CN107014449B - The method for correcting pumping plant flow measurement - Google Patents
The method for correcting pumping plant flow measurement Download PDFInfo
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- CN107014449B CN107014449B CN201710267215.3A CN201710267215A CN107014449B CN 107014449 B CN107014449 B CN 107014449B CN 201710267215 A CN201710267215 A CN 201710267215A CN 107014449 B CN107014449 B CN 107014449B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The present invention relates to pumping plant flow control technique fields, disclose a kind of method for correcting pumping plant flow measurement, comprising: obtain the threedimensional model of pumping station system runner；Grid dividing is carried out to the threedimensional model；The data for obtaining multiple work condition states are calculated in conjunction with boundary condition imitation, the data include average speed v of the simulated sound diatom along pipeline axial directionLineWith the normal direction average speed v of pipe section where simulated sound diatom midpointFace；It calculates and obtains corresponding correction factor η；Correction factor-discharge relation curve is generated, the flow is the flow Q on simulated sound diatomSimulation；Obtain the actually measured flow value Q of ultrasonic flowmeterMeasurement, based on setting relational expression to QMeasurementIt is modified.Method provided by the invention improves the precision of data so that the data that the ultrasonic flow rate measurement that pumping plant uses obtains are corrected, and reduces the error of pumping plant field flow testing, keeps the operation of pumping plant more stable and energy saving.
Description
Technical field
The present invention relates to pumping plant flow control technique fields, more particularly to a kind of side for correcting pumping plant flow measurement
Method.
Background technique
It is more and more to large pumping station demand with the construction of China's south water to north and its conveyance system.Pumping station operation stream
Amount is the important parameter concerning the operation of pumping plant efficient stable.How the flow of large pumping station is under precise measurement exemplary operation state
Urgent problem to be solved.
For large diameter pipeline formula inlet and outlet system, the ultrasonic flowmeter based on time propagation method is generallyd use to test
Pumping plant flow.It is big with pressure energy loss, caliber adaptation range that it has many advantages, such as that easy for installation, contactless no flowing is obstructed,
It is widely used in a variety of applications on large pumping station.But this method is very high to the requirement of Measure section streamflow regime, theoretically wishes it
Measure section is the fully developed turbulent flow being evenly distributed.This proposes harsh requirement to mounting condition, that is, requires quilt
Straight pipe before and after survey channel position is longer, and flows and interfere without large eddies.Meanwhile measurement accuracy grade and channel number
It is closely related, but channel number is more, and the price of equipment is higher.
But practical pumping plant is often unable to satisfy ultrasonic flowmeter ideal due to investment, the limitation of the aspect of device layout
Installation requirement, and measure sound channel substantially all below 4 sound channels.So inevitably to pumping plant scene flow measurement band
Carry out systematic error.If adjusting pumping station operation according to flow measurement, pumping plant may be made to deviate operating condition, so that energy consumption becomes
Greatly, increase pumping station operation cost.
Summary of the invention
(1) technical problems to be solved
The object of the present invention is to provide a kind of methods for correcting pumping plant flow measurement, ultrasonic in the prior art to overcome
The big problem of wave flowmeter measurement result system deviation.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of methods for correcting pumping plant flow measurement, comprising:
S1, the threedimensional model for obtaining pumping station system runner；
S2, grid dividing is carried out to the threedimensional model；
S3, the data for obtaining multiple work condition states are calculated in conjunction with boundary condition imitation, the data include simulated sound diatom
Along the average speed v of pipeline axial directionLineWith the normal direction average speed v of pipe section where simulated sound diatom midpointFace；It calculates
Obtain corresponding correction factor η；
S4, correction factor-discharge relation curve is generated, the flow is the flow Q on simulated sound diatomSimulation；
S5, the actually measured flow value Q of ultrasonic flowmeter is obtainedMeasurement, based on setting relational expression to QMeasurementIt is modified.
Wherein, the coefficient η is obtained by formula (1):
It wherein, further include the independence inspection for carrying out the grid before the boundary condition is set.
Wherein, the system runner includes forebay, intake pool, water inlet pipe, pump, outlet pipe, forbay, pipe of climbing the mountain, water outlet
Pond.
Wherein, the water inlet pipe is connected with imported valve, and the outlet pipe is connected with outlet valve.
Wherein, the imported valve and/or the outlet valve are butterfly valve.
Wherein, the boundary condition includes: the free surface of the forebay, intake pool and discharge bay using at rigid-lid assumption
Reason, remaining wall surface is set as solid wall surface, it is specified that the solid wall surface boundary is without sliding；The pump includes impeller, with the leaf
The interface of wheel is set as rotor interface, and remaining interface is set as fixation interface；The inlet flow rate of the forebay is set
It is set to inlet boundary condition, the pressure export of the discharge bay is set as export boundary condition.
