径向进气式涡流空气分级机的流场特性与颗粒分级性能数值模拟  

Numerical simulation of the flow field characteristics and particle classification performance of a radial intake vortex air classifier

作　　者：梁延玺 吴健懋 朱继元 李先瑄 LIANG YanXi;WU JianMao;ZHU JiYuan;LI XianXuan(Key Laboratory of Advanced Manufacturing and Automation Technology,Education Department of Guangxi Zhuang Autonomous Region;Guangxi Engineering Research Center of Intelligent Rubber Equipment,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]桂林理工大学广西高校先进制造与自动化技术重点实验室,桂林541006 [2]桂林理工大学广西智能橡胶装备工程研究中心,桂林541006

出　　处：《北京化工大学学报（自然科学版）》2024年第3期122-130,共9页Journal of Beijing University of Chemical Technology(Natural Science Edition)

摘　　要：设计了一种径向进气式涡流空气分级机,采用Fluent软件对分级机内流场进行了数值模拟,探讨了转笼转速、进气速度和进气位置对流场的影响。结果表明:气流在分级腔体内并不是垂直上升,而是以一定倾斜角度在腔体内形成环形气流,环形气流方向与转笼转向相同;分级腔内气流为两个方向的双流层,主气流方向与转笼转向保持一致;随着转笼转速的增加,气流主体的方向不变,腔体左侧的对冲气流消失,腔体内形成的环形气流增强,但转笼下侧的二次涡流增大;不同进气速度对分级腔及转笼不同区域的切向速度具有不同的影响;进气位置的不同,分级腔内气流的流动相差较大,进气口位于转笼轴线同侧时的气流较进气口位于转笼轴线两侧时的气流更容易受到转笼的影响,进气位置对转笼周围流场分布的影响较小。采用响应面法对空气分级机的操作参数进行了优化,各参数对分割粒径影响的大小顺序为:转笼转速>进料速度>进气速度,优化的参数为转笼转速4483 r/min、进气速度15.6 m/s、进料速度9.71 kg/h,在该条件下分割粒径的预测值为40.5μm。A radial intake vortex air classifier has been designed,and the flow field in the classifier was numerically simulated using Fluent software.The effects of varying the rotation speed,inlet velocity and inlet position on the flow field were investigated.The results show that the airflow does not rise vertically in the grading chamber but forms an annular airflow in the chamber at a certain inclination angle,and the direction of the annular airflow is the same as that of the rotating cage.The airflow in the grading chamber is a double-stream layer in two directions,and the main airflow direction is consistent with the rotation of the rotating cage.With the increase of the rotating speed of the rotating cage,the direction of the main body of the airflow remains unchanged,the counterflow on the left side of the cavity disappears,and the annular airflow formed in the cavity is enhanced,but the secondary vortex on the lower side of the rotating cage increases.Different inlet velocities have varying effects on the tangential velocities in different regions of the grading chamber and the rotating cage.The airflow in the grading chamber varies significantly with the different inlet positions.When the air inlet is located on the same side of the rotating cage axis,the airflow is more markedly affected by the rotating cage than when the air inlet is located on both sides of the rotating cage axis,whereas the air inlet position has little effect on the flow field distribution around the rotating cage.The response surface method was used to optimize the operating parameters of the air classifier.The order of the influence of each parameter on the segmented particle size is:rotating speed of the cage>feed rate>inlet velocity.The optimized parameters are as follows:a rotation speed of the cage of 4483 r/min,an inlet velocity of 15.6 m/s,and a feed rate of 9.71 kg/h.Under these conditions,the predicted value of the segmented particle size is 40.5μm.

关 键 词：分级机 数值模拟 粉体 流场 流体力学 分级性能 

分 类 号：TQ051.8[化学工程]