摘要
利用计算流体力学(CFD)对带稳定翼四斜叶-Rushton组合桨釜内流场进行数值模拟,分析了不同转速下釜内流型、速度场、湍动能的变化规律。研究结果表明:搅拌器转速显著影响釜内流场和湍动能的分布,转速N=110 r/min时,釜内流型为径向流,稳定翼的切割推流作用表现明显,在釜内组合桨中间区域形成了一个高速涡旋,釜内流型为最佳流型;在该转速条件下釜内低速区趋近消失,速度分布合理;此时釜内上部和釜底的湍动能分层消失,釜内流体整体湍动程度较高,混合效果明显增强。
Making use of CFD(computational fluid dynamics)simulate the flow field in a stirred tank equipped with the four-pitched blade-Rushton combined impeller with stabilizers was implemented to analyze the variation law of flow pattern,velocity field and turbulent kinetic energy in a stirred tank at different speeds.The results show that,the agitator speed significantly influences both flow field and turbulent kinetic energy distribution within the stirred tank;when the rotating speed N=110 r/min,the flow pattern is radial flow pattern in the stirred tank and the stabilizer has obvious effect of cutting and pushing fluid,and a high-speed vortex in the middle area of the combined impellers in a stirred tank forms together with an optimal flow pattern in the stirred tank.Under the condition of this speed,the low speed area in the stirred tank tends to disappear and the speed distribution is reasonable.At this time,the turbulent kinetic energy in the upper and bottom of the tank disappeared in layers and the overall turbulent degree of the fluid in the stirred tank was higher,and the mixing effect would be significantly enhanced.
作者
孙中宙
包健
高晓斌
秦晓波
周勇军
SUN Zhong-zhou;BAO Jian;GAO Xiao-bin;QIN Xiao-bo;ZHOU Yong-jun(College of Mechanical and Power Engineering,Nanjing Tech University;National Quality Inspection and Testing Center of Chemical Equipment(Jiangsu))
出处
《化工机械》
CAS
2023年第4期500-504,533,共6页
Chemical Engineering & Machinery
关键词
搅拌釜
带稳定翼四斜叶-Rushton组合桨
CFD模拟
转速
流场
stirred tank
four-pitched blade-Rushton combined impellers with stabilizers
CFD simulation
rotating speed
flow field
