CN106226392A - Water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model - Google Patents

Abstract

The present invention relates to a kind of water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model, use a main reception sensor and 6 assisting ultrasonic to receive sensor；Step is as follows: set the detection signal V of main reception sensor₂, the detection signal of 6 assisting ultrasonic reception sensor auxiliary reception sensors is respectively V₃……V₈, calculate detection signal V₂, V₃……V₈With pumping signal V₁Ultrasound intensity decay；In calculating pipeline, total ultrasonic attenuation coefficient of oil-water two-phase flow fluid and each assisting ultrasonic receive the ultrasonic diffusive attenuation amount sum of sensor；Detect main reception sensor and receive signal and signal emission sensor sends transition time of pumping signal；Calculate water-oil phase scattering parameter；Calculate each phase content of oil-water two-phase flow.The present invention can promote the estimated accuracy of point moisture content.

Description

Water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model

Technical field

The invention belongs to fluid measurement technical field, relate to a kind of measuring method based on ultrasonic sound intensity decay mechanism, use Non-contact measurement in water-oil phase flow containing rate.

Technical background

In the industrial processes such as nature and power, oil, chemical industry, metallurgy and Aero-Space, multiphase flow is existing As being widely present.The most in the oil industry, the fluid in oil well is often concurrently present in for oil, three kinds of fluids of gas and water；In power plant In power generation process, the coal dust as fuel exists for gas, solid phase in course of conveying simultaneously.In oil exploitation modal heterogeneous Flow phenomenon is exactly oil-water two-phase flow.The high speed development produced along with modern industry, the expansion of the scale of production technology and technique Complexity, the requirement to flow parameter measurement precision each in multiphase flow is more and more higher, accurately measures multiphase flow flow parameter pair The optimization of production process and process management has highly important meaning.The dynamics of monophasic fluid is relatively easy, many It is sufficiently complex that phase fluid is different from monophasic fluid, two phase flow or three-phase flow flow behavior, and it has the streams such as non-linear, alternate slippage Dynamic feature, its parameter measurement problem remains a more difficult problem.

The detection of phase content is an important parameter index in Multi phase Flow Testing Technique research.Can according to its measuring principle To be divided into: measurement method of electricity, ray method, fast valve are directly measured, velocity measurement, optical method measure, nuclear magnetic resonance method and Microwave method etc..Measuring method based on ultrasonic technology is a kind of contactless detection means, by analyzing transmission ultrasonic wave Decay or the ultrasonic signal of reflection, can obtain the parameter such as concentration and speed of detected fluid.But, use ultrasonic technology When realizing the test of multiphase flow phase content, there is the problems such as nonlinearity

Measuring of phase ratio method based on ultrasonic attenuation principle has simple in construction, low cost and other advantages.Ultrasonic instrument There is non-intruding characteristic and the function of " i.e. press from both sides and i.e. use " can be realized.Application ultrasonic technology realizes the detection of multiphase flow parameter, tool Have do not affected by measured medium salinity, not interference flowing field, there is not flow-induced corrosion, abrasion, it is adaptable to non-light transmittance, non-conductive The advantages, particularly ultrasound wave such as property medium have sensitiveer sensing capability to profit boundary.Therefore, for oil-water two-phase flow The basic test mechanism of the ultrasonic technology of procedure parameter, uses limited element analysis technique, by setting up Jie mutually of oil-water two-phase flow Matter distributed model.Sound field emulation is being carried out, it is thus achieved that the distribution signal of excess sound pressure is analyzed under different fluidal textures, it is achieved The sign of water-oil phase flow containing rate.The present invention proposes a kind of two phase flow based on ultrasonic attenuation mechanism and tests device containing rate, Utilize sonac receiving terminal to receive signal and the intensity difference launched between signal calculates phase content, calculate speed fast, response Linearisation.

CN2005101237388 discloses a kind of ultrasonic wave water flow measuring system, be driven by drive system ultrasonic Ripple calibrator, measures the water depth value of some sampled points on the waters of irregular section, and measures water flow velocity by water flow meter Degree, then calculated the area of section in this waters by control system after, then obtains discharge.This system has passed through middle ginseng , there is the unstability between information exchange and the limitation of the scope of measurement in number water velocity information indirect conversion.

