Abstract： To study the inner flow mechanism of powder materials in the material hopper, a simulation model was established by the particle discrete element method. The particle flow code in three-dimension was used to simulate the accumulation process of material hopper during discharging powder material flow. The process of powder materials flow in the hopper was observed. The unbalanced force and speed of change of a single particle in the process of flow accumulation were recorded. The static and dynamic pressure changes of hopper wall and particles were measured. The results show that the particle velocity in hopper outlet fluctuates significantly. The micro unbalanced force and contact stress between particles increases significantly near the hopper outlet. The pressure on hopper side wall is bigger at the initial time. The particles in hopper center take the lead out during the macro flow process.

Keywords: powder; hopper; discrete element method; particle flow code; numerical simulation

中图分类号：TQ022         文献标志码：A

文章编号：1008-5548(2015)02-0001-04

DOI:10.13732/j.issn.1008-5548.2015.02.001

收稿日期：2014-04-29， 修回日期：2014-05-14，在线出版时间：2015-04-17。

基金项目：国家自然科学基金项目，编号：51265001；甘肃省高等学校科研项目，编号：2013A-058；甘肃农业大学“伏羲青年英才培养计划”项目，编号：FXYC20130103；中国博士后科学基金项目，编号：2014M562471。

第一作者简介：王国华（1989—），男，硕士研究生，研究方向为农产品加工机械。 电话：15002652197，E-mail：wghuade@163.com。

通信作者简介：张克平（1981—），男，博士，副教授，研究方向为农产品加工机械及摩擦磨损研究。 E-mail：zhangkp@gsau.edu.cn。