CN113819981B - Kerosene flow uncertainty evaluation device and method for liquid oxygen kerosene engine test - Google Patents
Kerosene flow uncertainty evaluation device and method for liquid oxygen kerosene engine test Download PDFInfo
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- 239000003350 kerosene Substances 0.000 title claims abstract description 154
- 238000012360 testing method Methods 0.000 title claims abstract description 150
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000011156 evaluation Methods 0.000 title claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 79
- 238000012545 processing Methods 0.000 claims abstract description 51
- 238000011065 in-situ storage Methods 0.000 claims abstract description 46
- 238000012795 verification Methods 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000011068 loading method Methods 0.000 claims description 55
- 238000009827 uniform distribution Methods 0.000 claims description 25
- 238000012546 transfer Methods 0.000 claims description 23
- 238000004364 calculation method Methods 0.000 claims description 15
- 239000003380 propellant Substances 0.000 claims description 12
- 238000006467 substitution reaction Methods 0.000 claims description 6
- 238000001739 density measurement Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000003786 synthesis reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
-
- 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
- G01F1/05—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 using mechanical effects
- G01F1/20—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 using mechanical effects by detection of dynamic effects of the flow
- G01F1/28—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 using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
Abstract
The invention relates to a kerosene flow uncertainty evaluation device and method for a liquid oxygen kerosene engine test, and aims to solve the technical problem that the uncertainty of kerosene flow measurement cannot be accurately evaluated after an in-situ real medium calibration coefficient of a turbine flowmeter is obtained in the prior art. The device comprises a measuring unit, an in-situ calibration unit, a test bed junction box, a measuring room switching cabinet and a transmission cable network; the measuring unit comprises a turbine flowmeter, a first flow rotating speed preamplifier, a second flow rotating speed preamplifier, a first acquisition processing device, a second acquisition processing device and standard frequency source equipment; the second flow rotating speed preamplifier and the second acquisition processing device are used as backup designs; the in-situ calibration unit comprises a mass flowmeter, a temperature sensor, a slowly-varying signal adapter and constant current source verification equipment. The method realizes the accurate evaluation of the uncertainty of the measurement of the estimated kerosene flow by determining each uncertainty component.
Description
Technical Field
The invention relates to a kerosene flow uncertainty evaluation device, in particular to a kerosene flow uncertainty evaluation device and method for a liquid oxygen kerosene engine test.
Background
With the gradual maturity of the development of a new generation of nontoxic and pollution-free liquid oxygen kerosene engine, the liquid oxygen kerosene engine becomes a main power liquid rocket engine of various carrier rockets, bears a series of carrier launching tasks such as lunar exploration, deep space exploration and the like, and plays an irreplaceable role in the rapid development of aerospace technology.
Different from the conventional propellant liquid rocket engines, each liquid oxygen kerosene engine needs to be subjected to ground process verification tests before delivery and flight, so that performance data such as thrust, specific impulse, mixing ratio and the like of each engine under standard conditions are obtained, and basis is provided for rocket overall trajectory calculation and propellant filling quantity setting. In the engine ground test, the measurement accuracy of each measurement parameter is ensured, and the acquisition of real and credible performance data is one of the purposes of the engine test.
The kerosene flow is one of the key parameters that must be accurately measured in liquid oxygen kerosene engine tests, and is closely related to the engine specific impulse and mixing ratio data. In order to obtain flow data of an engine test process, particularly a starting section, the liquid oxygen kerosene engine adopts a mode of installing a plurality of turbine flowmeters in series based on the characteristics of good repeatability, short lag time, small pressure loss and wide applicable temperature range of the turbine flowmeters, and can measure the kerosene flow more reliably. However, in the actual use process, the laboratory verification environment of the turbine flowmeter is different from the actual use environment, so that certain deviation exists in the kerosene flow measurement data. In the 'turbine flowmeter in-situ calibration method applied to a test site' of the Chinese patent with publication number of CN109781193A, the in-situ real medium calibration coefficient of the turbine flowmeter is obtained through the research of the flow in-situ calibration technology, so that the measurement error of kerosene flow is reduced, and the uncertainty of kerosene flow measurement is reduced. However, there is no method for evaluating the uncertainty of the flow rate of kerosene specially used for the liquid oxygen kerosene engine test, so that the accuracy of the measurement of the flow rate of kerosene can be further improved, and therefore, a device and a method for accurately evaluating the uncertainty of the measurement of the flow rate of kerosene on the basis of the method are needed.
