Optical detection system and method for phase distribution of gas-liquid two-phase flow in small pipeline

Abstract

The invention discloses a small pipeline gas-liquid two-phase flow phase distribution optical detection system and method. The method comprises the following steps: firstly, irradiating a measured gas-liquid two-phase flow from two mutually vertical directions by adopting two sheet-shaped light beams, and synchronously measuring light intensity distribution generated by the measured gas-liquid two-phase flow; then, in combination with light intensity distribution data when the pipeline is filled with the liquid phase, extracting required light intensity distribution characteristic quantity from a measurement result; secondly, establishing a measurement model about small pipeline section phase distribution parameters and light intensity distribution characteristic quantity based on a geometrical optics principle, and realizing gas-liquid phase distribution measurement of the pipe section by utilizing experimental data; and finally, further realizing gas-liquid phase distribution reconstruction and liquid film thickness estimation of the gas-liquid two-phase flow based on multiple groups of phase distribution measurement results. The system has the advantages of non-contact / non-invasive measurement, high time / space resolution, simple device structure and the like; and the method is based on the geometrical optics principle, and an effective and convenient new way is provided forobtaining the section gas-liquid phase distribution information of the gas-liquid two-phase flow of the small pipeline.

Description

technical field [0001] The invention belongs to the technical field of two-phase flow fluid detection, and relates to a small pipeline gas-liquid two-phase flow phase distribution optical detection system and method. Background technique [0002] Gas-liquid two-phase flow in small pipes widely exists in the fields of energy, petroleum, and chemical industry. The phase distribution detection research for this flow process is of great value in the field of scientific research and industrial application. Because this technology can not only provide an effective data source for scientific research and theoretical modeling, but also provide support and guarantee for the safe and efficient operation of industrial production. [0003] In the existing gas-liquid two-phase flow phase distribution detection technology, high-speed camera method and particle tracer method are two types of methods that have been successfully applied to small channel gas-liquid two-phase flow detection. A...

AI Technical Summary

Problems solved by technology

Although this technology can obtain high-precision two-phase flow images and has the advantages of non-invasive and non-contact detection, high-speed cameras need to obtain fluid images under the condition of transparent pipelines, which is difficult to achieve in many application scenarios of

Also, the high cost of the high-speed cameras themselves is a limiting factor for the technology

For the particle tracking method, although high-quality gas-liquid two-phase flow interface shape information can be obtained by using this method, and more accurate flow field distribution information can be obtained, but the limitations of this type of technology are: on the one hand, the detection The corresponding equipment in the system, such as high-energy pulsed lasers and high-speed cameras, are very expensive, and the structure of the device is relatively complicated; on the other hand, this type of technology needs to add tracer particles to the original fluid, which may affect the working fluid. physical properties

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