CN108132135A - A kind of pipeline flow resistance measuring device and its measuring method - Google Patents
A kind of pipeline flow resistance measuring device and its measuring method Download PDFInfo
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- CN108132135A CN108132135A CN201611093687.3A CN201611093687A CN108132135A CN 108132135 A CN108132135 A CN 108132135A CN 201611093687 A CN201611093687 A CN 201611093687A CN 108132135 A CN108132135 A CN 108132135A
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- fluistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The present invention relates to a kind of pipeline flow resistance measuring device and its measuring method, device includes storage tank, pump, standard Fluistor A, standard Fluistor B, standard Fluistor C, standard Fluistor D, solenoid valve, plug, pressure sensor, temperature sensor, data collecting card, computer；A kind of pipeline flow resistance measuring method, liquid storage pot liquid after fluid is by pumping, flow through the pipeline that the pipeline that composes in series of pipeline A and pipeline B of known flow resistance and flow resistance pipeline X to be measured and known flow resistance pipeline C, known flow resistance pipeline D are composed in series parallel；The configuration of the present invention is simple, stabilization, precisely.The present invention can measure the pipeline flow resistance of any labyrinth, the relatively general measuring method of the present invention, neither control pressure nor control flow, reduce system complexity and cost.
Description
Technical field
The present invention relates to flow resistance measuring methods in fields of measurement, are exactly a kind of pipeline flow resistance measuring device and side
Method.
Background technology
In the transfer pipeline of liquid or gas, the size of pipeline flow resistance affect entire pipe-line system transmission flow and
Transmit flow control.For example it must accurately calculate each section in aerospace field, a set of fluid path or gas circuit Transmission system
The practical flow resistance of pipeline, so that its flow control system is coordinated to realize the accurate control of fluid transmission.Similarly in oil, chemical industry, doctor
The pipeline flow resistance measurement of the fields such as medicine is also very important.
The measuring method of general pipeline flow resistance characteristic generally has following three kinds, and one kind is to give pipe-line system firm discharge,
Then it is poor directly to survey pipe-line system pressure at two ends, finally obtains flow resistance.Another kind is to fix to squeeze pushing force, flow measurement to pipe-line system
Amount variation；The shortcomings that both kind methods is to need additional Pressure control or flow control, and can only measure overall flow resistance, for
For complex pipeline system, can only first design and assembly completion measure flow resistance again, if flow resistance characteristic is unsatisfactory for demand, change
It has no way of doing it.Another method is directly to measure pipeline physical features, such as the length internal diameter physical features of pipeline, passes through calculating
To calculate the flow resistance of pipeline.But in the pipeline of non-regular shape, measurement can become considerably complicated or even can not measure,
And then it can not calculate.
Also a kind of demand is to measure the transformable flow resistances such as valve, filter, such as filter, when filter long-time
After use due to blocking etc., flow resistance increase, if measured with first method, it is assumed that there is multiple filterings in pipe-line system
Which plugged filter device is on earth, and measuring will be extremely complex, cumbersome.If measured with second method, root
Originally its physical features can not be measured, and then can not be measured.
For the deficiency measured with upper pipeline flow resistance, a kind of control pressure that both do not had to of design also is able to without control flow
Measuring the method or apparatus of any structure pipeline flow resistance is very important.
Invention content
The present invention to solve the above-mentioned problems, provides a kind of new flow resistance measuring method and device, utilizes parallel pipeline
" equilibrium state " obtains measurement zero, the relationship of pressure differential and flow resistance is derived according to pipeline " nonequilibrium condition ", and then realize
Flow resistance measures.
Present invention technical solution used for the above purpose is：
A kind of pipeline flow resistance measuring device, including fluid reservoir, pump, Fluistor branch, sensor and computer；
Fluid reservoir return port is connected to after pump of the output pipe of fluid reservoir through setting gradually, Fluistor branch；In storage tank
Equipped with temperature sensor；Fluistor branch is for several and in parallel；Branch road is equipped with pressure sensor；
The temperature sensor and pressure sensor are connect with computer.
The Fluistor branch is two.
The Fluistor branch includes two sections of pipelines being linked in sequence；Pressure sensor is equipped between two sections of pipelines.
