Rotation speed measurement of moving particles in a CFB riser

作     者：Xuecheng Wu Qinhui Wang Zhongyang Luo Mengxiang Fang Kefa Cen 

作者机构：State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou Zhejiang 310027 China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2009年第7卷第4期

页      面：238-244页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 081201[工学-计算机系统结构] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supports from the Special Funds for China Major State Basic Research Projects(Grant 2005CB221201) the National Natural Science Foundation Projects (Grant 50806067) the Program of Introducing Talents of Discipline to University (B08026) 

主　　题：Rotation speed measurement Moving particles Gas-solid flow Circulating fluidized bed (CFB) 

摘      要：This paper presents a study on measuring rotation speed of moving glass beads with an average diameter of 500 p.m in a pilot-scale circulating fluidized bed （CFB） riser with a high-speed digital imaging system. Two methods have been developed to calculate particle rotation speed from the particle images. The first method consists of a fully automated algorithm based on cross-correlation of gray distribution of particle images for particles whose rotation axes are （nearly） perpendicular to the imaging plane, and the second method calculates the speed of particle rotation by identifying its rotation axis using two or more characteristic points on its surface. The reliability of the two methods is verified by using a small sphere with known speed and direction of rotation. The first method is shown to be capable of measuring accurately the rotation speed for the particle with a rotation axis （nearly） perpendicular to the imaging plane and filtering off other particles using an appropriate threshold of correlation coefficient. The second method is shown to be capable of yielding both the speed and direction of particle rotation, with a measurement error of less than 10%. Results of both methods on real glass beads in a CFB riser are compared against each other.