CN106247917A - Horizontal flow pattern of gas-liquid two-phase flow quantitatively judges method and device - Google Patents
Horizontal flow pattern of gas-liquid two-phase flow quantitatively judges method and device Download PDFInfo
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Abstract
The invention discloses a kind of horizontal flow pattern of gas-liquid two-phase flow and quantitatively judge method and device, wherein, method comprises the following steps: obtain two phase flow thickness of liquid film data under multiple flow pattern；According to multi-scale entropy concept, two phase flow thickness of liquid film data under multiple flow pattern are carried out signal processing analysis, to extract the feature of different flow pattern；Feature according to the different flow patterns extracted obtains multi-scale entropy arranged distribution characteristic curve, and calculates the multi-scale entropy rate of multi-scale entropy arranged distribution figure difference flow pattern curve；Set up flow pattern data base according to two phase flow thickness of liquid film data, multi-scale entropy arranged distribution characteristic curve, multi-scale entropy rate under multiple flow pattern, to obtain the quantitative judgement form of Flow Regime Ecognition, thus realize the purpose of judgement by the form that quantitatively judges of Flow Regime Ecognition.The method can use multi-scale entropy algorithm process two phase flow thickness of liquid film signal, extracts characteristic quantity and reaches the purpose of Flow Regime Ecognition, improves the suitability and the reliability of judgement, improve the accuracy of judgement.
Description
Technical field
The present invention relates to multiphase flow measurement technology and Flow Regime Ecognition technical field, particularly to a kind of horizontal gas-liquid two-phase
Stream flow pattern quantitatively judges method and device.
Background technology
Flow pattern is the basis of research two phase flow, either academic research or engineer applied, and distinguishing two phase flow pattern is
The most most crucial problem.The flow pattern i.e. distribution situation of two-phase flow medium, the interface distributions of two phase flow presents different geometry
Shape or fluidal texture, divide six kinds according to Oshinowo flow pattern division principle the flow pattern in horizontal pipe, i.e. bubble flow, plug
Shape stream, stratified flow, wave flow, slug flow, annular flow.Up to now, two phase flow pattern switch dynamics mechanism the most not yet ten
Distinguish one from the other.
Flow pattern in early days judges to use flow pattern, and commercial Application generally requires the real-time letter obtaining actual flow state
Breath, therefore the ONLINE RECOGNITION of flow pattern becomes the focus of research.The ONLINE RECOGNITION of flow pattern can be divided into two classes, a class to be directly observation
Method, as Chinese patent CN1595132A proposes a kind of two phase flow grid and capacitor chromatography imaging method.Use insertion type twine electricity
Hold sensor and two phase flow fluid is carried out high-speed rotating scanning, obtain in two-phase fluid all directions in line cross-section
Projection information, obtains the real time imaging of two-phase fluid flowing.The process employs the capacitance probe measurement technology of advanced person, there is reality
Shi Xing, but implement relatively difficult, twine capacitance probe is easily damaged under high speed rotary motion.Another kind of is indirectly to measure
Method, choosing the physical parameter of reactive flow flow pattern features to be the void fraction of object of study, such as biphase gas and liquid flow, pressure
Difference, resistance, electric capacity, electrical conductivity etc., use modern signal processing technology, and the characteristic quantity extracted under different flow pattern identifies flow pattern.
In this regard, substantial amounts of researcher is made that contribution.
For complicated two phase flow Kind of Nonlinear Dynamical System, it is difficult to accurately describe meteor trail echoes problem with mathematical model.
Numerous scholars introduce present information processing method and levy two phase flow pattern by nonlinear characteristic scale.Chinese patent CN1563940
Propose a kind of horizontal tube Method for Discriminating Gas-liquid Two Phase Flow based on Hilbert-Huang transform, to two phase flow differential pressure signal
Carry out Mathematical treatment, there is quantitative characteristic.But the method has following weak point, and one is only to be mentioned to identify bubble flow, bullet
Shape stream, mixed three kinds of flow patterns of shape stream, lack wave flow, stratified flow, the criterion of annular flow equal flow type identification, to horizontal pipe gas-liquid two
The category identification of flow pattern is the most comprehensive mutually.Two is the pressure difference signal that signal is two phase flow processed, and pressure difference signal is not
First preferred signal of direct reaction two phase flow pattern.
