CN107255503A - Oxygen kerosene engine test liquid oxygen mass flow measurement methods - Google Patents
Oxygen kerosene engine test liquid oxygen mass flow measurement methods Download PDFInfo
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- CN107255503A CN107255503A CN201710542431.4A CN201710542431A CN107255503A CN 107255503 A CN107255503 A CN 107255503A CN 201710542431 A CN201710542431 A CN 201710542431A CN 107255503 A CN107255503 A CN 107255503A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/17—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using calibrated reservoirs
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Abstract
In order to solve the technical problem that current oxygen kerosene engine test liquid oxygen flow measurement error is big, the invention provides a kind of oxygen kerosene engine test liquid oxygen mass flow measurement methods, including step:1) live calibrated in situ is carried out to turbine flowmeter, the live calibrated in situ coefficient x of turbine flowmeter is obtained;2) a certain amount of liquid oxygen is filled into liquid oxygen container, stops reading the volume flow registration S ' of turbine flowmeter after filling;3) the temperature T ' of liquid oxygen in the pipeline of turbine flowmeter porch is measuredwWith liquid oxygen pressure P 'w, look into the LIQUID OXYGEN DENSITY ρ ' taken in now turbine flowmeter porch pipelinew;4) utilize step 1) obtain turbine flowmeter live calibrated in situ coefficient x amendment step 2) in turbine flowmeter volume flow registration S ';5) with step 3) obtained LIQUID OXYGEN DENSITY ρ 'wIt is multiplied by step 4) the volume flow registration of revised turbine flowmeter, obtain accurate liquid oxygen mass flow in the pipeline of turbine flowmeter porch.
Description
Technical field
The present invention relates to a kind of oxygen kerosene engine test liquid oxygen mass flow measurement methods.
Background technology
The first purpose of liquid-propellant rocket engine ground experiment is that evaluation is made to the performance of engine, evaluation it is main according to
According to being the mass data that measures in engine test, these data must be accurately credible.Because low-temperature liquid oxygen flow measurement is related to
Factor is more, it is impossible to which direct use quality flowmeter is accurately obtained as normal temperature medium.Therefore, liquid oxygen flow is accurately surveyed
A key link of the amount as oxygen kerosene reseach of engine, is directly connected to the Cost And Performance of liquid rocket.
Current liquid oxygen mass flow by turbine flowmeter measure volume flow be multiplied with the density that measurement temperature is calculated come
Obtain, oxygen kerosene engine test liquid oxygen flow measurement error is big, and main cause is:
(1) turbine flowmeter is volume type sensor, three turbine flowmeters progress of being connected during engine test on pipeline
Instantaneous and average flow measurement.Although three turbine flowmeters are the qualified products for measuring water calibration accuracy 0.5%, scene
Installing environmental conditions is different with metered condition, different using medium, particularly the influence of flowmeter low temperature structure deformation, causes whirlpool
There is larger systematic error in flowmeters measured value.
(2) because liquid oxygen is stablized unlike normal temperature medium, the measurement error of current liquid oxygen temperature is 0.8 DEG C~1.2 DEG C,
± 0.4 DEG C of required precision can not be met.
In the big factor of above-mentioned liquid oxygen flow measurement error, the systematic error produced using metering water calibration factor is main
Factor.Producing reason is no low temperature big flow scene the measurement and calibration system in situ, it is impossible to obtain true medium and scene is special
Flowmeter calibration factor under fixed condition.
The content of the invention
In order to solve the technical problem that current oxygen kerosene engine test liquid oxygen flow measurement error is big, the present invention is provided
A kind of measurement error small oxygen kerosene engine test liquid oxygen mass flow measurement methods.
