Abstract
The flow field characteristic is vital to the design work and safety requirements of the pebble bed high temperature gas-cooled reactor (HTGR). It is necessary to study and analyze the particle location and velocity profile in pebble flow. A digital image processing (DIP) method is proposed to investigate the characteristics of particle motion, which contains two sections: mathematical morphology and threshold segmentation. These two theories are used to extract the particle position and binarize the particle image captured in the experiment, respectively. The post-processing of particle image can accurately obtain the center coordinates and velocity distribution of particles with the given time interval. Generally, the proposed algorithm can maintain a recognition accuracy of particles in pebble flow more than 90%. The calculation of particle velocity has shown that flow velocity in the middle region is much faster than in the near-wall region, and approximately forms a Gaussian distribution. The specific image processing and its conclusion can be used for dealing with relevant images and providing some reference for reactor design.
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