyzing different magnetic structure parameters
Small, induced electromotive force is stronger, and magnetic structure is more excellent, determines optimal magnetic structure parameter, finally obtains optimum structure parameter
Electromagnetism water meter.
As shown from the above technical solution, the beneficial effects of the present invention are: by electromagnetism water meter different shape pipeline
Weight function is researched and analysed, and be can determine the minimum pipeline configuration of convection distribution dependence, is conducive to high-acruracy survey；And
Further weight function distributing homogeneity and the relationship of measurement pipeline are researched and analysed, are that the sensor structure of electromagnetism water meter is excellent
Change design and theoretical foundation is provided.Then, according to the electromagnetism water meter of optimum shape measure pipeline, analyze different sensors structure when
Crushing size.Under conditions of meeting national standard crushing requirement, according to the uniformity of weight function distribution, optimum structure parameter is determined
Measure pipeline.Finally, being based on optimal measurement pipeline, a kind of induced electromotive force numerical model for coupling flow field and magnetic field is established, with
Induced electromotive force size is evaluation index, optimal magnetic structure parameter is determined, so that it is determined that optimal electromagnetism sensor of water meter
Structural parameters.This method can guarantee to obtain strongest induced electromotive force under conditions of power consumption is certain, to improve electromagnetism water
The measurement performance of the small flow of table.
Explanation
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is the weight function distribution map of circular pipe；
Fig. 3 is square the weight function distribution map of pipeline；
Fig. 4 is the weight function distribution map of octagon pipeline；
Fig. 5 is the weight function distribution map of rectangular duct；
Fig. 6 is sensor geometries schematic diagram；
Fig. 7 is 1 induced electromotive force distribution map of magnetic circuit；
Fig. 8 is 2 induced electromotive force distribution map of magnetic circuit；
Fig. 9 is 3 induced electromotive force distribution map of magnetic circuit；
In figure: 1- measures pipeline, 2- coil, 3- iron core, 4- pole plate, 5- magnetic yoke, 6- electrode.
Specific embodiment
With reference to the accompanying drawing to a kind of electromagnetism sensor of water meter structure for improving Small flowrate measurement performance proposed by the present invention
Design method is further explained and illustrates.
Herein by taking DN100 electromagnetism water meter as an example, Fig. 1 is flow chart of the invention, the specific steps are as follows:
(1) it is based on finite element numerical analysis software, establishes weight function numerical model.
Based on COMSOL Multiphysics finite element numerical analysis software, the step of constructing weight function numerical model, is such as
Under:
1) current model is selected in AC/DC module, simulation model is two dimension, and presetting research type is stable state；
2) in geometry setting, limit element artificial module is established according to the geometry of electromagnetism water meter, and point electrode is set
Structure size, point electrode radius are 0.4mm；
3) sensor material parameter is set in material options, and electrode material is set as metallic copper, and conducting liquid is water；
4) apply boundary condition in current model, measurement inside pipe wall meets electrical isolation boundary condition with insulation liningLeft and right electrode applies the voltage of 1V, -1V respectively；
5) grid division in grid setting, in order to guarantee the accuracy of simulation result, selection pole tessellated mesh；
6) calculating solution is carried out under study for action, and solver type is stable state solver；
7) it calculates after solving, data is post-processed in result option；
8) electric field strength of center is calculated first, then obtains the electric field intensity value in sensor at each point,
And it is distributed divided by the electric field strength of center to get to the weight function after normalization.
(2) it is based on weight function numerical model, measurement pipeline of different shapes to electromagnetism water meter carries out weight function analysis, determines
The electromagnetism water meter of optimum shape measures pipeline.
Weight function numerical model based on foundation, measurement pipeline of different shapes to electromagnetism water meter carry out weight function analysis,
And the uniformity of weight function distribution in sensor is quantitatively calculated using formula (1).
WkIndicate the weight function value in sensor at different location, W0For the average value of weight function in sensor.
The weight function distribution of analysis circle, square, octagon and rectangle retraction pipeline respectively, is arranged different shape pipeline
Consistent area be 1963mm2.Then circular pipe radius is 25mm, and square pipe side length is 44.3mm, octagonal tube roadside
A length of 20.2mm, a height of 80 × 24.5mm of rectangular tube road width.And using formula (1) calculate separately round, square, octagon and
The uniformity of rectangular duct weight function distribution, as shown in table 1.
The uniformity of 1 different shape pipeline weight function of table
| Pipeline configuration | R |
| It is round | 1.5786 |
| Square | 1.7167 |
| Octagon | 1.6469 |
| Rectangle | 1.3401 |
By table 1 it is found that the distribution of rectangular duct weight function is most uniform.Round, square, octagon and rectangular duct weigh letter
Number distribution map is respectively as shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5.For the ease of comparison, weight function equipotential lines size since 0, with
0.25 is incremented to 30 for step-length.As seen from the figure, rectangular duct weight function equipotential lines spacing is maximum, and weight function distributing homogeneity is most
Good, i.e., rectangular duct is that the electromagnetism water meter of optimum shape measures pipeline.
