HUO Feng,CHANG Ying,LU Xiaoxia,LIU Yingli,LI Cong,BAO Shaoheng

(State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China)

Abstract:Based on the background of hazardous chemicals decontamination,the research on the centrifugal compression loading process of the powder-decontamination-agent was conducted.Spherical silica particles were selected as the analog media,and based on discrete element method (DEM),simulations of the centrifugal compression process of the powder particles were carried out.The height of the powder column before and after compression was compared and analyzed,and the density distribution law of the powder column at different stages was studied.The influence of particle size on density distribution and the change of powder density with time were further analyzed.The results show that the height values of the powder column before and after the centrifugal compression calculated by the DEM simulation agree well with the experimental results,and the deviation is not greater than 5.82%.The density distribution regularities after the centrifugal compression are obviously different from that after the hydraulic compression.After the centrifugal compression,the distribution of compacted powder particles density is axisymmetric,the density of powder particles in the lower middle part near the bottom is largest,and the overall density decreases gradually toward the barrel wall.The change trend of particle density per unit volume increases rapidly with the compression time,and then tends to a fixed value.Reducing the particle size or adding some smaller particles appropriately are able to help increase the total density of powder column and make the density distribution more uniform.

Keywords:powder particles;centrifugal compression;discrete element method;density of compression

中图分类号： O347.7                            文献标志码：A

文章编号：1008-5548(2022)02-0034-10

DOI:10.13732/j.issn.1008-5548.2022.02.005

收稿日期： 2021-10-09，修回日期：2021-10-19，在线出版时间：2022-01-30。

基金项目：国民核生化灾害防护国家重点实验室科研基金项目，编号：SKLNBC2020-16。

第一作者简介：霍枫(1996—)，男，硕士研究生，研究方向为特种粉体包装技术。E-mail：h7uofeng@163.com。

通信作者简介：常颖(1971—)，女，高级工程师，博士，硕士生导师，研究方向为特种粉体包装技术。E-mail：chying01@sina.com。