CN109781193A - Turbine flowmeter calibrated in situ method applied to testing ground - Google Patents
Turbine flowmeter calibrated in situ method applied to testing ground Download PDFInfo
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- CN109781193A CN109781193A CN201811499757.4A CN201811499757A CN109781193A CN 109781193 A CN109781193 A CN 109781193A CN 201811499757 A CN201811499757 A CN 201811499757A CN 109781193 A CN109781193 A CN 109781193A
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Abstract
The present invention relates to a kind of turbine flowmeter calibrated in situ method applied to testing ground, solve the problems, such as existing flowmeter method of calibration there are deviation, seriously affect the accuracy of test data.A kind of turbine flowmeter calibrated in situ method applied to testing ground, comprising the following steps: Step 1: establishing calibration system；Step 2: the conversion of mass flowmeter output signal；Step 3: calculating the Measurement channel slope k of mass flowmenter；Step 4: the determination of tapping test calibration point；Step 5: carrying out tapping test；Step 6: live tapping data processing；Step 7: abnormity point elimination；Step 8: three times six grades of tapping are tested；Step 9: calculating turbine flowmeter scene calibrated in situ coefficient；Step 10: calculating the uncertainty of measurement of mass flowmenter maximum rangeStep 11: calculating the uncertainty of measurement u of turbine flowmeterq, so that turbine flow meter calibrating is completed.
Description
Technical field
The present invention relates to turbine flowmeter calibration methods, and in particular to a kind of turbine flowmeter applied to testing ground is former
Position calibration method.
Background technique
In liquid propellant rocket engine test, flow is a kind of key parameter that must accurately measure, the ratio of it and engine
The performance parameters such as punching, mixing ratio are closely related.In order to obtain the data on flows of engine test whole process, while improving test data
Reliability is obtained, generally carries out flow measurement in such a way that more flowmeters are installed in series.Flowmeter is before use, need to test
Room carries out aqueous medium verification, but in actual use, laboratory verification environment, pipeline installation are deposited with practical service environment
In different, furthermore verifies the physical function parameters such as density, viscosity, the temperature of medium and test medium and have differences, adopt
Test flow data are handled with water checkout coefficient, there can be certain deviation.For example, in large-scale oxygen kerosene engine test,
Kerosene oil flow measurement, in terms of test of many times measurement data, three turbine flows are carried out using three heavy caliber room temperature turbine flowmeters
Difference maximum difference 3kg/s between meter or so has seriously affected the accurate offer and subsequent product development of test data
Progress.
Summary of the invention
Present invention aim to address existing flowmeter methods of calibration there are deviation, seriously affects the accuracy of test data
The problem of, a kind of flow calibrated in situ method applied to testing ground environment is provided.
The technical scheme is that
A kind of turbine flowmeter calibrated in situ method applied to testing ground, comprising the following steps:
Step 1: establishing calibration system；
The calibration system includes the mass flowmenter being arranged in series on pipeline and an at least turbine flowmeter；
Step 2: the conversion of mass flowmeter output signal；
Using the method for additional measuring resistance, the current signal that mass flowmenter exports is converted into voltage signal；
Step 3: calculating the Measurement channel slope k of mass flowmenter；
Apply I in standard resistor at two terminals respectively1、I2Current signal obtains I respectively1、I2Corresponding mass flow meter measurement
Channel collection value U1、U2, U1、U2Corresponding standard value is respectively mass flowmenter zero point and maximum range M, utilizes end-point method
The Measurement channel slope k of mass flowmenter is obtained, calculation formula is as follows；
Step 4: the determination of tapping test calibration point；
Multiple tapping tests are determined according to specified section of flow design value of engine test and drop operating condition section flow design value
Calibration point；
Step 5: carrying out tapping test；
Calibration point is tested according to multiple tapping that step 4 determines, minimum tapping test calibration point is chosen and carries out tapping examination
It tests, obtains the collection voltages value U and turbine flowmeter output frequency f in mass flow meter measurement channel during tapping；
Step 6: live tapping data processing；
Tapping after the test, the survey of mass flowmenter is calculated according to the collection voltages value U in mass flow meter measurement channel
Measure data qZ；
qZ=kU
Step 7: abnormity point elimination；
The flow value q of mass flowmenterZIt is linear corresponding relation with turbine flowmeter output frequency f, rejecting is not inconsistent zygonema
