孙永昌， 张 佩， 武煜坤， 陈 伟， 郑诚林， 徐止恒， 李政权

（江西理工大学江西省颗粒系统仿真与模拟重点实验室， 江西赣州341000）

DOI:10.13732/j.issn.1008-5548.2022.06.011

收稿日期： 2022-03-04， 修回日期：2022-09-01，在线出版时间：2022-11-01。

基金项目：国家自然科学基金项目，编号：52130001； 江西理工大学高层次人才科研启动项目，编号：JXXJBS17078。

第一作者简介：孙永昌（1997—），男，硕士研究生，研究方向为颗粒模拟技术。E-mail： s19801266030@163.com。

通信作者简介：李政权（1982—），男，副教授，博士，硕士生导师，研究方向为多相流仿真模拟。E-mail： qqzhengquan@163.com。

摘要：为了提高无挡板立式搅拌釜的混合性能，应用自主开发的离散元软件研究颗粒的粒径、密度以及颗粒间的摩擦系数对搅拌釜混合性能的影响，采用接触数法评价颗粒的混合度并结合颗粒的空间合角速度来分析颗粒的混合效果。结果表明：颗粒的粒径对混合性能影响较小，4种不同粒径组合的混合度均在0.25～0.45之间；而2种颗粒的密度差越大，混合度越小，颗粒密度一致时混合度最大；混合度随着颗粒间的摩擦系数的增大先增大后减小，当摩擦系数为0.54时，混合度最大，接近0.5。

关键词：搅拌釜；物料参数；混合性能；数值模拟；离散元法

Abstract：In order to improve the mixing performance of the vertical stirred tank without baffles, the effects of particle size, density and friction coefficient between particles on the mixing performance of the stirred tank were studied by using the self-developed discrete element method software. The mixing degree of particles was evaluated by the contact number method and the mixing performance of particles was analyzed by combining the angular velocity of particles. The results show that the particle size has little effect on the mixing performance, and the mixing degree of the four particle combinations with different particle sizes is all between 0.25～0.45. The larger the density difference between the two kinds of particles, the smaller the mixing degree is. The mixing degree is the largest when the particle density is the same. The mixing degree increases firstly and then decreases with the increase of the friction coefficient between particles. When the friction coefficient reaches 0.54, the mixing degree is the highest, which is closed to 0.5.

Keywords：agitator; material parameter; mixing performance; numerical simulation; discrete element method

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