Disclosure of Invention
The invention aims to solve the technical problem that the uncertainty of kerosene flow measurement cannot be accurately estimated after the in-situ real medium calibration coefficient of a turbine flowmeter is obtained in the prior art, and provides a kerosene flow uncertainty estimation device and method for a liquid oxygen kerosene engine test.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
the kerosene flow uncertainty evaluation device for the liquid oxygen kerosene engine test is characterized in that:
the device comprises a measuring unit, an in-situ calibration unit, a test bed junction box, a measuring room switching cabinet and a transmission cable network;
the transmission cable network comprises a movable cable, a transmission cable, a transfer cable and a collection cable;
the measuring unit comprises a turbine flowmeter, a first flow rotating speed preamplifier, a second flow rotating speed preamplifier, a first acquisition processing device, a second acquisition processing device and standard frequency source equipment; the second flow rotating speed preamplifier and the second acquisition processing device are used as backup designs;
the in-situ calibration unit comprises a mass flowmeter, a temperature sensor, a slowly-varying signal adapter and constant current source verification equipment;
the turbine flowmeter, the mass flowmeter and the temperature sensor are connected with corresponding input ends of the test bed junction box through movable cables; the corresponding output ends of the test bed junction box are respectively connected with the input end of the measuring room transfer cabinet through transmission cables, the output end of the measuring room transfer cabinet corresponding to the turbine flowmeter is divided into two paths, the corresponding output ends of the measuring room transfer cabinet are respectively connected with the input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier through transfer cables, and the output ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are respectively connected with the input ends of the first acquisition processing device and the second acquisition processing device through acquisition cables; the output ends of the measuring room transfer cabinet corresponding to the mass flowmeter and the temperature sensor are connected with the corresponding input ends of the slow-change signal adapter through transfer cables, and the output ends of the slow-change signal adapter are connected with the corresponding input ends of the first acquisition processing device and the second acquisition processing device; the output end of the standard frequency source device is connected with the corresponding input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier, and the output end of the constant current source checking device is connected with the input end of the slowly-varying signal adapter;
the turbine flowmeter is a volume flow measurement sensor;
the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are used for shaping, amplifying, filtering, signal switching and signal testing output frequency signals of the turbine flowmeter;
the standard frequency source equipment is used for simulating a frequency signal of an output signal of the turbine flowmeter in a field loading test, independently applying a frequency standard for a current channel according to a frequency output value of the turbine flowmeter under the test run rated working condition, and calculating a flow value according to the frequency standard;
the mass flowmeter is used as an in-situ calibration standard and is used for providing accurate kerosene mass flow data;
the temperature sensor is used as a calibration aid and used for measuring the temperature of the propellant in the main pipeline of the liquid oxygen kerosene engine so as to acquire the density of the propellant;
the slow-change signal adapter is used for transferring output signals of the mass flowmeter and the temperature sensor;
the constant current source verification equipment simulates a mass flowmeter to output 4mA and 20mA current signals, and performs a checksum loading test on a mass flow measurement channel;
the first acquisition processing device and the second acquisition processing device are respectively used for acquiring and processing signals output by the first flow rotating speed preamplifier, the second flow rotating speed preamplifier and the gradual change signal adapter, and the data measured by the mass flowmeter and the temperature sensor are used for carrying out field calibration on the data measured by the turbine flowmeter to obtain a performance equation under test conditions and provide accurate flow data.
Further, the standard frequency source device calculates the flow value using the following formula:
q mf ＝ρ(bf+a)；
wherein q is mf And f is a standard frequency source loading value, b and a are flowmeter calibration coefficients, and ρ is kerosene density.
Meanwhile, the invention also provides a kerosene flow uncertainty evaluation method for the liquid oxygen kerosene engine test, which is characterized by comprising the following steps of:
1) Check mass flow measurement channel
1.1 Using constant current source checking equipment to check the mass flow measuring channel by a current substitution method, wherein the loading current values are 4mA and 20mA respectively, 4mA corresponds to 0kg/s,20mA corresponds to the full range of the mass flowmeter, and an end point method is used for obtaining a mass flow measuring channel checking equation, and the checking equation is as follows:
q mf ＝b 1 U+a 1
wherein q is mf The unit is kg/s for mass flow;
b 1 the unit is kg/(mV.s) for checking the slope;
a 1 for checking the intercept, the unit is kg/s;
u is an acquisition value of an acquisition processing device, and the unit is mV;
1.2 Constant current source loading test)
Carrying out multiple loading tests on 1200kN and 180kN liquid oxygen kerosene engines respectively through constant current source verification equipment, and calculating a flow value measured by a collection processing device when the constant current source verification equipment is subjected to the loading test according to the verification equation in the step 1.1);
1.3 Repeating steps 1.1) and 1.2) a plurality of times;
2) Under the condition of measuring rated flow, measuring uncertainty of each turbine flowmeter, wherein the measuring uncertainty is the uncertainty u of kerosene flow measurement synthesis standard of the turbine flowmeter c (q mf ) The calculation formula is as follows:
u c (q mf )＝(u 2 (cs)+u 2 (ct)+u 2 (ρ)+u 2 (fm)+u 2 (fs)+u 2 (ft)) 1/2
wherein:
u (fs) is a standard uncertainty component introduced by standard frequency source equipment, rated by class B, calculated in uniform distribution using the following formula:
u (ft) is the standard uncertainty introduced by the field loading test, rated according to class a, calculated from the field loading test data in step 1.2) and step 1.3), calculated according to a uniform distribution using the following formula:
wherein:
x i the unit is kg/s, and i is 1-9;
for system flow measurement, the unit is kg/s;
n is the number of loading times, and n is more than or equal to 9;
s (x) is the experimental standard deviation and is calculated according to a Bessel formula;
u (fm) is the standard uncertainty introduced by the frequency measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ρ) is the standard uncertainty introduced by the density measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ct) is the standard uncertainty introduced by the in-situ calibration test, and is rated according to class a, and is calculated according to in-situ calibration test data by using the following formula:
wherein:
q mzi for the measurement of the flow of the mass flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
for the measurement of the flow of the turbine flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
m is the in-situ calibration times, and m is more than or equal to 8; the specific value of m is determined according to the product of the number of calibration points and the number of calibration times of an in-situ calibration test, the number of the calibration points is more than or equal to 4, and the number of the calibration times of each calibration point is more than or equal to 2;
u (cs) is the uncertainty of the kerosene flow in-situ calibration standard, and is calculated by the following formula:
wherein:
u 1 (cs) standard uncertainty introduced for the mass flowmeter, based on the selected mass flowmeter itselfIs rated according to class B, calculated as a uniform distribution using the following formula:
for the 1200kN liquid oxygen kerosene engine test, q mf ＝112kg/s；
For a 180kN liquid oxygen kerosene engine test, q mf ＝16kg/s；
u 2 (cs) determining the current kerosene mass flow q for the standard uncertainty component introduced by the constant current source according to the performance parameters of the selected constant current source verification equipment mf The kerosene flow variation delta q introduced below mf According to class B, the calculation is performed according to a uniform distribution using the following formula:
for a 1200kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA;
for a 180kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA;
u 3 (cs) is a standard uncertainty introduced by the acquisition system, and is evaluated by class B according to the uncertainty of the acquisition system of 0.1%, and calculated by the following formula according to uniform distribution:
u 4 (cs) is the standard uncertainty introduced by the field loading test, is rated according to class A, and is calculated according to the field 20mA current loading test data, wherein the calculation formula is as follows:
3) Calculating measurement uncertainty of each turbine flowmeter in the plurality of turbine flowmeters connected in series, and converting the measurement uncertainty into relative standard uncertainty u c (q mf )％：
4) And selecting the maximum value of the corresponding relative standard uncertainties of the plurality of turbine flowmeters as the final kerosene flow measurement uncertainty.