The abnormal point of sexual intercourse；
Step 8: three times six grades of tapping are tested；
Calibration point is tested according to multiple tapping that step 4 determines, carries out the tapping test of other tapping test calibration points,
And live tapping data are handled referring to step 6 and step 7；
Step 9: calculating turbine flowmeter scene calibrated in situ coefficient；
Pass through formulaCalculate scene verification slope b in situ, scene verification intercept a in situ；Wherein,
ρ-fluid density, kg/dm3；
The measure theory of turbine flowmeter is calculated according to the scene of acquisition verification slope b in situ, scene verification intercept a in situ
Value qm；
qm=ρ (bf+a) (2)
Calculate the measure theory value q of turbine flowmetermWith the measurement data q of mass flowmenterZDifference DELTA q；
Step 10: calculating the uncertainty of mass flowmenter maximum range
Uncertainty u% and maximum range M according to known to mass flowmenter calculate mass flowmenter maximum range not
Degree of certainty
Step 11: calculating the uncertainty of measurement u of turbine flowmeterq；
According to the uncertainty of mass flowmenter maximum rangeThe measure theory value q of turbine flowmetermWith quality stream
The measurement data q of meterZMaximum difference Δ qmax, calculate the uncertainty of measurement u of turbine flowmeterq, thus turbine flowmeter
Calibration is completed；
Further, the calibration point in step 4 be respectively specified section of flow of engine test 50%, 60%, 70%,
80%, 100%, 110%.
Advantages of the present invention are as follows:
1. the present invention can by measuring quality flowmeter flow quantity, density as calibration benchmark using high quasi- mass flowmenter
Accurately to obtain the equal volume flow of more turbine flowmeters of pipeline installation, obtain that more turbine flowmeters scenes are true to be situated between
Matter calibration slope, intercept solve the problems, such as turbine flowmeter data deviation under same base condition.
2. the method for the present invention carries out field calibration to turbine flowmeter in testing ground environment, using true medium, eliminate
Installation environment, verification medium difference are to the adverse effect of flow measurement.In addition, realizing calibration medium using true medium
Repetitive cycling use, saved financial resources, cost.
3. calibration method through the invention, difference between three flowmeters by original 3kg/s be decreased to 0.5kg/s with
It is interior, it is very close with design value, and each flow measurement measurement uncertainty is superior to 0.5%.
4. in engine test, calibrating by the method for the invention to turbine flowmeter, any stream can be used
The measured value of meter provides test data, greatly improves flow measurement precision.
Detailed description of the invention
Fig. 1 is the turbine flowmeter in-situ calibration system schematic diagram that the present invention is applied to testing ground.
Appended drawing reference: 1- turbine flowmeter, 2- mass flowmenter.
Specific embodiment
Technical solution of the present invention is clearly and completely described with reference to the accompanying drawings of the specification.
In order to improve engine performance parameter measurement accuracy, in engine test site environment, establish with mass flow
It is calculated as the kerosene oil flow in-situ calibration system of calibration benchmark, turbine flowmeter is calibrated using true medium, improves coal
Oil stream amount measurement accuracy.
Mass flowmenter output valve is mass flow, and flow measurement can approximatively think the not physics by measured medium
Parameter and the influence for managing interior flow regime, precision is high in addition, suitable for doing the calibration benchmark of room temperature turbine flowmeter.By true
It is former to carry out scene to more turbine flowmeters being installed on conventional propellant supply line using mass flowmenter for medium tapping
Position calibration, under the conditions of obtaining experimental enviroment, turbine flowmeter original position true medium checkout coefficient, thus during being tested
Mass-flow rate of propellant.
The present invention is applied to the turbine flowmeter in-situ calibration system of testing ground as shown in Figure 1, pilot system uses
The method of three turbine flowmeter series connection measurements, when carrying out live calibrated in situ, turbine flowmeter installation site is remained unchanged.It is existing
Field true medium calibrated in situ flows through turbine flowmeter and flows through the propellant mass of mass flowmenter according to the principle of mass conservation
Flow is equal, by tapping data, carries out scene true medium calibration in situ to turbine flowmeter, obtains checkout coefficient, use
This coefficient handles firing test data, as shown in formula (2) and formula (3)；
qz=qm=ρ (bf+a) (2)
In formula: qzThe measurement data of-mass flowmenter, kg/s；
qmThe measure theory value of-turbine flowmeter, kg/s；
B-scene verifies slope, L/Hz in situ；
A-scene verifies intercept, L in situ；
ρ-fluid density, kg/dm3；
F-turbine flowmeter output frequency value, Hz.