1991, (the Pincus S M.Approximate entropy as a measure of system such as Pincus
complexity.[J].Proceedings of the National Academy of Sciences of the United
States of America, 1991,88 (6): 2297-301.) the approximate entropy algorithm in terms of clinical medicine proposed comes place and is in the wrong
The time series signal of many noises.But approximate entropy has two shortcomings, one is the time signal length depending critically upon collection；
Two are a lack of relevant coherency.Based on this, (Richman J S, the Moorman J R.Physiological such as Richman
time-series analysis using approximate entropy and sample entropy.[J]
.American Journal of Physiology Heart&Circulatory Physiology,2000,278(6):
H2039-H2049.) innovatory algorithm Sample Entropy is proposed.Costa(Costa M.Multiscale entropy analysis
of complex physiologic time series.[J].Physical Review Letters,2002,89(6):
705-708.]) think that the physiological dynamics of human health status has the multiple dimensioned property of inherence, and traditional algorithm does not accounts for
This point, multi-scale entropy algorithm it is proposed that.The proposition the earliest of multi-scale entropy algorithm is for physiological medical science signal processing, but
In other field, as a kind of means of signal processing, for Nonlinear Time Series signal, multi-scale entropy algorithm shows
Superiority.University Of Tianjin's Zheng Gui ripple, gold Ningde (two phase flow pattern multi-scale entropy and dynamical property analysis [J]. Acta Physica Sinica,
2009,58 (7): 4485-4492.) use multi-scale entropy algorithm, two phase flow conductance stability bandwidth signal is processed, research knot
Fruit shows that the rate of change feature of different scale Sample Entropy can differentiate three kinds of typical flow patterns such as bubble flow, slug flow, mixed shape stream,
And propose multi-scale entropy rate (Rate of MSE) this concept.
Chinese patent CN103487234A proposes a kind of gas-liquid two-phase flow pattern kinetics table based on multiple dimensioned arrangement entropy
Levy and recognition methods.The method has holding property mutually with the analysis method in University Of Tianjin Zheng Gui ripple, gold Ningde etc..And to collecting
The conductance fluctuation signal of three kinds of gas-liquid two-phase difference flow patterns, is carried out at a series of mathematical method according to the concept of multi-scale entropy
Reason, draws multiple dimensioned arrangement entropy scattergram.The last multiple dimensioned arrangement entropy scattergram according to different flow patterns, calculates multiple dimensioned arrangement
Entropy rate.The analysis of the multiple dimensioned arrangement entropy rate distribution according to flow pattern realizes identification and the classification of flow pattern.But this patent is the most insighted
Other bubble flow, slug flow, mixed three kinds of flow patterns of shape stream, lack the quantitative judgement of other flow patterns.
Two phase flow pattern is the distribution at interface of the gas-liquid two-phase medium, void fraction energy direct reaction flow pattern, therefore selects
Take void fraction or void fraction is that object research flow pattern is the most representative, be primary selection.But void fraction or mass dryness fraction are again
It is relatively difficult to obtain.Pressure reduction, electrical conductivity etc. can indirect reaction void fraction, be the secondary selection of research flow pattern problem.Biphase
Flow measurement technology development comparative maturity, as the capacitance measurement method of aforementioned Chinese patent CN1595132A can record liquid film thickness
Degree, and the probe circuit measured is simpler.Thickness of liquid film can represent void fraction, and individually using just can identification division exemplary flow
Type.Existing scholar uses advanced signal processing technology to select object to be analyzed research pressure reduction, electrical conductivity etc. second, carries
Take the characteristic quantity inadequate direct reaction flow pattern of flow pattern.
Summary of the invention
It is contemplated that one of technical problem solved the most to a certain extent in correlation technique.
To this end, it is an object of the present invention to propose a kind of horizontal flow pattern of gas-liquid two-phase flow to quantitatively judge method, the party
Method can improve the suitability of judgement, reliability and accuracy.
Further object is that a kind of horizontal flow pattern of gas-liquid two-phase flow of proposition quantitatively judges device.
For reaching above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of horizontal flow pattern of gas-liquid two-phase flow and quantitatively judges
Method, comprises the following steps: obtain two phase flow thickness of liquid film data under multiple flow pattern；According to multi-scale entropy concept to described multiple
Under flow pattern, two phase flow thickness of liquid film data carry out signal processing analysis, to extract the feature of different flow pattern；According to extracting not
Obtain multi-scale entropy arranged distribution characteristic curve with the feature of flow pattern, and calculate multi-scale entropy arranged distribution figure difference flow pattern curve
Multi-scale entropy rate；According to two phase flow thickness of liquid film data, described multi-scale entropy arranged distribution feature song under described multiple flow pattern
Line, described multi-scale entropy rate set up flow pattern data base, to obtain the quantitative judgement form of Flow Regime Ecognition, thus by described flow pattern
Identify quantitatively judges the purpose that form realizes judging.
