非球形颗粒在移动床中流动特性的离散单元法直接数值模拟

被引：6

作者：

陶贺

金保昇

钟文琪

机构：

[1] 东南大学能源与环境学院

来源：

中国电机工程学报 | 2010年 / 30卷 / 23期

关键词：

非球形颗粒; 移动床; 离散单元法; 流动特性;

D O I：

10.13334/j.0258-8013.pcsee.2010.23.013

中图分类号：

TK16 [燃料与燃烧];

学科分类号：

080702 ;

摘要：

采用多元颗粒模型对玉米形颗粒在移动床内的流动进行了离散单元法(discrete elementme thod,DEM)直接数值模拟。玉米形颗粒由4个叠加在一起的球元构成。讨论了玉米形颗粒的碰撞机制及运动过程中的受力情况,主要是碰撞力和重力。通过实验验证了模型的正确性。研究了移动床内的颗粒流动特性,分析了摩擦系数对壁面所受应力、颗粒空隙率及速度分布的影响。结果表明,摩擦系数越大,卸料所需时间越长,且在2种摩擦系数μ=0.24、0.44下,壁面都会产生过压力现象。空隙率随着摩擦系数的增大而增大;摩擦系数越小,水平方向上的速度分布越均匀,颗粒的流动越接近整体流。

引用

页码：78 / 83

页数：6

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