Flow Control and Non-contact Support of Conductive Fluid by Electromagnetic Force

通过数值模拟和实验，我们研究了各种磁场配置，它们可以实现更精确和更高效的导电流体的传输和支持，如钢水。数值模拟：利用本课题组开发的可同时处理电磁场和流体力学问题的二维模拟程序，分析了钢液电磁输运的基本特征。为了考虑在导电流体中施加电磁力所必需的三维现象，将二维流动模拟程序扩展为三维流动模拟程序，并介绍了商用三维电磁场分析软件，利用该软件得到了三维电磁驱动流动。此外，还对具有两种不同行波场的电磁传动的特性进行了计算，得到了基本的…结果与二维程序得到的结果更接近。实验：为了测量电磁力驱动下的金属熔体流动，观察液体表面，并将结果与模拟结果进行比较，搭建了一个小型实验系统。该系统由产生线性行场的线圈系统、电磁流速传感器及其放大器、温度控制系统和变频电源组成。伍德的金属被用作电磁力驱动的熔融金属。研究了两种情况：只有一个行波场和两个反向行波场的组合。结果表明，两个行波场的组合可以有效地改变流动方向，抑制引起杂质的自由面变形。这与仿真结果吻合较好。此外，还成功地在流速传感器放大器中引入了积分电路，以减小感应电场对传感器的影响。较少

By numerical simulation and experiments we have investigated various magnetic field configurations that can achieve more precise and more efficient transport and support of conductive fluids such as molten steel.1. Numerical simulation : Using a two-dimensional simulation program developed by our group, which can deal with problems coupled with both electromagnetic field and fluid mechanics, fundamental characteristics of electromagnetic transport of molten steel were analyzed. To consider three-dimensional phenomena essential in application of electromagnetic force to conductive fluid, the two-dimensional flow simulation program has been extended to a three-dimensional version and a commercial three-dimensional electromagnetic field analysis software has been introduced, with which three-dimensional electromagnetically driven flow was obtained. In addition, the characteristics of an electromagnetic drive with two different traveling fields were calculated and the results were fundamen … More tally similar to those obtained with the two-dimensional programs.2. Experiment : To measure molten metal flow driven by an electromagnetic force, observing the liquid surface, and also comparing these results with simulation results, a small experimental system was constructed. The system consists of a coil system generating a linear traveling field, an electromagnetic flow velocity sensor and its amplifier, a temperature control system, and a variable frequency power supply. Wood's metal was used as a molten metal driven by an electromagnetic force. Two cases were investigated : only one traveling field and the combination of two fields traveling in opposite directions. The results show that the combination of two traveling fields can change the flow direction effectively and suppress the free surface deformation that cause impurities. This agrees well with simulation results. In addition, an integral circuit was successfully introduced into the flow velocity sensor amplifier to reduce the influence of the induction field on the sensor. Less