摘要
碟片式离心机内的流场难以直接测量,采用计算流体力学(CFD)技术可以更加直观地展现碟片式离心机内部流场特征。本文以DRS 230\4-00-99型碟片式离心机为研究对象,基于N-S方程和标准k-ε两方程湍流模型,利用Fluent流体动力学分析软件模拟了碟片间隙的内部流场。结果表明,模拟得出的速度分布和压力分布符合碟片式离心机的内部理论基本规律。液体在碟片间隙内存在旋转滞后现象,但由于碟片间隙较小,液体旋转滞后较小。说明碟片间隙小,不仅可以减小颗粒的沉降距离,有利于提高分离效率,同时还能减小液体滞后。模拟同时发现,等距离碟片间隙中液体流量及压力降呈现不均匀分布,离入口位置越近,碟片间隙中液体流量及压力降越大,在前三层尤为明显。这些发现为碟片式离心机两相分离的模拟研究提供了参考依据,对优化碟片式离心机的结构设计具有重要的指导意义。
Flow field in the disc centrifuge is difficult to measure directly. Computational fluid dynamics（CFD）technology can be used to show the internal flow field characteristics of a disc centrifuge more intuitively. Based on the N-S equation and the standard two equation k-ε turbulent model,Fluent was used to simulate the flow in a DRS 230／4-00-99 disc centrifuge,including three-dimensional velocity and pressure. Results showed that the simulation of velocity distribution and pressure distribution agreed with the theory of internal basic law of disc centrifuge,rotation of liquid between the discs existed hysteresis,which was small because of small gap in disc. The disc centrifuge not only reduced the sedimentation distance of particles,but also improved the separation,and reduced rotation of liquid hysteresis. At the same time,the liquid flow rate and pressure drop were not evenly distributed in equidistance disc gap. Near the entrance position,the flow rate and pressure drop were greater,particularly in the first three layers. These findings could provide the reference for two-phase flow simulation of the disc centrifuge and have an important guidance for the centrifuge structure optimization design.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2014年第6期1403-1407,共5页
Chemical Industry and Engineering Progress
关键词
碟片式离心机
离心分离
流场
数值模拟
disc centrifuge
centrifugation
flow
numerical simulation
