CN105067049B  A kind of differential pressure type flow meter and method based on eddy flow principle  Google Patents
A kind of differential pressure type flow meter and method based on eddy flow principle Download PDFInfo
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 CN105067049B CN105067049B CN201510431506.2A CN201510431506A CN105067049B CN 105067049 B CN105067049 B CN 105067049B CN 201510431506 A CN201510431506 A CN 201510431506A CN 105067049 B CN105067049 B CN 105067049B
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Abstract
A kind of differential pressure type flow meter and method based on eddy flow principle, include the pipeline of an a diameter of D, it is provided with and is fitted closely with tube wall and the cyclone of static arrangement in pipeline, the pipeline in cyclone downstream is provided with tube wall pressure pipe and tube hub pressure pipe, and the outlet of tube wall pressure pipe and tube hub pressure pipe is connected with two fluid inlets of differential pressure transmitter respectively；The present invention acquires mean flow rate by measuring the pressure difference of same level, flow and traditional differential pressure flowmeter are acquired further according to mean flow rate comparatively, required straight pipe greatly shortens, pressure difference also greatly reduces, and has fabulous adaptability to the case where rotational flow and vortex；For heterogeneous fluid, complicated heterogeneous fluid can be rectified into pipe symmetric about the axis " being mutually separated " state by swirlflow devices, be measured to easily facilitate.
Description
Technical field
The invention belongs to fluid measurement technical fields, and in particular to a kind of differential pressure type flow measurement dress based on eddy flow principle
It sets and method.
Background technology
In field of flow measurement, differential pressure flowmeter account for flowmeter sum 1/3 or more, no matter from developing history, application
For range with from the point of view of usage quantity, it is all undisputed first major class flowmeter.Currently, common differential pressure flowmeter is divided into two
Major class：Throttle type and flow around type.Throttle type include standard type (orifice plate, nozzle and Venturi tube) and it is nonstandard (slotted orifice plate,
Porous plate, 1/4 orifice plate, bend pipe, conical entrance orifice plate etc.).Flow around type includes annular oriffice, circular passage (Vtype inner cone, conduit
Formula etc.), even speed tube etc..
The advantages of standard orifice plate throttling set is simple in structure, application technology is ripe, product has been carried out standardization, is mesh
The preceding widest flow instrument of commercial Application；But its shortcomings that, is also very much：Permanent compression loss it is excessive, installation when require up and down
Trip has longer straight pipe, range ratio narrow, and only 3:1, verge of opening passivation can make its accuracy decline, fluid stream through throttling
A fluid stream must be parallel with conduit axis and must not have rotating flow etc. before device.Although nozzle and venturi are in same traffic and β value
When Pressure Loss Ratio orifice plate want low 30%~50%, but nozzle and venturi are expensive, and structure is more complex.
Elbow meter be using the differential pressure flowmeter of side pressure difference measurements flow inside and outside bend pipe, it the advantages of be spend at
This relatively low, easy installation and use, the disadvantage is that the interference of Secondary Flow is susceptible to, since discharge coefficient is joined by bend pipe structure size
The influence of number R/D is very sensitive, so being not easily accomplished very much standardization.
Measurement for multiphase flow rate, elbow meter cannot achieve, and due to the flow operating mode of twophase fluid complexity
Property, orifice plate, nozzle, venturi can not borrow unified empirical equation, generally be measured using combined method, such as Li Yuxing
The dual grooved orifice plate combination of equal propositions, Venturi tubevortexshedding meter combination, Chenquan Hua's of Zhiqiang Sun etc.
The orifice plate or Venturi tube of the propositions such as slotted orifice platevortex precession flowmeter combination, C.H.Hongcritical flow nozzle combination, Shunpei
The Venturi tube of the propositions such as Yamazakilaminar flow flowmeter combination etc., these methods can work normally in a certain range,
And once exceeding its measurement range, flow signal will be submerged in strong " noise ", and measurement error increased dramatically very therewith
It cannot extremely work.