The technical scheme is that:
Oxygen kerosene engine test liquid oxygen mass flow measurement methods, comprise the following steps:
1) live calibrated in situ is carried out to turbine flowmeter, the live calibrated in situ coefficient x of turbine flowmeter is obtained:
1.1) using the volume of the liquid oxygen container corresponding to the different liquid levels of capacity comparison method of calibration, liquid oxygen is worked out with this
The liquid level of the container-volume table of comparisons;
1.2) segment type liquid level gauge is fixedly mounted in liquid oxygen container, opens the tapping valve of liquid oxygen container, tapping one
Tapping valve is closed after section time t, carrying out processing to the triangular wave that segment type liquid level gauge is returned obtains in tapping time t from liquid oxygen
The average external volume flow of the liquid oxygen of container outflowSpecific method is:
1.2.1) searched according to engine test stationary time segment data processing requirement and mark the ripple of the triangular wave
Peak maximum and trough summit;
1.2.2 the initial time t of engine test stationary time section) is determined1Starting on corresponding segment type liquid level gauge
Section number and finish time t2End section number on corresponding segment type liquid level gauge;
1.2.3) found out in the triangular wave apart from it is described starting section number recently before and after flex point and apart from it is described terminate
The nearest front and rear flex point of section number;
1.2.4 nearby curve carries out fitting a straight line to the nearest front and rear flex point of the starting section number of) adjusting the distance, and obtains first wave
Peak and the first trough, nearby curve carries out fitting a straight line to the nearest front and rear flex point of the end section number of adjusting the distance, and obtains the second ripple
Peak and the second trough;
1.2.5) according to the position of the primary peak, the first trough, secondary peak and the second trough, first wave is determined
Liquid level corresponding to peak, the first trough, secondary peak and the second trough, then in step 1.1) liquid level that weaves is high
The corresponding volume V of primary peak is found out in degree-volume table of comparisons11, the corresponding volume V of the first trough22, secondary peak correspondence
Volume V33, the corresponding volume V of the second trough44;
1.2.6) initial time t is calculated using following interpolation formulas1Corresponding vessel volume V1:
In formula, t11For away from initial time t1Nearest preceding flex point correspondence time, s;t22For away from initial time t1After recently
Flex point correspondence time, s;
1.2.7) finish time t is calculated using following interpolation formulas2Corresponding vessel volume V2:
In formula, t33For away from finish time t2Nearest preceding flex point correspondence time, s;t44For away from finish time t2After recently
Flex point correspondence time, s;
1.2.8) the average external volume flow of the liquid oxygen flowed out in tapping time t from liquid oxygen containerFor:
1.3) in step 1.2) during tapping, liquid oxygen temperature T and liquid oxygen pressure P in measurement liquid oxygen container, turbine flow
Liquid oxygen temperature T in the pipeline of gauge porchwWith liquid oxygen pressure Pw;After tapping terminates, the volume flow of record turbine flowmeter is shown
Number S;
1.4) according to step 1.3) in the liquid oxygen temperature T that measures and liquid oxygen pressure P look into and take specialized handbooks to obtain liquid oxygen container
Interior LIQUID OXYGEN DENSITY ρ, according to liquid oxygen temperature TwWith liquid oxygen pressure PwLook into and take specialized handbooks to obtain in the pipeline of turbine flowmeter porch
LIQUID OXYGEN DENSITY ρw;
1.5) using step 1.4) obtained LIQUID OXYGEN DENSITY ρ is multiplied by the average external volume flowObtain tapping time t
The mean mass flux of the interior liquid oxygen flowed out out of liquid oxygen containerThe liquid oxygen then flowed out in tapping time t out of liquid oxygen container
Mass flow
1.6) with step 1.5) the obtained mass flow Q of liquid oxygenmDivided by the LIQUID OXYGEN DENSITY ρw, when obtaining tapping time t
The actual liquid oxygen volume flow S of turbine flowmeter porchIt is real;
1.7) by the actual liquid oxygen volume flow SIt is realCompared with the volume flow registration S-phase of turbine flowmeter, obtain whirlpool
The live calibrated in situ coefficient x of flowmeters;
2) a certain amount of liquid oxygen is filled into liquid oxygen container, stops reading the volume flow registration of turbine flowmeter after filling
S′;
3) the temperature T of liquid oxygen in the pipeline of turbine flowmeter porch is measuredw' and liquid oxygen pressure Pw', look into and take now turbine flow
LIQUID OXYGEN DENSITY ρ ' in the pipeline of gauge porchw;
4) utilize step 1) obtain turbine flowmeter live calibrated in situ coefficient x amendment step 2) in turbine flowmeter
Volume flow registration S ';
5) with step 3) obtained LIQUID OXYGEN DENSITY ρ 'wIt is multiplied by step 4) volume flow of revised turbine flowmeter shows
Number, obtains accurate liquid oxygen mass flow in the pipeline of turbine flowmeter porch.