The horizontal flow pattern of gas-liquid two-phase flow of the embodiment of the present invention quantitatively judges method, measures technology and many based on thickness of liquid film
Scale Entropy signal processing technology, thus use multiphase flow measurement technology real with the method that modern Stochastic signal processing technology combines
Now to horizontal pipe two phase flow pattern identification, multi-scale entropy algorithm process two phase flow thickness of liquid film signal can be used, compensate for
Single use deficiency in terms of meteor trail echoes, extracts characteristic quantity and reaches the purpose of Flow Regime Ecognition, improve the suitability of judgement
And reliability, improve the accuracy of judgement, simple and convenient.
It addition, horizontal flow pattern of gas-liquid two-phase flow according to the above embodiment of the present invention quantitatively judge method can also have with
Lower additional technical characteristic:
Further, in one embodiment of the invention, monofilament capacitance probe is used to measure two phase flow thickness of liquid film, institute
Method of stating also includes: is normalized by the liquid membrane under different tube diameters difference flow pattern, and calculates average thickness of liquid film.
Further, in one embodiment of the invention, the computing formula of described average thickness of liquid film is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Further, in one embodiment of the invention, when being to measure described two phase flow thickness of liquid film, it is being perpendicular to
Horizontal pipe flow direction, diametrically arranges two plain conductors.
Further, in one embodiment of the invention, described according to multi-scale entropy concept under described multiple flow pattern
Two phase flow thickness of liquid film data carry out signal processing analysis, farther include: original time series is made coarse and processes, then
To its Sample Entropy of each dimension calculation, to make the multi-scale entropy arranged distribution characteristic curve diagram of different flow pattern, and it is bent to calculate each bar
The multi-scale entropy rate of rise of line.
For reaching above-mentioned purpose, another aspect of the present invention embodiment proposes a kind of horizontal flow pattern of gas-liquid two-phase flow and quantitatively sentences
Determine device, including: acquisition module, it is used for obtaining two phase flow thickness of liquid film data under multiple flow pattern；Processing module, for according to many
Scale Entropy concept carries out signal processing analysis to two phase flow thickness of liquid film data under described multiple flow pattern, to extract different flow pattern
Feature；Computing module, for obtaining multi-scale entropy arranged distribution characteristic curve according to the feature of the different flow patterns extracted, and counts
Calculate the multi-scale entropy rate of multi-scale entropy arranged distribution figure difference flow pattern curve；Determination module, for according under described multiple flow pattern
Two phase flow thickness of liquid film data, described multi-scale entropy arranged distribution characteristic curve, described multi-scale entropy rate set up flow pattern data base,
To obtain the quantitative judgement form of Flow Regime Ecognition, thus realize the mesh of judgement by the form that quantitatively judges of described Flow Regime Ecognition
's.
The horizontal flow pattern of gas-liquid two-phase flow of the embodiment of the present invention quantitatively judges device, measures technology and many based on thickness of liquid film
Scale Entropy signal processing technology, thus use multiphase flow measurement technology real with the method that modern Stochastic signal processing technology combines
Now to horizontal pipe two phase flow pattern identification, multi-scale entropy algorithm process two phase flow thickness of liquid film signal can be used, compensate for
Single use deficiency in terms of meteor trail echoes, extracts characteristic quantity and reaches the purpose of Flow Regime Ecognition, improve the suitability of judgement
And reliability, improve the accuracy of judgement, simple easily realization.
It addition, horizontal flow pattern of gas-liquid two-phase flow according to the above embodiment of the present invention quantitatively judge device can also have with
Lower additional technical characteristic:
Further, in one embodiment of the invention, monofilament capacitance probe is used to measure two phase flow thickness of liquid film, institute
State acquisition module to be additionally operable to be normalized the liquid membrane under different tube diameters difference flow pattern, and it is thick to calculate average liquid film
Degree.
Further, in one embodiment of the invention, the computing formula of described average thickness of liquid film is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Further, in one embodiment of the invention, when being to measure described two phase flow thickness of liquid film, it is being perpendicular to
Horizontal pipe flow direction, diametrically arranges two plain conductors.
Further, in one embodiment of the invention, described processing module is further used for original time series
Make coarse to process, then to its Sample Entropy of each dimension calculation, bent to make the multi-scale entropy arranged distribution feature of different flow pattern
Line chart, and calculate the multi-scale entropy rate of rise of each bar curve.
Aspect and advantage that the present invention adds will part be given in the following description, and part will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or that add aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially with easy to understand, wherein:
Fig. 1 is the flow chart that the horizontal flow pattern of gas-liquid two-phase flow according to the embodiment of the present invention quantitatively judges method；
Fig. 2 is the structural representation of the measurement system of the thickness of liquid film according to one embodiment of the invention；
Fig. 3 is the principle schematic of the monofilament capacitance probe according to one embodiment of the invention；
Fig. 4 is the moisture film altitude signal multi-scale entropy schematic diagram of the various flow patterns according to one embodiment of the invention；
Fig. 5 is the stratified flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Fig. 6 is the annular flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Fig. 7 is the slug flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Fig. 8 is the slug flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Fig. 9 is the wave flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Figure 10 is the bubble flow moisture film altitude signal schematic diagram according to one embodiment of the invention；
Figure 11 is the structural representation that the horizontal flow pattern of gas-liquid two-phase flow according to the embodiment of the present invention quantitatively judges device.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most from start to finish
Same or similar label represents same or similar element or has the element of same or like function.Below with reference to attached
The embodiment that figure describes is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
Describe with reference to the accompanying drawings and propose according to embodiments of the present invention, describe according to the present invention real the most with reference to the accompanying drawings
Execute what example proposed.
