工业规模电渣重熔过程电磁场的数值模拟

建立了考虑集肤效应的工业规模电渣重熔过程电磁场数学模型,利用FLUENT对磁场强度实部和虚部的传输方程进行求解.分析了工频下电渣重熔过程电磁场的分布特征,并研究了电流频率和电极插入深度对电磁场的影响规律.结果表明:电流频率从0.5 Hz增加到60 Hz时,电极表面的电流密度从91 378 A/m~2增大到190 746 A/m~2;增大电流频率使磁场强度分布主要集中在电极和铸锭表面区域,渣金界面的洛伦兹力方向也会发生改变;在同功率条件下,增加电极的插入深度使远离电极端部的渣池区域中焦耳热密度增大,而电极端部附近渣池的焦耳热密度减小.

Numerical Simulation of Electromagnetic Field of Industrial Scale Electroslag Remelting Process

A mathematical model is established to investigate the electromagnetic field phenomena in an industrial-scale electroslag remelting process， the coupled real and imaginary scalar equations of magnetic field intensity are simultaneously solved with FLUENT software. The distribution characteristics of electromagnetic field with 50Hz have been analyzed， and the effects of current frequency and electrode penetration depth on electromagnetic field are also investigated. The results indicate that the current density increases from 91 378A/m² to 190 746A/m² when the current frequency varies from 0.5Hz to 60Hz. The magnetic field intensity concentrates in the region adjacent to the surface of electrode and ingot with the current frequency increasing. In addition， it also results in the alteration of the direction of Lorentz force at the slag-pool interface. Under the condition of the same power input， the Joule heating density in slag far from the electrode tip increases with the electrode penetration depth， however， it decreases at the region adjacent to the electrode tip.