Further, above-mentioned steps 1.1) be specially:
1.1.1) volumetric standard is placed on to the platform below of liquid oxygen container, and volumetric standard is fixed and leveling;
1.1.2) tap hole of liquid oxygen container is connected with volumetric standard, and ensures junction ne-leakage;
1.1.3) to liquid oxygen container water filling until overflowing across liquid oxygen container straight length;
1.1.4 the bleeder valve at liquid oxygen container tap hole) is opened, the water in liquid oxygen container is flowed into volumetric standard,
Water in volumetric standard closes the bleeder valve when reaching near volumetric standard nominal capacity scribe line position, records this standard appearance
The volume V of water in deviceMark 1, measurement and record standard container in water temperature TWater 1, measure and record the water temperature T in liquid oxygen container 'Water 1、
Measure and record the environment temperature T at demarcation sceneRing 1, record the liquid level drop-out value h in liquid oxygen container after this tappingDrop 1;
1.1.5) water in volumetric standard is emptied;
1.1.6 the bleeder valve) is again turned on, the water in liquid oxygen container is flowed into volumetric standard, in volumetric standard
Water close the bleeder valve when reaching volumetric standard nominal capacity scribe line position, record the volume of water in this volumetric standard
VMark 2, measurement and record standard container in water temperature TWater 2, measure and record the water temperature T in liquid oxygen container 'Water 2, measure and record mark
The environment temperature T at fixed sceneRing 2, record the liquid level drop-out value h of liquid oxygen container after this tappingDrop 2;
1.1.7) repeat step 1.1.5)~1.1.6), until the water in liquid oxygen container is vented, acquisition during this
VMark 3、TWater 3、T′Water 3、TRing 3、hDrop 3... ..., VMark m、TWater m、T′Water m、TRing m、hM drops;
1.1.8 above-mentioned steps 1.1.4) is utilized)~1.1.7) the middle T obtainedWater 1、T′Water 1And TRing 1Correct VMark 1, TWater 2、T′Water 2With
TRing 2Correct VMark 2... ..., TWater m、T′Water mAnd TRing mCorrect VMark m, obtain V 'Mark 1、V′Mark 2……V′Mark m;
1.1.9) the ambient pressure P at measurement demarcation sceneRing, utilize ambient pressure PRingTo step 1.1.8) obtained V 'Mark 1、
V′Mark 2……V′Mark mIt is modified respectively, the liquid level drop-out value for obtaining liquid oxygen container is hDrop 1、hDrop 2、……、hM dropsWhen the liquid that is discharged
The volume V " that oxygen is actually occupied in oxygen kerosene containerMark 1、V″Mark 2……V″Mark m;
1.1.10) h is pressed successively to bottom direction along liquid oxygen container straight lengthDrop 1、hDrop 2... ..., hM dropsBy liquid oxygen container
M interval is highly divided into, with V "Mark 1Divided by hDrop 1, with V "Mark 2Divided by hDrop 2... ..., with V "Mark mDivided by hM drops, respectively obtain the m
Individual interval interior vessel volume corresponding to per height;
1.1.11) according to step 1.1.10) obtain m it is interval in vessel volume establishment corresponding to per height not
With the vessel volume corresponding to liquid level, liquid level-volume table of comparisons of liquid oxygen container is produced.
