CN107255503A - Oxygen kerosene engine test liquid oxygen mass flow measurement methods - Google Patents

Oxygen kerosene engine test liquid oxygen mass flow measurement methods Download PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
liquid oxygen
msub
water
mark
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710542431.4A
Other languages
Chinese (zh)
Inventor
秦永涛
李正兵
郑小萍
李建军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian Aerospace Propulsion Testing Technique Institute
Original Assignee
Xian Aerospace Propulsion Testing Technique Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian Aerospace Propulsion Testing Technique Institute filed Critical Xian Aerospace Propulsion Testing Technique Institute
Priority to CN201710542431.4A priority Critical patent/CN107255503A/en
Publication of CN107255503A publication Critical patent/CN107255503A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

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

Oxygen kerosene engine test liquid oxygen mass flow measurement methods
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:
<mrow> <msub> <mi>V</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>11</mn> </msub> <mo>)</mo> <mo>&amp;times;</mo> <mo>(</mo> <msub> <mi>V</mi> <mn>22</mn> </msub> <mo>-</mo> <msub> <mi>V</mi> <mn>11</mn> </msub> <mo>)</mo> </mrow> <mrow> <msub> <mi>t</mi> <mn>22</mn> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>11</mn> </msub> </mrow> </mfrac> <mo>+</mo> <msub> <mi>V</mi> <mn>11</mn> </msub> <mo>,</mo> </mrow>
In formula, t11For away from initial time t1Nearest preceding flex point correspondence time, s；t22For away from initial time t1Nearest rear flex point Correspondence time, s；
1.2.7) finish time t is calculated using following interpolation formulas2Corresponding vessel volume V2:
<mrow> <msub> <mi>V</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mo>(</mo> <msub> <mi>t</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>33</mn> </msub> <mo>)</mo> <mo>&amp;times;</mo> <mo>(</mo> <msub> <mi>V</mi> <mn>44</mn> </msub> <mo>-</mo> <msub> <mi>V</mi> <mn>33</mn> </msub> <mo>)</mo> </mrow> <mrow> <msub> <mi>t</mi> <mn>44</mn> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>33</mn> </msub> </mrow> </mfrac> <mo>+</mo> <msub> <mi>V</mi> <mn>33</mn> </msub> <mo>,</mo> </mrow>
In formula, t33For away from finish time t2Nearest preceding flex point correspondence time, s；t44For away from finish time t2Nearest rear 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：
<mrow> <msub> <mover> <mi>q</mi> <mo>&amp;OverBar;</mo> </mover> <mrow> <mi>v</mi> <mo>,</mo> <mi>t</mi> </mrow> </msub> <mo>=</mo> <mrow> <mo>|</mo> <mfrac> <mrow> <msub> <mi>V</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>V</mi> <mn>1</mn> </msub> </mrow> <mrow> <msub> <mi>t</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>t</mi> <mn>1</mn> </msub> </mrow> </mfrac> <mo>|</mo> </mrow> <mo>;</mo> </mrow>
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.
CN201710542431.4A 2017-07-05 2017-07-05 Oxygen kerosene engine test liquid oxygen mass flow measurement methods Pending CN107255503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710542431.4A CN107255503A (en) 2017-07-05 2017-07-05 Oxygen kerosene engine test liquid oxygen mass flow measurement methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710542431.4A CN107255503A (en) 2017-07-05 2017-07-05 Oxygen kerosene engine test liquid oxygen mass flow measurement methods

Publications (1)

Publication Number Publication Date
CN107255503A true CN107255503A (en) 2017-10-17

Family

ID=60024928

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710542431.4A Pending CN107255503A (en) 2017-07-05 2017-07-05 Oxygen kerosene engine test liquid oxygen mass flow measurement methods

Country Status (1)