Turbine flowmeter calibrated in situ method provided by the invention applied to testing ground, comprising the following steps:
Step 1: establishing calibration system；
Calibration system includes the mass flowmenter 2 being arranged in series on pipeline and three turbine flowmeters 1；
Step 2: the conversion of mass flowmeter output signal；
Mass flowmenter output is 4mA~20mA current signal, and acquisition equipment can only be acquired voltage signal, use
Mass flowmenter output current signal I is converted to the electricity of suitable acquisition system acquisition by the method for additional 200 ohm of measuring resistances
Press signal U；It is specific as follows: mass flowmeter converter end connect quad, wherein two be positive, negative power line, two
It is positive, negative signal line, provides+30V working power by positive and negative power supply line for mass flowmenter, by believing positive and negative line by matter
Amount flowmeter output current signal by transmission link be transmitted to acquisition equipment input terminal, acquisition device signal input anode,
The additional 200 ohm of measuring resistances of negative terminal；
Step 3: obtaining the Measurement channel slope k of mass flowmenter；
Using standard voltage source, apply I in measuring resistance respectively1=4mA, I2=20mA current signal, obtains respectively
I1、I2Corresponding mass flow meter measurement channel collection value U1、U2, U1、U2Corresponding standard value is respectively 0kg/s and quality stream
Meter maximum range 150kg/s, the flow measurement channel slope k of mass flowmenter is obtained using end-point method, and calculation method is shown in public affairs
Formula (4)；
Step 4: the determination of tapping test calibration point；
According to specified section of kerosene oil flow value (110kg/s) of engine test and drop operating condition section kerosene oil flow design value
(65kg/s) determines that calibration point, respectively 55kg/s (50%), 65kg/s (60%), 75kg/s (70%), 90kg/ are tested in tapping
S (80%), 110kg/s (100%) and 120kg/s (110%) add up to six points, and multiple calibration point measurements can be improved whole
Linear and measurement data the accuracy of flowmeter check equations in a measurement range；
Step 5: carrying out kerosene tapping test；
Calibration point is tested according to multiple tapping that step 4 determines, minimum tapping test calibration point 55kg/s is chosen and is put
Liquid test during tapping, records the collection voltages value U and turbine flowmeter output frequency f in mass flow meter measurement channel；
Step 6: live tapping data processing；
Tapping after the test, handles tapping data；Matter is calculated according to the collection voltages value U in mass flow meter measurement channel
Measure the measurement data q of flowmeterZ；
qZ=kU
Step 7: abnormity point elimination；
It is carried out in data handling procedure according to formula (3), compares flow value qZIt is corresponding with flowmeter output frequency f to close
System, turbine flow are calculated as volume type sensor, flow qZBig then output frequency f high is picked if flow, frequency corresponding relationship are abnormal
Except abnormal point；
Step 8: three times six grades of tapping are tested；
Calibration point is tested according to multiple tapping that step 4 determines, since flow 55kg/s, until maximum stream flow 120kg/s
Data are handled according to step 6 and step 7 every time after the test for one six grades of complete cycle；
Step 9: calculating turbine flowmeter scene calibrated in situ coefficient；
Pass through formula
Calculate scene verification slope b in situ, scene verification intercept a in situ；Wherein, ρ-fluid density, kg/dm3；
The measure theory of turbine flowmeter is calculated according to the scene of acquisition verification slope b in situ, scene verification intercept a in situ
Value qm；
qm=ρ (bf+a) (2)
Calculate the measure theory value q of turbine flowmetermWith the measurement data q of mass flowmenterZDifference DELTA q；
Step 10: quality of evaluation flowmeter uncertainty of measurement
According to mass flowmenter uncertainty 0.15% and maximum range 150kg/s, mass flowmenter maximum range is calculated
Uncertainty
Step 11: calculating the uncertainty of measurement u of turbine flowmeterq；
According to quality flowmeter flow quantity uncertainty of measurementThe measure theory value q of turbine flowmetermWith mass flow
The measurement data q of meterZMaximum difference Δ qmax, turbine flowmeter flow measurement uncertainty u is calculated separately according to formula (6)q,
To which turbine flow meter calibrating is completed；
The present invention obtains turbine flow by testing ground environment turbine flowmeter field calibration using mass flowmenter
Actual performance data under meter experimental condition, and then obtain accurate propellant flow rate.From multiple engine test data
From the point of view of, test process kerosene oil flow measured value is consistent with design value.In testing ground environment, using mass flowmenter conduct
Benchmark is calibrated, can be widely applied to the liquid propellant rocket engine test using conventional propellant.