Further, in step 2) before, step 1.2 can be repeated several times) -1.7), obtain multiple live calibrated in situ systems
Number;The multiple live calibrated in situ coefficient is averaged, live average calibration coefficient in situ is obtained;In step 4) middle use
The scene average calibration coefficient amendment turbine flowmeter volume registration in situ.
Further, step 1.2.1) search and mark the crest summit of triangular wave and the method on trough summit to be:
1.2.1.1 continuous arithmetic average value filtering) is carried out to triangular wave data;
1.2.1.2 the interior all crests of engine test stationary time section and the corresponding triangular wave summit of trough) are searched;
1.2.1.3 triangular wave summit excessively near in the adjacent time interval of tapping twice) is rejected;
1.2.1.4) reject and be much larger than arithmetic mean of instantaneous value or the abnormal triangular wave summit much smaller than arithmetic mean of instantaneous value;
1.2.1.5 unnecessary triangular wave summit) is rejected according to the alternate principle of peak valley.
Beneficial effects of the present invention:
The present invention by the turbine flowmeter that is used during liquid oxygen flow measurement is carried out the live calibrated in situ of low temperature with
Reduce the systematic error that turbine flowmeter is brought, so as to effectively reduce the measurement error of liquid oxygen flow, measurement result accurately may be used
Letter.
Brief description of the drawings
Fig. 1 is the flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is participated in, oxygen kerosene engine test liquid oxygen flow-measuring method provided by the present invention comprises the following steps:
Step 1 carries out live calibrated in situ to turbine flowmeter:
1.1) using the volume of the liquid oxygen container corresponding to the different liquid levels of capacity comparison method of calibration, liquid oxygen is worked out with this
The liquid level of the container-volume table of comparisons, specific method is:
1.1.1) volumetric standard is placed on to the platform below of liquid oxygen container, and volumetric standard is fixed and leveling;
1.1.2) tap hole of liquid oxygen container is connected with volumetric standard, and ensures junction ne-leakage;
1.1.3) to liquid oxygen container water filling until overflowing across liquid oxygen container straight length;
1.1.4 the bleeder valve at liquid oxygen container tap hole) is opened, the water in liquid oxygen container is flowed into volumetric standard,
Water in volumetric standard closes the bleeder valve when reaching near volumetric standard nominal capacity scribe line position, records this standard appearance
The volume V of water in deviceMark 1, measurement and record standard container in water temperature TWater 1, measure and record the water temperature T in liquid oxygen container 'Water 1、
Measure and record the environment temperature T at demarcation sceneRing 1, record the liquid level drop-out value h in liquid oxygen container after this tappingDrop 1;
1.1.5) water in volumetric standard is emptied;
1.1.6 the bleeder valve) is again turned on, the water in liquid oxygen container is flowed into volumetric standard, in volumetric standard
Water close the bleeder valve when reaching volumetric standard nominal capacity scribe line position, record the volume of water in this volumetric standard
VMark 2, measurement and record standard container in water temperature TWater 2, measure and record the water temperature T in liquid oxygen container 'Water 2, measure and record mark
The environment temperature T at fixed sceneRing 2Record the liquid level drop-out value h of liquid oxygen container after this tappingDrop 2;
1.1.7) repeat step 1.1.5)~1.1.6), until the water in liquid oxygen container is vented, acquisition during this
VMark 3、TWater 3、T′Water 3、TRing 3、hDrop 3... ..., VMark m、TWater m、T′Water m、TRing m、hM drops;
1.1.8 above-mentioned steps 1.1.4) is utilized)~1.1.7) the middle T obtainedWater 1、T′Water 1And TRing 1Correct VMark 1, TWater 2、T′Water 2With
TRing 2Correct VMark 2... ..., TWater m、T′Water mAnd TRing mCorrect VMark m, obtain V 'Mark 1、V′Mark 2……V′Mark m;
1.1.9) the ambient pressure P at measurement demarcation sceneRing, utilize ambient pressure PRingTo step 1.1.8) obtained V 'Mark 1、
V′Mark 2……V′Mark mIt is modified respectively, the liquid level drop-out value for obtaining liquid oxygen container is hDrop 1、hDrop 2、……、hM dropsWhen the liquid that is discharged
The volume V " that oxygen is actually occupied in oxygen kerosene containerMark 1、V″Mark 2……V″Mark m;
1.1.10) h is pressed successively to bottom direction along liquid oxygen container straight lengthDrop 1、hDrop 2... ..., hM dropsBy liquid oxygen container
M interval is highly divided into, with V "Mark 1Divided by hDrop 1, with V "Mark 2Divided by hDrop 2... ..., with V "Mark mDivided by hM drops, respectively obtain the m
Individual interval interior vessel volume corresponding to per height;
1.1.11) according to step 1.1.10) obtain m it is interval in vessel volume establishment corresponding to per height not
With the vessel volume corresponding to liquid level, liquid level-volume table of comparisons of liquid oxygen container is produced.
