基于DEM-CFD的立式搅拌磨机耦合仿真方法及实验研究  

Coupling Simulation Method and Experiment of Vertical Stirring Mill Based on DEM−CFD

作　　者：瞿铁 马立峰[2] 宋现洲 王朝华 张升奇 赵炎龙 纪昊男 QU Tie;MA Lifeng;SONG Xianzhou;WANG Zhaohua;ZHANG Shengqi;ZHAO Yanlong;JI Haonan(CITIC Heavy Industries Co.,Ltd.,Luoyang 471039,Henan,China;College of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,Shanxi,China;Luoyang Mining Machinery Engineering Design Institute Co.,Ltd.,Luoyang 471039,Henan,China)

机构地区：[1]中信重工机械股份有限公司,河南洛阳471039 [2]太原科技大学机械工程学院,山西太原030024 [3]洛阳矿山机械工程设计研究院有限责任公司,河南洛阳471039

出　　处：《矿产保护与利用》2025年第1期15-22,共8页Conservation and Utilization of Mineral Resources

基　　金：山西省科技创新人才团队专项计划(202204051002002)。

摘　　要：针对立式搅拌磨机筒体内部存在螺旋搅拌器、研磨介质球、矿浆等复杂的多相物质耦合运动,开展基于DEM-CFD的耦合仿真方法及实验研究。首先,基于立式搅拌磨机工作原理,采用离散元方法(DEM)和流体动力学(CFD)分别模拟颗粒相和流体相,建立筒体内部流固耦合理论模型;其次,建立实验样机简化模型,研究介质球DEM模型、矿浆流体域CFD模型和DEM-CFD耦合模型的构建方法及参数;然后,通过实验验证不同仿真模型的准确性。结果表明,DEM-CFD仿真结果比DEM模型更接近实验值,DEM-CFD仿真得到的搅拌器扭矩与实验扭矩存在5.43%的偏差,而DEM模型存在8.14%的偏差。通过对比筒体内部介质球速度、碰撞次数及搅拌器扭矩发现:矿浆作为流体域对立式搅拌磨筒体内部的介质球运动存在显著影响,其浮力和黏性降低了介质球的速度和碰撞次数,相反增加了螺旋搅拌器的扭矩。A coupling simulation method and experiment based on DEM−CFD were investigated to address the complex multi−phase coupling motion of spiral agitators,grinding media,and slurry inside the cylinder of a vertical stirring mill.Firstly,based on the working principle,the Discrete Element Method(DEM)was used to simulate the particle phase and Computational Fluid Dynamics(CFD)to simulate the fluid phase,respectively.A theoretical model of fluid−solid coupling inside the cylinder was constructed.Secondly,a simplified model of the experimental prototype was established,and the construction methods and parameters of the grinding sphere(DEM),slurry(CFD),and DEM−CFD coupling model were investigated,respectively.Then,the accuracy of different simulation models was verified by experiments.The results showed that the DEM−CFD simulation results were closer to the experimental values than DEM,there was a deviation of 5.43%between the torque obtained from DEM−CFD model and the experimental torque,while the DEM model had a deviation of 8.14%.By comparing the velocity,collision frequency,and agitator torque of the grinding spheres inside the cylinder,it was found that the slurry as a fluid domain had a significant impact on the movement of the grinding spheres.Its buoyancy and viscosity characteristics reduced the velocity and collision frequency,whereas it increased the torque of the spiral agitator.

关 键 词：立式搅拌磨 DEM-CFD 离散元分析 流固耦合 介质球速度 碰撞次数 

分 类 号：TD453[矿业工程—矿山机电]