In CN2014103282688, ultrasonic sensor array includes two groups of ultrasonic probe arrays, and often group linear transducer array is by many The individual probe being distributed in tested pipeline same cross-sectional position is constituted.But when discrete phase content is the lowest, sonac is corresponding There is nonlinear problem.

Summary of the invention

It is an object of the invention to provide a kind of reproducible, that sensitivity is higher two phase flow phase content non-contact measurement side Method.Technical scheme is as follows:

A kind of water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model, the device used comprises super Sonic transducer, signal generating unit, exciting circuit unit, excitation with receiving transducer channel selection unit, testing circuit unit and Flow parameter computing unit.Described ultrasonic transducer comprises signal emission sensor and receives sensor, receives sensor again Just it is divided into main reception sensor and auxiliary reception sensor, described signal emission sensor and main reception sensor straight line respectively To the bottom and the top that are arranged on pipeline；Six auxiliary reception sensors are evenly distributed on signal emission sensor and main reception biography The both sides of sensor；Described signal generating unit is connected with exciting circuit unit and acoustic pressure detector, and signal generating unit produces Raw pulse voltage signal, is encouraged signal emission sensor by exciting circuit unit, and excitation is selected with receiving transducer passage Select unit and be connected with receiving sensor, it is achieved each receives sensor and receives signal respectively.Step is as follows:

Step 1: when in pipeline by detected fluid, signal generating unit produces pulse signal, by exciting circuit list Unit applies pumping signal to signal emission sensor, and the ultrasound wave with certain amplitude and frequency passes through tested region, arrives main Receiving sensor and 6 assisting ultrasonic receive sensor, the detection signal of each auxiliary reception sensor is by excitation and receives Probe channel selection unit gating receives sensor, is connected with testing circuit unit, and receiving circuit unit obtains receiving sensor Voltage signal, be then fed into signal demodulation module, by signal is demodulated process.

Step 2: set the detection signal V of main reception sensor₂, 6 assisting ultrasonic receive sensor auxiliary reception sensor Detection signal be respectively V₃……V₈, calculate detection signal V₂, V₃……V₈With pumping signal V₁Ultrasound intensity decayWherein, l is signal emission sensor and the distance of main reception sensor, and n is 2,3 ... 8；

Step 3: total ultrasonic attenuation coefficient of oil-water two-phase flow fluid in calculating pipelineSuper with each auxiliary The ultrasonic diffusive attenuation amount sum of sound reception sensor

Step 4: detect main reception sensor and receive signal and signal emission sensor sends when getting over of pumping signal Between t, calculate attenuation by absorption amountWherein,F is frequency of sound wave；η is that continuous phase is glued Degree；ρ is continuous phase density, and c is the two-phase fluid velocity of sound,T receives signal and ultrasound emission for detecting main reception sensor End sends the transition time of pumping signal；N and m represents the index of f and c respectively, is affected by temperature T, and n value is 2, m value It is 3.

Step 5: calculate water-oil phase scattering parameterWherein, k is the wave number of ultrasound wave in continuous phase, i.e.Wherein,c₀For the velocity of sound in continuous phase；R is discrete phase droplet radius；Re[A₀] represent take A₀Real part, parameter A₀ For discrete phase partial wave wave amplitude；

Step 6: utilize multiple physical field emulation experiment to calculate a border correction factor, by the main reception of boundary integral Yu border The ratio of sensor and 6 assisting ultrasonic reception sensor sums is worth 1.2225, and actual tests corrects b measurement model error ginseng Number, b isBring into based on ultrasonic attenuation mechanism model formulaCalculate each of oil-water two-phase flow Phase content.

