Coupled electromechanical and electrothermal problems in continuous casting

本课题研究的是用于超优质钢连铸的下一代电磁搅拌设备的设计与开发。这将需要开发一个复杂的数学模型，因为拟议的设备没有，也不可能完全存在于实验室规模上。拟议中的设备将由多个高功率线圈组成，旨在产生旋转磁场，与高速钢水相互作用，高速钢水被连续倒入水冷的开底铜模具中。磁场的目的是对钢水施加力，使其在模具内部和下面旋转。熔融金属的运动，特别是沿着固/液凝固前沿的运动，将显著提高凝固产品的质量。这个特定的建模目标是具有挑战性的，因为它包含了来自广泛不同领域的最先进的方法。具体来说，电磁场是三维的，以复杂的方式随时间变化，并且被熔融金属的运动所修改。此外，铸造系统中熔融金属的流动是高度湍流的，容易产生脉动，导致铸模中钢液的自由表面不稳定。本研究的首要目标是了解、描述和电磁控制流动脉动，从而稳定钢液的自由表面。第二个目标是发展电磁手段，以增加某些关键区域的湍流量，从而显著提高凝固钢的质量。

This research is concerned with the design and development of next-generation electromagnetic stirring equipment for the continuous casting of very high quality steel. This will require the development of a sophisticated mathematical model since the proposed equipment does not, and cannot, completely exist on the laboratory scale. The proposed equipment will consist of multiple, high power, coils designed to produce a rotating magnetic field that interacts with high velocity molten steel that is continuously poured into a water cooled, open bottom, copper mold. The purpose of the magnetic field is to exert forces on the molten steel and cause it to rotate within and below the mold. The motion of the molten metal, particularly along the solid/liquid solidification front, will act to significantly improve the quality of the solidified product. This specific modeling goal is challenging in that it encompasses state-of-the-art methodologies taken from widely disparate fields Specifically, the electromagnetic fields are 3-dimensional, time varying in a complex fashion, and are modified by the motion of the molten metal. Additionally, the flow of the molten metal in the casting system is highly turbulent and prone to pulsations that cause instabilities at the free surface of the molten steel in the casting mold. The first objective of this research is to understand, describe and electromagnetically control the flow pulsations so that the molten steel free surface can be stabilized. The second objective is to develop electromagnetic means of increasing the amount of turbulence in certain critical regions such that the quality of the solidified steel will be significantly improved.