CN202522295U - System for calibrating turbine flow meter under condition of large flow of low-temperature medium - Google Patents

System for calibrating turbine flow meter under condition of large flow of low-temperature medium Download PDF

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Publication number
CN202522295U
CN202522295U CN2012201062529U CN201220106252U CN202522295U CN 202522295 U CN202522295 U CN 202522295U CN 2012201062529 U CN2012201062529 U CN 2012201062529U CN 201220106252 U CN201220106252 U CN 201220106252U CN 202522295 U CN202522295 U CN 202522295U
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China
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low
flow meter
temperature medium
temperature
container
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CN2012201062529U
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来代初
张辉
李正兵
雷震
郭立
赵延
冷海峰
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Xian Aerospace Propulsion Institute
Xian Aerospace Propulsion Testing Technique Institute
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Xian Aerospace Propulsion Testing Technique Institute
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Abstract

A system for calibrating a turbine flow meter under a condition of large flow of a low-temperature medium comprises a low-temperature medium container, a segment-type capacitive liquid level meter, a plurality of temperature sensors and at least one turbine flow meter, wherein the segment-type capacitive liquid level meter is arranged in the low-temperature medium container; the plurality of temperature sensors are arranged in the low-temperature medium container in the axial direction of the low-temperature medium container; the inlet end of the low-temperature medium container is connected with a test filed tapping pipeline via a mounting flange; and the outlet end of the low-temperature medium container is connected with a transmission pipe. The system solves the technical problems of the conventional flow measurement to a conventional low-temperature medium, including too large error and inaccuracy, real medium calibration data of turbine flow meter is obtained via real field medium tapping and by utilizing the segment-type capacitive liquid level meter to execute in situ calibration of a field real medium, and further accurate measurement of the low-temperature medium flow during test is ensured, so as to meet evaluation requirement on performance parameters of an engine.