Beneficial effects of the present invention and advantage are as follows:

1, liquid-liquid distribution is obtained by the sound pressure information of the sensor arrangement mode acquisition different azimuth of multicast formula Oil phase content.Eight ultrasonic transducers are evenly distributed on the same cross section of pipeline, by the sensor arrangement mode of multicast formula, Obtain the sound pressure information of each sensor to calculate the ultrasonic attenuation amount in each orientation, do based on ultrasonic as fundamental measurement value The mathematical model of decay mechanism calculates each phase content measuring liquid-liquid distribution.Two phase flow phase content is obtained in non-intruding mode, Avoid the nonlinear response of ultrasound detection, and without measurement fluid is carried out pre-separation or mixing.

2, the method for not affected by measured medium salinity, not interference flowing field, there is not flow-induced corrosion, abrasion, be suitable for In non-light transmittance, non-conductive dielectric etc.；

3, measuring convenient, speed is fast, low cost, it is possible to accurately measures the phase content of oil-water two-phase flow in pipeline, reduces Nonlinearity.

Accompanying drawing explanation

The following drawings describes the embodiment selected by the present invention, is exemplary drawings and non exhaustive or restricted, its In:

The water-oil phase flow containing rate measurement side based on ultrasonic attenuation mechanism model that the measuring method of Fig. 1 present invention uses Method multicast formula multisensor mounting means structural representation；

The water-oil phase flow containing rate measurement side based on ultrasonic attenuation mechanism model that the measuring method of Fig. 2 present invention uses Method experimental system schematic diagram；

The emulation experiment Dependence Results of phase content under the working method of Fig. 3 present invention.

Detailed description of the invention

Manufacture described in detail below and the step of the operation present invention, it is intended to describe as embodiments of the invention, be not Other embodiments that can realize identical function also should be included in the scope of the present invention by the unique forms that can be manufactured or utilize In.

The preferred embodiments of the present invention are described in detail below in conjunction with Figure of description.

As it is shown in figure 1, ultrasonic emitting end sends the ultrasound wave of certain frequency and intensity, through the absorption etc. of water-oil phase After attenuating mechanism, arrive ultrasound signal receipt end.Owing to the distribution of different size of oil vacuole is different to the degree of absorption of ultrasound wave, The ultrasonic attenuation degree obtained on the receive side is also the most different.Pass between decaying according to oil vacuole size and ultrasonic intensity System, can record oil phase content.In oil-water two-phase flow, ultrasonic attenuation coefficient α is:

$\mathrm{\α}=-\frac{ln(V_2/V_1)}{l}$

In formula, V₁And V₂Representing ultrasonic emitting end and the intensity of acoustic wave (acoustic pressure) of receiving terminal respectively, l is transmitting terminal and connect The distance of receiving end.

The water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model that the measuring method of the present invention uses Sensor mounting means structural representation.In Fig. 1, eight ultrasonic transducers are evenly distributed on the arrangement mode in the same cross section of pipeline, I.e. pop one's head in and be made up of eight probes being distributed in tested pipeline same cross-sectional position.Pipeline top and bottom are ultrasonic transducer Ultrasonic emitting end and the main receiving terminal of ultrasound wave, both are the most corresponding.Assisting ultrasonic transducer 3,4,5 and ultrasonic transducer 6,7, 8 are evenly distributed in pipeline both sides, ultrasonic emitting end and ultrasound wave main receiving terminal both sides.

Fig. 2 describes ultrasonic signal and occurs and detector unit structure.Oil-water two-phase flow based on ultrasonic attenuation mechanism model Phase content measurement apparatus comprises signal generating unit, exciting circuit unit, excitation and receiving transducer channel selection unit, transmitting terminal Ultrasonic probe, receiving terminal ultrasonic probe, testing circuit unit, signal demodulation module and flow parameter computing unit.Signal occurs Unit is connected with receiving transducer channel selection unit with excitation by exciting circuit unit, and signal generating unit produces the electricity of pulse Pressure signal.Require to realize in pumping signal generation module the generation of pumping signal according to default, by excitation and reception Probe channel selection unit gates the corresponding probe of sonac on request.Ultrasound emission end 1 is carried out by exciting circuit unit Excitation, sonac 1 produces ultrasonic signal, makes pumping signal pass through electroacoustic translation function and produces ultrasound wave.Work as heterogeneous fluid Flowing through, ultrasound wave is when by propagation path, and after the attenuating mechanism such as absorption of water-oil phase, the master arriving duct bottom surpasses Acoustic signals receiving terminal, and some ultrasound wave received by the assisting ultrasonic receiving transducer of sidewall.The decay width of ultrasonic amplitude Degree has direct relation with the discrete phase phase content in transonic path.The reception signal of each sensor is visited with receiving by excitation Head channel selection unit gating receives sensor, is connected with testing circuit unit.This testing circuit electricity to each receiving transducer Pressure signal detects, and sends into signal demodulation module, by signal is demodulated process.Finally testing result is sent into flowing Parameter calculation unit, it is achieved the calculating of two phase flow phase content.

