CN109374693A - Cryogen void fraction measuring device and method in a kind of pipe - Google Patents
Cryogen void fraction measuring device and method in a kind of pipe Download PDFInfo
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- CN109374693A CN109374693A CN201811197916.5A CN201811197916A CN109374693A CN 109374693 A CN109374693 A CN 109374693A CN 201811197916 A CN201811197916 A CN 201811197916A CN 109374693 A CN109374693 A CN 109374693A
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Abstract
The invention discloses cryogen void fraction measuring device and methods in a kind of pipe.Device includes: measurement zone shell, capacitor collecting circuit board, adapting pipe, conductive draw pin, teflon insulation set, electrode slice, sealing copper band.The device utilizes the characteristic of polytetrafluoroethylene (PTFE) contraction under low temperature, shrinks locking connecting pipe at low temperature, strengthens sealing, while not only having regard measurement zone shell as the skeleton of measuring section for the close feature of cryogen liquid gas dielectric constant but also being grounded and having used as shielding case.This cryogen capacitance chromatography imaging device has the following characteristics that structure is simple, and fast demountable can facilitate and connect with system other pipelines；It can be used for the larger range from room temperature to profound hypothermia, repeatedly significantly temperature cycles do not influence measurement accuracy；Anti- stray capacitance ability is good, effectiveness is good.Measurement method disclosed in this patent is associated with void fraction by measurement capacitance in the way of support vector regression, and obtained fitting result precision is higher.
Description
Technical field
The present invention relates to cryogenic refrigeration engineering technology, process fluid flow monitoring and sensor science and technology field, especially
It is related to cryogen void fraction measuring device and method in a kind of pipe.
Background technique
Two-phase flow often occurs in the fluids such as chemical industry, space division related industries in managing, and is related to design optimization and operational safety,
Therefore significant to the detection of two-phase distribution.
It is larger different from room temperature fluid gas-liquid dielectric constant difference, cryogen such as liquid oxygen, liquid nitrogen liquid-gas dielectric constant ratio
Generally less than 1.5, imaging results are extremely sensitive for measurement noise, in order to guarantee to have preferable imaging effect, need to construct good
Good electromagnetic armouring structure.In addition, as embrittlement easily occurs under organic glass and quartz glass nonmetal pipeline low temperature.The present invention
It is directed to the phase content measuring technique needs of cryogen, physical property of comprehensive cryogen itself and the material spy under low temperature environment
Property, carry out invention design.The generation for avoiding low-temperature embrittleness as tube body using polytetrafluoroethylene (PTFE), using outer layer shell both conduct
The support frame of polytetrafluoroethylene (PTFE) is also grounded uses as the shielding case of electrode slice simultaneously.Signal is drawn using conductive draw pin,
The Hard link between electrode slice and capacitor collecting circuit board is realized, the fluctuation of stray capacitance can be greatly weakened.Polytetrafluoroethyl-ne
There is stretching forward position at alkene insulation sleeve both ends, are inserted into the stretching forward position slot of connecting pipe, when device is under low temperature environment, poly- four
Vinyl fluoride is shunk, can radial locking to increase sealing reliability.
A kind of low temperature condenser type void fraction measuring device (201610332690.X) of Chinese patent discloses a kind of using double
Capacitor measured value device associated with interior cryogen is managed, the device are used bipolar electrode chip architecture by electrode slice capacitance sensor,
And be the one-to-one correspondence of simple capacitance and void fraction on correlating method, the susceptibility of convection variation is larger, complexity stream
It is being difficult to have obtained under type as a result, the patent all have with this patent on apparatus structure and in the association mechanism of measurement data it is very big
Difference.
Flowing capacitance chromatography imaging device (201711264162.6) discloses one in a kind of cryogen pipe of Chinese patent
Kind is applied to the capacitance chromatography imaging device of cryogen two phase flow and shields using being flexible coupling between electrode slice and test circuit
A part that cover is not used as tube body is covered, while using the inversion algorithm of capacitance chromatography imaging as solution mode, in device knot
There is bigger difference with the application on structure and Processing Algorithm.
Document " Capacitance-based liquid holdup measurement of cryogenic two-
phase flow in a nearly-horizontal tube"(Cryogenics 2017；84:69-75), " it is based on capacitance method
Pipe in cryogen thickness of liquid film measurement method " (journal of Zhejiang university: engineering version, 2016,50 (10): 1855-1858) etc.