Country Link
CN (1) CN107255503A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110442155A (en) * 2019-07-31 2019-11-12 西安航天动力试验技术研究所 A kind of no-load voltage ratio heating device liquid oxygen flow process for accurately
CN111750470A (en) * 2020-07-30 2020-10-09 中山市斯泰尔电器科技有限公司 Automatic humidification amount adjusting method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823592A (en) * 1988-02-05 1989-04-25 Micro Motion, Inc. Test apparatus for proving the performance of mass flow meters
CN202522295U (en) * 2012-03-20 2012-11-07 西安航天动力试验技术研究所 System for calibrating turbine flow meter under condition of large flow of low-temperature medium
CN203275095U (en) * 2013-04-24 2013-11-06 北京航天试验技术研究所 Attitude and orbit control engine test platform propellant flow comparison and measurement system
CN106568484A (en) * 2016-11-02 2017-04-19 北京控制工程研究所 Self-controlled flow test device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823592A (en) * 1988-02-05 1989-04-25 Micro Motion, Inc. Test apparatus for proving the performance of mass flow meters
CN202522295U (en) * 2012-03-20 2012-11-07 西安航天动力试验技术研究所 System for calibrating turbine flow meter under condition of large flow of low-temperature medium
CN203275095U (en) * 2013-04-24 2013-11-06 北京航天试验技术研究所 Attitude and orbit control engine test platform propellant flow comparison and measurement system
CN106568484A (en) * 2016-11-02 2017-04-19 北京控制工程研究所 Self-controlled flow test device

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
API石油计量标准手册编译组: "《美国石油学会石油计量标准手册》", 31 October 1987, 石油工业出版社 *
于贤福 等: "《油库技术管理》", 31 December 1998, 中国石化出版社 *
康必勇: "《油品计量理论及操作》", 30 June 2004, 兰州大学出版社 *
李建军 等: "液氧平均流量测量研究", 《火箭推进》 *
耿卫国 等: "高精度低温介质稳态质量流量、液位自动测量***", 《低温工程》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110442155A (en) * 2019-07-31 2019-11-12 西安航天动力试验技术研究所 A kind of no-load voltage ratio heating device liquid oxygen flow process for accurately
CN111750470A (en) * 2020-07-30 2020-10-09 中山市斯泰尔电器科技有限公司 Automatic humidification amount adjusting method

Similar Documents

Publication Publication Date Title
US6708573B1 (en) Process for filling compressed gas fuel dispensers which utilizes volume and density calculations
CN107941307B (en) Propellant flow field calibration system and method for conventional large-scale liquid engine
CN108680226B (en) Accurate method for detecting current oil quantity of oil tank
CN105651351B (en) A kind of burette type gas flow surveying instrument and method based on weighing principle
CN203275095U (en) Attitude and orbit control engine test platform propellant flow comparison and measurement system
CN105387339B (en) CNG on-site proving methods
CN107131932A (en) The detection means and detection method of a kind of gas turbine meter
US11982556B2 (en) Wet gas flow rate metering method based on a coriolis mass flowmeter and device thereof
CN103278330A (en) Propellant flow comparison and measurement system for attitude and orbit control engine testing platform
CN103134572A (en) Calibration method of fuel dispenser
CN107255503A (en) Oxygen kerosene engine test liquid oxygen mass flow measurement methods
JPH03500446A (en) Method and device for measuring volume of liquid flow
CN104359521A (en) Large-capacity storage tank volume detection system and calibration method
CN107860434A (en) A kind of fuel tank for automobile calibration system and scaling method
CN105571661B (en) The computational methods of electromagnetic flowmeter instrument characteristic coefficient based on error of indication fitting
CN103542905A (en) Water meter flow identifying method
CN105424080B (en) The method for measuring fuel mass and fuel density
CN205352516U (en) Electron gas table calibrating installation
CN110231074B (en) Method for rapidly detecting error of water meter
CN104568082A (en) Supercritical CO2 flowmeter calibration device and calibration method thereof
CN112197831A (en) Method for measuring irregular large volume by using gas state change method
CN104964729B (en) A kind of calibrating installation of fluid metering instrument
CN104089687A (en) Online calibration device and method for LNG filling machine
KR101639033B1 (en) Temperature and Volume Measuring System of Fuel Tank at Vehicle by using Gas Pump
RU2344379C2 (en) Automated method of calculating and finding product balance of oil products on petroleum storage depots and filling stations

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20171017

RJ01 Rejection of invention patent application after publication