Invention content
In order to overcome the abovementioned deficiencies of the prior art, it is an object of the invention to propose a kind of difference based on eddy flow principle
Pressure type flow measuring device and method, the required straight pipe of the present invention greatly shorten, and pressure difference also greatly reduces, and to rotating flow
, there is fabulous adaptability in the case where dynamic and vortex；For heterogeneous fluid, complicated heterogeneous fluid can be rectified by swirlflow devices
It " is mutually separated " state in pipe symmetric about the axis, is measured to easily facilitate, the only letter measured due to influencing such method
Single cyclone, so compared to for other nonstandard differential pressure flowmeters, such method and apparatus are easier realization standard
Change.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of differential pressure type flow meter based on eddy flow principle includes the pipeline 7 of an a diameter of D, is set in pipeline 7
It is equipped with and is fitted closely with tube wall and the cyclone of static arrangement 2, the pipeline in 2 downstream of cyclone is provided with tube wall pressure pipe 4 and pipe
Center pressure pipe 5, tube wall pressure pipe 4 and tube hub pressure pipe 5 outlet respectively with two fluid inlet phases of differential pressure transmitter 6
Connection.
The cyclone 2 is located at the downstream of entrance 1, and distance between the two is not less than 2D.
The cyclone 2 is located at the upstream of pipe outlet 3, and distance between the two is not less than 2D.
The tube wall pressure pipe 4 and tube hub pressure pipe 5 are located at 2 downstream 2D~10D of cyclone, tube wall pressure pipe 4
The pressure tappings of axis and tube hub pressure pipe 5 are located at same level.
A diameter of 0.5~the 2.0mm of pressure port at the tube wall pressure pipe 4 and tube hub pressure pipe 5.
The axis of pressure port is vertical with tube wall at the tube wall pressure pipe 4.
The pressure port axis direction of the tube hub pressure pipe 5 is identical with flow direction.
A kind of differential pressure type flow measurement method based on eddy flow principle, includes the following steps：
Step 1: when fluid flows through the cyclone 2 in pipeline 7, since fluid is by the constraint of cyclone 2, stream is forced
Body generates vortex flow according to the shape of cyclone 2, and fluid is rotated around tube hub axis, the flow further downstream in rotation, flowing
Track is approximately a helix, and the centrifugal force that fluid generates makes fluid generate pressure difference, tube wall pressure pipe 4 in tube wall and tube hub
Take out the static pressure of tube wall and tube hub respectively with tube hub pressure pipe 5, the pressure difference of the two is measured by differential pressure transmitter 6；
Step 2: for cyclone 2, a certain cross section tube wall and tube hub after the size and cyclone 2 of fluid flow
Pressure difference takes the infinitesimal fluid of a certain cross section, the centrifugal force of unit mass micro unit to be there are certain relationshipIt should be with pressure
Force gradient balances each other, i.e.,：
By INTEGRAL THEOREM OF MEAN it is found that there is always a radius r^{*}, the tangential flow velocity at this can represent the tangential of the section
Mean flow rateThen formula (1) pair radius is integrated from 0R：
In formulaAnd r^{*}The tangential mean flow rate and the corresponding mean radius of mean flow rate, R for respectively representing section represent pipeline
Internal diameter；
Step 3: since fluid is by being to do rotation to move upwards after cyclone, it is axial flat if cyclone is certain
Equal flow velocity and the tangential mean flow rate in some section certainly exist a fixed proportionate relationship, and the tangential mean flow rate with
1/2 power of pressure difference is linear, that is to say, that 1/2 time of axial mean flow rate and some section tube wall and tube hub pressure difference
Side is linear：
In formula, α represents discharge coefficient, and related with pipe diameter, sectional position, value is obtained by experimental calibration；Δ P tables
Show the pressure drop between pipeline center and tube wall when fluid media (medium) flows through a certain section；ρ indicates Media density；
Step 4: for monophasic fluid, according to formulaAcquire the flow of fluid；For heterogeneous fluid, lead to
The axial mean flow rate for crossing each phase is multiplied by the actual internal area of corresponding each phase, you can obtains the flow of each phase.