1.2) segment type liquid level gauge is fixedly mounted in liquid oxygen container, opens the tapping valve of liquid oxygen container, tapping one
Tapping valve is closed after section time t, carrying out processing to the triangular wave that segment type liquid level gauge is returned obtains in tapping time t from liquid oxygen
The average external volume flow of the liquid oxygen of container outflowSpecific method is:
1.2.1) searched according to engine test stationary time segment data processing requirement and mark the ripple of the triangular wave
Peak maximum and trough summit, be specially:
1.2.1.1 continuous arithmetic average value filtering) is carried out to triangular wave data;
1.2.1.2 the interior all crests of engine test stationary time section and the corresponding triangular wave summit of trough) are searched;
1.2.1.3 triangular wave summit excessively near in the adjacent time interval of tapping twice) is rejected;
1.2.1.4) reject and be much larger than arithmetic mean of instantaneous value or the abnormal triangular wave summit much smaller than arithmetic mean of instantaneous value;
1.2.1.5 unnecessary triangular wave summit) is rejected according to the alternate principle of peak valley.
1.2.2 the initial time t of engine test stationary time section) is determined1Starting on corresponding segment type liquid level gauge
Section number and finish time t2End section number on corresponding segment type liquid level gauge;
1.2.3) found out in the triangular wave apart from it is described starting section number recently before and after flex point and apart from it is described terminate
The nearest front and rear flex point of section number;
1.2.4 nearby curve carries out fitting a straight line to the nearest front and rear flex point of the starting section number of) adjusting the distance, and obtains first wave
Peak and the first trough, nearby curve carries out fitting a straight line to the nearest front and rear flex point of the end section number of adjusting the distance, and obtains the second ripple
Peak and the second trough;
1.2.5) according to the position of the primary peak, the first trough, secondary peak and the second trough, first wave is determined
Liquid level corresponding to peak, the first trough, secondary peak and the second trough, then in step 1.1) liquid level that weaves is high
The corresponding volume V of primary peak is found out in degree-volume table of comparisons11, the corresponding volume V of the first trough22, secondary peak correspondence
Volume V33, the corresponding volume V of the second trough44;
1.2.6) initial time t is calculated using following interpolation formulas1Corresponding vessel volume V1:
In formula, t11For away from initial time t1Nearest preceding flex point correspondence time, s;t22For away from initial time t1After recently
Flex point correspondence time, s;
1.2.7) finish time t is calculated using following interpolation formulas2Corresponding vessel volume V2:
In formula, t33For away from finish time t2Nearest preceding flex point correspondence time, s;t44For away from finish time t2After recently
Flex point correspondence time, s;
1.2.8) the average external volume flow of the liquid oxygen flowed out in tapping time t from liquid oxygen containerFor:
1.3) in step 1.2) during tapping, liquid oxygen temperature T and liquid oxygen pressure P in measurement liquid oxygen container, turbine flow
Liquid oxygen temperature T in the pipeline of gauge porchwWith liquid oxygen pressure Pw;After tapping terminates, the volume flow of record turbine flowmeter is shown
Number S;
1.4) according to step 1.3) in the liquid oxygen temperature T that measures and liquid oxygen pressure P look into and take specialized handbooks to obtain liquid oxygen container
