Multi-vision-based system and method for measuring gas-liquid two-phase flow phase fraction of small channel

Abstract

The invention discloses a multi-vision-based system and method for measuring gas-liquid two-phase flow phase fraction of a small channel. The system comprises a high-speed camera, two light sources, a right-angle prism, a small pipeline, a glycerinum groove and a computer. The method comprises the following steps: firstly, simultaneously obtaining gas-liquid two-phase flow flowing image sequences of the small channel from two vertical angles; secondly, carrying out image pretreatment and optical distortion correction and building phase fraction measurement models of four typical flow patterns, namely bubble flow, slug flow, annular flow and wavy flow; thirdly, extracting feature vectors of images and carrying out flow pattern identification; and finally, selecting the phase fraction measurement model of the corresponding flow pattern and calculating the phase fraction. By a multi-vision technology, the phase fraction measurement model is built for each typical flow pattern, the flow pattern information is introduced into the phase fraction measurement model, and thus the measurement accuracy is improved. The corresponding device has the advantages of simplicity in structure, non-contact measurement, visualization and the like.

Description

technical field [0001] The invention relates to the field of multiphase flow parameter measurement, in particular to a multi-vision-based small channel gas-liquid two-phase flow phase holdup measurement system and method. Background technique [0002] In recent years, with the rise of micro-processing technology and new material technology, industrial equipment has shown a trend of miniaturization and miniaturization. Due to the advantages of miniaturization and miniaturization equipment, such as high efficiency, rapidity, easy control and saving raw materials, it has been widely used in the fields of biology, medical treatment, chemical industry and pharmaceuticals. Therefore, the measurement of gas-liquid two-phase flow parameters in small channels has become a research hotspot and difficult problem. [0003] Compared with conventional channels, it is more difficult to measure gas-liquid two-phase flow parameters in small channels. At the microscale, due to the decrease ...

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Problems solved by technology

[0005] Aiming at the problem of insufficient information acquisition and insufficient accuracy of the existing small-channel gas-liquid two-phase flow phase holdup measurement method based on high-speed photography, the present invention proposes a method for small-channel gas-liquid two-phase flow through repeated research. A multi-vision-based small-channel gas-liquid two-phase flow phase holdup measurement system and method, using a multi-vision system to simultaneously acquire images of two mutually perpendicular angles of two-phase flow, perform image preprocessing and optical distortion correction, and establish four typical flows According to the phase holdup measurement model of the flow type, the eigenvectors are extracted for flow type identification, and the phase holdup measurement model of the corresponding flow type is selected to calculate the phase holdup

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