End is equipped with plug in the Fluistor branch, for accessing pipeline to be measured；It is in parallel with solenoid valve.
Pipeline between the fluid reservoir and Fluistor branch is equipped with pressure sensor.
A kind of pipeline flow resistance measuring method, includes the following steps：
Pipeline X to be measured is accessed into end in a certain flow resistance branch and is closed, opens solenoid valve in parallel；
After liquid storage pot liquid is by pumping, parallel stream crosses flow resistance branch；Fluid flows after converging in the end of flow resistance branch
Enter fluid reservoir；
When pipeline balances, close solenoid valve and connect pipeline X to be measured；
The pipeline A that connects in the first flow resistance branch, pipeline B junctions measure pressure P1；It is gone here and there in the second flow resistance branch
The pipeline D of connection, pipeline C junctions measure pressure P2；
According to P1、P2Obtain the flow resistance of pipeline X to be measured.
The pipeline balance is P1=P2。
It is described according to P1、P2The flow resistance for obtaining pipeline X to be measured is obtained by the following formula：
RX=| (P1-P2)|*×(8ηLA/(πrA 4)+8ηLD/(πrD 4))2/((8ηLA/(πrA 4))×(P+-P-))；
Wherein, RXFor pipeline X flow resistances, and LX/(rX 4) less than LD/(rD 4) several times；P+、P-Respectively fluid reservoir is responsible for
Pressure value between road and flow resistance branch entrance, between fluid reservoir main line and flow resistance branch way outlet.(P+-P-) it is main line end pressure,
Fluid viscosity under η Current Temperatures；rA、rDThe internal diameter of respectively pipeline A, pipeline D, LA、LDThe length of respectively pipeline A, pipeline D,
rX、LXThe respectively internal diameter of pipeline X, length.
The pipeline A, pipeline B, pipeline C, pipeline D meet following relationship：
LA/(rA 4)×LC/(rC 4)=LB/(rB 4)×LD/(rD 4)
Wherein, rA、rB、rC、rDRespectively pipeline A, pipeline B, pipeline C, pipeline D internal diameter；LA、LB、LC、LDRespectively manage
Road A, pipeline B, pipeline C, pipeline D length.
The invention has the advantages that and advantage：
1. the configuration of the present invention is simple, stabilization, precisely.
2. the measuring mechanism of the present invention is simple, easy to implement, simple structure and computational methods ensure that the precision of measurement.
3. the present invention can measure the pipeline flow resistance of any labyrinth.
4. the relatively general measuring method of the present invention, neither control pressure nor flow is controlled, reduce system complexity
And cost.
Description of the drawings
Fig. 1 is the method schematic diagram of the present invention.
Wherein, 201 storage tanks, 202 flow resistance A, 203 flow resistance D, 204 flow resistance C, 205 flow resistance B, 206 pressure P1, 207 pressure P2、
208 liquid outlets, 209 fluid temperature T, 210 main line pressure P.
Fig. 2 is the device of the invention structure chart.
Wherein, 101 storage tanks, 102 pumps, 103 standard Fluistor A, 104 standard Fluistor B, 105 standard Fluistor C, 106 marks
Quasi- Fluistor D, 108 solenoid valves, 107 plugs, 109 pressure sensors 1,110 pressure sensors 2,111 temperature sensors, 112 numbers
According to capture card, 113 computers, 114 pressure sensor P+, 115 pressure sensor P-；0~7 is each position three-way connection label.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and embodiments.
The present invention to solve the above-mentioned problems, provides a kind of new flow resistance measuring method, design two bypass lines " balance
State " obtains measurement zero, the relationship of pressure differential and flow resistance is derived according to pipeline " nonequilibrium condition ", and then realize flow resistance
It measures, derivation method is：
Had according to Poiseuille's law：Q=△ P/R；Q is volume flow, △ P are pressure difference, R is flow resistance.
When two pipelines are connected on an access：R=R1+R2；R1、R2The flow resistance of respectively two pipelines.