Further, step 1.1) is specifically that the specific mode of verification is as follows:
according to the full scale range of the mass flowmeter, using a constant current source to carry out current substitution method calibration, obtaining a calibration coefficient b by adopting an endpoint method, wherein the calibration value of a 1200kN liquid oxygen kerosene engine is 4mA, 20mA, and the standard value is 0kg/s and 150kg/s 1 、a 1 The method comprises the steps of carrying out a first treatment on the surface of the 180kN liquid oxygen kerosene engine, the check coefficient is 4mA, 20mA, standard value is 0kg/s, 25kg/s, the check coefficient b is obtained by adopting endpoint method 1 、a 1 。
Further, step 1.3) is specifically, steps 1.1) and 1.2) are repeated two more times.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the kerosene flow uncertainty evaluation device and method for the liquid oxygen kerosene engine test, provided by the invention, through a field in-situ calibration technology, the in-situ real medium calibration coefficient of the turbine flowmeter for measuring the kerosene flow is obtained, the kerosene flow measurement error is reduced, and the kerosene flow measurement uncertainty is reduced; and then, by analyzing the components of the in-situ calibration unit and the measurement unit, each uncertainty component is determined, and further, the accurate evaluation of the uncertainty of the measurement of the estimated kerosene flow is realized.
2. In the kerosene flow uncertainty evaluation device and method for the liquid oxygen kerosene engine test, the same calibration standard is adopted for field calibration, and the kerosene flow measurement values of a plurality of turbine flowmeters can be used for providing test data, so that the accuracy and reliability of test data acquisition are ensured.
3. The device and the method for evaluating the uncertainty of the kerosene flow for the liquid oxygen kerosene engine test realize the accurate evaluation of the uncertainty of the flow measurement and lay a foundation for rocket trajectory calculation and propellant filling.
Drawings
FIG. 1 is a schematic diagram of a kerosene flow uncertainty evaluation device for a liquid oxygen kerosene engine test according to the present invention;
FIG. 2 is a schematic illustration of the determination of magnitude transfer according to the in situ calibration principle of system composition and kerosene flow in accordance with the present invention;
FIG. 3 is a schematic illustration of a kerosene flow uncertainty evaluation method for liquid oxygen kerosene engine testing of the present invention;
FIG. 4 is a graph of test data of a 1200kN engine in the embodiment of the invention, wherein the abscissa is time, the unit is s, the ordinate is mass flow, the unit is kg/s, and qmf, qmf2 and qmf3 correspond to a first position, a second position and a turbine flowmeter arranged in front of a kerosene pump of a main kerosene pipeline respectively;
FIG. 5 is a graph of 180kN engine test data in an embodiment of the invention, with time on the abscissa, mass flow on the ordinate, kg/s on the ordinate, qmfz corresponding to the mass flow meter installed at the first kerosene main line position, and qmf and qmf corresponding to the second kerosene main line position and the turbine flow meter installed at the front kerosene pump line, respectively, and the measured volume flow is converted to mass flow.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The kerosene flow uncertainty evaluation device for the liquid oxygen kerosene engine test disclosed by the invention is shown in fig. 1, and comprises a measurement unit, an in-situ calibration unit, a test bed junction box, a measurement room switching cabinet and a transmission cable network (comprising a movable cable, a transmission cable, a switching cable and a collection cable); the measuring unit comprises a turbine flowmeter, a first flow rotating speed preamplifier, a second flow rotating speed preamplifier, a first acquisition processing device, a second acquisition processing device and standard frequency source equipment; the second flow rotating speed preamplifier and the second acquisition processing device are used as backup designs; the in-situ calibration unit comprises a mass flowmeter, a temperature sensor, a slowly-varying signal adapter and constant current source verification equipment; the turbine flowmeter, the mass flowmeter and the temperature sensor are connected with corresponding input ends of the test bed junction box through movable cables; the corresponding output ends of the test bed junction box are respectively connected with the input end of the measuring room transfer cabinet through transmission cables, the output end of the measuring room transfer cabinet corresponding to the turbine flowmeter is divided into two paths, the corresponding output ends of the measuring room transfer cabinet are respectively connected with the input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier through transfer cables, and the output ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are respectively connected with the input ends of the first acquisition processing device and the second acquisition processing device through acquisition cables; the output ends of the measuring room transfer cabinet corresponding to the mass flowmeter and the temperature sensor are connected with the corresponding input ends of the slow-change signal adapter through transfer cables, and the output ends of the slow-change signal adapter are connected with the corresponding input ends of the first acquisition processing device and the second acquisition processing device; the output end of the standard frequency source device is connected with the corresponding input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier, and the output end of the constant current source checking device is connected with the input end of the slowly-varying signal adapter; the turbine flowmeter is a volume flow measurement sensor; the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are used for shaping, amplifying, filtering, signal switching and signal testing output frequency signals of the turbine flowmeter; the standard frequency source device is used for simulating a frequency signal of a turbine