It is mutually distributed to the two pole piece capacitance sensors for being applied to the measurement of cryogen two phase flow void fraction and suitable for cryogen in succession
And the electrical capacitance tomography of void fraction measurement has carried out theoretical and experiment research.Experiment shows secondly pole piece in document
Capacitance sensor can be controlled within 15% the measurement error of cryogen void fraction in pipe, but package outside this sensor
Two electrode slices, also do not take electromagnetic armouring structure, huge with structure of the invention difference.Document
《Preliminaryevaluation of cryogenic two-phase flow imaging using electrical
Capacitance tomography " (Cryogenics, 2017,86) to be applied to cryogen measurement capacitance chromatography imaging
Technology has carried out theoretical validation, it is found that the result of its numerical experiment is preferable, but article is without reference to being directed to cryogen two-phase
The concrete structure design of the capacitance tomography sensor of flow measurement, while its derivation algorithm also has very big difference with this patent.
Document " How to measure void fraction of two-phase cryogenic flows " (Cryogenics,
2000,40(4):279-285)、《Metrological systems for monitoring two-phase cryogenic
flows》(Cryogenics,2000,40(4):279-285)、《New solutions to produce a cryogenic
void fraction sensor of round cross-section and its applications》(Cryogenics
2013；It 57:55-62) has studied and measures cryogen two phase flow void fraction using radio frequency sensor, the results showed that in small diameter tube
In the case of radio frequency sensor measurement accuracy up to 1.5%, it and the present invention use entirely different principle and structure.
In conclusion according to the physical property feature of material each under low temperature environment and the spy of cryogen liquid phase dielectric constant
Point, design it is a kind of be necessary specifically in the capacitance chromatography imaging device flowed in cryogen pipe, which possesses
The characteristics of non-intrusion measurement, can monitor the void fraction flowed in cryogen pipe in real time.
Summary of the invention
The present invention provides cryogen cavity measuring device and method in a kind of pipe, which can be by measuring electrode two-by-two
Capacitor between piece, transfers data on computer, is arranged in capacitance data by way of support vector regression symmetrical
The characteristic value of matrix is associated with the void fraction for managing interior cryogen, which has the characteristics that non-intrusion type, and structure is simple,
Fast demountable can facilitate and connect with system other pipelines；It can be used for the larger range from room temperature to profound hypothermia, repeatedly significantly
Temperature cycles do not influence measurement accuracy, and anti-stray capacitance ability is good, electromagnetic shielding capability is strong.
Technical scheme is as follows:
Cryogen cavity measuring device and method is set in a kind of pipe of the present invention, which includes such as lower component: measurement zone
Shell, capacitor collecting circuit board, adapting pipe, conductive draw pin, teflon insulation set, electrode slice, sealing copper band.
Measurement zone shell is the cylindrical shape that both ends are got through, and both ends pass through flange respectively and respectively connect an adapting pipe, the two
The sealing of junction carries out copper band sealing in the close circle sealing groove using sealing copper band filling flange；Teflon insulation set is two
The cylindrical shape got through is held, is covered in the inside of measurement zone shell, outer diameter is equal to the internal diameter of measurement zone shell；Electrode slice is circumferential uniformly
The inner surface of teflon insulation set is close in distribution；Conductive draw pin one end is welded on electrode slice, and the other end is welded on capacitor
On collecting circuit board.
Further, the quantity of the electrode slice (6) is more than or equal to 8, and shape is curved thin slice in rectangle, bending half
Diameter is consistent with teflon insulation set (5) internal diameter；Teflon insulation set inside is provided with circumferential groove, the depth of circumferential groove with
The width of the consistency of thickness of electrode slice (6), circumferential groove is consistent with the length of electrode slice (6), and electrode slice (6) is embedded in circumferential groove,
Two step surfaces of axial ends face abutting circumferential groove.
Further, two conductive draw pins (4) are welded on every plate electrode piece (6), adjacent two panels electrode slice (6) is each
There is a conductive draw pin (4) to be welded on same capacitor collecting circuit board (2), conductive draw pin (4) extends radially, and gathers
Tetrafluoroethene insulation sleeve (5) and measurement zone shell (1) are provided with conductive draw pin export on the position that conductive draw pin (4) are stretched out respectively
Through-hole b and conductive draw pin export through-hole a, and the aperture of conductive draw pin export through-hole a is larger than the hole of conductive draw pin export through-hole b
The aperture of diameter, conductive draw pin export through-hole b is equal to the column diameter of conductive draw pin (4), exports after the assembly is completed to conductive draw pin
The gap of hole a and conduction draw pin leadout hole b and conductive draw pin (4) carries out glue envelope, and conductive draw pin (4) cannot touch measurement zone pipe
Shell (1).