Fig. 1 is the flow chart of the horizontal flow pattern of gas-liquid two-phase flow quantitative judgement method of the embodiment of the present invention.
Comprise the following steps as it is shown in figure 1, this horizontal flow pattern of gas-liquid two-phase flow quantitatively judges method:
In step S101, obtain two phase flow thickness of liquid film data under multiple flow pattern.
Wherein, in one embodiment of the invention, using monofilament capacitance probe to measure two phase flow thickness of liquid film, method is also
Including: the liquid membrane under different tube diameters difference flow pattern is normalized, and calculates average thickness of liquid film.
Further, in one embodiment of the invention, the computing formula of average thickness of liquid film is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Further, in one embodiment of the invention, when being to measure two phase flow thickness of liquid film, it is being perpendicular to level
Pipeline flow direction, diametrically arranges two plain conductors.
Such as, Fig. 2 is whole measurement system diagram, shown in Fig. 2, monofilament capacitance probe can be used to measure thickness of liquid film, survey
Amount system includes monofilament capacitance probe, capacitance measurement circuit, capacitance-voltage conversion circuit, data collecting card, computer.By difference
Liquid membrane under caliber difference flow pattern is normalized, and calculates average thickness of liquid film and is represented by formula:
In formula, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, and D is horizontal pipe diameter.
Wherein, Fig. 3 is monofilament capacitance probe schematic diagram.
Monofilament capacitance probe in water constitutes a cylindrical capacitor.The one of capacitor extremely insulated conductor metal
Silk, the insulating barrier of conductive line surfaces serves as electrolyte, and another extremely envelope is at the liquid film i.e. conductive phase water of conductive line surfaces.Cylindrical
The capacitance of capacitor can be determined by following formula:
In formula, l is to cover the moisture film length in conductive line surfaces, and ε is the dielectric constant of insulating barrier, d1For wire metals core
Diameter, d2For wire insulation external diameter.
When for full liquid phase, the capacitance recorded is maximum.When biphase gas and liquid flow flows through monofilament capacitance probe, detecting probe surface
Can random being covered by liquid phase or gas phase.Assuming a certain moment, the monofilament capacitance probe surface gas-liquid got involved in pipe is distributed such as
Shown in Fig. 3, now defining a capacitor in parallel, capacitance is that each equivalent capacity sum can be determined by following formula:
In formula, liCover the moisture film length in conductive line surfaces, the dielectric constant of ε insulating barrier, d1The diameter of wire metals core,
d2Wire insulation external diameter.
Due to ε, d1, d2, all keep constant, thus measure electric capacity and only just become in the length that conductive line surfaces moisture film is total with covering
Ratio.Using monofilament capacitance probe as electrode series RC circuit, choose suitable RC value and can eliminate interference.Capacitance signal is converted
For voltage signal, through data collecting card, in computer, finally obtain a magnitude of voltage experimental data.During experiment, probe is short
Rood to one voltage signal U1, capacitance C that corresponding circuits carries1；Pipeline is completely filled with water, the magnitude of voltage U recorded2Right
Answer monofilament capacitance probe maximum capacitor value CmaxCapacitance C is carried with circuit1Sum.When biphase gas and liquid flow flows through probe, if this
Time the voltage signal that records be U, then thickness of liquid film accounts for the ratio of whole pipe diameterReferred to as pipeline thickness of liquid film or liquid film
Height can be determined by following formula formula:
In step s 102, according to multi-scale entropy concept, two phase flow thickness of liquid film data under multiple flow pattern are carried out at signal
Reason is analyzed, to extract the feature of different flow pattern.
Further, in one embodiment of the invention, according to multi-scale entropy concept to flow liquid biphase under multiple flow pattern
Film thickness data carries out signal processing analysis, farther includes: original time series is made coarse and processes, then to each yardstick
Calculate its Sample Entropy, to make the multi-scale entropy arranged distribution characteristic curve diagram of different flow pattern, and calculate many chis of each bar curve
Degree entropy rate of rise.
It is to say, the experimental data thickness of liquid film signal of the different tube diameters difference flow pattern recorded carries out multi-scale entropy mathematics
Method processes.First multi-scale entropy (MSE) calculates makees coarse process, then to its sample of each dimension calculation by original time series
This entropy.