Interior LIQUID OXYGEN DENSITY ρ, according to liquid oxygen temperature TwWith liquid oxygen pressure PwLook into and take specialized handbooks to obtain in the pipeline of turbine flowmeter porch
LIQUID OXYGEN DENSITY ρw;
1.5) using step 1.4) obtained LIQUID OXYGEN DENSITY ρ is multiplied by the average external volume flowObtain tapping time t
The mean mass flux of the interior liquid oxygen flowed out out of liquid oxygen containerThe liquid oxygen then flowed out in tapping time t out of liquid oxygen container
Mass flow
1.6) with step 1.5) the obtained mass flow Q of liquid oxygenmDivided by the LIQUID OXYGEN DENSITY ρw, when obtaining tapping time t
The actual liquid oxygen volume flow S of turbine flowmeter porchIt is real;
1.7) by the actual liquid oxygen volume flow SIt is realCompared with the volume flow registration S-phase of turbine flowmeter, obtain whirlpool
The live calibrated in situ coefficient x of flowmeters;
Step 2 fills a certain amount of liquid oxygen into liquid oxygen container, stops reading the volume flow of turbine flowmeter after filling
Registration S '.
The temperature T of liquid oxygen in the pipeline of step 3 measurement turbine flowmeter porchw' and liquid oxygen pressure Pw', look into and take now turbine
LIQUID OXYGEN DENSITY ρ ' in the pipeline of flowmeter porchw。
Step 4 using step 1 obtain turbine flowmeter live calibrated in situ coefficient x amendment step 2) in turbine flow
The volume flow registration S ' of meter.
The LIQUID OXYGEN DENSITY ρ ' that step 5 is obtained with step 3wIt is multiplied by the volume flow of the revised turbine flowmeter of step 4
Registration, obtains accurate liquid oxygen mass flow in the pipeline of turbine flowmeter porch.
In order to improve the live calibrated in situ precision of turbine flowmeter, the step 1.2 in step 1 can be repeated several times)-
1.7) multiple live calibrated in situ coefficients, are respectively obtained, these live calibrated in situ coefficients are averaged, live original position is obtained
Average calibration coefficient;Accordingly, using scene average calibration coefficient amendment turbine flowmeter volume in situ in subsequent step 4
Registration.
Claims (4)
1. oxygen kerosene engine test liquid oxygen mass flow measurement methods, it is characterised in that comprise the following steps:
1) live calibrated in situ is carried out to turbine flowmeter, the live calibrated in situ coefficient x of turbine flowmeter is obtained:
1.1) using the volume of the liquid oxygen container corresponding to the different liquid levels of capacity comparison method of calibration, liquid oxygen container is worked out with this
Liquid level-volume table of comparisons;
1.2) segment type liquid level gauge is fixedly mounted in liquid oxygen container, when opening the tapping valve of liquid oxygen container, one section of tapping
Between tapping valve is closed after t, carrying out processing to the triangular wave that segment type liquid level gauge is returned obtains in tapping time t from liquid oxygen container
The average external volume flow of the liquid oxygen of outflowSpecific method is:
1.2.1) searched according to engine test stationary time segment data processing requirement and mark the crest top of the triangular wave
Point and trough summit;
1.2.2 the initial time t of engine test stationary time section) is determined1Starting section number on corresponding segment type liquid level gauge and
Finish time t2End section number on corresponding segment type liquid level gauge;
1.2.3) found out in the triangular wave apart from the starting section number recently before and after flex point and apart from the end section number
