铝电解槽磁流体的两相模拟及其界面追踪

Two-phase simulation and its interface tracking of fluid flow in aluminum electrolysis cell

采用商业软件ANSYS与CFX相结合的方法,运用有限元及有限体积法与两相流模型对300 kA铝电解槽导电磁流体的铝液、电解质两相湍流流动进行研究,并耦合VOF算法追踪铝液界面波动,模拟计算正常工况及角部换极下的稳态流场。研究结果表明:铝液流场基本呈现为2个大的漩涡,流场计算值与测试值比较接近;而在角部阳极更换后铝液中水平电流密度显著增大;在新阳极下方的铝液中形成较大速度涡旋,对流场的较大扰动导致界面波动幅度增加,极距减小;通过适当提升新极安装高度可增强磁流体的稳定性。

With the two commercial packages ANSYS and CFX, the electromagnetic driven flow field in the aluminum electrolysis cell was studied by finite element method and finite volume method. The flow field was simulated with the derived electromagnetic forces while two phase model and VOF method were employed to model the melt-bath mixture and its interface tracking. From the modeling it is shown that there are two vortexes in the liquid metal pad, and the disturbed horizontal current has significant effect on the magnetic field after comer anode changes and an eddy with larger velocity appears under the new anode while ACD decreases and magnetohydrodynamic instability increases.