(3) it is based on weight function numerical model, the uniformity of weight function distribution and measurement pipeline configuration ruler in analyte sensors
Very little relationship.
Based on weight function numerical model, uniformity and the measurement pipe road width for analyzing rectangle retraction pipeline weight function distribution are high
Relationship calculates the uniformity of weight function distribution in sensor by formula (1), as shown in table 2.
The weight function of 2 Different structural parameters of table compares
| R | H=20mm | H=25mm | H=30mm | H=35mm | H=40mm | H=45mm | H=50mm |
| W=55mm | 1.1906 | 1.3296 | 1.4262 | 1.5471 | 1.6436 | 1.7267 | 1.8391 |
| W=60mm | 1.2147 | 1.3320 | 1.4464 | 1.5513 | 1.6435 | 1.7366 | 1.8262 |
| W=65mm | 1.2199 | 1.3375 | 1.4442 | 1.5517 | 1.6498 | 1.7415 | 1.8272 |
| W=70mm | 1.2170 | 1.3503 | 1.4633 | 1.5355 | 1.6478 | 1.7345 | 1.8666 |
| W=75mm | 1.2241 | 1.3335 | 1.4584 | 1.5510 | 1.6525 | 1.7432 | 1.8253 |
| W=80mm | 1.2401 | 1.3548 | 1.4807 | 1.5528 | 1.6550 | 1.7771 | 1.8202 |
By table 2 it is found that the uniformity of weight function distribution becomes in sensor as rectangle is retracted the variation of duct width w
Change unobvious, i.e. the uniformity influence that be distributed on weight function of rectangle retraction duct width is smaller.As rectangle is retracted duct height h
Reduction, the uniformity of weight function distribution is become better and better in sensor.
(4) it is based on finite element numerical analysis software, establishes the crushing numerical model of electromagnetism water meter.
Based on ANSYS Fluent finite element numerical analysis software, the step of constructing crushing numerical model, is as follows:
1) threedimensional model of Pro/E software building rectangle indented style electromagnetism water meter structure is used, and before sensor
Respectively there are the straight pipeline of 20D and 40D afterwards, modeling result saves as the geometry file of .igs format.
2) grid dividing, inlet porting, outlet and wall surface perimeter strip are carried out using Fluent pre-processing software ICEM CFD
Part.Hexahedral mesh is created using bottom-up approach, and guarantees to solve in tube wall boundary and Sensor section refined net
Precision.
3) emulation solution is carried out using Fluent software, selects Realizable k- ε two-equation turbulence model.Entrance side
Boundary's condition setting is speed entrance, and velocity magnitude is set as 3.537m/s, turbulence intensity 3.245%, and hydraulic diameter is
100mm.Exit condition is set as free discharge, and sensor tube wall roughness height is set as 0.008mm, front and back straight pipeline wall surface
Roughness height is set as 0.46mm.Discrete solution is carried out to governing equation using SIMPLEC algorithm.
4) simulation result is post-processed using CFD-POST software, respectively at the preceding 10D of sensor and the rear position 20D
Section is set, and value of pressure loss is the difference of the pressure in section at front and back two.
5) it repeats the above steps, emulation solves straight pipeline crushing when rectangle indented style electromagnetism water meter is not present, the two pressure
Damage difference is the electromagnetism water meter crushing under the conditions of national standard.
(5) it is based on crushing numerical model, crushing analysis is carried out to the measurement pipeline of electromagnetism water meter different structure size.
The economic velocity of electromagnetism water meter is generally 3m/s, so being directed to DN100 electromagnetism water meter, common flow set is
100m3/ h, so the inlet flow rate of sensor is set as 3.537m/s.Based on crushing numerical model, different structure size is calculated
The crushing size of electromagnetism water meter.Since the height and width of rectangle indented style electromagnetism water meter are smaller, the crushing of sensor is bigger, long
Spend smaller, crushing is smaller.So being highly the bigger the better with width, length is the smaller the better to reduce the crushing size of sensor.
Due to rectangle indented style electromagnetism water meter need lesser height guarantee weight function distribution uniformity.So rectangle retraction section
Width is maximized, and length is minimized.For DN100 electromagnetism water meter, width direction needs to place the fixed electrode of stud, in order to
Reduce the size of sensor, width maximum value is 80mm.Rectangle retraction section needs to place magnet exciting coil for generating magnetic field, length
Cannot be too small, length minimum value is 80mm.Crushing and flow rate result such as 3 institute of table of rectangle indented style electromagnetism water meter different height
Show.