When two branch road on two pipelines respectively an access is connected with：R=1/ (1/R1+1/R2)；
Such as Fig. 1：A kind of structure is designed, by four pipelines on the Liang Gezhi roads of an access；
There is relationship below when X flow resistances are 0：
P1-P2=RD/(RA+RD)×(P+-P-)-RC/(RB+RC)×(P+-P-)
=(RB×RD-RA×RC)/((RA+RD)×(RB+RC))×(P+-P-)
RA、RB、RC、RDRespectively pipeline A, pipeline B, pipeline C, pipeline D flow resistance；P+、P-Two respectively on main line
The pressure of branch arrival end and the port of export；
When its flow resistance relationship meets RA×RC=RB×RDWhen, as long as having stably stratified flow fluid to flow through at this time has pipeline A and pipe
Road B junctions pressure P1Equal to pipeline D and pipeline C junctions pressure P2；That is P1=P2；
This state is two bypass lines " equilibrium state "；
When a pipeline X is added at pipeline D ends, " equilibrium state " is broken, P1≠P2Enter " nonequilibrium condition "；
P under " nonequilibrium condition " state1-P2Relationship with flow resistance is：
P1-P2=(RB×(RD+RX)-RA×RC)/((RA+RD+RX)×(RB+RC))×(P+-P-)
=RB×RX/((RA+RD+RX)×(RB+RC))×(P+-P-)=RX/((RA/RB+RD/RB+RX/RB)×(RB+RC))
×(P+-P-)
=(RA/(RA+RD)2)×(1/(1+RX/(RA+RD)))×(P+-P-)×RX
Work as RXMuch smaller than RDWhen have RX=| (P1-P2)|×(RA+RD)2/(RA×(P+-P-))；The present embodiment RXLess than RD's
10 times.
Present invention implementation such as Fig. 2 used for the above purpose：
A kind of pipeline flow resistance measuring device, including storage tank 101, pump 102, standard Fluistor A103, standard Fluistor B
104th, standard Fluistor C 105, standard Fluistor D 106, solenoid valve 108, plug 107, pressure sensor 1 109, pressure pass
Sensor 2 110, pressure sensor P+114th, pressure sensor P-115th, temperature sensor 111, data collecting card 112, computer
113。
The output pipe of storage tank is connected with pumping by pipeline, and storage tank upper end has temperature sensor to be threadably secured direct depth
Enter to tank inside and be insinuated into fluid；
Pump outlet end is connected to the port 1 of three-way connection 0 by pipeline, and pump control terminal passes through cable connection to computer；
The port 2 of three-way connection 0 is connected to pressure sensor P by pipeline+, pressure sensor P+Signal end is adopted with data
Truck is connected with conducting wire；
The port 3 of three-way connection 0 is connected to the port 1 of three-way connection 1 by pipeline；
The port 2 of three-way connection 1 is connect by pipeline with standard Fluistor A arrival ends；
The standard Fluistor A ports of export are connect with the port 1 of three-way connection 2 with pipeline；
The port 2 of three-way connection 2 is connect with pressure sensor 1 with pipeline, 1 signal end of pressure sensor and data collecting card
It is connected with conducting wire；
The port 3 of three-way connection 2 is connect with standard Fluistor B with pipeline, the port of export and three-way connection of standard Fluistor B
3 port 1 is connected with pipeline；
The port 2 of three-way connection 3 is connect with electromagnetic valve entrance end with pipeline, electromagnetic valve outlet end and 4 port 1 of three-way connection
It is connected with pipeline, solenoid valve control end is connect with data collecting card by conducting wire；
The port 3 of three-way connection 3 is connect with plug 1；
The port 2 of three-way connection 4 is connect with plug 2；
The port 3 of three-way connection 4 is connect with the port 1 of three-way connection 5 with pipeline；
The port 3 of three-way connection 1 is connect by pipeline with standard Fluistor D arrival ends；
The port of export of standard Fluistor D is connect with the port 1 of three-way connection 6 by pipeline；
The port 2 of three-way connection 6 is connect with pressure sensor 2 by pipeline, and 2 signal end of pressure sensor is acquired with data
Card is connected with conducting wire；
The port 3 of three-way connection 6 is connect with standard Fluistor C with pipeline, standard Fluistor C serial ports end and three-way connection
5 port 2 is connected with pipeline；
5 port 3 of three-way connection is connect with 7 port 1 of three-way connection by pipeline；
7 port 2 and pressure sensor P of three-way connection-It is connected by pipeline, pressure sensor P-Signal end is acquired with data
Card is connected with conducting wire；
7 port 3 of three-way connection is connect with storage tank liquid inlet with pipeline；
Data collecting card is connect with computer by PCI slot；
The standard Fluistor A, standard Fluistor B, standard Fluistor C, standard Fluistor D meet
LA/(rA 4)×LC/(rC 4)=LB/(rB 4)×LD/(rD 4) relationship；
The L is length of tube, and r is pipe inside radius.