Further, the structure of the teflon insulation set (5) is integrally integrally machined, and material is poly- four
Vinyl fluoride, the stretching forward position for thering is on two end face ring to fill, a side end face of adapting pipe (3) and measurement zone shell (1) cooperation
On be provided with and stretch out forward position slot, when assembly before the stretching of stretching forward position insertion adapting pipe (3) of teflon insulation set (5)
Along slot.
Further, the measurement zone shell (1) is conductive metal material, and measurement zone shell (1) connects when device is run
Ground.
Further, the static state for carrying out capacitance data to the typical condition of known void fraction by the way of static demarcating is adopted
Collection, is arranged as a symmetrical matrix for the capacitance data of acquisition and is normalized, and is extracted using the thought of principal component analysis
The characteristic value of matrix is arranged as feature value vector, and each operating condition is corresponding with a feature value vector, then using support to
It measures the method returned this feature value vector is associated with void fraction, obtains fitting formula；Then carrying out to low temperature in test tube
When fluid void fraction measures, the feature value vector of the capacitance data in the case of void fraction to be measured is obtained, inputs fitting formula
Obtain void fraction；
The specific steps of which are as follows:
1) the piece number of electrode slice (6) measures under the typical condition of known void fraction for N plate electrode piece and obtains electrode two-by-two
Capacitor between piece, since capacitor is equal between capacitor and electrode slice b, a between electrode slice a, b, it is only necessary to measuring electrode sheet 1-2,1-
3 ..., 1-N, 2-3 ..., between 2-N ..., (N-1)-N altogetherA capacitance；
2) all capacitance C are arranged as becoming a symmetrical matrix,
Wherein subscript indicates two panels pole piece, i.e. CabThe capacitor between electrode slice a, b is indicated, wherein the element etc. on main diagonal element
In the sum of same a line other elements；
3) by capacitance matrix normalization, normalization matrix ξ is obtained,
Wherein Cmin、CmaxRespectively when filling up low-k phase (generally gas phase) and high dielectric constant phase (one in pipe
As be liquid phase) when capacitance matrix, seek the characteristic value of the normalization matrix, obtain feature value vector (λ1,λ2,…,λN)T；
4) using feature value vector as input, void fraction is as output, by the feature value vector of the typical operating point taken
It is trained in void fraction merging support vector regression, obtains fitting function
Wherein l is the number for trained typical operating point, and y is void fraction, X be using when the feature of capacitor that measures
It is worth vector, XiIndicate that the feature value vector of i-th of typical operating point, K are kernel function, αi, β be training parameter, it is possible thereby to pass through
The capacitor of some void fraction situation to be measured is measured, symmetrical matrix is arranged in and obtains its characteristic value after being normalized
Vector inputs above-mentioned fitting formula and obtains the result of void fraction.
Further, when taking typical condition, need to cover annular flow, bubble flow, stratified flow and droplet in flow pattern selection
Stream；Typical condition needed in the covering of void fraction from void fraction be 0 at regular intervals value get 1 always.