Nearest front and rear flex point;
1.2.4 nearby curve carries out fitting a straight line to the nearest front and rear flex point of the starting section number of) adjusting the distance, obtain primary peak and
First trough, nearby curve carries out fitting a straight line to the nearest front and rear flex point of the end section number of adjusting the distance, obtain secondary peak and
Second trough;
1.2.5) according to the position of the primary peak, the first trough, secondary peak and the second trough, determine primary peak,
Liquid level corresponding to first trough, secondary peak and the second trough, then in step 1.1) liquid level-appearance for weaving
The corresponding volume V of primary peak is found out in the product table of comparisons11, the corresponding volume V of the first trough22, the corresponding volume of secondary peak
V33, the corresponding volume V of the second trough44;
1.2.6) initial time t is calculated using following interpolation formulas1Corresponding vessel volume V1:
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Correspondence time, s;
1.2.7) finish time t is calculated using following interpolation formulas2Corresponding vessel volume V2:
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Correspondence time, s;
1.2.8) the average external volume flow of the liquid oxygen flowed out in tapping time t from liquid oxygen containerFor:
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1.3) in step 1.2) during tapping, liquid oxygen temperature T and liquid oxygen pressure P in measurement liquid oxygen container, turbine flowmeter
Liquid oxygen temperature T in the pipeline of porchwWith liquid oxygen pressure Pw;After tapping terminates, the volume flow registration S of turbine flowmeter is recorded;
1.4) according to step 1.3) in the liquid oxygen temperature T that measures and liquid oxygen pressure P look into and take specialized handbooks to obtain in liquid oxygen container
LIQUID OXYGEN DENSITY ρ, according to liquid oxygen temperature TwWith liquid oxygen pressure PwLook into and take specialized handbooks to obtain the liquid in the pipeline of turbine flowmeter porch
Oxygen density pw;
1.5) using step 1.4) obtained LIQUID OXYGEN DENSITY ρ is multiplied by the average external volume flowObtain in tapping time t from liquid
The mean mass flux of the liquid oxygen of outflow in oxygen containerThe quality of the liquid oxygen then flowed out in tapping time t out of liquid oxygen container
Flow
1.6) with step 1.5) the obtained mass flow Q of liquid oxygenmDivided by the LIQUID OXYGEN DENSITY ρw, obtain turbine during tapping time t
The actual liquid oxygen volume flow S of flowmeter porchIt is real;
1.7) by the actual liquid oxygen volume flow SIt is realCompared with the volume flow registration S-phase of turbine flowmeter, obtain turbine flow
The live calibrated in situ coefficient x of gauge;
2) a certain amount of liquid oxygen is filled into liquid oxygen container, stops reading the volume flow registration S ' of turbine flowmeter after filling;
3) the temperature T ' of liquid oxygen in the pipeline of turbine flowmeter porch is measuredwWith liquid oxygen pressure P 'w, look into and take now turbine flowmeter
LIQUID OXYGEN DENSITY ρ ' in the pipeline of porchw;
4) utilize step 1) obtain turbine flowmeter live calibrated in situ coefficient x amendment step 2) in turbine flowmeter body
Product flow registration S ';
5) with step 3) obtained LIQUID OXYGEN DENSITY ρ 'wIt is multiplied by step 4) the volume flow registration of revised turbine flowmeter, obtain
Accurate liquid oxygen mass flow in turbine flowmeter porch pipeline.
