一种新型下排气旋风分离器的数值模拟  

Numerical simulation of a new type of cyclone with down exhaust outlet

作　　者：张蕾蕾 陈延信[1] 赵博[1] 党敏辉 姚艳飞[1] ZHANG Leilei;CHEN Yanxin;ZHAO Bo;DANG Minhui;YAO Yanfei(College of Materials Science and Engineering,XIAN University of architecture and technology,Xi'an 710055,China;Shaanxi Coal Chemical Industry Technology Research Institute 710070,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]陕西煤业化工技术研究院,西安710070

出　　处：《流体机械》2021年第10期50-58,共9页Fluid Machinery

基　　金：国家重点计划研发项目(2016YFB0303400)。

摘　　要：为了研究新型下排气旋风分离器的流场分布规律,借助ANSYS FLUENT软件采用RSM和DPM对其进行气固两相流动数值模拟。在试验数据验证数值模拟结果准确性的基础上,对比分析了不同入口风速10,15,20,25,30 m/s下新型下排气旋风分离器不同截面上(Z=20,180,350,400,500,700 mm)的压力场、速度场。研究发现:新型旋风分离器内部流场为单旋流,相对于常规旋风分离器气流流程短,压降低;不同截面上流场差异大,排气管部位存在二次涡现象;锥部为偏离几何中心的旋转气流,筒部区域流场呈现高度的轴对称分布;径向流动整体较弱,对流场的影响不大;入口风速与压降呈正相关关系;新型下排气旋风分离器对细颗粒的分离效率较高,当颗粒粒径小于5μm时,分离效率随着入口风速的增大而增大,对于粒径大于5μm的颗粒,分离效率随着入口风速的增加先增大后降低,在入口风速为25 m/s时达到最大。In order to study the flow field distribution law of a new type of cyclone with down exhaust outlet,the gas-solid two-phase flow was simulated numerically using RSM and DPM in ANSYS fluent software.Based on the accuracy of the numerical simulation results verified by the test data,the pressure and velocity fields of the new type down-exhaust cyclone at different cross-sections(Z=20,180,350,400,500 and 700 mm)at different inlet wind speeds of 10,15,20,25 and 30 m/s were compared and analyzed.The results show that the inner flow field of the new type cyclone is a single swirl,its airflow process is shorter than that of the conventional cyclone,and the pressure drop is low;The flow fields are different greatly in different sections,and there is the phenomenon of secondary eddy current in the exhaust pipe;The cone is a rotating airflow deviating from the geometric center,and the flow field in the cylinder region is highly axisymmetrically distributed;The radial flow is weak as a whole and has little effect on the flow field;There is a positive correlation between the inlet wind speed and the pressure drop;The new type down exhaust cyclone has a higher separation efficiency for fine particles.When the particle size is less than 5μm,the separation efficiency increases with the increase of inlet air speed,for the particle size greater than 5μm,the separation efficiency first increases with the increase of inlet air speed and then decreases,and reaches the maximum at the inlet air speed of 25 m/s.

关 键 词：旋风分离器 数值模拟 流场 分离效率 压降 

分 类 号：TH138.8[机械工程—机械制造及自动化] TQ051.8[化学工程]