A kind of pipeline flow resistance measuring method, includes the following steps：
Liquid storage pot liquid, after fluid is by pumping, the pipeline A and pipeline B that flow through known flow resistance parallel are composed in series
The pipeline that pipeline and flow resistance pipeline X to be measured and known flow resistance pipeline C, known flow resistance pipeline D are composed in series；
Fluid converges in the tail end of pipeline B and pipeline C passes back into storage tank for after；
Pressure P is measured in pipeline A and pipeline B junctions1；
Pressure P is measured in pipeline D and pipeline C junctions2；
Pipeline A, pipeline B, pipeline C, pipeline D meet following relationship：
LA/(rA 4)×LC/(rC 4)=LB/(rB 4)×LD/(rD 4)；
Have when advection known-viscosity Newtonian fluid in whole pipeline：
RAXRC=RBXRD；
RA、RB、RC、RDFor pipeline A, pipeline B, pipeline C, pipeline D flow resistance values；
Pipeline X flow resistances to be measured are calculated by the following formula：
RX=| (P1-P2)|×(8ηLA/(πrA 4)+8ηLD/(πrD 4))2/((8ηLA/(πrA 4)×(P+-P-))；
RXFor pipeline X flow resistances, and LX/(rX 4) much smaller than LD/(rD 4)；(P+-P-) for main line end pressure, under η Current Temperatures
Fluid viscosity.
Standard Fluistor is the pipeline of known flow resistance.
The standard Fluistor A, standard Fluistor B, standard Fluistor C, standard Fluistor D meet following relationship：
LA/(rA 4)×LC/(rC 4)=LB/(rB 4)×LD/(rD 4)；
It is designed as：
①：The length L of standard Fluistor AA=100mm；Inside radius rA=1mm；
The length L of standard Fluistor BB=100mm；Inside radius rB=1mm；
The length L of standard Fluistor CC=100mm；Inside radius rC=1mm；
The length L of standard Fluistor DD=100mm；Inside radius rD=1mm；
②：It is pure water in storage tank, water temperature is 20 DEG C, and viscosity η is about 1.007；
③：According to：R=8 η L/ (π r4)
Then RA、RC、RB、RDIt is 256.6；
④：It opens pump 102 and solenoid valve 108 treats that water is circulated back to storage tank and sees pressure sensor 1 109, pressure sensor 2
Whether 110 gathered datas are identical, and whether system balances；
⑤：Solenoid valve is closed, two plugs 107 of equipment are opened access pipeline both ends to be measured.
⑥：Acquire pressure sensor 1 109, pressure sensor 2 110, pressure sensor P+114th, pressure sensor P-
115 be respectively P1、P2、P+、P-；
⑦：By RX=| (P1-P2)|×(RA+RD)2/(RA×(P+-P-)) obtain pipeline R to be measuredXValue.
Claims (9)
1. a kind of pipeline flow resistance measuring device, it is characterised in that：Including fluid reservoir, pump, Fluistor branch, sensor and calculating
Machine；
Fluid reservoir return port is connected to after pump of the output pipe of fluid reservoir through setting gradually, Fluistor branch；It is equipped in storage tank
Temperature sensor；Fluistor branch is for several and in parallel；Branch road is equipped with pressure sensor；
The temperature sensor and pressure sensor are connect with computer.
2. a kind of pipeline flow resistance measuring device according to claim 1, it is characterised in that the Fluistor branch is two.
3. a kind of pipeline flow resistance measuring device according to claim 1, it is characterised in that the Fluistor branch includes suitable
Two sections of pipelines of sequence connection；Pressure sensor is equipped between two sections of pipelines.