2. oxygen kerosene engine test liquid oxygen mass flow measurement methods according to claim 1, it is characterised in that step
It is rapid 1.1) to be specially:
1.1.1) volumetric standard is placed on to the platform below of liquid oxygen container, and volumetric standard is fixed and leveling;
1.1.2) tap hole of liquid oxygen container is connected with volumetric standard, and ensures junction ne-leakage;
1.1.3) to liquid oxygen container water filling until overflowing across liquid oxygen container straight length;
1.1.4 the bleeder valve at liquid oxygen container tap hole) is opened, the water in liquid oxygen container is flowed into volumetric standard, in standard
Water in container closes the bleeder valve when reaching near volumetric standard nominal capacity scribe line position, records in this volumetric standard
The volume V of waterMark 1, measurement and record standard container in water temperature TWater 1, measure and record the water temperature T in liquid oxygen container 'Water 1, measurement
And record the environment temperature T at demarcation sceneRing 1, record the liquid level drop-out value h in liquid oxygen container after this tappingDrop 1;
1.1.5) water in volumetric standard is emptied;
1.1.6 the bleeder valve) is again turned on, the water in liquid oxygen container is flowed into volumetric standard, the water in volumetric standard
The bleeder valve is closed when reaching volumetric standard nominal capacity scribe line position, the volume V of water in this volumetric standard is recordedMark 2, survey
Measure and the water temperature T in record standard containerWater 2, measure and record the water temperature T in liquid oxygen container 'Water 2, measure and record demarcation scene
Environment temperature TRing 2, record the liquid level drop-out value h of liquid oxygen container after this tappingDrop 2;
1.1.7) repeat step 1.1.5)~1.1.6), until the water in liquid oxygen container is vented, V is obtained during thisMark 3、TWater 3、
TWater′3、TRing 3、hDrop 3... ..., VMark m、TWater m、TWater′m、TRing m、hM drops;
1.1.8 above-mentioned steps 1.1.4) is utilized)~1.1.7) the middle T obtainedWater 1、T′Water 1And TRing 1Correct VMark 1, TWater 2、T′Water 2And TRing 2Repair
Positive VMark 2... ..., TWater m、T′Water mAnd TRing mCorrect VMark m, obtain V 'Mark 1、V′Mark mark 2……V′Mark m;
1.1.9) the ambient pressure P at measurement demarcation sceneRing, utilize ambient pressure PRingTo step 1.1.8) obtained V 'Mark 1、V
′Mark 2……V′Mark mIt is modified respectively, the liquid level drop-out value for obtaining liquid oxygen container is hDrop 1、hDrop 2、……、hM dropsWhen the liquid that is discharged
The volume V " that oxygen is actually occupied in oxygen kerosene containerMark 1、V″Mark 2……V″Mark m;
1.1.10) h is pressed successively to bottom direction along liquid oxygen container straight lengthDrop 1、hDrop 2... ..., hM dropsBy the height of liquid oxygen container
M interval is divided into, with V "Mark 1Divided by hDrop 1, with V "Mark 2Divided by hDrop 2... ..., with V "Mark mDivided by hM drops, respectively obtain the m area
Interior vessel volume corresponding to per height;
1.1.11) according to step 1.1.10) obtain m it is interval in vessel volume corresponding to per height work out different liquid
Vessel volume corresponding to the height of position, produces liquid level-volume table of comparisons of liquid oxygen container.
3. oxygen kerosene engine test liquid oxygen mass flow measurement methods according to claim 1, it is characterised in that
Step 2) before, step 1.2 can be repeated several times) -1.7), obtain multiple live calibrated in situ coefficients;The multiple scene is former
Position calibration factor is averaged, and obtains live average calibration coefficient in situ;In step 4) it is middle using the scene average school in situ
Quasi- coefficient amendment turbine flowmeter volume registration.
4. oxygen kerosene engine test liquid oxygen mass flow measurement methods according to claim 3, it is characterised in that step
Rapid 1.2.1) search and mark the crest summit of triangular wave and the method on trough summit to be:
1.2.1.1 continuous arithmetic average value filtering) is carried out to triangular wave data;
1.2.1.2 the interior all crests of engine test stationary time section and the corresponding triangular wave summit of trough) are searched;
1.2.1.3 triangular wave summit excessively near in the adjacent time interval of tapping twice) is rejected;
1.2.1.4) reject and be much larger than arithmetic mean of instantaneous value or the abnormal triangular wave summit much smaller than arithmetic mean of instantaneous value;
1.2.1.5 unnecessary triangular wave summit) is rejected according to the alternate principle of peak valley.
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