flowmeter output signal in a field loading test, and the field loading test is used for independently applying a frequency standard to a current channel according to a frequency output value of the turbine flowmeter under test run rated working conditions and calculating a flow value according to the frequency standard; the mass flowmeter is used as an in-situ calibration standard and is used for providing accurate kerosene mass flow data; the temperature sensor is used as a calibration aid and used for measuring the temperature of the propellant in the main pipeline of the liquid oxygen kerosene engine so as to acquire the density of the propellant; the slow-change signal adapter is used for transferring output signals of the mass flowmeter and the temperature sensor; the output of the constant current source checking device is an adjustable current signal, and after the current setting is finished, the output value is constant and is used for simulating the mass flowmeter to output 4mA and 20mA current signals and performing a check sum loading test on a mass flow measuring channel; the first acquisition processing device and the second acquisition processing device are respectively used for acquiring and processing signals output by the first flow rotating speed preamplifier, the second flow rotating speed preamplifier and the gradual change signal adapter, and the data measured by the mass flowmeter and the temperature sensor are used for carrying out field calibration on the data measured by the turbine flowmeter to obtain a performance equation under test conditions and provide accurate flow data.
The kerosene flow uncertainty evaluation method for the liquid oxygen kerosene engine test is based on a kerosene flow uncertainty evaluation device for the liquid oxygen kerosene engine test and comprises the following steps of:
1) Check measuring channel
1.1 Using constant current source checking equipment to check the mass flow measuring channel by a current substitution method, wherein the loading current values are 4mA and 20mA respectively, 4mA corresponds to 0kg/s,20mA corresponds to the full range of the mass flowmeter, and an end point method is used for obtaining a mass flow measuring channel checking equation, and the checking equation is as follows:
q mf ＝b 1 U+a 1
wherein q is mf The unit is kg/s for mass flow;
b 1 the unit is kg/(mV.s) for checking the slope;
a 1 for checking the intercept, the unit iskg/s；
U is the acquisition value of the acquisition processing device, mV;
1.2 Constant current source loading test)
Carrying out multiple loading tests on 1200kN and 180kN liquid oxygen kerosene engines respectively through constant current source verification equipment, and calculating a flow value measured by a collection processing device when the constant current source verification equipment is subjected to the loading test according to the verification equation in the step 1.1);
1.3 Repeating steps 1.1) and 1.2) a plurality of times;
2) Under the condition of measuring rated flow, measuring uncertainty of each turbine flowmeter, wherein the measuring uncertainty is the uncertainty u of kerosene flow measurement synthesis standard of the turbine flowmeter c (q mf ) The calculation formula is as follows:
u c (q mf )＝(u 2 (cs)+u 2 (ct)+u 2 (ρ)+u 2 (fm)+u 2 (fs)+u 2 (ft)) 1/2 ；
in the method, in the process of the invention,
u (fs) is a standard uncertainty component introduced by standard frequency source equipment, and is evaluated according to class B (unlike class a evaluation methods) and calculated according to uniform distribution by using the following formula:
u (ft) is the standard uncertainty introduced by the field loading test, calculated from the field loading test data in step 1.2) and step 1.3) according to a class a assessment (i.e., an assessment of the measured uncertainty component of the magnitude measured under the specified measurement conditions by means of statistical analysis), calculated according to a uniform distribution using the following formula:
wherein:
x i the unit is kg/s, and i is 1-9;
for system flow measurement, the unit is kg/s;
n is the number of loading times, and n is more than or equal to 9;
s (x) is the experimental standard deviation and is calculated according to a Bessel formula;
u (fm) is the standard uncertainty introduced by the frequency measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ρ) is the standard uncertainty introduced by the density measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ct) is the standard uncertainty introduced by the in-situ calibration test, and is rated according to class a, and is calculated according to in-situ calibration test data by using the following formula:
wherein:
q mzi for the measurement of the flow of the mass flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
for the measurement of the flow of the turbine flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
m is the in-situ calibration times, and m is more than or equal to 8; the specific value of m is determined according to the product of the number of calibration points and the number of calibration times of an in-situ calibration test, the number of the calibration points is not less than 4, and the number of the calibration times of each calibration point is not less than 2;
u (cs) is the uncertainty of the kerosene flow in-situ calibration standard, and is calculated by the following formula:
wherein:
u 1 (cs) standard uncertainty introduced for the mass flowmeter, based on the uncertainty of the selected mass flowmeter itself, 0.15%, rated by class B, calculated as a uniform distribution using the following formula:
for the 1200kN liquid oxygen kerosene engine test, q mf ＝112kg/s；
For a 180kN liquid oxygen kerosene engine test, q mf ＝16kg/s；
u 2 (cs) determining the current kerosene mass flow q for the standard uncertainty component introduced by the constant current source according to the performance parameters of the selected constant current source verification equipment mf The kerosene flow variation delta q introduced below mf According to class B, the calculation is performed according to a uniform distribution using the following formula:
for a 1200kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA;
for a 180kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA.