For the present invention compared with prior art and for its own design feature, advantage is mainly reflected in five aspects:
First, the extraction of capacitance data is transmitted a signal on capacitance measurement circuit plate by conductive draw pin in the present invention, this side
Formula is advantageous in that Hard link, so-called Hard link are the hardwired benefits for the mode that is flexible coupling that conducting wire is drawn
It is to largely avoid the drift of stray capacitance, when device is run in the application, the capacitance measured is 10-2The magnitude of pF,
It is very sensitive to stray capacitance, hardwired processing mode solve be flexible coupling it is middle due to conducting wire is swung caused by stray capacitance
Drifting problem；Second, since electrode slice needs directly to contact with fluid, especially under low-temperature condition, necessarily refer to leakage
Sealing problem, place especially optimizes for sealing problem at two in this application: one is teflon insulation set
Overall processing shapes and has stretching forward position, and at low temperature, polytetrafluoroethylene (PTFE) has bigger than general tube material such as stainless steel
Shrinking percentage, it is thus possible to utilize be inserted in adapting pipe stretching forward position locking adapting pipe performance forward position socket portion shape
At sealing.The second is using the conductive draw pin export through-hole a of measurement zone bulb portion and leading for teflon insulation set part
Extraction channel of the electric draw pin export through-hole b as conductive draw pin, first reduces sealing surface, in conductive draw pin and export well
The gap location glue envelope of through-hole can be sealed, and second the upper conductive draw pin of teflon insulation set exports the aperture through-hole b
Identical as conductive draw pin column diameter, polytetrafluoroethylene (PTFE) is shunk under low temperature, can strengthen sealing effect；Third, by electromagnetism in the application
Shielding case is combined into one with measurement zone shell, i.e., measurement zone shell has both the function of pipeline pipe shaft and electro-magnetic shielding cover simultaneously, is made
It is the connection between metallic conduit that the rigidly connected position of section, which must be measured, enhances the structural strength of device, simplifies device
Assemble flow ensure that the good shield effectiveness to outside electromagnetic interference simultaneously；4th, the fitting side used in the application
Formula is the fit approach based on Least square support vector regression, and the flow behavior of tube fluid is combined to disclose one kind
It is directed to the method for typical condition selection, the advantage is that, relative to traditional least square regression algorithm, has and preferably inserts
It is worth precision, in conjunction with the disclosed typical condition choosing method for training, is more applicable for tube fluid and measures this typical case
Operating condition can be between void fraction is 0 to 1 all over the case where taking.
Detailed description of the invention
Fig. 1 is the main view of device in cryogen cavity measuring device and method in a kind of pipe of the present invention.
Fig. 2 is the Section A-A sectional view of device in cryogen cavity measuring device and method in a kind of pipe of the present invention.
Fig. 3 is the section B-B sectional view of device in cryogen cavity measuring device and method in a kind of pipe of the present invention.
Fig. 4 be in a kind of pipe of the present invention in cryogen cavity measuring device and method the measurement zone shell of device it is isometric
Mapping.
Fig. 5 is device, teflon insulation in cryogen cavity measuring device and method in a kind of pipe of the present invention
The installation diagram of set and electrode slice.
Fig. 6 is device, teflon insulation in cryogen cavity measuring device and method in a kind of pipe of the present invention
The cross-sectional view of set and electrode slice installation diagram.
Fig. 7 is the adapting pipe isometric of device in cryogen cavity measuring device and method in a kind of pipe of the present invention
Figure.
Fig. 8 is the normal axomometric drawing of device in cryogen cavity measuring device and method in a kind of pipe of the present invention.
Fig. 9 is in a kind of pipe of the present invention in cryogen cavity measuring device and method, and one kind being directed to intraluminal fluid oxygen
The application example measurement result and true value comparison diagram of laminar flow.
Figure 10 Fig. 9 is in a kind of pipe of the present invention in cryogen cavity measuring device and method, and one kind being directed to intraluminal fluid
The application example measurement result and true value comparison diagram of oxygen ring dress stream.
Figure 11 Fig. 9 is in a kind of pipe of the present invention in cryogen cavity measuring device and method, and one kind being directed to intraluminal fluid
The application example measurement result and true value comparison diagram of oxygen bubble flow.
Figure 12 Fig. 9 is in a kind of pipe of the present invention in cryogen cavity measuring device and method, and one kind being directed to intraluminal fluid
The application example measurement result and true value comparison diagram of oxygen droplet stream.
In figure: 1, measurement zone shell, 2, capacitor collecting circuit board, 3, adapting pipe, 4, conductive draw pin, 5, polytetrafluoroethylene (PTFE)
Insulation sleeve, 6, electrode slice, 7, sealing copper band.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
In one embodiment of the invention, the structure arranged using eight plate electrode pieces, working medium is liquid oxygen-oxygen
Gas, in the way of numerical experiment, to annular flow, stratified flow, bubble flow, droplet stream and some mixing flow patterns from void fraction be 0
Take 132 typical conditions as training points to 1, capacitance is obtained by way of numerical experiment, often obtains one group of capacitance
It is arranged into as symmetrical matrix,
It is normalized,
Wherein Cmin、CmaxCapacitance matrix respectively when filling up oxygen and liquid oxygen in pipe asks the spy of the normalization matrix
Value indicative is combined into feature value vector, X=(λ1,λ2,…,λ8)T, using feature value vector as input, void fraction is used as output,
It is placed in support vector regression, support vector regression uses least square method supporting vector machine in this example, solves fitting
Parameter alphai, b formula be,
Wherein Ωij=K (Xi,Xj), Xi,XjIt is i-th respectively, the input of j typical condition, Y=(y1,y2,…,yl)TIt is
The vector of the output composition of all typical conditions, l is the number of typical condition, in this example l=132.