Sample Entropy specific algorithm is as follows:
(1) for an a length of N original time series u (i): i=1,2 ..., N}.
(2) available N-m+1 phase space vector X is obtained by numeric orderm(i) (1≤i≤N-m+1), Xm(i)={ u (i
+ k): 0≤k≤m-1}.
(3) ultimate range between two vectorial X (i) of definition and X (j) is:
D [X (i), X (j)]=max { | u (i+k)-u (j+k) |: 0≤k≤m-1}.
(4) given threshold value r, for each 1≤i≤N-m, statistics meets d [Xm(i),Xm(j)] less than the number of threshold value r,
And the ratio of this number N-m-1 total with distance, it is denoted asWherein i ≠ j gets rid of self coupling.
Definition:
(5) in like manner, according to above-mentioned steps, statistical vector Xm+1(i) and vector Xm+1Distance d [the X of (j)m+1(i),Xm+1(j)]
Number in the range of tolerance limit r, and the ratio of N-m-1 total with distance, be denoted asAnd i ≠ j.Have:
Sample Entropy is defined as:
SampEn (m, r)=limN→∞(-ln[Am(r)/Bm(r)]),
Multi-scale entropy algorithm is as follows:
For an a length of N original time series u (i) :=1,2 ..., N}, build coarse sequence { yτ(j): j
=1,2 ..., N/ τ }, wherein,
Multiple windows of a length of τ of non-overlapping copies will be divided into by original series, the data in each window are asked flat
All being worth to new sequence, corresponding yardstick is τ.Threshold value r takes 0.1-0.25 times of original time series standard deviation (SD), calculates
Under each yardstick, the sample entropy of coarse sequence, is multi-scale entropy.
In step s 103, obtain multi-scale entropy arranged distribution characteristic curve according to the feature of the different flow patterns extracted, and
Calculate the multi-scale entropy rate of multi-scale entropy arranged distribution figure difference flow pattern curve.
In step S104, according to two phase flow thickness of liquid film data, multi-scale entropy arranged distribution feature song under multiple flow pattern
Line, multi-scale entropy rate set up flow pattern data base, to obtain the quantitative judgement form of Flow Regime Ecognition, thus determining by Flow Regime Ecognition
Amount judges that form realizes the purpose judged.
It is to say, make the multi-scale entropy arranged distribution characteristic curve diagram of different flow pattern, calculate many chis of each bar curve
Degree entropy rate of rise, reaction is slope of a curve on curve.With to Scale Entropy characteristic curve, multi-scale entropy rate, average liquid
Three physical quantitys of film thickness, set up flow pattern database table.
In an embodiment of the present invention, the method for the embodiment of the present invention uses monofilament capacitance probe measuring method to obtain difference
Thickness of liquid film experimental data under caliber difference flow pattern；By multi-scale entropy, experimental data is carried out signal processing, extract flow pattern features
Amount reaches the purpose of Flow Regime Ecognition, and first multi-scale entropy (MSE) calculates makees coarse process, then to respectively by original time series
Its Sample Entropy of dimension calculation.Make the multi-scale entropy arranged distribution characteristic curve diagram of different flow pattern, calculate many chis of each bar curve
Degree entropy rate of rise, reaction is slope of a curve on curve, and then with multi-scale entropy characteristic curve, multi-scale entropy rate, flat
All three physical quantitys of thickness of liquid film, set up flow pattern database table.Wherein, choose this fluctuation parameters of thickness of liquid film to know as flow pattern
The basis do not studied, when measuring thickness of liquid film, it is only necessary to be perpendicular to horizontal pipe flow direction, diametrically arranges two metals
Wire.
Specifically, according to flow process in Fig. 1, measure system and principle according to such as Fig. 2, described in 3, it is possible to obtain 58 groups each
Plant the thickness of liquid film experimental data under different flow patterns.Experimental data is processed according to multi-scale entropy, obtains under different flow pattern
Multi-scale entropy arranged distribution figure is as shown in Figure 4.Fig. 4 is analyzed, extracts following characteristics:
Under low yardstick, bubble flow entropy is the highest, is secondly respectively annular flow and stratified flow, slug flow, slug flow and wave flow
Minimum.Seeing on the whole, the entropy of bubble flow constantly reduces along with dimension line, finally tends towards stability；Annular flow and stratified flow are all
Reduce afterwards along with yardstick increase first increases, but both obvious differences on little yardstick, and intersect at the 5th yardstick, crest location is also
Variant；Under low yardstick, the entropy of slug flow, slug flow and wave flow is more than slug flow very close to, the entropy of slug flow, all
Have the most linear, calculate its entropy rate according to the definition (the linear fit slopes of front 6 yardstick entropy) of multi-scale entropy rate and find, plug
The multi-scale entropy rate of shape stream concentrates on 0.007～0.01, and slug flow is then 0.01～0.025.Experiment has recorded a large amount of wave flow,
Their entropy scope overlaps with slug flow and slug flow, and multi-scale entropy rate scope is the biggest, between 0.002～0.026, and can
See that wave flow can not be distinguished by multi-scale entropy rate.Although noticing that wave flow is at front 6 yardsticks and slug flow, slug flow very phase
Seemingly, but the entropy of wave flow all occurs in that obvious downward trend under large scale, and this makes they and slug flow and slug flow
Differentiation occurs.