Under Fig. 3 multisensor of the present invention frame mode, the model experiment with computing Dependence Results of phase content, biphase with oil-in-water As a example by stream.If border correction factor a is 1.2225.Measurement model error parameter b isExtract oil-in-water In flow pattern during different oil content, each receiving terminal ultrasonic wave attenuation coefficient emulation data, and with surpassing that actual sending and receiving end obtains Sound attenuation value is foundation, is obtained by the oil content value of calculation of decay mechanism model.Curve shows, shows that oil content is overall tiltedly Rate be 1 straight line on scatterplot distribution.Occurring negative at actual oil content more than 37.87% value of calculation, algorithm lost efficacy.Thus demonstrate,prove Bright, water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model is existing when discrete phase content is less than about 35% Real feasible.Below as a example by Water-In-Oil two phase flow, illustrating the two phase flow phase content measuring method of the present invention, the method is also In can be used for measuring containing rate such as other two phase flows such as oil-in-water two phase flows.

The measuring method step utilizing above-mentioned measurement apparatus is as follows:

Step 1: eight sensor ring are under circular pipe mean array mode, when in pipeline by oil-water two-phase flow, The pulse signal that signal generating unit produces, applies pumping signal by exciting circuit unit to ultrasonic emitting end 1, with one The ultrasound wave of tentering value and frequency passes through tested region, finally to arrive and receive main sonac receiving terminal 2 and assisting ultrasonic Receiving terminal 3,4 ... 8.The reception signal of each sensor receives sensing by excitation with receiving transducer channel selection unit gating Device, is connected with testing circuit unit.Ultrasound wave receives the voltage signal of each reception sensor that circuit obtains, and is then fed into letter Number demodulation module, processes by being demodulated signal.Wherein V₁It is that ultrasound emission sensor 1 produces in water-oil phase medium Emitting voltage, V₂, V₃……V₈The reception voltage obtained for ultrasonic reception end.

Step 2: the reception voltage V that the ultrasonic reception end obtained by step 1 is obtained₂With ultrasound transmit signal V₁Together It is respectively fed to signal detector, obtains the ratio detecting signal with pumping signal, then result is sent into flow parameter computing unit, Obtaining the overall attenuation of ultrasonic oil-water two-phase flow, attenuation quotient α is defined as:

$\mathrm{\α}=-\frac{ln(V_2/V_1)}{l}---\left(1\right)$

In formula, V₁And V₂Representing ultrasonic emitting end and the intensity of acoustic wave (acoustic pressure) of receiving terminal respectively, l is transmitting terminal and connect The distance of receiving end.

V₃……V₈With ultrasound transmit signal signal V₁Send into signal detector together, obtain detecting signal V₃……V₈Respectively With pumping signal V₁Ratio, and then calculate boundary diffusion attenuation α of ultrasonic oil-water two-phase flow_D:

${\mathrm{\α}}_D=-\underset{n=3}{\overset{8}{\Σ}}\frac{ln(V_n/V_1)}{l}---\left(2\right)$

Step 3: detect main reception sensor and receive signal and ultrasound emission end sends the transition time t of pumping signal, Utilize Absorption Formula^[1～3]The attenuation by absorption α that the ultrasound wave that calculating ultrasound emission end sends produces in detection region_T