In this example, the selection mode of mixed kernel function is used for kernel function K,
Wherein (0,1) ρ ∈, σ > 0.
A series of and typical condition void fraction is taken in four kinds of stratified flow, annular flow, bubble flow, droplet stream flow patterns respectively not
Same test point is tested, and obtained result as shown in figs. 9 to 12, is shown in figure with the variation being mutually distributed under different flow patterns
It is intended to, what arrow indicated is the direction of liquid and the variation of gas interface, and square point represents the exact value of test point void fraction,
Soft dot represents the void fraction value being calculated using the application algorithm.It can be found that being obtained using the present processes
Void fraction measured value and true value have very good followability, error is smaller, meets the requirement of industrial application.
Above-described specific embodiment, to the structure of apparatus of the present invention, technical solution and operation in actual use
Mode has been further described, and what is understood should be, sub above is only a specific embodiment of the present invention, and does not have to
In the limitation present invention, but within the spirit and principles in the present invention, any modification made, equivalent replacement, improvement etc. should
It is included within protection scope of the present invention.
Claims (7)
1. cryogen void fraction measuring device in a kind of pipe, it is characterised in that including measurement zone shell (1), capacitor Acquisition Circuit
Plate (2), adapting pipe (3), conductive draw pin (4), teflon insulation set (5), electrode slice (6) and sealing copper band (7)；
Measurement zone shell (1) is the cylindrical shape that both ends are got through, and both ends pass through flange respectively and respectively connect an adapting pipe (3), is surveyed
It measures in close circle sealing groove of the sealing of area's shell (1) and adapting pipe (3) junction using sealing copper band (7) filling flange and carries out copper
Circle sealing；Teflon insulation set (5) is the cylindrical shape that both ends are got through, and covers the inside in measurement zone shell (1), outer diameter etc.
Internal diameter in measurement zone shell (1)；Electrode slice (6) circumferential direction is uniformly distributed, and is close to the inner surface of teflon insulation set (5)；
Conductive draw pin (4) one end is welded on electrode slice, and the other end is welded on capacitor collecting circuit board (2).
2. cryogen void fraction measuring device in a kind of pipe as described in claim 1, which is characterized in that the electrode slice
(6) quantity is more than or equal to 8, and shape is curved thin slice in rectangle, bending radius and teflon insulation set (5) internal diameter one
It causes；Teflon insulation set inside is provided with circumferential groove, the depth of circumferential groove and the consistency of thickness of electrode slice (6), circumferential groove
Width is consistent with the length of electrode slice (6), and for electrode slice (6) in circumferential groove, two platforms of circumferential groove are close in axial ends face
Terrace.
3. cryogen void fraction measuring device in a kind of pipe as claimed in claim 1 or 2, which is characterized in that described is every
Two conductive draw pins (4) are welded on plate electrode piece (6), adjacent two panels electrode slice (6) respectively has a conductive draw pin (4) to be welded on together
On one piece of capacitor collecting circuit board (2), conductive draw pin (4) is extended radially, teflon insulation set (5) and measurement zone
Shell (1) is provided with conductive draw pin export through-hole b on the position that conductive draw pin (4) are stretched out respectively and conductive draw pin exports through-hole a,
The aperture of conductive draw pin export through-hole b is equal to the column diameter of conductive draw pin (4), after the assembly is completed to conductive draw pin leadout hole a
Glue envelope is carried out with the gap of conductive draw pin leadout hole b and conductive draw pin (4), conductive draw pin (4) cannot touch measurement zone shell
(1)。
4. cryogen void fraction measuring device in a kind of pipe as described in claim 1, which is characterized in that the polytetrafluoro
The structure of ethylene insulation sleeve (5) is integrally integrally machined, and material is polytetrafluoroethylene (PTFE), there is stretching for ring dress on two end face
It is provided on one side end face of forward position out, adapting pipe (3) and measurement zone shell (1) cooperation and stretches out forward position slot, poly- four when assembly
In the stretching forward position slot of stretching forward position insertion adapting pipe (3) of vinyl fluoride insulation sleeve (5).
