Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method

A gas-liquid two-phase flow and phase distribution technology, which is applied in the direction of using optical devices, material analysis by optical means, measuring devices, etc., can solve problems such as difficulty in implementation, high cost, and affecting the physical properties of working fluids.

Active Publication Date: 2020-06-19
ZHEJIANG UNIV
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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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  • Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method
  • Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method
  • Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method

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Embodiment Construction

[0053] The system and invention of the present invention will be further described below in conjunction with the drawings.

[0054] Such as figure 1 As shown, a small pipeline gas-liquid two-phase flow phase distribution optical detection system consists of laser 1, beam expander 2, slit 3, beam splitter 4, first flat mirror 5, second flat mirror 6, and first high-speed CMOS sensor 7. The second high-speed CMOS sensor 8 and a small pipe gas-liquid two-phase flow 9 are composed. First, the beam emitted by the laser 1 passes through the beam expander 2 and the slit 3 and becomes a parallel sheet beam with a suitable width, which is the same width as the outer diameter of the pipe under test; then, the original parallel sheet beam passes through the beam splitter 4 It is divided into two horizontal and vertical sheet beams. The horizontal beam directly enters the small pipe gas-liquid two-phase flow 9, and the vertical sheet beam is reflected by the first plane mirror 5 and the seco...

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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 pipelines widely exists in the fields of energy, petroleum and chemical industry. The phase distribution detection research for this flow process has extremely important value in the field of scientific research and industrial application. Because this technology can not only provide effective data sources 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, the high-speed imaging method and the particle tracing method are two types of methods that have been successfully applied to the detection of small-channel gas-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/85G01N21/59G01B11/06
CPCG01B11/0616G01N21/59G01N21/85G01N2021/8405
Inventor 冀海峰戴振韬王保良黄志尧李海青
Owner ZHEJIANG UNIV
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