摘要
研究不同螺旋叶片结构对卧螺离心机内部流场分布特性与分离性能的影响。应用计算流体力学软件Fluent,基于多相流Mixture模型和雷诺应力模型,对卧螺离心机应用中的常规螺旋、镂空式螺旋和间断式螺旋进行三维数值模拟,通过数值模拟的方法,得到不同螺旋叶片对卧螺离心机分离性能的影响。计算结果表明:常规螺旋脱水与排渣排液过程稳定,分离性能满足要求;镂空式螺旋对流场破坏很大,清液无法从镂空通道排出,镂空式螺旋固相回收率与出渣含固率皆低于常规螺旋;间断式螺旋对轴向速度分布较合理,间断式螺旋分离性能与常规螺旋相似,改变间隔距离对固相分布的影响较小。
To study the influence of different helical blade structures on the flow field distribution and separation performance of Decanter Centrifuges,by using the computational fluid dynamics software Fluent and based on the Mixture model and Reynolds stress model,the three dimensional numerical simulation of the conventional screw,the hollow screw and the intermittent screw in the application of the horizontal screw centrifuge was carried out.The calculation results show that the conventional spiral dewatering and slag discharge process is stable and the separation performance meets the requirements;the hollow spiral destroys the flow field greatly,and the clear liquid cannot be discharged from the hollow passage;the solid recovery rate and solid content of the hollow spiral are lower than those of the conventional spiral;the axial velocity distribution of the intermittent spiral is more reasonable,and the separation performance of the intermittent spiral is similar to that of the conventional spiral.Interval distance has little effect on solid phase distribution.
作者
付双成
张亚磊
姜毓圣
袁惠新
FU Shuangcheng;ZHANG Yalei;JIANG Yusheng;YUAN Huixin(School of Mechanical Engineering,Changzhou University,Changzhou 213164,China;Jiangsu Key Laboratory of Green Process Equipment,Changzhou University,Changzhou,213164,China)
出处
《常州大学学报（自然科学版）》
CAS
2020年第1期56-61,共6页
Journal of Changzhou University：Natural Science Edition
基金
国家自然科学基金资助项目(21676031)
关键词
卧螺离心机
螺旋
分离
数值模拟
decanter centrifuge
spiral
separation
numerical simulation
