摘要
在旋转坐标系下 ,采用k-ε湍流模型模拟了两个时间瞬间六直叶涡轮搅拌槽内流体流动状态 ,模型成功地再现了六直叶涡轮搅拌槽内“双循环”流动形式 .模拟结果表明当桨叶离底距离C/T =0 .16 7时 ,槽体内流动从径向流动转化为轴向流动 .模拟计算搅拌功率准数及桨叶排出流量准数与实验结果相差很小 ,数值模拟速度分布与实验测量结果吻合较好 ,且预测速度数值明显优于“黑箱”
Two sets of instantaneous flow fields generated by a Rushton turbine are simulated in the rotating reference coordinate based on standard k-Ε turbulent model. The model predictions successfully reproduce the two circulation loop flow pattern in a Rushton turbine stirred tank. The simulation results also show that the radial flow pattern is transferred to axial flow pattern at C/T=0.167. The model prediction power number (Np) and the impeller flow number (Nqd) are in good agreement with the experimental data. The model prediction velocity distributions of this study agree with experimental measurements, and are in closer agreement with the experimental data than those based on block box method.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2001年第3期241-246,共6页
CIESC Journal
基金
国家自然科学基金资助项目 !(No .2 94762 2 2 )&&
