双辊铸轧铸嘴内部铝液流动的三维数值仿真

3-D numerical simulation of molten aluminum flow in feed tip nozzles of twin roll-casting

针对在常规铸轧条件下结构型式完全不同的2种铸嘴,根据实际工况,分别应用层流模型和低雷诺数的k-ε湍流模型,用商业软件CFX(version4.2)对铝液在其内部的流动进行了三维数值仿真。研究结果表明:对于应用层流模型的铸嘴结构,其内部铝液流动的仿真结果与水模实验结果基本一致;对于应用低雷诺数的湍流模型的铸嘴结构,其内部铝液流动的仿真结果能较好地为铸嘴结构及参数的改进提供依据。尽管2种铸嘴结构的差异很大,铸嘴入口处的流动状态不同,分别处于层流和湍流的状态,但铸嘴出口处沿铸轧方向的流速分布规律在铸嘴宽度和高度方向非常相似。

3-D numerical simulation of molten aluminum flow in feed tip nozzles of two completely different configuration feed tips used in conventional roll-casting condition was performed by using commercial, general purpose code CFX （version 4.2）. For one feed tip, the laminar flow model should be applied and the simulation results are in agreement very well with the results of the water model of this feed tip. For the other feed tip, the low Reynolds number k-ε turbulence model should be applied and the numerical simulation results can provide foundation for improving the configuration and parameters of feed tips. Though the configurations of these two feed tips are greatly different and the flow fields at the entrance of them are completely different （one is laminar flow and the other is turbulence flow）, the flow at the exit of them are very similar, especially for the distribution of velocity components parallel to the roll-casting direction both across the feed tip width and along the height.