${\mathrm{\α}}_T=\frac{K\left(T\right)f^{n\left(T\right)}\mathrm{\η}\left(T\right)}{{\mathrm{\ρc}}^{m\left(T\right)}\left(T\right)}---\left(3\right)$

Wherein, in classical formulas, coefficientω=2 π f audiogram frequency, f is frequency of sound wave；η is for even Continuous phase viscosity；ρ continuous phase density；The c two-phase fluid velocity of sound, by sound path, (ultrasonic emitting end sends sound wave and receipts with the propagation time To the ratio calculation of the time difference t) of echo, i.e.N and m represents the index of f and c respectively, is affected by temperature T.N exists In classical formulas, value is 2, and m value in classical formulas is 3.Detect main reception sensor and receive signal and ultrasound emission end Send the transition time t of pumping signal, the parameters that separately sampled mensuration is relevant with temperature, calculate attenuation by absorption coefficient.? In oil-in-water flow pattern, biphase character is as shown in table 1.When f take 1MHz, T be 25 degrees Celsius time；η is 0.01 (Pa s)；It is 998 (kg·m^-3), at this moment

1 liang of phase parameter of table

Step 4: calculate and water-oil phase scattering parameter

$G=\frac{2k^2{R}^3}{3\mathrm{Re}\[A_0\]}---\left(4\right)$

Wherein, k is the wave number of ultrasound wave in continuous phase, i.e.Wherein,c₀For the velocity of sound in continuous phase；R is Discrete phase droplet radius, value is test discrete phase mean radius 1mm in the present invention.Re[A₀] represent take A₀Real part, parameter A₀ For discrete phase partial wave wave amplitude, by the ECAH model improved^[4]Solve, i.e. by equation

$\left[\begin{array}{c}{A}_0\\ {A_0}^{\′}\\ B_0\\ {B_0}^{\′}\end{array}\right]=-{{\[M\]}_{AH}}^{-1}\×\left[\begin{array}{c}{a}_c{j_n}^{\′}\left(a_c\right)\\ \mathrm{\η}\[({a_s}^2-2{a_c}^2)j_n\left(a_c\right)-2{a_c}^2{j_n}^{\′\′}\left(a_c\right)\]\\ b_c{j}_n\left(a_c\right)\\ \mathrm{\κ}{a}_c{b}_c{j_n}^{\′}\left(a_c\right)\end{array}\right]---\left(5\right)$

Try to achieve.Wherein,

$\begin{array}{c}{\[M\]}_{AH}\\ =\left[\begin{array}{cccc}{a}_c{h_n}^{\′}\left(a_c\right)& {a_c}^{\′}{j_n}^{\′}\left(a_c\right)& a_T{h_n}^{\′}\left(a_T\right)& {a_T}^{\′}{j_n}^{\′}\left({a_T}^{\′}\right)\\ \mathrm{\η}\left[\begin{array}{c}({a_s}^2-2{a_c}^2)h_n\left(a_c\right)\\ -2{a_c}^2{h_n}^{\′\′}\left(a_c\right)\end{array}\right]& \mathrm{\η}\left[\begin{array}{c}({a_s}^2-2{a_c}^{\′2})j_n\left({a_c}^{\′}\right)\\ -2{a_c}^{\′2}{j_n}^{\′\′}\left({a_c}^{\′}\right)\end{array}\right]& \mathrm{\η}\left[\begin{array}{c}({a_s}^2-2{a_T}^2)h_n\left(a_T\right)\\ -2{a_T}^2{h_n}^{\′\′}\left(a_T\right)\end{array}\right]& \mathrm{\η}\left[\begin{array}{c}({a_s}^2-2{a_T}^{\′2})j_n\left({a_T}^{\′}\right)\\ -2{a_T}^{\′2}{j_n}^{\′\′}\left({a_T}^{\′}\right)\end{array}\right]\\ b_c{h}_n\left(a_c\right)& {b_c}^{\′}{j}_n\left({a_c}^{\′}\right)& b_T{h}_n\left(a_T\right)& {b_T}^{\′}{j}_n\left({a_T}^{\′}\right)\\ {\mathrm{\κa}}_c{b}_c{h_n}^{\′}\left(a_c\right)& {\mathrm{\κ}}^{\′}{a_c}^{\′}{b_c}^{\′}{j_n}^{\′}\left({a_c}^{\′}\right)& {\mathrm{\κa}}_T{b}_T{h_n}^{\′}\left(a_T\right)& {\mathrm{\κ}}^{\′}{a_T}^{\′}{b_T}^{\′}{j_n}^{\′}\left({a_T}^{\′}\right)\end{array}\right]\end{array}---\left(6\right)$