u 3 (cs) is a standard uncertainty introduced by the acquisition system, and is evaluated by class B according to the uncertainty of the acquisition system of 0.1%, and calculated by the following formula according to uniform distribution:
u 4 (cs) is the standard uncertainty introduced by the field loading test, is rated according to class A, and is calculated according to the field 20mA current loading test data, wherein the calculation formula is as follows:
3) Calculating measurement uncertainty of each turbine flowmeter in the plurality of turbine flowmeters connected in series, and converting the measurement uncertainty into relative standard uncertainty u c (q mf )％：
4) And selecting the maximum value of the corresponding relative standard uncertainties of the plurality of turbine flowmeters as the final kerosene flow measurement uncertainty.
In step 1.1), the specific mode of verification is as follows:
according to the full scale range of the mass flowmeter, using a constant current source to carry out current substitution method calibration, obtaining a calibration coefficient b by adopting an endpoint method, wherein the calibration value of a 1200kN liquid oxygen kerosene engine is 4mA, 20mA, and the standard value is 0kg/s and 150kg/s 1 、a 1 The method comprises the steps of carrying out a first treatment on the surface of the 180kN liquid oxygen kerosene engine, the check coefficient is 4mA, 20mA, standard value is 0kg/s, 25kg/s, the check coefficient b is obtained by adopting endpoint method 1 、a 1 。
The specific method of the class A evaluation and the class B evaluation is carried out according to JJF1059.1-2012 measurement uncertainty evaluation and representation.
Specifically:
1. the kerosene flow measuring system (namely the kerosene flow uncertainty evaluating device for the liquid oxygen kerosene engine test) comprises a turbine flowmeter, a test bed junction box, a measuring room switching cabinet, a flow rotating speed preamplifier, a data acquisition processing device and the like, wherein the turbine flowmeter is installed in series with a plurality of turbine flowmeters installed on a propellant supply pipeline. Because the system is provided with the mass flowmeter, a slowly-changing signal adapter is also needed.
Mass flowmeter: an in situ calibration standard for providing accurate kerosene mass flow data.
Turbine flowmeter: kerosene volume flow measuring sensor.
The mass flowmeter is adopted for on-site calibration, so that a performance equation of the turbine flowmeter under test conditions can be obtained, and accurate flow data can be provided.
Temperature sensor: the method is used for measuring the temperature of the propellant in the main pipeline and calculating the density of the propellant.
A ramp signal adaptor: the system has the function of switching output signals of the temperature sensor and the mass flowmeter and realizing additional standard test and system verification.
Flow pre-amplifier: the device is used for realizing the functions of shaping, amplifying, filtering, signal switching, signal testing and the like of the output frequency signal of the turbine flowmeter. The first flow preamplifier and the second flow preamplifier are respectively matched with the first acquisition processing device and the second acquisition processing device.
A movable cable: and transmitting output signals of the turbine flowmeter, the temperature sensor and the mass flowmeter to a test bed junction box.
A transmission cable: and transmitting output signals of the mass flowmeter, the turbine flowmeter and the temperature sensor to a measuring room switching cabinet through a test bed junction box.
And (3) switching the cable: and transmitting output signals of the mass flowmeter, the turbine flowmeter and the temperature sensor to the slowly-varying signal adapter and the input end of the flow preamplifier through the measuring room switching cabinet.
Acquisition cable: and transmitting output signals of the slowly-changing signal adapter and the flow pre-amplifier to the acquisition and processing device.
The acquisition processing device comprises: and acquiring and processing the output signal of the buffer signal adapter to obtain mass flow, volume flow and temperature data in the test process. The first acquisition processing device and the second acquisition processing device are different acquisition devices.
2. Magnitude transfer diagram
As shown in fig. 2, the magnitude transfer diagram is determined based on the system composition and kerosene flow in situ calibration principles.
3. Determining kerosene flow uncertainty assessment component
As shown in fig. 3, the kerosene flow measurement uncertainty component is determined and evaluated from the kerosene flow uncertainty evaluation device for liquid oxygen kerosene engine test and the kerosene flow uncertainty evaluation method for liquid oxygen kerosene engine test (kerosene flow measurement system composition and kerosene flow calculation method):
1. evaluation of uncertainty of kerosene flow in-situ calibration reference standard
When the current signal output by the mass flowmeter is measured, the current signal is converted into a voltage signal, and in order to obtain the mass flow, the constant current source checking equipment is adopted to check a measuring system, and the acquisition unit is used for acquisition. Such as: the mass flowmeter, the constant current source verification equipment, the verification method of the acquisition channel, the data acquisition processing device and the like are all uncertainty evaluation components of the calibration standard.
1.1 standard uncertainty u introduced by Mass flowmeter 1 (cs)
And evaluating the uncertainty component of the kerosene flow measurement under the rated working condition according to the uncertainty of the mass flowmeter of 0.15%. 1200kN liquid oxygen kerosene engine test, q mf =112 kg/s;180kN liquid oxygen kerosene engine test, q mf =16 kg/s, the uncertainty component is rated according to class B, calculated as uniform distribution, see formula (1)
1.2 Standard uncertainty u introduced by constant current source 2 (cs)
And loading the mass flow measurement channel by using constant current source checking equipment, wherein the loading values are 4mA and 20mA respectively, the 4mA corresponds to 0kg/s, and the 20mA corresponds to the full range of the mass flowmeter. And obtaining a mass flow check equation of the constant current source check equipment by using an endpoint method. The 1200kN liquid oxygen kerosene engine test was 150kg/s; the 180kN liquid oxygen kerosene engine test is 25kg/s;
the check equations are formulas (2) and (3), respectively:
the uncertainty of the 20mA current standard applied was 0.005% (20 mA x 0.005% = 0.001 mA) according to the constant current source calibration certificate provided in the unit of measure. Substituting the uncertainty data of the constant current source into the formulas (2) and (3) respectively to obtain the kerosene flow variation delta q mf See table 1.