Wherein, the work condition state is based on multiple inlet flow rates.
Wherein, the setting relational expression is based on formula (2):
QAmendment=η QMeasurement(2)；
Wherein, QAmendmentFor revised flow value；QMeasurementFor the actually measured flow value of ultrasonic flowmeter.
(3) beneficial effect
The method of amendment pumping plant flow measurement provided by the invention, by carrying out different operating conditions to pumping station system runner
Under hydrodynamic simulation, obtain on simulated sound diatom along the average speed of pipeline axial direction, where harmony diatom midpoint
The normal direction average speed of pipe section, so by the relationship between the two obtain ultrasonic flowmeter actual measured value and correction value it
Between relationship, and it is corresponding between correction factor and the flow value of actual measurement by being fitted to multiple correction factors of acquisition
Curve, the amendment of the final data for realizing measurement.Method provided by the invention, so that the ultrasonic flow rate measurement that pumping plant uses obtains
Data corrected, improve the precision of data, reduce the error of pumping plant field flow testing, make the operation of pumping plant more
Add stable and energy conservation.
Detailed description of the invention
Fig. 1 is the method flow diagram of amendment pumping plant flow measurement provided in an embodiment of the present invention；
Fig. 2 is pumping plant fluid domain Flow Measuring System schematic diagram in the embodiment of the present invention；
Fig. 3 is that ultrasonic flowmeter simulates sound channel position view in the embodiment of the present invention；
Fig. 4 is the graph of relation of correction factor and actually measured flow in the embodiment of the present invention；
Fig. 5 is Fig. 2 partial enlargement diagram；
Fig. 6 is ultrasonic flow rate measurement amount schematic illustration；
In figure, 1, forebay；2, intake pool；3, water inlet pipe；4, it pumps；5, outlet pipe；6, forbay；7, sound channel；8, it climbs the mountain pipe；
9, discharge bay；10, imported valve；11, outlet valve；701, the first simulation sound channel；702, the second simulation sound channel；703, third mould
Onomatopoeia road；704, pipe section；705, sound channel midpoint is simulated；706, the first sound channel sensor；707, second sound channel sensor；708,
Third sound channel sensor.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Following instance
For illustrating the present invention, but it is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in inventive embodiments.
Flow refers to the Fluid Volume that closed conduct or open channel effective cross-section are flowed through in the unit time, also known as instantaneous flow, i.e.,
Flow is an opposite fixed section to calculate.In the prior art, pumping plant flow usually passes through ultrasonic flow rate measurement amount,
According to ultrasonic flow rate measurement amount principle, the speed that ultrasonic flow rate measurement obtains is the mean flow rate in sound channel, and because of sound channel
With certain length, so the flow value that measurement obtains, which can not accurately react, passes through the true of a section in certain time
Flow, and then flowmeter measurement result and actual result is caused to have system deviation.The embodiment of the present invention provides one kind to the system
The method that deviation is modified, by using computational fluid dynamics emulation technology CFD (Computational Fluid
Dynamics), the simulation to system pumping plant Ultrasonic Flowmeter amount process is realized.
Fig. 1 is a kind of method flow diagram for correcting pumping plant flow measurement in the embodiment of the present invention；Fig. 2 is that the present invention is real
Apply pumping plant fluid domain Flow Measuring System schematic diagram in example；Fig. 3 is that ultrasonic flowmeter simulates sound channel position in the embodiment of the present invention
Set schematic diagram；Fig. 4 is the graph of relation of correction factor and actually measured flow in the embodiment of the present invention；Fig. 5 is the part Fig. 2
Enlarged diagram；Fig. 6 is ultrasonic flow rate measurement amount schematic illustration.
As depicted in figs. 1 and 2, the embodiment of the present invention provides a kind of method for correcting pumping plant flow measurement, comprising:
S1, the threedimensional model for obtaining pumping station system runner.
During pumping station operation, the place that liquid flows through can be described as pumping station system runner.Before carrying out calculating simulation,
Firstly the need of the threedimensional model for obtaining pumping station system runner, which can be to establish in 3 d modeling software and complete
, it is directed into simulation software by way of importing, can also be the threedimensional model directly established in simulation software.This implementation
In example, pumping station system runner includes forebay 1, intake pool 2, water inlet pipe 3, pump 4, outlet pipe 5, forbay 6, climb the mountain pipe 8, discharge bay
9, as shown in Figure 2.Wherein, water inlet pipe is connected with imported valve 10, and outlet pipe is connected with outlet valve 11, convenient in pipeline
Fluid controlled, as shown in Figure 5.Preferably, imported valve and outlet valve use butterfly valve, or in which one of use butterfly
Valve.
S2, grid dividing is carried out to the threedimensional model.