Wherein, a_c, a_s, a_TIt is respectively taking advantage of of discrete phase radius and compressional wave wave number, shearing wave wave number and heat wave wave number Long-pending, η is continuous phase viscosity, and κ is continuous phase thermal conductivity, j_nFor Spherical Bessel function, i.e.h_nFor SphericalHankel function, i.e.Wherein, c_pFor continuous phase Quality specific heat at constant pressure, T₀For temperature, taking 25 degrees Celsius, β is ultrasonic wave number in two phase flowFormula is used slash Number " ' " parameter represent when calculating this, take the related physical coefficient of discrete phase material.Re[A₀] only with biphase character and surpassing It is relevant to time difference t receiving acoustic signals that acoustic emission end sends sound wave.In oil-in-water flow pattern, c₀For the velocity of sound in water 1497(m·s^-1)；R is that oil droplet radius is averaged 1mm, then

Step 5: under oil-in-water or Water-In-Oil water-oil phase model, total after two phase flow fluid matasomatism of ultrasound wave Decay is represented by:

α=α_R+α_T+α_D (7)

In formula: α_RDecay for ultrasonic scattering, α_TDecay for ULTRASONIC ABSORPTION, α_DFor ultrasonic diffusive attenuation.

By formula (1), (2), (3) are brought formula (7) into and can be obtained

$\mathrm{\α}=\frac{3{\mathrm{\φ}}_V}{2k^2{R}^3}\mathrm{Re}\[A_0\]+\frac{K\left(T\right)f^{n\left(T\right)}\mathrm{\η}\left(T\right)}{{\mathrm{\ρc}}^{m\left(T\right)}}+-\underset{n=3}{\overset{8}{\Σ}}\frac{ln(V_n/V_1)}{l}---\left(8\right)$

Arrangement can obtain two phase flow discrete phase content φ_VCalculation relational expression is

${\mathrm{\φ}}_V=G\·\[-\frac{ln(V_2/V_1)}{l}-\frac{K\left(T\right)f^{n\left(T\right)}\mathrm{\η}\left(T\right)}{{\mathrm{\ρc}}^{m\left(T\right)}}-a\·(-\underset{n=3}{\overset{8}{\Σ}}\frac{ln(V_n/V_1)}{l})\]+b$

I.e.

Wherein, a is border correction factor, and b is measurement model error parameter.

Multiple physical field emulation experiment calculates a border correction factor, in oil-in-water flow pattern, by boundary integral and 7, border The ratio receiving sensor sum is worth 1.2225.Actual tests corrects b measurement model error parameter, actual oil-in-water dynamic test Obtaining its value isBy the most each step acquired results, bring into based on ultrasonic attenuation mechanism model public Formula (9) obtains, in oil-in-water flow pattern, when f take 1MHz, T be 25 degrees Celsius time； ${\mathrm{\φ}}_V=\frac{2\×{10}^3}{3\mathrm{Re}\[A_0\]\×{1467}^2}\[-\frac{\ln \left(V_2/V_1\right)}{l}-\frac{4\×{10}^{-10}{\mathrm{\π}}^2{t}^3}{1497l^3}-1.2225\×\left(-\underset{n=3}{\overset{8}{\Σ}}\frac{\ln \left(V_n/V_1\right)}{l}\right)\]+\frac{1}{8}\left(-\frac{\ln \left(V_2/V_1\right)}{l}-3\right).$

The present invention only need to detect ultrasound emission end pumping signal V₁Sound pressure signal value V with each ultrasonic reception end₂, V₃……V₈, ultrasonic emitting end sends sound wave with time difference t receiving echo and distance l to solve phase content.