Table 1 standard uncertainty component introduced by constant current source
The standard uncertainty component introduced by the constant current source is rated according to class B, and is uniformly distributed and calculated, see formula (4):
1.3 standard uncertainty introduced by the acquisition SystemDegree of certainty u 3 (s)
Both the linearity and stability indexes of the acquisition and processing device influence the uncertainty of parameter measurement. According to the measurement unit verification result, the uncertainty of the acquisition system is 0.1%, the introduced standard uncertainty is evaluated according to class B, and the measurement unit verification result is uniformly distributed and calculated, see formula (5):
1.4 Standard uncertainty u introduced by Mass flow field Loading test 4 (cs)
This test was performed on 1200kN and 180kN liquid oxygen kerosene engine tests, respectively. Before loading test, a constant current source check device is used for checking a mass flow measurement channel to obtain a check coefficient b 1 And a 1 By means of the checking coefficient b 1 And a 1 And obtaining a check equation of a current measurement channel of the mass flowmeter, and then carrying out a fixed-point loading test. The check and load test is performed in three cycles, each cycle containing one check and three loads.
Standard uncertainty u introduced by field loading test 4 (cs) rated according to class A, calculated according to field 20mA current loading test data, see formula (6):
wherein: x is x i Nine loading tests corresponding to flow values, the unit is kg/s, and i is 1-9;
the 1200kN test bed corresponds to 150kg/s and the 180kN test bed corresponds to 25kg/s;
-collecting a system flow measurement in kg/s;
n-number of loads, n=9.
Kerosene flow in-situ calibration reference standard uncertainty u (cs);
obtaining a calibration reference uncertainty component, namely obtaining a kerosene flow in-situ calibration reference standard uncertainty component u (cs), and calculating according to a formula (7):
1.2 Standard uncertainty u (ct) introduced by in situ calibration experiments
Calibrating the test flow point according to the kerosene flow q under the rated working condition of the engine test mf Determining 6 calibration points, which are respectively 60% q mf 、70％q mf 、80％q mf 、90％q mf 、q mf And 110% q mf . Three passes of six calibration point tapping calibration can be performed, totaling 18 calibration points. According to the actual situation, the number of times of calibrating the low-range calibration point can be reduced, and the number of times of calibrating the rated flow calibration point can be increased.
The standard uncertainty u (ct) introduced by the in-situ calibration test is evaluated according to class A, and is calculated according to the in-situ calibration test data, wherein the calculation method is shown in a formula (8):
wherein:
q mzi for the measurement of the flow of the mass flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
for the measurement of the flow of the turbine flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
m is the in-situ calibration times, and m is more than or equal to 8; specific values of m were determined from 6 calibration points (60% q mf 、70％q mf 、80％q mf 、90％q mf 、100％q mf And 110% q mf ) And determining the product of the calibration times, wherein the number of calibration points is not less than 4The number of times of calibration of each calibration point is not less than 2;
the individual performance of each turbine flowmeter is different, a plurality of turbine flowmeters installed in the test system respectively calculate an uncertainty component u (ct) introduced in an in-situ calibration test of each turbine flowmeter according to a formula (8);
1.2 Density measurement introduced Standard uncertainty u (ρ)
The kerosene temperature is measured by an armored platinum resistance temperature sensor, and the kerosene density is calculated according to an empirical formula by measuring the kerosene temperature. Uncertainty u of temperature measurement t =0.2 ℃, the effect on density is 0.017%. The standard uncertainty introduced by density measurement is rated according to class B, and the uniform distribution is calculated, see formula (9):
1.3 Standard uncertainty u (fm) introduced by frequency measurement System
The frequency signal output by the turbine flowmeter is measured by a frequency quantity acquisition device (namely an acquisition processing device). The linearity and stability of the acquisition and processing device influence the measurement of the frequency quantity, and influence the uncertainty of the flow measurement.
The uncertainty u (fm) of the frequency quantity acquisition device is 0.1%, the standard uncertainty introduced by the frequency quantity measurement system is evaluated according to class B, and the standard uncertainty is calculated in a uniform distribution manner, and is shown in a formula (10):
1.4 Standard uncertainty u (ft) introduced by frequency field Loading test
And (3) carrying out field loading test by using standard frequency source equipment, independently applying frequency standard to each channel according to the frequency output value under the test run rated working condition of a single turbine flowmeter, calculating the flow value according to the standard, and carrying out the test for 9 times.