The present invention measuring principle be：
For cyclone, the pressure differential deltap P of a certain cross section upper tube wall and tube hub after the size and cyclone of fluid flow
There are certain relationships, by simulation and experimental verification it is found that axial mean flow rateWith the section tube wall and tube hub pressure differential deltap P
1/2 power is linear, and remoter from cyclone, and discharge coefficient α is bigger；Therefore it only needs in advance to specific cyclone knot
Structure is demarcated, according to the pressure difference in a certain section after the cyclone measured, you can obtains the axial mean flow rate of pipeline, in turn
Learn the flow of fluid.
Advantages of the present invention：
Comparatively, required straight pipe greatly shortens, pressure difference also greatly subtracts for the present invention and traditional differential pressure flowmeter
It is small, and have fabulous adaptability to the case where rotational flow and vortex；For heterogeneous fluid, swirlflow devices can be by complexity
Heterogeneous fluid is rectified into pipe symmetric about the axis " being mutually separated " state, is measured to easily facilitate, due to influencing such side
What method measured is only simple cyclone, so compared to for other nonstandard differential pressure flowmeters, such method and apparatus
More easily realize standardization.
Description of the drawings
Fig. 1 is the device of the invention structural schematic diagram.
Fig. 2 is the relational graph of axial mean flow rate and tube wall and 1/2 power of tube hub pressure difference.
When Fig. 3 is biphase gas and liquid flow (gas flow 2L/min), 1/2 time of water phase flow and tube wall and tube hub pressure difference
The relational graph of side.
Specific implementation mode
The present invention will be described in more detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of differential pressure type flow meter based on eddy flow principle, includes the pipeline of an a diameter of D
7, it is provided in pipeline 7 and is fitted closely with tube wall and the cyclone of static arrangement 2, the pipeline in 2 downstream of cyclone are provided with tube wall
Pressure pipe 4 and tube hub pressure pipe 5, tube wall pressure pipe 4 and tube hub pressure pipe 5 outlet respectively with differential pressure transmitter 6 two
A fluid inlet is connected.
The cyclone 2 is located at the downstream of entrance 1, and distance between the two is not less than 2D.
The cyclone 2 is located at the upstream of pipe outlet 3, and distance between the two is not less than 2D.
The tube wall pressure pipe 4 and tube hub pressure pipe 5 are located at 2 downstream 2D~10D of cyclone, tube wall pressure pipe 4
The pressure tappings of axis and tube hub pressure pipe 5 are located at same level.
A diameter of 0.5~the 2.0mm of pressure port at the tube wall pressure pipe 4 and tube hub pressure pipe 5.
The axis of pressure port is vertical with tube wall at the tube wall pressure pipe 4.
The pressure port axis direction of the tube hub pressure pipe 5 is identical with flow direction.
A kind of differential pressure type flow measurement method based on eddy flow principle, includes the following steps：
Step 1: when fluid flows through the cyclone 2 in pipeline 7, since fluid is by the constraint of cyclone 2, stream is forced
Body generates vortex flow according to the shape of cyclone 2, and fluid is rotated around tube hub axis, the flow further downstream in rotation, flowing
Track is approximately a helix, and the centrifugal force that fluid generates makes fluid generate pressure difference in tube wall and tube hub.The centrifugal force
The factors such as size and the shape of the tangential flow velocity of fluid, internal diameter of the pipeline, the density of fluid and cyclone 2 are related, tube wall pressure pipe 4
The static pressure of tube wall and tube hub can be taken out respectively with tube hub pressure pipe 5, the pressure difference of the two can be surveyed by differential pressure transmitter 6
It measures and；
Step 2: for cyclone 2, a certain cross section tube wall and tube hub after the size and cyclone 2 of fluid flow
For pressure difference there are certain relationship, analytic process is as follows：
The infinitesimal fluid of a certain cross section, the centrifugal force of unit mass micro unit is taken to beIt should be with barometric gradient phase
Balance, i.e.,：
By spin theory, by the tangential velocity variation rule along radius it is found that the tangential velocity of micro unit can be divided into potential barrier
Rotary District and like solid Rotary District, that is to say, that there are the cylindrical surfaces that a radius is r, and tangential velocity is maximum on it, is less than
The region of the diameter is known as like solid Rotary District, and tangential velocity reduces with radius and increased；Region more than the diameter is known as gesture
Rotary District is flowed, tangential velocity value is inversely proportional with radius r, and closer to axle center, tangential velocity is bigger.