Description

The system of calibration turbo flow meter under the big flow of cryogenic media
Technical field
The utility model relates to the system of calibration turbo flow meter under the big flow of cryogenic media.
Background technology
The specific impulse of aircraft engine is the ratio of its thrust and the propellant mass that consumes; Be to estimate one of active force engine key parameter; Directly related with the calculating of aircraft useful load, repropellenting amount etc., and motor power and propellant flow rate all are to obtain through the continuous correction of a large amount of ground level heat firing test datas to theoretical model.
The propellant of cryogenic media engine is cryogenic media and fuel, and wherein the temperature of cryogenic media is the subzero Baidu of attending, and for example the propellant of oxygen kerosene engine is liquid oxygen and kerosene, wherein liquid oxygen temperature-183.5 ℃; Because characteristic variations under violent heat exchange and the equipment and materials low temperature will make that like this there is great difficulty in the flow that accurately obtains cryogenic media.Existing in the test of cryogenic media engine, generally all be to adopt the DN300 turbo flow meter to carry out the flow measurement of cryogenic media.But the true medium of still unconditional use carries out verification to this turbo flow meter at present.Therefore, use turbo flow meter laboratory water verification coefficient to carry out data processing, but the laboratory verification exist than big-difference with temperature, the viscosity of used true medium cryogenic media in temperature, viscosity and the process of the test of aqueous medium; In addition, laboratory verification environment, flow sensor installment state and testing ground installment state are distinct, and several factors all can be brought error to flow measurement.And in the true test, the flow of cryogenic media is very high, and for example liquid oxygen cryogenic media flow is up to nearly 600kg/s; Because check system capabilities limits; Aqueous medium verification scope can't satisfy alignment requirements, and check results is brought additional effect, and the flow that causes measuring is not accurate.
Summary of the invention
For the flow measurement error that solves existing cryogenic media too greatly, technical matters accurately not; The utility model provides a kind of system of under the big flow of cryogenic media, calibrating turbo flow meter; Through the true medium tapping in scene; Utilize the segment type capacitance liquid level meter turbo flow meter to be carried out the original position calibration of on-the-spot true medium; Obtain the true medium calibration data of turbo flow meter, and then the accurate measurement of cryogenic media flow in the warranty test process, to satisfy the assessment requirement of engine performance parameter.
The technical solution of the utility model:
The system of calibration turbo flow meter under the big flow of cryogenic media, its special character is: comprise the cryogenic media container, segment type capacitance liquid level meter, a plurality of temperature sensor and at least one turbo flow meter,
Said segment type capacitance liquid level meter is arranged in the cryogenic media container; Said a plurality of temperature sensor is axially disposed within the cryogenic media container along the cryogenic media container; The inlet end of said cryogenic media container is connected with testing ground tapping pipeline through mounting flange; Said cryogenic media outlet of container end is connected with conveyance conduit, and said turbo flow meter is arranged on the conveyance conduit, and the correspondence position that is provided with the conveyance conduit of turbo flow meter is provided with temperature sensor.
Above-mentioned turbine flow is counted three, and three turbo flow meters are successively set on the conveyance conduit.
The advantage that the utility model had:
1, the utility model uses the segment type capacitance liquid level meter that turbo flow meter is carried out field calibration; The factors such as temperature, viscosity, installation environment of having eliminated are to the turbo flow meter Effect on Performance; Obtained under the big flow condition; The true medium verification of turbo flow meter coefficient, and then just can accurately obtain the cryogenic media flow.
2, adopt the utility model calibration system that turbo flow meter is calibrated, average discharge measuring system precision is ± 0.65%, as calibration source, the turbo flow meter measuring accuracy is assessed, and measuring accuracy is superior to 1%.From the test of many times data, process of the test measured value and design load are consistent, for aircraft generally provides engine performance parameter accurately.
Description of drawings
Fig. 1 is the structural representation of the utility model calibration system;
Fig. 2 is the utility model segment type capacitance liquid level meter oscillogram.
Wherein Reference numeral is: 1-mounting flange, 2-cryogenic media container, 3-segment type capacitance liquid level meter, 4-temperature sensor, 5-turbo flow meter.
Embodiment
As shown in Figure 1; The system of calibration turbo flow meter comprises cryogenic media container 2, segment type capacitance liquid level meter 3, a plurality of temperature sensor 4 and at least one turbo flow meter 5 under the big flow of cryogenic media; Segment type capacitance liquid level meter 3 is arranged in the cryogenic media container 2; A plurality of temperature sensors 4 are axially disposed within the cryogenic media container 2 along cryogenic media container 2, and the inlet end of cryogenic media container 2 is connected with testing ground tapping pipeline through mounting flange 1, and cryogenic media outlet of container end is connected with conveyance conduit; Turbo flow meter 5 is arranged on the conveyance conduit, and the correspondence position that is provided with the conveyance conduit of turbo flow meter is provided with temperature sensor.Generally accurate for what measure, turbine flow is counted three, and three turbo flow meters are successively set on the conveyance conduit.
Embodiment:
In order to obtain the accurate liquid oxygen data on flows in the process of the test, testing table has been set up corresponding liquid oxygen flow, original position calibration system.Comprise that liquid oxygen container is carried out axial volume to be demarcated; Carry out volume, temperature, pressure correction; High precision segment type capacitance liquid level meter is installed in liquid oxygen container, the while is the axial and a plurality of cryogenic temperature sensors of turbo flow meter periphery installation at liquid oxygen container, through the true medium tapping in testing ground; Utilize the segment type capacitance liquid level meter turbo flow meter to be carried out the original position calibration of on-the-spot true medium; Obtain the true medium calibration data of turbo flow meter, and then the accurate measurement of liquid oxygen flow in the warranty test process, to satisfy rocket totally to the assessment requirement of engine performance parameter.