Rely solely on multi-scale entropy arrangement figure and multi-scale entropy rate, be merely able to distinguish bubble flow, slug flow, slug flow.But
From the point of view of single curve, it is difficult to slug flow and wave flow, stratified flow etc. are distinguished.Thickness of liquid film inherently can react flow pattern,
Therefore making under different flow pattern, average thickness of liquid film curve, as shown in Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10.To above-mentioned figure
Analyze, analyze flow pattern in conjunction with thickness of liquid film, it can be deduced that following characteristics:
There is wave phenomenon in stratified flow interface, as it is shown in figure 5, moisture film height is about 0.17.In conjunction with Fig. 4 it will be seen that
In detail, the fluctuation of stratified flow is erratic, and under the least yardstick, entropy is higher；But big spatial and temporal scales lower leaf stream
There is more stable relative moisture film height, rise and fall less, therefore when large scale calculates, obtain each window needed for new sequence
Meansigma methods can be more nearly along with yardstick increase, reflection multi-scale entropy on, under large scale, entropy can be more and more less.
When gas phase velocity is the highest, high velocity air occupies pipeline center position, and liquid film is distributed in pipeline surrounding, is formed ring-type
Stream.By action of gravity in transverse tube, liquid film distribution is the most uneven.Moisture film altitude curve as shown in Figure 6, due to middle gaseous core motion
Speed is the highest, compares stratified flow, and annular flow curve vibration frequency is higher, and amplitude is the biggest.As can be seen from the figure liquid membrane
Signal amplitude is more than 0.2.This makes annular flow in detail more irregular than stratified flow；Under big spatial and temporal scales, although ripple
Dynamic violent, but the scope of signal fluctuation is the least so that and the meansigma methods of the thickness of liquid film of different windows annular flow is as well as yardstick
Increase and close, so that entropy constantly reduces.
Slug flow and slug flow can be concluded as intermittent flow, and their be structurally characterized in that can be divided into liquid bullet significantly
District and liquid film district, both replace, as shown in Figure 7, Figure 8.Alternately become it will be seen that liquid film liquid bullet is regular in slug flow pipeline
Changing and their moisture film altitude signal is had periodically, therefore entropy is relatively low.
In slug flow, gas phase velocity is bigger, and gas-liquid two-phase mixability is aggravated so that bubbles substep is in the middle of liquid plug in a large number,
The curve table of fluctuation understands the existence of bubble.Compared with slug flow, slug flow fluidal texture is more complicated, is reflected in multi-scale entropy
The upper entropy for slug flow is higher than the entropy of slug flow, and slug flow macroscopic view compares the more complicated confusion of slug flow on the whole, therefore bullet
The entropy rate of rise of shape stream than slug flow more faster, its this be also to discriminate between the key of both flow patterns.Use multi-scale entropy rate energy
Enough the most quantitatively two kinds of flow patterns of differentiation.
Wave flow thickness of liquid film signal is as shown in Figure 9.In stratified flow, along with the further increasing of boundary velocity, liquid
Defined the structure of obvious crest by the impact of gas, crest is mingled with bubble, the crest that the impact of gas is formed
There is certain periodicity, but the cycle be longer, be up to three crests in the acquisition time of 10s, steadily after show as again layering
The altitude signal feature of stream.This crest is similar to the liquid bullet of slug flow, but height is only about 0.8 times of slug flow, liquid film
District is the thinnest.So liquid film and liquid bullet alternately so that the structure of the moisture film altitude signal of wave flow, little spatial and temporal scales connects
The structure of nearly slug flow, under big spatial and temporal scales, the crest effect of wave flow is cut in so that its changes of entropy shows layering
The feature of stream, breaks up with slug flow and slug flow and comes.Additionally, due to liquid bullet height is far below slug flow, therefore can be with flat
All water film thicknesses are effectively distinguished.
Bubble flow thickness of liquid film signal is as shown in Figure 10.Bubble flow feature is obvious, and liquid membrane is about 1.Bubble flow pair
Scale Entropy is worth maximum under little yardstick, is therefore easily discriminated.
