基于DPM-CFD的旋风除尘器内部流场数值分析

Numerical analysis of flow field in a cyclone dust separator based on DPM-CFD

采用离散相模型对旋风除尘器内部气固两相流场的分布特性进行数值模拟分析。模拟结果表明:粉尘颗粒的运动具有很强的随机性,上尘环和局部涡流始终存在,在除尘器圆筒壁面和中心管之间的区域以及中心管底部下方的区域都形成了环形的纵向涡流,中心管底部下方区域和中心管的进口区域湍动能和湍动能耗散率最大,中心管长度是影响旋风除尘器内部流场的一个重要参数。此外,对中心管的长度做了最优化设计,为旋风除尘器的结构优化设计和重点研究方向提供了借鉴和依据。

The discrete phase model（DPM）was used to simulate the distribution characteristics of gas-solid two-phase flow field in a cyclone dust separator.The simulation results showed：the movement of the dust particles had strong randomicity;top dust-ring and the local eddy current always existed;annular longitudinal vortex flow was formed in the area between the center pipe and the cylinder wall and the area below the bottom of the center pipe;there were the largest turbulent kinetic energy and turbulent kinetic energy dissipation rate in the area below the bottom of the center pipe and the inlet of the center pipe;the length of the center pipe was one of the important parameters affecting the flow field in the cyclone dust separator.In addition,the length of the center pipe was optimized.The study offered reference and basis for the structural optimization and key research direction of the cyclone dust separator.