The standard uncertainty u (ft) introduced by the field loading test is rated according to class A, and is calculated according to the field loading test data, wherein the calculation method is shown in a formula (11):
wherein: x is x i Nine loading tests corresponding to flow values, i being 1-9 kg/s;
-collecting system flow measurements, kg/s; />
n-number of loads, n=9;
1.5 Standard uncertainty u (fs) introduced by frequency Source
The frequency source uncertainty was 0.05% based on the assay unit measurement. The standard uncertainty component u (fs) introduced by the frequency source is rated according to class B, and is calculated by uniform distribution, see formula (12):
1.6 evaluation of uncertainty in kerosene flow measurement
According to the formula (13), under the condition of rated flow, the uncertainty of the kerosene flow measurement synthesis standard of each turbine flowmeter arranged in the test system is calculated:
u c (q mf )＝(u 2 (cs)+u 2 (ct)+u 2 (ρ)+u 2 (fm)+u 2 (fs)+u 2 (ft)) 1/2 (13)
the uncertainty of the kerosene flow measurement is expressed by adopting the relative standard uncertainty, and the calculation method is shown in a formula (14):
and the maximum value in the evaluation results of the multiple turbine flowmeters is selected to represent the uncertainty of the kerosene flow measurement.
The kerosene flow uncertainty evaluation method for the liquid oxygen kerosene engine test (namely, the kerosene flow measurement uncertainty evaluation method for the liquid oxygen kerosene engine test) is applied to the kerosene flow measurement systems for the liquid oxygen kerosene engine test of 1200kN and 180kN, the in-situ calibration coefficient of the kerosene turbine flowmeter is obtained through the mass flowmeter, the uncertainty component is obtained through analyzing the composition structure of the kerosene flow measurement system, the uncertainty of the kerosene flow measurement is accurately obtained, and the design index requirement that the uncertainty is lower than 0.7% is met.
In a test, the mass flowmeter is compared with the turbine flowmeter measurement data, see fig. 4 and 5. The data in fig. 4 are analyzed, and the fluctuation amounts of the three turbine flowmeters are different due to the individual performance difference of the turbine flowmeters, but the data change trend is consistent and the measurement average value is consistent from the data curves of the three turbine flowmeters installed on the main pipeline, so that the index requirement that the uncertainty is lower than 0.7% is met. And analyzing the data of fig. 5, wherein the data curves of the mass flowmeter and the turbine flowmeter installed on the main pipeline have the same trend, the measured average value is the same, and the design technical index requirement is met.
Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.
Claims (5)
1. The utility model provides a kerosene flow uncertainty evaluation device for liquid oxygen kerosene engine test which characterized in that:
the device comprises a measuring unit, an in-situ calibration unit, a test bed junction box, a measuring room switching cabinet and a transmission cable network;
the transmission cable network comprises a movable cable, a transmission cable, a transfer cable and a collection cable;
the measuring unit comprises a turbine flowmeter, a first flow rotating speed preamplifier, a second flow rotating speed preamplifier, a first acquisition processing device, a second acquisition processing device and standard frequency source equipment; the second flow rotating speed preamplifier and the second acquisition processing device are used as backup designs;
the in-situ calibration unit comprises a mass flowmeter, a temperature sensor, a slowly-varying signal adapter and constant current source verification equipment;
the turbine flowmeter, the mass flowmeter and the temperature sensor are connected with corresponding input ends of the test bed junction box through movable cables; the corresponding output ends of the test bed junction box are respectively connected with the input end of the measuring room transfer cabinet through transmission cables, the output end of the measuring room transfer cabinet corresponding to the turbine flowmeter is divided into two paths, the corresponding output ends of the measuring room transfer cabinet are respectively connected with the input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier through transfer cables, and the output ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are respectively connected with the input ends of the first acquisition processing device and the second acquisition processing device through acquisition cables; the output ends of the measuring room transfer cabinet corresponding to the mass flowmeter and the temperature sensor are connected with the corresponding input ends of the slow-change signal adapter through transfer cables, and the output ends of the slow-change signal adapter are connected with the corresponding input ends of the first acquisition processing device and the second acquisition processing device; the output end of the standard frequency source device is connected with the corresponding input ends of the first flow rotating speed preamplifier and the second flow rotating speed preamplifier, and the output end of the constant current source checking device is connected with the input end of the slowly-varying signal adapter;
the turbine flowmeter is a volume flow measurement sensor;
the first flow rotating speed preamplifier and the second flow rotating speed preamplifier are used for shaping, amplifying, filtering, signal switching and signal testing output frequency signals of the turbine flowmeter;
the standard frequency source equipment is used for simulating a frequency signal of an output signal of the turbine flowmeter in a field loading test, independently applying a frequency standard for a current channel according to a frequency output value of the turbine flowmeter under the test run rated working condition, and calculating a flow value according to the frequency standard;
the mass flowmeter is used as an in-situ calibration standard and is used for providing accurate kerosene mass flow data;
the temperature sensor is used as a calibration aid and used for measuring the temperature of the propellant in the main pipeline of the liquid oxygen kerosene engine so as to acquire the density of the propellant;
the slow-change signal adapter is used for transferring output signals of the mass flowmeter and the temperature sensor;
the constant current source verification equipment simulates a mass flowmeter to output 4mA and 20mA current signals, and performs a checksum loading test on a mass flow measurement channel;
the first acquisition processing device and the second acquisition processing device are respectively used for acquiring and processing signals output by the first flow rotating speed preamplifier, the second flow rotating speed preamplifier and the gradual change signal adapter, and the data measured by the mass flowmeter and the temperature sensor are used for carrying out field calibration on the data measured by the turbine flowmeter to obtain a performance equation under test conditions and provide accurate flow data.
2. The kerosene flow uncertainty evaluation device for liquid oxygen kerosene engine test according to claim 1, wherein:
the standard frequency source device calculates a flow value using the following formula:
q mf ＝ρ(bf+a)；
wherein q is mf And f is a standard frequency source loading value, b and a are flowmeter calibration coefficients, and ρ is kerosene density.