Being analyzed by above, arrange figure by average liquid membrane, multi-scale entropy rate and multi-scale entropy, make table 1, table 1 is
Moisture film altitude curve parametric statistics result and multi-scale entropy mark sheet under different flow patterns, as follows, as the number of flow pattern judgement
According to storehouse.
Table 1
Horizontal channel flow pattern of gas-liquid two-phase flow criterion:
Bubble flow: the multi-scale entropy curve of monotone decreasing, liquid film average thickness L ' > 0.99；
Annular flow: first increase the multi-scale entropy curve reduced afterwards, the 1st yardstick entropy is more than 0.8, and obtains at the 2nd or 3 yardsticks
To peak value；
Stratified flow: first increase the multi-scale entropy curve reduced afterwards, the 1st yardstick entropy is less than 0.8, and obtains at the 5th yardstick
Peak value；
Wave flow: monotonically increasing multi-scale entropy curve, liquid film average thickness L ' < 0.50；
Slug flow: monotonically increasing multi-scale entropy curve, liquid film average thickness L '>0.50, multi-scale entropy rate 0<k<0.1；
Slug flow: monotonically increasing multi-scale entropy curve, liquid film average thickness L '>0.70, multi-scale entropy rate 0.1<k<
0.25。
Horizontal flow pattern of gas-liquid two-phase flow according to embodiments of the present invention quantitatively judges method, measures technology based on thickness of liquid film
And multi-scale entropy signal processing technology, thus use the side that multiphase flow measurement technology combines with modern Stochastic signal processing technology
Method realizes horizontal pipe two phase flow pattern identification, can use multi-scale entropy algorithm process two phase flow thickness of liquid film signal, more
Mend single use deficiency in terms of meteor trail echoes, extracted characteristic quantity and reach the purpose of Flow Regime Ecognition, improve the suitable of judgement
By property and reliability, improve the accuracy of judgement, simple and convenient.
Describe the horizontal flow pattern of gas-liquid two-phase flow proposed according to embodiments of the present invention referring next to accompanying drawing and quantitatively judge device.
Figure 11 is the structural representation of the horizontal flow pattern of gas-liquid two-phase flow quantitative judgement device of the embodiment of the present invention.
As shown in figure 11, this horizontal flow pattern of gas-liquid two-phase flow quantitative judgement device 10 includes: acquisition module 100, process mould
Block 200, computing module 300 and determination module 400.
Wherein, acquisition module 100 is used for obtaining two phase flow thickness of liquid film data under multiple flow pattern.Processing module 200 is used for
According to multi-scale entropy concept, two phase flow thickness of liquid film data under multiple flow pattern are carried out signal processing analysis, to extract various flows
The feature of type.Computing module 300 obtains multi-scale entropy arranged distribution characteristic curve for the feature of the different flow patterns according to extraction,
And calculate the multi-scale entropy rate of multi-scale entropy arranged distribution figure difference flow pattern curve.Determination module 400 is for according to multiple flow pattern
Lower two phase flow thickness of liquid film data, multi-scale entropy arranged distribution characteristic curve, multi-scale entropy rate set up flow pattern data base, to obtain
The quantitative judgement form of Flow Regime Ecognition, thus realize the purpose of judgement by the form that quantitatively judges of Flow Regime Ecognition.The present invention is real
The decision maker 10 executing example can use multi-scale entropy algorithm process two phase flow thickness of liquid film signal, extracts characteristic quantity and reaches flow pattern
The purpose identified, improves the suitability and the reliability of judgement, improves the accuracy of judgement.
Further, in one embodiment of the invention, use monofilament capacitance probe to measure two phase flow thickness of liquid film, obtain
Delivery block is additionally operable to be normalized the liquid membrane under different tube diameters difference flow pattern, and calculates average thickness of liquid film.
Further, in one embodiment of the invention, the computing formula of average thickness of liquid film is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Further, in one embodiment of the invention, when being to measure two phase flow thickness of liquid film, it is being perpendicular to level
Pipeline flow direction, diametrically arranges two plain conductors.
Further, in one embodiment of the invention, processing module 200 is further used for making original time series
Coarse processes, then to its Sample Entropy of each dimension calculation, to make the multi-scale entropy arranged distribution characteristic curve of different flow pattern
Figure, and calculate the multi-scale entropy rate of rise of each bar curve.
It should be noted that the aforementioned explanation that horizontal flow pattern of gas-liquid two-phase flow quantitatively judges embodiment of the method is also fitted
Horizontal flow pattern of gas-liquid two-phase flow for this embodiment quantitatively judges device, and here is omitted.
