Ultrasonic echo measuring method for two-phase flow phase volume fraction
A technology of ultrasonic echo and measurement method, which is applied in the direction of liquid/fluid solid measurement, measurement device, and material analysis using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems of measurement error and achieve convenient installation, low cost and space occupation little effect
Active Publication Date: 2016-11-23
TIANJIN UNIV
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Problems solved by technology
This method is more accurate only when the medium interface is a plane. However, in actual measurement, due to the effect of surface tension, the liquid interface is often in the shape of a curved surface, resulting in measurement errors.
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[0040] The specific implementation method is as follows:
[0041] 1) Carry out a calibration experiment on the pipeline. Under this condition, it can be considered that the gas-water interface on the cross-section is a plane, and the attached figure 1Drain the water inside the pipeline shown and block the two openings. Use a syringe with a readable capacity to inject water into the pipeline. A measurement is performed every time a certain volume of water is injected, and a set of echo intensity changes with the height of the interface is obtained. Its law conforms to formula (4) under the condition of the present invention. At the same time, a group of cross-sectional gas holdup data on the change of the interface height is obtained, which conforms to formula (3) under the conditions of the present invention.
[0042] 2) Install the pipeline on the measuring device to carry out the actual measurement. At this time, the air-water interface of the cross-section is generally a c...
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The invention relates to an ultrasonic echo measuring method for two-phase flow phase volume fraction. The method is used for measuring process parameters of two-phase flow flowing through a pipeline to be measured, an ultrasonic sensor using a single ultrasonic probe is arranged at the bottom end of the pipeline to be measured and does not make contact with a medium to be measured, an ultrasonic signal generating and detecting unit is achieved on the same ultrasonic probe, and the transmitting and receiving states of the ultrasonic probe are switched through two single-pole double-throw switches; the switch combination can control collecting the time sequence of transmitting signals and echo signals at the same time; strong reflection generated when ultrasonic waves pass through a medium interface with huge acoustic impedance difference is used for obtaining the position of the two-phase flow interface, the ultrasonic intensity attenuation rate is combined, gas-liquid interface curvature is compensated, the accurate two-phase flow phase volume fraction is calculated, and the measurement accuracy can be promoted.
Description
technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a test method for measuring the phase holdup of a gas-liquid two-phase flow by using an ultrasonic echo method, which can realize accurate acquisition of the phase holdup of the two-phase flow. technical background [0002] The phenomenon of two-phase flow widely exists in petroleum, chemical and pharmaceutical industries. The parameter measurement of two-phase flow is more complicated than that of unidirectional flow because of the interaction between phases. However, the accurate measurement of two-phase flow parameters is very important for improving production and production safety. As a key parameter of two-phase flow, phase holdup can be obtained by various methods, and the most commonly used methods are electrical method and ultrasonic method. [0003] Ultrasonic is more and more widely used in liquid level measurement, metal flaw detection and fluid measurement....
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Patent Timeline
Login to View More IPC IPC(8): G01F23/296G01N29/024G01N29/032
CPCG01F23/2962G01F23/2965G01N29/024G01N29/032G01N2291/011G01N2291/015G01N2291/101
Inventor 谭超辛子为董峰
Owner TIANJIN UNIV