3. A kerosene flow uncertainty evaluation method for liquid oxygen kerosene engine test, characterized by comprising the steps of:
1) Check mass flow measurement channel
1.1 Using constant current source checking equipment to check the mass flow measuring channel by a current substitution method, wherein the loading current values are 4mA and 20mA respectively, 4mA corresponds to 0kg/s,20mA corresponds to the full range of the mass flowmeter, and an end point method is used for obtaining a mass flow measuring channel checking equation, and the checking equation is as follows:
q mf ＝b 1 U+a 1
wherein q is mf The unit is kg/s for mass flow;
b 1 the unit is kg/(mV.s) for checking the slope;
a 1 for checking the intercept, the unit is kg/s;
u is an acquisition value of an acquisition processing device, and the unit is mV;
1.2 Constant current source loading test)
Carrying out multiple loading tests on 1200kN and 180kN liquid oxygen kerosene engines respectively through constant current source verification equipment, and calculating a flow value measured by a collection processing device when the constant current source verification equipment is subjected to the loading test according to the verification equation in the step 1.1);
1.3 Repeating steps 1.1) and 1.2) a plurality of times;
2) Under the condition of measuring rated flow, measuring uncertainty of each turbine flowmeter, wherein the measuring uncertainty is the uncertainty u of kerosene flow measurement synthesis standard of the turbine flowmeter c (q mf ) The calculation formula is as follows:
u c (q mf )＝(u 2 (cs)+u 2 (ct)+u 2 (ρ)+u 2 (fm)+u 2 (fs)+u 2 (ft)) 1/2
wherein:
u (fs) is a standard uncertainty component introduced by standard frequency source equipment, rated by class B, calculated in uniform distribution using the following formula:
u (ft) is the standard uncertainty introduced by the field loading test, rated according to class a, calculated from the field loading test data in step 1.2) and step 1.3), calculated according to a uniform distribution using the following formula:
wherein:
x i the unit is kg/s, and i is 1-9;
for system flow measurement, the unit is kg/s;
n is the number of loading times, and n is more than or equal to 9;
s (x) is the experimental standard deviation and is calculated according to a Bessel formula;
u (fm) is the standard uncertainty introduced by the frequency measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ρ) is the standard uncertainty introduced by the density measurement, rated by class B, calculated as a uniform distribution using the following formula:
u (ct) is the standard uncertainty introduced by the in-situ calibration test, and is rated according to class a, and is calculated according to in-situ calibration test data by using the following formula:
wherein:
q mzi for the measurement of the flow of the mass flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
for the measurement of the flow of the turbine flowmeter in the ith calibration test, the unit is kg/s, and i is 1-m;
m is the in-situ calibration times, and m is more than or equal to 8; the specific value of m is determined according to the product of the number of calibration points and the number of calibration times of an in-situ calibration test, the number of the calibration points is more than or equal to 4, and the number of the calibration times of each calibration point is more than or equal to 2;
u (cs) is the uncertainty of the kerosene flow in-situ calibration standard, and is calculated by the following formula:
wherein:
u 1 (cs) standard uncertainty introduced for the mass flowmeter, based on the uncertainty of the selected mass flowmeter itself, 0.15%, rated by class B, calculated as a uniform distribution using the following formula:
for the 1200kN liquid oxygen kerosene engine test, q mf ＝112kg/s；
For a 180kN liquid oxygen kerosene engine test, q mf ＝16kg/s；
u 2 (cs) determining the current kerosene mass flow q for the standard uncertainty component introduced by the constant current source according to the performance parameters of the selected constant current source verification equipment mf The kerosene flow variation delta q introduced below mf According to class B, the calculation is performed according to a uniform distribution using the following formula:
for a 1200kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA;
for a 180kN liquid oxygen kerosene engine test, the formula for verifying and calculating the mass flow by using constant current source verification equipment is as follows:
wherein I is a loading current value, and the unit is mA;
u 3 (cs) is a standard uncertainty introduced by the acquisition system, and is evaluated by class B according to the uncertainty of the acquisition system of 0.1%, and calculated by the following formula according to uniform distribution:
u 4 (cs) is the standard uncertainty introduced by the field loading test, is rated according to class A, and is calculated according to the field 20mA current loading test data, wherein the calculation formula is as follows:
3) Calculating measurement uncertainty of each turbine flowmeter in the plurality of turbine flowmeters connected in series, and converting the measurement uncertainty into relative standard uncertainty u c (q mf )％：
4) And selecting the maximum value of the corresponding relative standard uncertainties of the plurality of turbine flowmeters as the final kerosene flow measurement uncertainty.
4. The method for evaluating the uncertainty of the flow rate of kerosene for a liquid oxygen kerosene engine test according to claim 3, wherein:
in step 1.1), the specific mode of verification is as follows:
according to the full scale range of the mass flowmeter, using a constant current source to carry out current substitution method calibration, obtaining a calibration coefficient b by adopting an endpoint method, wherein the calibration value of a 1200kN liquid oxygen kerosene engine is 4mA, 20mA, and the standard value is 0kg/s and 150kg/s 1 、a 1 The method comprises the steps of carrying out a first treatment on the surface of the 180kN liquid oxygen kerosene engine, the check coefficient is 4mA, 20mA, standard value is 0kg/s, 25kg/s, the check coefficient b is obtained by adopting endpoint method 1 、a 1 。
5. The kerosene flow uncertainty evaluation method for liquid oxygen kerosene engine test according to claim 3 or 4, wherein:
step 1.3) is specifically, steps 1.1) and 1.2) are repeated twice more.
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