In the present embodiment, threedimensional model is established by 3 d modeling software.It is soft that established threedimensional model is imported into emulation
It in part, such as is directed into Fluent, grid dividing then is carried out to each runner.It, can be according to practical need during grid division
Partial Mesh is refined.In addition, for the accuracy for guaranteeing simulation result, before carrying out formal data simulation, need pair
Ready-portioned grid carries out independence inspection.Such as when ultrasonic flowmeter is arranged in outlet pipe 5, sound channel 7 is located at
In water pipe 5.It carries out in independence checking process, after setting boundary condition, carries out numerical value calculating, boundary condition at this time is not required to
To be consistent with actual conditions, it is only necessary to guarantee in independence checking process, only change the fine and closely woven degree of grid dividing, do not change side
Boundary's condition.After emulation obtains data, the sound channel line of the first simulation sound channel 701 is drawn, as shown in Figure 3.If simulating sound channel midpoint
The change rate for the speed that fluid velocity at 705 changes with grid is no more than 0.5%, then shows to be calculated at this time
Analogue data is not influenced substantially by the fine and closely woven degree of grid, can enter formal simulation trial at this time.In grid independence
On the basis of passed examination, the boundary layer scale y of grid+Between 30-500, y+It is wall surface distance and friction velocity and movement
The non-dimensional ratio of viscosity.
S3, the data for obtaining multiple work condition states are calculated in conjunction with boundary condition imitation, the data include simulated sound diatom
Along the average speed v of pipeline axial directionLineWith the normal direction average speed v of pipe section where simulated sound diatom midpointFace；It calculates
Obtain corresponding correction factor η.
After having divided qualified grid to threedimensional model, starts the boundary condition setting steps before being calculated, that is, carry out
The setting of parameter.Wherein, important boundary condition setting includes: governing equation selection standard k- ε model；Forebay 1, intake pool 2
It is unfettered with the top surface of liquid in 9 three runners of discharge bay and become free surface, in simulation process, the part free surface
It is handled using rigid-lid assumption, rigid-lid assumption processing does not consider the case where water level fluctuation influences, only considers the tangential speed on the scope of freedom
Degree, ignores normal velocity.In addition to free surface, referred to as wall surface, remaining wall surface is set remaining boundary face due to constrained in practice
It is set to solid wall surface, and provides solid wall surface boundary without sliding.Pumping includes impeller in 4, in simulation process, the friendship of liquid and impeller
Interface is set as rotor interface, and remaining interface is set as fixation interface；The inlet flow rate of forebay 1 is set as inlet side
The pressure export of boundary's condition, discharge bay 9 is set as export boundary condition；Using permanent calculating, iteration at least 1000 steps restrain residual
Difference is set as 10-5.Under different work condition states, the inlet flow rate setting value of forebay 1 is different, remaining parameter setting mode is not
Become, the data under multiple operating conditions can be obtained in this way.The data of acquisition include: average speed of the simulated sound diatom along pipeline axial direction
Spend vLineWith the normal direction average speed v of pipe section where simulated sound diatom midpointFace。
The working principle of ultrasonic flowmeter is: at the sound channel length L of certain length, ultrasonic wave is in the liquid of flowing
Downstream propagation is different from the time that adverse current is propagated, and measures flow rate of liquid indirectly by the time between measurement fair current and adverse current.
As shown in fig. 6, setting spread speed of the ultrasonic wave in inactive liquid as c, liquid velocity v, A are ultrasonic wave transmitting
Point, B are receiving point, and ultrasonic wave sound channel length is L, and sound channel and pipeline angle are α；
Then, when fair current, i.e., from A to B, ultrasonic propagation time T1:
When adverse current, i.e., from B to A, ultrasonic propagation time T2:
Obtain the flow rate of liquid v that ultrasonic flow rate measurement obtains:
By simulation, it can be achieved that actually measured flow rate of liquid vUltrasonic waveWith edge on simulated sound diatom obtained in simulation process
The average speed v of pipeline axial directionLineIt is identical.
In sampling process, need strictly to draw the line where 7 position of sound channel, as shown in Figure 3, a plurality of sound channel just draws more
Artificial line is arranged three sound channels in the present embodiment, draws 3 simulated sound diatoms, indicate position setting when actual measurement
Ultrasonic flow is in respect of three groups of sound channel sensors, respectively the first sound channel sensor 706, second sound channel sensor 707, third sound
Road sensor 708, as shown in Figure 3.The three simulation sound channels drawn are respectively the first simulation sound channel 701, second simulation sound channel
702, third simulates sound channel 703, obtains in three sound channels average after the average speed of pipeline axial direction respectively, obtain average
vLine, then the pipe section 704 of sound channel midpoint is drawn, obtain the normal direction average speed v at outlet pipe section 704Face。
If section part sectional area is S, enable:
Wherein, vSectionIt is the normal direction average speed in sound channel central point section, vUltrasonic waveRefer to the average speed in sound channel.In this way
In the case where analog quantity is identical as actual measurement amount or very close, that is, set up the pass between analog quantity and actual measurement amount
System, can obtain revised flow value by the formula.In order to which subsequent applications are convenient, at least need to obtain under ten operating conditions
Correction factor η.
