基于DPM模型的立磨局部流场数值模拟分析

Numerical simulation of local flow field in the vertical roller mill base on DPM model

采用CFD理论中的离散相模型(DPM模型)和雷诺应力方程涡粘模型(RSM模型)对立磨内复杂的气固两相流流场的分布特性进行数值模拟分析。分别从速度、温度、压强等两相流的流场讨论分析立磨磨腔内的气固相的相互耦合作用。研究表明,立磨磨腔流场是一个剧烈的三维旋转湍流流场,流场呈现出不对称性和强烈的湍流脉动性。通过对磨辊磨盘耦合区、选粉机中心回料锥筒处强烈的湍涡现象的模拟分析,为合理设计立磨壳体、喷嘴环、中心回料锥筒等结构,提供理论依据。

The discrete phase model （DPM） and the Reynolds stress equation eddy viscosity model （RSM） of the computational fluid dynamics（CFD） theory were used to simulate the distribution characteristics of complex gas-solid two-phase flow field in the vertical roller mill. The interaction effect between the gas-solid twophase flow was discussed and analyzed in view of velocity, temperature, pressure field,etc. The results indicate that there is severe rotational turbulent flow field in the vertical roller mill chamber and the flow field is asymmetry and strong turbulent pulsation. By the simulation for turbulent flow and vortex phenomenon of table-roller region and separator center cone, the research provides a theoretical basis for the structure design of the mill casing,nozzle ring and separator center cone.