摘要
采用CFD商用软件模拟了搅拌加喷吹情况下溶池中流场和相的分布.对比分析了水模型内单相流和两相流时液面和轴向迹线图、矢量图和相分布图,重点考察了中心搅拌和偏向搅拌对漩涡和相分布的影响规律.模拟结果表明,中心搅拌模式下在搅拌桨轴附近形成很大的漩涡,偏心时虽然也有漩涡形成,但偏离轴心.两相流偏心搅拌模式下由于漩涡较小且偏离轴心,有利于气体的分散;偏心搅拌与中心搅拌相比可以抑制漩涡在几何中心的形成,有利于气体的分散和气泡的细化,同时偏心搅拌也可以有效地抑制水模底部的死区.研究结果对喷气机械搅拌装置的设计具有参考价值.
The aim of this work was to investigate the flow field and distribution of phases in a mechanical stirrer with and without gas injection. So CFD software was used to simulate the vortex formation and phase distribution of cold water model based on the similar principle. Single-phase and two-phase flows were both simulated and analyzed under centric and eccentric stirring modes. From these simulation results it was conclude that big vortex could form near impeller shaft in centric stirring mode, although vortex still existed in eccentric stirring, but the vortex deviated from shaft, and this mode could inhibit bubble accumulation. The simulation results of two-phase flow under mechanical stirring showed that under eccentric stirring mode, because vortex was smaller and deviated from shaft, this mode was beneficial to bubble dispersion. Gas distribution at the bottom of cold water model in eccentric stirring was better than that in centric stirring mode, which was beneficial to design of gas injecting mechanical stirrer.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第S1期400-404,共5页
The Chinese Journal of Process Engineering
基金
国家973计划资助项目(编号:2007CB613504)
辽宁省青年人才基金资助项目(编号:2005221012)
教育部高校博士点专项基金资助项目(编号:20050145029)
关键词
CFD
数值模拟
搅拌槽
水模型
computational fluid dynamics
numerical simulation
stirred tank
water model