Use true medium liquid oxygen to carry out repeatedly tapping; The different operating mode liquid oxygen of tapping flow range covering engine work flow; Utilize the segment type capacitance liquid level meter to obtain volumetric flow rate; Obtain the LIQUID OXYGEN DENSITY of relevant position and time period indirectly through temperature survey,, obtain the verification coefficient of DN300 liquid oxygen turbo flow meter according to the principle of mass conservation.
In the commissioning process, measuring system is obtained the frequency (as shown in Figure 2) of liquid oxygen supply line segment type capacitance liquid level meter output waveform in real time, according to the verification coefficient of respective turbine flowmeter, obtains the liquid oxygen flow of engine working process.
The design of segment type capacitance liquid level meter
Make the segment type capacitance liquid level meter, contain the upper and lower end socket of container, liquid level gauge is formed 8.3 meters of total lengths by inner core, urceolus, insulation course, connection terminal, outer lead etc.Variation along with liquid level in the container; The capacitance that inner core, urceolus constitute electric capacity can through capacitive transducer, convert capacitance variations into the variation of voltage along with variation; And carry out shaping, processing and amplifying, satisfy the requirement of acquisition system letter tuned plate spare input signal amplitude to guarantee the magnitude of voltage size.As shown in Figure 2, flow out the variation of medium volume sometime in the section inner pressurd vessel, can represent through the variation of the triangular wave that measures.
The volumetric calibration of liquid oxygen container and correction
Because engine test district condition restriction; Add cost consideration; Measurement unit generally under normal temperature, condition of normal pressure, uses aqueous medium that used container is carried out volumetric calibration, and this method has also been adopted in the demarcation of test bay liquid oxygen container; When providing the liquid oxygen volume data, the not influence of factor such as account temperature, pressure.After liquid oxygen injected, because the variation of temperature, pressure, deformation can take place in container yet in actual use; Simultaneously, because the segment type capacitance liquid level meter is installed in the container, also can occupy certain volume; Therefore, be mounted with at container under the condition of medium, variant under the vessel volume of sustained height and normal temperature, the atmospheric pressure state; For the interior accurate liquid oxygen volume of section sometime is provided, need under low temperature, pressure-bearing condition, revise to the volume of container, obtain the liquid oxygen volume under the full-scale condition.The vessel volume correction formula is seen (1):
V=V 20[1-(2α 12)(t-20)] (1)
In the formula: the volume under the V-low-temperature condition, m 3
V 2020 ℃ of volumes of depressing often shown in the-capacities chart, m 3
α 1The linear expansion coefficient of-container material;
α 2The linear expansion coefficient of-liquid level meter material;
α 1, α 2Get the mean value of liquid oxygen temperature when demarcating 20 ℃ of temperature and test, ℃;
The t-average temperature of liquid, ℃.
The on-the-spot original position high flow calibration of turbo flow meter
Turbine flow is counted the volume flow measurement sensor.In the engine test process, turbo flow meter is measured mass flow sensor calculation formula and is seen (2):
q mo=ρ(α+bf) (2)
In the formula: q Mo-liquid oxygen flow, kg/s;
ρ-LIQUID OXYGEN DENSITY, kg/m 3
α-verification intercept;
B-verification slope;
In the f-process of the test, turbo flow meter output frequency value, Hz.
The average discharge measuring system is made up of segment type capacitance liquid level meter, capacitive transducer etc., and it also is the volume flow measurement sensor, and its volume flow measurement method is seen formula (3):
q V = V 1 - V 2 t 2 - t 1 - - - ( 3 )
In the formula: V 1-t 1Corresponding liquid oxygen volume of the moment, m 3
V 2-t 2Corresponding liquid oxygen volume of the moment, m 3
Carry out the calibration of on-the-spot original position according to the principle of mass conservation, promptly in section sometime, the liquid oxygen flow that flows out liquid oxygen container equates with the liquid oxygen flow mass of the turbo flow meter of flowing through, and sees formula (4):
q mo=q v·p V (4)
Through measuring in the liquid oxygen container and the liquid oxygen temperature at turbo flow meter place; Obtain the LIQUID OXYGEN DENSITY at liquid oxygen container and turbo flow meter place; Through repeatedly tapping data, turbo flow meter is carried out the true medium calibration of on-the-spot original position, utilize least square method; Obtain turbo flow meter verification coefficient, see formula (5):
ρ momo+b mof)=q v·p V (5)
In the formula: p Mo-turbo flow meter place LIQUID OXYGEN DENSITY;
α Mo-on-the-spot original position is calibrated the intercept that obtains;
b Mo-on-the-spot original position is calibrated the slope that obtains;
p vLIQUID OXYGEN DENSITY in the-container.
Density measure: the indirect method of measurement is basically all adopted in measurement at present for LIQUID OXYGEN DENSITY, promptly through measuring the liquid oxygen temperature, obtains the method for density indirectly.Near-183 ℃, 1 ℃ of the every variation of liquid oxygen temperature brings the variation of density to be about 0.44%, in order to improve the LIQUID OXYGEN DENSITY measuring accuracy, must guarantee the thermometric accuracy of liquid oxygen.Cryogenic temperature sensor measuring accuracy such as copper-constantan thermocouple, RTD are advanced contrast, selected RTD, in the liquid oxygen temperature, its measuring accuracy is ± 0.51 ℃, is higher than type sensors such as copper-constantan thermocouple far away.Study from aspects such as measuring method, methods of calibration, under same condition, thermometric compares with RTD and low temperature standards sensor again, and temperature error has guaranteed the accurate measurement of liquid oxygen temperature less than ± 0.3 ℃.
Use the segment type capacitance liquid level meter that turbo flow meter is carried out field calibration; The factors such as temperature, viscosity, installation environment of having eliminated are to the turbo flow meter Effect on Performance; Obtained under the big flow condition, the true medium verification of turbo flow meter coefficient, and then obtained liquid oxygen flow accurately.
Various factors to influencing average discharge measuring system measuring accuracy is analyzed; Synthesize according to the error blending theory, average discharge measuring system precision is ± 0.65%, as calibration source; The turbo flow meter measuring accuracy is assessed, and measuring accuracy is superior to 1%.From 1200kN liquid oxygen/kerosene engine two-shipper test figure repeatedly, process of the test measured value and design load are consistent, for rocket generally provides engine performance parameter accurately.