A kind of 4. pipeline flow resistance measuring device according to claim 1, it is characterised in that end in the Fluistor branch
Equipped with plug, for accessing pipeline to be measured；It is in parallel with solenoid valve.
5. a kind of pipeline flow resistance measuring device according to claim 1, it is characterised in that the fluid reservoir and Fluistor branch
Pipeline between road is equipped with pressure sensor.
6. a kind of pipeline flow resistance measuring method, it is characterised in that include the following steps：
Pipeline X to be measured is accessed into end in a certain flow resistance branch and is closed, opens solenoid valve in parallel；
After liquid storage pot liquid is by pumping, parallel stream crosses flow resistance branch；Fluid flows into storage after converging in the end of flow resistance branch
Flow container；
When pipeline balances, close solenoid valve and connect pipeline X to be measured；
The pipeline A that connects in the first flow resistance branch, pipeline B junctions measure pressure P1；The pipe connected in the second flow resistance branch
Road D, pipeline C junctions measure pressure P2；
According to P1、P2Obtain the flow resistance of pipeline X to be measured.
7. a kind of pipeline flow resistance measuring method according to claim 6, it is characterised in that the pipeline balance is P1=P2。
8. a kind of pipeline flow resistance measuring method according to claim 6, it is characterised in that described according to P1、P2It obtains to be measured
The flow resistance of pipeline X is obtained by the following formula：
RX=| (P1-P2)|*×(8ηLA/(πrA 4)+8ηLD/(πrD 4))2/((8ηLA/(πrA 4))×(P+-P-))；
Wherein, RXFor pipeline X flow resistances, and LX/(rX 4) less than LD/(rD 4) several times；P+、P-Respectively fluid reservoir main line with
Pressure value between flow resistance branch entrance, between fluid reservoir main line and flow resistance branch way outlet.(P+-P-) it is main line end pressure, η works as
Fluid viscosity at preceding temperature；rA、rDThe internal diameter of respectively pipeline A, pipeline D, LA、LDThe length of respectively pipeline A, pipeline D, rX、
LXThe respectively internal diameter of pipeline X, length.
9. a kind of pipeline flow resistance measuring method according to claim 6, it is characterised in that the pipeline A, pipeline B, pipeline
C, pipeline D meets following relationship：
LA/(rA 4)×LC/(rC 4)=LB/(rB 4)×LD/(rD 4)
Wherein, rA、rB、rC、rDRespectively pipeline A, pipeline B, pipeline C, pipeline D internal diameter；LA、LB、LC、LDRespectively pipeline A,
Pipeline B, pipeline C, pipeline D length.
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Cited By (5)
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| CN108132143A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring method |
| CN110470569A (en) * | 2019-09-04 | 2019-11-19 | 中国计量大学 | A kind of capillary pipeline vapour lock measuring device and measuring method |
| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
| CN112414669A (en) * | 2019-08-21 | 2021-02-26 | 中国石油天然气股份有限公司 | Method for measuring liner tube overcurrent resistance experiment |
| CN114414204A (en) * | 2021-12-31 | 2022-04-29 | 山东科技大学 | Device and method suitable for quickly measuring flow resistance of multi-section flow device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108132143A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring method |
| CN112414669A (en) * | 2019-08-21 | 2021-02-26 | 中国石油天然气股份有限公司 | Method for measuring liner tube overcurrent resistance experiment |
| CN112414669B (en) * | 2019-08-21 | 2023-04-25 | 中国石油天然气股份有限公司 | Method for experimental measurement of flow resistance of liner tube |
| CN110470569A (en) * | 2019-09-04 | 2019-11-19 | 中国计量大学 | A kind of capillary pipeline vapour lock measuring device and measuring method |
| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
| CN114414204A (en) * | 2021-12-31 | 2022-04-29 | 山东科技大学 | Device and method suitable for quickly measuring flow resistance of multi-section flow device |
| CN114414204B (en) * | 2021-12-31 | 2023-08-22 | 山东科技大学 | Device and method suitable for rapid measurement of flow resistance of multi-restrictor |
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