碟式离心机碟片间薄层两相流分析  

Separation Law of Thin Layer Two-phase Flow between Disc in Disc Centrifuge

作　　者：袁惠新[1,2] 张宇恒 付双成 朱杭[1,2] 缪文婧 Yuan Huixin;Zhang Yuheng;Fu Shuangcheng;Zhu Hang;Miao Wenjing(School of Mechanical Engineering,Changzhou University,Changzhou 213016,China;Jiangsu Key Laboratory of Green Process Equipment,Changzhou 213016,China)

机构地区：[1]常州大学机械工程学院,江苏常州213016 [2]江苏省绿色过程装备重点实验室,江苏常州213016

出　　处：《流体机械》2019年第12期27-32,61,共7页Fluid Machinery

基　　金：国家自然科学基金项目(21676031);科技部科技型中小企业创业基金项目(08C26213200648);重点研发计划项目(YGB2018011)

摘　　要：针对离心力场下薄层流场内的两相沉降过程,以多相流理论为基础,以CFD模拟研究碟式离心机碟片间隙内流场及多组碟片间薄层流场的三维流动模型。结果表明,多层碟片间的进料量自下往上逐层增大,碟片间薄层流场内物料的相对沉降速度由中性孔向端口逐步增大;靠近碟片外端口物料流动具有相对滞后性,定距筋条间区域的物料流动超前于碟片旋转运动;中性孔内重相体积分布不均,中性孔内上端重相体积分布最大;碟片间薄层流场内重相体积分布不均且轻重相分界面较为明显。研究结果发现,高转速下离心机转鼓内能够形成明显的轻重相分界面,有效地分离非均相混合物。Based on the multi-phase flow theory,aiming at the two-phase sedimentation process in the thin-layer flow field under the centrifugal force field,the three-dimensional flow field model of the flow field in the disc gap and the thin-layer flow field between the multiple discs is established.The results show that the feed amount between the multi-layer discs increases from bottom to top,and the relative sedimentation velocity of the material in the thin layer flow field between the discs gradually increases from the neutral hole to the port;the material flow near the outer port of the disc has relative hysteresis,and the material flow in the area between the fixed ribs is ahead of the rotary motion of the disc;the volume distribution of the heavy phase in the neutral pore is uneven,the volume distribution of the heavy phase in the upper end of the neutral pore is the largest;the volume distribution of the heavy phase in the thin layer flow field between the discs is uneven and the interface between the light and heavy phases is obvious.The results show that a high light-weight phase interface can be formed in the centrifuge drum at high rotation speed,effectively separating the heterogeneous mixture.

关 键 词：碟式离心机 薄层流场 离心沉降 数值模拟 轻重相分界面 

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