Claims (2)

1. under the big flow of cryogenic media, calibrate the system of turbo flow meter, it is characterized in that: comprise the cryogenic media container, segment type capacitance liquid level meter, a plurality of temperature sensor and at least one turbo flow meter,
Said segment type capacitance liquid level meter is arranged in the cryogenic media container; Said a plurality of temperature sensor is axially disposed within the cryogenic media container along the cryogenic media container; The inlet end of said cryogenic media container is connected with testing ground tapping pipeline through mounting flange; Said cryogenic media outlet of container end is connected with conveyance conduit, and said turbo flow meter is arranged on the conveyance conduit, and the correspondence position that is provided with the conveyance conduit of turbo flow meter is provided with temperature sensor.
2. system of under the big flow of cryogenic media, calibrating turbo flow meter according to claim 1, it is characterized in that: said turbine flow is counted three, and three turbo flow meters are successively set on the conveyance conduit.
CN2012201062529U 2012-03-20 2012-03-20 System for calibrating turbine flow meter under condition of large flow of low-temperature medium Expired - Lifetime CN202522295U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105067089A (en) * 2015-08-26 2015-11-18 中核检修有限公司 Calibration device for turbine flow transmitter
CN105865587A (en) * 2016-05-17 2016-08-17 中国人民解放军63820部队吸气式高超声速技术研究中心 Calibration method of engine flowmeter
CN107255503A (en) * 2017-07-05 2017-10-17 西安航天动力试验技术研究所 Oxygen kerosene engine test liquid oxygen mass flow measurement methods
CN107941307A (en) * 2017-11-10 2018-04-20 西安航天动力试验技术研究所 A kind of large-scale liquid engine propellant flow rate field calibration system and method for routine
CN109781193A (en) * 2018-12-09 2019-05-21 西安航天动力试验技术研究所 Turbine flowmeter calibrated in situ method applied to testing ground
CN112563105A (en) * 2019-09-10 2021-03-26 中微半导体设备(上海)股份有限公司 System and method for realizing gas flow verification in plasma processing device
CN114458477A (en) * 2020-12-14 2022-05-10 北京天兵科技有限公司 Low-fluctuation liquid level low-temperature online in-situ flow calibration method and system

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105067089A (en) * 2015-08-26 2015-11-18 中核检修有限公司 Calibration device for turbine flow transmitter
CN105067089B (en) * 2015-08-26 2018-05-22 中核检修有限公司 The calibration equipment of turbine flux transmitter
CN105865587A (en) * 2016-05-17 2016-08-17 中国人民解放军63820部队吸气式高超声速技术研究中心 Calibration method of engine flowmeter
CN105865587B (en) * 2016-05-17 2017-03-15 中国人民解放军63820部队吸气式高超声速技术研究中心 A kind of scaling method of electromotor effusion meter
CN107255503A (en) * 2017-07-05 2017-10-17 西安航天动力试验技术研究所 Oxygen kerosene engine test liquid oxygen mass flow measurement methods
CN107941307A (en) * 2017-11-10 2018-04-20 西安航天动力试验技术研究所 A kind of large-scale liquid engine propellant flow rate field calibration system and method for routine
CN109781193A (en) * 2018-12-09 2019-05-21 西安航天动力试验技术研究所 Turbine flowmeter calibrated in situ method applied to testing ground
CN112563105A (en) * 2019-09-10 2021-03-26 中微半导体设备(上海)股份有限公司 System and method for realizing gas flow verification in plasma processing device
CN112563105B (en) * 2019-09-10 2023-11-03 中微半导体设备(上海)股份有限公司 System and method for implementing gas flow verification in plasma processing apparatus
CN114458477A (en) * 2020-12-14 2022-05-10 北京天兵科技有限公司 Low-fluctuation liquid level low-temperature online in-situ flow calibration method and system
CN114458477B (en) * 2020-12-14 2023-08-22 北京天兵科技有限公司 Low-fluctuation liquid level and low-temperature on-line in-situ flow calibration method and system

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Granted publication date: 20121107