The present invention solves phase content as a example by the medium under uniform mixing condition, when fluidic structures is laminar flow, it is possible to make Calculate by the method.

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Feng Ruo.Handbookofultrasonic[M].Nanjing:N anjing University Press, 1990.(in Chinese)

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Feng Ruo.Sound chemistry and It’s application[M].Hefei:Anhui Science and Technology Press,1992.(in Chinese)

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[4]J.R.Allegra and S.A.Hawley,“Attenuation of Sound in Suspensions andEmulsions:Theory and Experiments,”J.Acoust.Soc.Am.,vol.51,pp.1545-1564, 1972。

Claims (2)

1. a water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model, the device used comprises ultrasonic Transducer, signal generating unit, exciting circuit unit, excitation and receiving transducer channel selection unit, testing circuit unit and stream Dynamic parameter calculation unit；Described ultrasonic transducer comprises signal emission sensor and receives sensor, receives sensor and divides again Being main reception sensor and auxiliary reception sensor, described signal emission sensor and main reception sensor straight line respectively is the most right It is arranged on bottom and the top of pipeline；Six auxiliary reception sensors are evenly distributed on signal emission sensor and main reception sensing The both sides of device；Described signal generating unit is connected with exciting circuit unit and acoustic pressure detector, and signal generating unit produces Pulse voltage signal, is encouraged signal emission sensor by exciting circuit unit, excitation and receiving transducer channel selecting Unit is connected with receiving sensor, it is achieved each receives sensor and receives signal respectively.Step is as follows:

Step 1: when in pipeline by detected fluid time, signal generating unit produce pulse signal, by exciting circuit unit to Signal emission sensor applies pumping signal, and the ultrasound wave with certain amplitude and frequency passes through tested region, arrives main reception Sensor and 6 assisting ultrasonic receive sensor, and the detection signal of each auxiliary reception sensor is by excitation and receiving transducer Channel selection unit gating receives sensor, is connected with testing circuit unit, and receiving circuit unit obtains receiving the electricity of sensor Pressure signal, is then fed into signal demodulation module, by signal is demodulated process；

Step 2: set the detection signal V of main reception sensor₂, 6 assisting ultrasonic receive the detection of sensor auxiliary reception sensor Signal is respectively V₃……V₈, calculate detection signal V₂, V₃……V₈With pumping signal V₁Ultrasound intensity decayIts In, l is signal emission sensor and the distance of main reception sensor, and n is 2,3 ... 8；

Step 3: total ultrasonic attenuation coefficient of oil-water two-phase flow fluid in calculating pipelineConnect with each assisting ultrasonic Receive the ultrasonic diffusive attenuation amount sum of sensor

Step 4: detect main reception sensor and receive signal and signal emission sensor sends the transition time t of pumping signal, Calculate attenuation by absorption amountWherein,F is frequency of sound wave；η is continuous phase viscosity；ρ is Continuous phase density, c is the two-phase fluid velocity of sound,N and m represents the index of f and c respectively, is affected by temperature T, and herein, n takes Value is 2, and m value is 3；

Step 5: calculate water-oil phase scattering parameterWherein, k is the wave number of ultrasound wave in continuous phase, i.e.Wherein,c₀For the velocity of sound in continuous phase；R is discrete phase droplet radius；Re[A₀] represent take A₀Real part, parameter A₀ For discrete phase partial wave wave amplitude；

Step 6: utilize multiple physical field emulation experiment to calculate a border correction factor, by the main reception sensing of boundary integral with border The ratio of device and 6 assisting ultrasonic reception sensor sums is worth 1.2225, and actual tests corrects b measurement model error parameter, and b isBring into based on ultrasonic attenuation mechanism model formulaCalculate each of oil-water two-phase flow Phase content.

Water-oil phase flow containing rate measuring method based on ultrasonic attenuation mechanism model the most according to claim 1, it is special Levy and be, for oil-in-water flow pattern, c₀For the velocity of sound in water 1497 (m s^-1)；R is oil droplet radius.