By INTEGRAL THEOREM OF MEAN it is found that there is always a radius r^{*}, the tangential flow velocity at this can represent the tangential of the section
Mean flow rateThen formula (1) pair radius is integrated from 0R：
In formulaAnd r^{*}The tangential mean flow rate and the corresponding mean radius of mean flow rate, R for respectively representing section represent pipeline
Internal diameter.
Step 3: to seek the flow of fluid, it is necessary to acquire axial mean flow rateBut the regularity of distribution of axial velocity
It is more more complex than tangential velocity, simple theory analysis cannot be carried out, the structural shape of physical device is primarily due to
Diversification.
Since fluid is by being to do rotation to move upwards after cyclone, if cyclone is certain, axial mean flow rate
A fixed proportionate relationship is certainly existed with the tangential mean flow rate in some section, and the tangential mean flow rate and pressure difference
1/2 power is linear, that is to say, that 1/2 power of axial mean flow rate and some section tube wall and tube hub pressure difference is at line
Sexual intercourse：
In formula, α represents discharge coefficient, related with pipe diameter, sectional position etc., and it is a certain that Δ P indicates that fluid media (medium) flows through
Pressure drop when section between pipeline center and tube wall, ρ indicate Media density.
Due to the axial mean flow rate in all sections of pipelineIt is certain, and with the progress of flow direction, swirl strength
Can gradually it weaken, the pressure differential deltap P of tube wall and pipeline center can be gradually reduced, so as to cause the tangential mean flow rate of different cross section
It is different, that is to say, that discharge coefficient α is then related with the distance of crosssectional distance cyclone, and remoter apart from cyclone, the value of α is got over
Greatly.
In order to verify conclusions, we use 1 writing brush diameter (D=25.4mm), and cyclone is using specific " 8 rotations
Stream ", fluid media (medium) is water, we measure the pressure difference of pipeline center and tube wall respectively at cyclone downstream 2.7D and 11.8D, is led to
The flow for changing water is crossed, we delineate axial mean flow rateWith the relational graph of the section tube wall and tube hub pressure differential deltap P.
As shown in Fig. 2, for the position of cyclone downstream 2.7D,Relationship with Δ P is：
For the position of cyclone downstream 11.8D,Relationship with Δ P is：
It is found that axial mean flow rateIt is linear with the section tube wall and tube hub pressure differential deltap P, and from cyclone
Remoter, discharge coefficient α is bigger.Therefore it only needs in advance to demarcate specific hydrocyclone structure, after the cyclone measured
The pressure difference in a certain section, you can obtain the axial mean flow rate of pipeline, and then learn the flow of fluid.
Similarly, for multiphase flow, by taking biphase gas and liquid flow (AirWater) as an example, when gasliquid twophase fluid flows through swirlflow devices
Afterwards, due to density variation, it may occur that " being mutually separated " phenomenon relies on the effect of centrifugal force, biphase gas and liquid flow to be separated in pipe
At annular flow symmetric about the axis, center is gas core, and tube wall is annular liquid, has clear smooth interface between twophase.