5. cryogen void fraction measuring device in a kind of pipe as described in claim 1, it is characterised in that the measurement zone
Shell (1) is conductive metal material, and measurement zone shell (1) is grounded when device is run.
6. cryogen void fraction measurement method in a kind of pipe of device as described in claim 1, it is characterised in that:
It carries out the static of capacitance data to the typical condition of known void fraction by the way of static demarcating to acquire, by the electricity of acquisition
Holding data arrangement becomes a symmetrical matrix and is normalized, and is arranged using the characteristic value that the thought of principal component analysis extracts matrix
Column become feature value vector, and each operating condition is corresponding with a feature value vector, then will using the method for support vector regression
This feature value vector is associated with void fraction, obtains fitting formula；Then measure to cryogen void fraction in test tube
When, the feature value vector of the capacitance data in the case of void fraction to be measured is obtained, void fraction can be obtained in input fitting formula；
The specific steps of which are as follows:
1) the piece number of electrode slice (6) be N piece, electrode slice measures under the typical condition of known void fraction obtain electrode slice two-by-two between
Capacitor, since capacitor is equal between capacitor and electrode slice b, a between electrode slice a, b, it is only necessary to measuring electrode sheet 1-2,1-3 ..., 1-
N, 2-3 ..., between 2-N ..., (N-1)-N altogetherA capacitance；
2) all capacitance C are arranged as becoming a symmetrical matrix,
Wherein subscript indicates two panels pole piece, i.e. CabThe capacitor between electrode slice a, b is indicated, wherein the element on main diagonal element is equal to together
The sum of a line other elements；
3) by capacitance matrix normalization, normalization matrix ξ is obtained,
Wherein Cmin、CmaxCapacitance matrix respectively when filling up low-k phase and high dielectric constant phase in pipe, asks this to return
One changes the characteristic value of matrix, obtains feature value vector (λ1,λ2,…,λN)T；
4) using feature value vector as input, void fraction is as output, by the feature value vector and sky of the typical operating point taken
It is trained in bubble rate merging support vector regression, obtains fitting function
Wherein l is the number for trained typical operating point, and y is void fraction, X be using when the characteristic value of capacitor that measures to
Amount, XiIndicate that the feature value vector of i-th of typical operating point, K are kernel function, αi, β be training parameter, it is possible thereby to by certain
The capacitor of a void fraction situation to be measured measures, and is arranged in symmetrical matrix and obtains its feature value vector after being normalized
It inputs above-mentioned fitting formula and obtains the result of void fraction.
7. cryogen cavity measuring method in a kind of pipe as claimed in claim 6, which is characterized in that taking typical condition
When, flow pattern selects to need to cover annular flow, bubble flow, stratified flow and droplet stream；Typical condition needs in the covering of void fraction
Will from void fraction be 0 at regular intervals value get 1 always.
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| CN201811197916.5A CN109374693B (en) | 2018-10-15 | 2018-10-15 | Device and method for measuring cavitation rate of cryogenic fluid in pipe |
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| CN201811197916.5A CN109374693B (en) | 2018-10-15 | 2018-10-15 | Device and method for measuring cavitation rate of cryogenic fluid in pipe |
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| CN109738493A (en) * | 2019-03-06 | 2019-05-10 | 深圳市联恒星科技有限公司 | A kind of production method of capacitance tomography system and its capacitance sensor |
| CN109738493B (en) * | 2019-03-06 | 2024-04-30 | 深圳市联恒星科技有限公司 | Capacitance tomography system and manufacturing method of capacitance sensor thereof |
| CN110186962A (en) * | 2019-05-10 | 2019-08-30 | 天津大学 | A kind of imperfect measurement data imaging method for capacitance chromatography imaging |
| CN110470704A (en) * | 2019-08-27 | 2019-11-19 | 浙江大学 | A kind of capacitance tomography sensor applied to cryogen two phase flow phase distribution measuring |
| CN110470704B (en) * | 2019-08-27 | 2020-09-29 | 浙江大学 | Capacitance tomography sensor applied to low-temperature fluid two-phase flow phase distribution measurement |
| CN113340951A (en) * | 2021-06-02 | 2021-09-03 | 中国航发沈阳发动机研究所 | Method and device for measuring oil-gas two-phase flow void ratio of oil return pipeline of aero-engine |
| CN113340951B (en) * | 2021-06-02 | 2023-08-22 | 中国航发沈阳发动机研究所 | Method and device for measuring void ratio of oil-gas two-phase flow of oil return pipeline of aeroengine |
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