Claims (2)
1. a kind of turbine flowmeter calibrated in situ method applied to testing ground, which comprises the following steps:
Step 1: establishing calibration system；
The calibration system includes the mass flowmenter being arranged in series on pipeline and an at least turbine flowmeter；
Step 2: the conversion of mass flowmeter output signal；
Using the method for additional measuring resistance, the current signal that mass flowmenter exports is converted into voltage signal；
Step 3: calculating the Measurement channel slope k of mass flowmenter；
Apply I in standard resistor at two terminals respectively1、I2Current signal obtains I respectively1、I2It adopts in corresponding mass flow meter measurement channel
Set value U1、U2, U1、U2Corresponding standard value is respectively mass flowmenter zero point and maximum range M, obtains matter using end-point method
The Measurement channel slope k of flowmeter is measured, calculation formula is as follows；
Step 4: the determination of tapping test calibration point；
Multiple tapping test calibrations are determined according to specified section of flow design value of engine test and drop operating condition section flow design value
Point；
Step 5: carrying out tapping test；
Calibration point is tested according to multiple tapping that step 4 determines, minimum tapping test calibration point is chosen and carries out tapping test, obtain
The collection voltages value U and turbine flowmeter output frequency f in mass flow meter measurement channel during tapping；
Step 6: live tapping data processing；
Tapping after the test, the measurement number of mass flowmenter is calculated according to the collection voltages value U in mass flow meter measurement channel
According to qZ；
qZ=kU
Step 7: abnormity point elimination；
The flow value q of mass flowmenterZIt is linear corresponding relation with turbine flowmeter output frequency f, rejecting does not meet linear relationship
Abnormal point；
Step 8: three times six grades of tapping are tested；
Calibration point is tested according to multiple tapping that step 4 determines, carries out the tapping test of other tapping test calibration points, and is joined
Live tapping data are handled according to step 6 and step 7；
Step 9: calculating turbine flowmeter scene calibrated in situ coefficient；
Pass through formula
Calculate scene verification slope b in situ, scene verification intercept a in situ；Wherein, ρ-fluid density, kg/dm3；
The measure theory value q of turbine flowmeter is calculated according to the scene of acquisition verification slope b in situ, scene verification intercept a in situm；
qm=ρ (bf+a) (2)
Calculate the measure theory value q of turbine flowmetermWith the measurement data q of mass flowmenterZDifference DELTA q；
Step 10: calculating the uncertainty of mass flowmenter maximum range
Uncertainty u% and maximum range M according to known to mass flowmenter calculate the uncertain of mass flowmenter maximum range
Degree
Step 11: calculating the uncertainty of measurement u of turbine flowmeterq；
According to the uncertainty of mass flowmenter maximum rangeThe measure theory value q of turbine flowmetermWith mass flowmenter
Measurement data qZMaximum difference Δ qmax, calculate the uncertainty of measurement u of turbine flowmeterq, so that turbine flow meter calibrating is complete
At；
2. the turbine flowmeter calibrated in situ method according to claim 1 applied to testing ground, it is characterised in that: step
Calibration point in rapid four is respectively 50%, 60%, 70%, 80%, 100%, the 110% of specified section of flow of engine test.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113819981A (en) * | 2021-10-11 | 2021-12-21 | 西安航天动力试验技术研究所 | Device and method for evaluating uncertainty of kerosene flow for liquid oxygen kerosene engine test |
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| JP2005017152A (en) * | 2003-06-27 | 2005-01-20 | Oval Corp | Flowmeter, flow rate calculation method, program and recording medium |
| US6996485B2 (en) * | 2004-06-18 | 2006-02-07 | Gilbarco Inc. | Nullification of measurement error, particularly within a dual turbine flow meter used in a fuel dispenser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113819981A (en) * | 2021-10-11 | 2021-12-21 | 西安航天动力试验技术研究所 | Device and method for evaluating uncertainty of kerosene flow for liquid oxygen kerosene engine test |
| CN113819981B (en) * | 2021-10-11 | 2024-01-12 | 西安航天动力试验技术研究所 | Kerosene flow uncertainty evaluation device and method for liquid oxygen kerosene engine test |
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