S4, correction factor-discharge relation curve is generated, flow is the flow Q on simulated sound diatomSimulation。
Correction factor η and the flow Q that simulation obtains are obtained with least square methodSimulationMatched curve figure, such as institute in Fig. 4
Show.
Wherein, QSimulationIt is obtained by formula (1-5):
QSimulation=SvLine (1-5)
S5, the actually measured flow value Q of ultrasonic flowmeter is obtainedMeasurement, based on setting relational expression to QMeasurementIt is modified.
After obtaining curve, flow value amendment can be realized.Obtain the actually measured flow value Q of ultrasonic flowmeterMeasurement, this
When QMeasurementWith QSimulationBe it is identical, read the flow value Q of actual measurementMeasurementAfterwards, identical flow value is found in curvilinear coordinate,
And then corresponding correction factor is obtained, the amendment of flow value is then realized by specific relational expression.Wherein, the relational expression of setting
Based on formula (1-6):
QAmendment=η QMeasurement (1-6)。
Wherein, QAmendmentFor revised flow value；QMeasurementFor the actually measured flow value of ultrasonic flowmeter.
The method of amendment pumping plant flow measurement provided by the invention, by carrying out different operating conditions to pumping station system runner
Under hydrodynamic simulation, obtain on simulated sound diatom along the average speed of pipeline axial direction, where harmony diatom midpoint
The normal direction average speed of pipe section, so by the relationship between the two obtain ultrasonic flowmeter actual measured value and correction value it
Between relationship, and it is corresponding between correction factor and the flow value of actual measurement by being fitted to multiple correction factors of acquisition
Curve, the amendment of the final data for realizing measurement.Method provided by the invention, so that the ultrasonic flow rate measurement that pumping plant uses obtains
Data corrected, improve the precision of data, reduce the error of pumping plant field flow testing, make the operation of pumping plant more
Add accurate stable.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of method for correcting pumping plant flow measurement characterized by comprising
S1, obtain pumping station system runner threedimensional model, the system runner include at least forebay, intake pool, water inlet pipe, pump,
Outlet pipe, forbay, pipe of climbing the mountain, discharge bay；
S2, grid dividing, the independence inspection of the grid, the boundary layer scale y of the grid are carried out to the threedimensional model+
Between 30-500, y+It is the non-dimensional ratio of wall surface distance and friction velocity and kinematic viscosity；
S3, the data for obtaining multiple work condition states are calculated in conjunction with boundary condition imitation, the data include simulated sound diatom along pipe
The average speed v of road axial directionLineWith the normal direction average speed v of pipe section where simulated sound diatom midpointFace；It calculates and obtains
Corresponding correction factor η；Wherein, the boundary condition includes: the free surface of the forebay, intake pool and discharge bay using just lid
It is assumed that processing, remaining wall surface is set as solid wall surface, it is specified that the solid wall surface boundary is without sliding；The pump includes impeller, with
The interface of the impeller is set as rotor interface, and remaining interface is set as fixation interface；The import of the forebay
Flow set is inlet boundary condition, and the pressure export of the discharge bay is set as export boundary condition；
S4, correction factor-discharge relation curve is generated, the flow is the flow Q on simulated sound diatomSimulation；
S5, the actually measured flow value Q of ultrasonic flowmeter is obtainedMeasurement, based on setting relational expression to QMeasurementIt is modified.
2. the method as described in claim 1, which is characterized in that the coefficient η is obtained by formula (1):
3. the method as described in claim 1, which is characterized in that the water inlet pipe is connected with imported valve, and the outlet pipe connects
It is connected to outlet valve.
4. method as claimed in claim 3, which is characterized in that the imported valve and/or the outlet valve are butterfly valve.
5. the method as described in claim 1, which is characterized in that the work condition state is based on multiple inlet flow rates.
6. the method as described in claim 1, which is characterized in that the setting relational expression is based on formula (2):
QAmendment=η QMeasurement(2)；
Wherein, QAmendmentFor revised flow value；QMeasurementFor the actually measured flow value of ultrasonic flowmeter.
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| CN110543677B (en) * | 2019-07-31 | 2021-03-23 | 中国农业大学 | Method for constructing vortex characteristic driven rotational turbulence PANS model |
| CN111400946B (en) * | 2020-03-10 | 2022-03-22 | 中国农业大学 | Demand-driven type feature identification method for eddy current field self-adaptive grid refinement |
| CN111308337A (en) * | 2020-03-31 | 2020-06-19 | 张铭源 | Performance evaluation method for centrifugal fan inlet guide vane regulating valve |
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