3 flow field simulation result of table
(6) under conditions of meeting national standard crushing requirement, according to the uniformity that weight function is distributed, optimum structure size is determined
Measurement pipeline.
The relationship for analyzing electromagnetism water meter crushing size and weight function distributing homogeneity and sensor structure size, is meeting state
Under conditions of marking crushing requirement, optimal measurement pipeline structural parameters are determined.
By the analysis of table 2 and table 3 it is found that the height of rectangle indented style electromagnetism water meter is smaller, the liquid flow in sensor
Speed is bigger, is more conducive to the precise measurement of small flow, and the weight function distributing homogeneity in sensor is better, convection distribution
Dependence is lower, but the crushing of sensor is also increasing.So highly being got under conditions of meeting national standard crushing requirement
It is small better.National standard crushing is dimensioned to 40KPa, therefore optimal measurement pipe road a height of 80 × 80 × 25mm of length and width.
(7) it is based on finite element numerical analysis software, establishes the induced electromotive force numerical model of electromagnetism water meter.
1) turbulent flow k- ε model is selected in fluid flow module, presetting research type is stable state；
2) length unit is defaulted as mm, in geometry setting, establishes finite element simulation according to the geometry of electromagnetism water meter
Model, as shown in Figure 6；
3) sensor material parameter is set in material options, and measurement pipeline 1 is non-conducting material, and conductivity is 1 × 10-11S/m, electrode 6 are conductor, and conductivity is 1.25 × 106S/m, iron core 3, pole plate 4, magnetic yoke 5 play magnetic conduction, relative permeability
It is set as 2000；
4) it in turbulence model, selects to solve domain to be fluid mass, and inlet porting, outlet and wall boundary condition；Enter
Mouth velocity magnitude is set as 1m/s, turbulence intensity 0.038, and turbulent flow length is 0.07 × 0.1m, and exit condition is pressure export, pressure
Power size is 0Pa, and inhibits reflux；
5) magnetic field and electric field model are added, selects to solve domain to be entire space, fluid mass boundary condition is set as ampere
Law and electric current conservation, remaining region meet Ampere's law；Coil 2 is set as coil boundary condition, and coil stimulating mode is electricity
Stream excitation, size of current 20mA, coil turn are 1333 circles；Speed (Lorentz item) is set and couples velocity field, flow field is imitated
True result, which is coupled in magnetic field and electric field model, carries out calculating solution；Then setting ground connection boundary condition is assigned in specified location
Giving potential size is 0；
6) free tetrahedral grid is added, solves domain grid division to entire；
7) solution calculating is carried out to turbulence model, and saves result；
8) carry out solution calculating to magnetic field and electric field model, and add step 1: coil geometrical analysis saves knot after calculating
Fruit；
9) calculated result is post-processed, the average potential of left and right electrode surface is calculated separately in derived value, calculated
The difference of average potential obtains induced electromotive force.
(8) it is based on induced electromotive force numerical model, the magnetic structure of electromagnetism water meter Different structural parameters is compared point
Analysis, determines optimal magnetic structure, finally obtains the electromagnetism water meter of optimum structure parameter.
Based on induced electromotive force numerical model, the induced electromotive force of electromagnetism water meter is big when analyzing different magnetic structure parameters
It is small；Respectively analyte sensors magnetic structure only contain magnetic yoke 5, containing magnetic yoke 5 and iron core 3, containing magnetic yoke 5 and iron core 3 and pole plate 4
Deng three kinds of magnetic structures, three kinds of magnetic structures are named as magnetic circuit 1, magnetic circuit 2 and magnetic circuit 3, the induction of three kinds of magnetic structures respectively
Electromotive force result difference is as shown in Figure 7, Figure 8 and Figure 9, and as seen from the figure, the induced electromotive force of magnetic circuit 3 is most strong, i.e. Small flowrate measurement
Performance is best.
Claims (9)
1. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance, it is characterised in that: this method packet
The step of including following order:
(1) it is based on finite element numerical analysis software, establishes weight function numerical model；
(2) it is based on weight function numerical model, measurement pipeline of different shapes to electromagnetism water meter carries out weight function analysis, determine optimal
The electromagnetism water meter of shape measures pipeline；
(3) it is based on weight function numerical model, the uniformity of weight function distribution and measurement pipeline structure size in analyte sensors
Relationship；
(4) it is based on finite element numerical analysis software, establishes the crushing numerical model of electromagnetism water meter；
(5) it is based on crushing numerical model, crushing analysis is carried out to the measurement pipeline of electromagnetism water meter different structure size；
(6) under conditions of meeting national standard crushing requirement, according to the uniformity that weight function is distributed, the survey of optimum structure size is determined
Buret road；
(7) it is based on finite element numerical analysis software, establishes the induced electromotive force numerical model of electromagnetism water meter；
(8) it is based on induced electromotive force numerical model, the magnetic structure of electromagnetism water meter Different structural parameters is compared and analyzed, really
Fixed optimal magnetic structure, finally obtains the electromagnetism water meter of optimum structure parameter.
2. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (1) specifically refers to:
1) current model is selected in AC/DC module, presetting research type is stable state；
2) in geometry setting, limit element artificial module is established according to the geometry of electromagnetism water meter, and point electrode arrangement is set
Size；
3) sensor material parameter is set in material options, and electrode material is set as metallic copper, and conducting liquid is water；
4) apply boundary condition in current model, measurement inside pipe wall meets electrical isolation boundary condition with insulation liningLeft and right electrode applies voltage respectively；
5) grid division in grid setting；
6) calculating solution is carried out under study for action, and solver type is stable state solver；
7) it calculates after solving, data is post-processed in result option；
8) electric field strength of center is calculated first, then obtains the electric field intensity value in sensor at each point, and remove
It is distributed with the electric field strength of center to get to the weight function after normalization.
3. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (2) specifically refers to:
Weight function numerical model based on foundation, measurement pipeline of different shapes to electromagnetism water meter carry out weight function analysis, according to
The uniformity of weight function distribution map and weight function distribution in sensor, determines that weight function distribution most uniformly measures pipeline, obtains
Electromagnetism water meter to optimum shape measures pipeline.
4. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (3) specifically refers to:
Based on weight function numerical model, pipeline is measured according to obtained optimum shape electromagnetism water meter, analyzes different measurement pipeline knots
When structure size, the uniformity of weight function distribution obtains weight function distributing homogeneity and measures the relationship of pipeline structure size.
5. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (4) specifically refers to:
1) threedimensional model of electromagnetism water meter structure is constructed, and the straight pipeline of certain length is set before and after sensor；
2) geometrical model is imported into grid dividing software, carries out grid dividing, and inlet porting, outlet and wall surface perimeter strip
Part；
3) calculating solution is carried out using finite element analysis software, selects Realizable k- ε two-equation turbulence model；Enter pig's tongue
Part is set as speed entrance, and exit condition is set as free discharge, and wall roughness is arranged in wall condition；
4) calculated result is analyzed using the poster processing soft, acquires total crushing of sensor and straight pipeline；
5) it repeats the above steps, emulation is solved there is no straight pipeline crushing when electromagnetism water meter, and the two crushing difference is national standard item
Electromagnetism water meter crushing under part.
6. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (5) specifically refers to:
According to the common flow measurement range of electromagnetism water meter, the inlet flow rate of sensor is determined；Based on crushing numerical model, to not
Electromagnetism water meter with structure size carries out crushing analysis.
7. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (6) specifically refers to:
The relationship for analyzing electromagnetism water meter crushing size and weight function distributing homogeneity and sensor structure size, is meeting national standard pressure
Under conditions of damage requires, optimal measurement pipeline structural parameters are determined.
8. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (7) specifically refers to:
1) turbulent flow k- ε model is selected in fluid flow module, presetting research type is stable state；
2) length unit is defaulted as mm, in geometry setting, establishes limit element artificial module according to the geometry of electromagnetism water meter；
3) sensor material parameter is set in material options；
4) it in turbulence model, selects to solve domain to be fluid mass, and inlet porting, outlet and wall boundary condition；
5) magnetic field and electric field model are added, selects to solve domain to be entire space, fluid mass boundary condition is set as Ampere's law
With electric current conservation, remaining region meets Ampere's law；Coil is set as coil boundary condition, and coil stimulating mode swashs for electric current
It encourages；Speed (Lorentz item) is set and couples velocity field, flow field simulation result is coupled in magnetic field and electric field model and is calculated
It solves；Then setting ground connection boundary condition, assigning potential size in specified location is 0；
6) free tetrahedral grid is added, solves domain grid division to entire；
7) solution calculating is carried out to turbulence model, and saves result；
8) carry out solution calculating to magnetic field and electric field model, and add step 1: coil geometrical analysis saves result after calculating；
9) calculated result is post-processed, the average potential of left and right electrode surface is calculated separately in derived value, calculated average
The difference of potential obtains induced electromotive force.
9. a kind of electromagnetism sensor of water meter construction design method for improving Small flowrate measurement performance according to claim 1,
It is characterized by: the step (8) specifically refers to:
Based on induced electromotive force numerical model, the induced electromotive force size of electromagnetism water meter when analyzing different magnetic structure parameters, sense
Answer electromotive force stronger, magnetic structure is more excellent, determines optimal magnetic structure parameter, finally obtains the electromagnetism water of optimum structure parameter
Table.
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