Horizontal flow pattern of gas-liquid two-phase flow according to embodiments of the present invention quantitatively judges device, measures technology based on thickness of liquid film
And multi-scale entropy signal processing technology, thus use the side that multiphase flow measurement technology combines with modern Stochastic signal processing technology
Method realizes horizontal pipe two phase flow pattern identification, can use multi-scale entropy algorithm process two phase flow thickness of liquid film signal, more
Mend single use deficiency in terms of meteor trail echoes, extracted characteristic quantity and reach the purpose of Flow Regime Ecognition, improve the suitable of judgement
By property and reliability, improve the accuracy of judgement, simple and convenient.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward ", " up time
Pin ", " counterclockwise ", " axially ", " radially ", the orientation of the instruction such as " circumferential " or position relationship be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description rather than instruction or imply that the device of indication or element must
Must have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
Individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For those of ordinary skill in the art
For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office
One or more embodiments or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel
Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification.
Claims (10)
1. a horizontal flow pattern of gas-liquid two-phase flow quantitatively judges method, it is characterised in that comprise the following steps:
Obtain two phase flow thickness of liquid film data under multiple flow pattern；
According to multi-scale entropy concept, two phase flow thickness of liquid film data under described multiple flow pattern are carried out signal processing analysis, to extract
Go out the feature of different flow pattern；
Feature according to the different flow patterns extracted obtains multi-scale entropy arranged distribution characteristic curve, and calculates multi-scale entropy arrangement point
The multi-scale entropy rate of Butut difference flow pattern curve；And
According to two phase flow thickness of liquid film data under described multiple flow pattern, described multi-scale entropy arranged distribution characteristic curve, described many
Scale Entropy rate sets up flow pattern data base, to obtain the quantitative judgement form of Flow Regime Ecognition, thus determining by described Flow Regime Ecognition
Amount judges that form realizes the purpose judged.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 1 quantitatively judges method, it is characterised in that use monofilament electricity
Holding probe measurement two phase flow thickness of liquid film, described method also includes:
Liquid membrane under different tube diameters difference flow pattern is normalized, and calculates average thickness of liquid film.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 2 quantitatively judges method, it is characterised in that described average liquid
The computing formula of film thickness is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 2 quantitatively judges method, it is characterised in that be to measure institute
When stating two phase flow thickness of liquid film, it is perpendicular to horizontal pipe flow direction, diametrically arranges two plain conductors.
Horizontal two-phase flow flow pattern the most according to claim 1 quantitatively judges method, it is characterised in that described according to multiple dimensioned
Entropy concept carries out signal processing analysis to two phase flow thickness of liquid film data under described multiple flow pattern, farther includes:
Original time series is made coarse process, then to its Sample Entropy of each dimension calculation, to make many chis of different flow pattern
Degree entropy arranged distribution characteristic curve diagram, and calculate the multi-scale entropy rate of rise of each bar curve.
6. a horizontal flow pattern of gas-liquid two-phase flow quantitatively judges device, it is characterised in that including:
Acquisition module, is used for obtaining two phase flow thickness of liquid film data under multiple flow pattern；
Processing module, for carrying out at signal two phase flow thickness of liquid film data under described multiple flow pattern according to multi-scale entropy concept
Reason is analyzed, to extract the feature of different flow pattern；
Computing module, for obtaining multi-scale entropy arranged distribution characteristic curve according to the feature of the different flow patterns extracted, and calculates
The multi-scale entropy rate of multi-scale entropy arranged distribution figure difference flow pattern curve；And
Determination module, for according to two phase flow thickness of liquid film data, described multi-scale entropy arranged distribution spy under described multiple flow pattern
Levy curve, described multi-scale entropy rate sets up flow pattern data base, to obtain the quantitative judgement form of Flow Regime Ecognition, thus by described
The form that quantitatively judges of Flow Regime Ecognition realizes the purpose of judgement.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 6 quantitatively judges device, it is characterised in that use monofilament electricity
Holding probe measurement two phase flow thickness of liquid film, described acquisition module is additionally operable to carry out the liquid membrane under different tube diameters difference flow pattern
Normalized, and calculate average thickness of liquid film.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 7 quantitatively judges device, it is characterised in that described average liquid
The computing formula of film thickness is:
Wherein, h is horizontal pipe biphase gas and liquid flow thickness of liquid film, D horizontal pipe diameter.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 6 quantitatively judges device, it is characterised in that be to measure institute
When stating two phase flow thickness of liquid film, it is perpendicular to horizontal pipe flow direction, diametrically arranges two plain conductors.
Horizontal flow pattern of gas-liquid two-phase flow the most according to claim 6 quantitatively judges device, it is characterised in that described process
Module is further used for that original time series is made coarse and processes, then to its Sample Entropy of each dimension calculation, to make difference
The multi-scale entropy arranged distribution characteristic curve diagram of flow pattern, and calculate the multi-scale entropy rate of rise of each bar curve.
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