When gas flow is 2L/min, as shown in figure 3, water phase flow and the section tube wall and tube hub pressure differential deltap P are also in certain
Linear relationship, as long as passing through calibration, so that it may calculate the size of flow with the pressure difference by a certain section after eddy flow.
Step 4: for monophasic fluid, according to formulaAcquire the flow of fluid.For heterogeneous fluid,
The actual internal area of corresponding each phase can be multiplied by by the axial mean flow rate of each phase, you can obtain the flow of each phase.
Claims (1)
1. a kind of measurement method of the differential pressure type flow meter based on eddy flow principle, which is characterized in that the differential pressure type
Flow measurement device includes the pipeline (7) of an a diameter of D, is provided with and is fitted closely with tube wall and static arrangement in pipeline (7)
Cyclone (2), the pipeline in cyclone (2) downstream is provided with tube wall pressure pipe (4) and tube hub pressure pipe (5), tube wall pressure
The outlet of pipe (4) and tube hub pressure pipe (5) is connected with two fluid inlets of differential pressure transmitter (6) respectively, method packet
Include following steps：
Step 1: when fluid flows through cyclone (2) in pipeline (7), since fluid is by the constraint of cyclone (2), force
Fluid generates vortex flow according to the shape of cyclone (2), and fluid is rotated around tube hub axis, the flow further downstream in rotation,
Flow trace is approximately a helix, and the centrifugal force that fluid generates makes fluid generate pressure difference in tube wall and tube hub, and tube wall takes
Pressure pipe (4) and tube hub pressure pipe (5) take out the static pressure of tube wall and tube hub respectively, and the pressure difference of the two passes through differential pressure transmitter
(6) it measures；
Step 2: for cyclone (2), a certain cross section tube wall and tube hub after the size and cyclone (2) of fluid flow
Pressure difference takes the infinitesimal fluid of a certain cross section, the centrifugal force of unit mass micro unit to be there are certain relationshipIt should be with pressure
Force gradient balances each other, i.e.,：
By INTEGRAL THEOREM OF MEAN it is found that there is always a radius r^{*}, the tangential flow velocity at this can represent the tangential mean flow in the section
SpeedThen formula (1) pair radius is integrated from 0R：
In formulaAnd r^{*}The tangential mean flow rate and the corresponding mean radius of mean flow rate, R for respectively representing section represent in pipeline
Diameter；
Step 3: since fluid is by being to do rotation to move upwards after cyclone, if cyclone is certain, axial mean flow
The tangential mean flow rate in speed and some section certainly exists a fixed proportionate relationship, and the tangential mean flow rate and pressure difference
1/2 power it is linear, that is to say, that 1/2 power of axial mean flow rate and some section tube wall and tube hub pressure difference at
Linear relationship：
In formula, α represents discharge coefficient, and related with pipe diameter, sectional position, value is obtained by experimental calibration；Δ P indicates stream
Pressure drop when body medium flows through a certain section between pipeline center and tube wall；ρ indicates Media density；
Step 4: for monophasic fluid, according to formulaAcquire the flow of fluid；For heterogeneous fluid, by each
The axial mean flow rate of phase is multiplied by the actual internal area of corresponding each phase, you can obtains the flow of each phase.
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CN107478278B (en) *  20170725  20190614  西安交通大学  It is a kind of based on the differential pressure type twophase flow measurement method for being mutually separated technology in pipe 
CN107543586B (en) *  20170818  20190614  西安交通大学  The twophase flow measurement device and method that formula electromagnetism differential pressure combines is mutually separated in pipe 
CN108828149A (en) *  20180619  20181116  北京空间飞行器总体设计部  A kind of gasliquid twophase fluid dryness measurement device and method 
CN109798945B (en) *  20190227  20200522  南昌航空大学  Fuel mass flow measuring method 
CN110987362A (en) *  20191211  20200410  宁波诺丁汉大学  Vortex flow measuring device and measuring method 
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