Measuring device of dense two-phase flow particle speed and concentration spatial distribution

Abstract

The invention discloses a measuring device of dense two-phase flow particle speed and concentration spatial distribution. The invention is characterized in that: the device comprises an image acquisition terminal and an image processing unit (8); the image acquisition terminal is used for shooting a motion video of a particle (2) in a fluidization apparatus (1), and the image acquisition terminal comprises a laser source (9), a fiber endoscope (3), a high speed industrial camera (4), an image acquisition card (6) and a computer (7); a sheet-shaped laser beam (10) is provided by the laser source (9) to determine a measurement area in the fluidization apparatus (1); the fiber endoscope (3) shoots the determined measurement area as an optical lens, a lens of the fiber endoscope (3) is parallel with a plane of the laser beam (10), and a distance between the lens and the laser beam (10) is maintained at 10 mm. According to the invention, since the fiber endoscope is used as the optical lens, multi-angle measurement in a flow field is conveniently realized, and a difficulty that a motion parameter of the particle in a dense phase flow field can not be obtained is overcome.

Description

technical field [0001] The invention provides a measuring device for the velocity and concentration spatial distribution of moving particles in a dense two-phase flow field, which is especially suitable for measuring the velocity and concentration spatial distribution of dense phase particles in a gas-solid spouted bed, and belongs to the field of multiphase flow measurement . Background technique [0002] The spatial distribution of velocity and concentration of two-phase flow is the key parameter for analyzing the fluid dynamics in two-phase flow, and it is the premise for understanding the heat transfer and mass transfer mechanism between two-phase fluids in fluidization devices. Design and optimization of structural parameters are of great significance. [0003] At present, there are many methods to measure particle velocity and concentration in two-phase flow field. The traditional measurement methods include impact force method, constant velocity sampling method, heat...

AI Technical Summary

Problems solved by technology

Traditional two-phase flow measurement methods have low measurement accuracy, and the repeatability and reliability of measurement results are not ideal; modern measurement methods are widely used in the field of two-phase flow measurement due to their high spatial and temporal resolution, but the existing measurement The method has only been successfully promoted in the measurement of dilute phase flow. For example, there are PIV velocimeters on the market, but there is still no breakthrough in the measurement of dense phase, especially the measurement of particle velocity and concentration spatial distribution in the dense phase flow field. Progress

Due to the limitation of dense two-phase flow measurement technology, there is little research and understanding of the complex flow mechanism inside fluidized devices such as spouted fluidized beds, which leads to obstacles in the scale-up and application of fluidized equipment in industrial production.

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