颗粒物质分选过程中的速度和角度分布的测量与研究

受颗粒体系混合熵的启发，搭建了基于面阵CCD相机的测量装置，通过金字塔分层光流算法与图像法对均值粒径分别为2.6 mm和1.25 mm的球形颗粒所组成的颗粒系统的分选过程开展了一系列测量，计算得到颗粒体系表面流动层的平均速度与倾斜角，得到如下结论：颗粒体系的总体熵可以描述颗粒分选过程中的细微变化；颗粒体系表面流动层的平均速度受倾斜角的影响，两者表现出正比例关系；在混合颗粒的运动状态为连续雪崩的转速范围内，颗粒体系的总体熵、表面流动层平均速度和倾斜角的变化趋势相一致，说明可以借助平均速度和倾斜角来辅助判断颗粒体系的分选程度。

Measurement of velocity and angle distribution in particle separation process

Inspired by the mixing entropy of the particle system, a measuring device based on the plane array CCD camera was built in order to carry out a series of measurements for the particle system composed of spherical particles with mean particle sizes of 2.6 mm and 1.25 mm respectively. The average speed and the angle of slope on the surface of the particle system were calculated through the pyramid-layered optical flow algorithm and the image method. The following conclusions are drawn. The subtle changes in the particle separation process can be described by the total entropy of the particle system. The average velocity of the flow layer on the surface of the particle system is affected by the angle of slope, and those two show a direct proportional relationship. Within the rotation speed range where the movement state of mixed particles is continuous avalanche, the global entropy of particle system, the average velocity of surface flow layer and the angle of slope have similar trend, indicating that the separation degree of particle system can be judged by the aid of the average speed and the angle of slope.