电渣重熔过程渣池磁流体力学行为数值模拟

建立了耦合电渣重熔过程渣池内电磁场、温度场和流场的数学模型，在考虑渣池内电磁力和热浮力对熔渣流动影响的基础上，分析了电渣重熔工艺(电极形貌、插入深度和电流强度)对渣池磁流体力学行为的影响规律.结果表明:当电磁力为主时，渣池内存在逆时针涡流；当热浮力为主时，渣池内存在顺时针涡流.电渣重熔电流5kA，频率50Hz，电极端部为平面时，渣池内同时存在逆时针和顺时针涡流，最大流速为005m/s；当电极端部为锥形时，渣池内部只存在顺时针涡流，最大流速为020m/s..增加电极插入深度和增大电流强度都会增强渣池内逆时针涡流；相反，则增强渣池内顺时针涡流.

Numerical Simulation of Magnetohydrodynamic Behavior of ESR Slag

A coupled model for the magnetic field， temperature field and fluid flow field of electroslag remelting (ESR) was developed. Considering electromagnetic force and thermal buoyancy force effects on the fluid flow in slag pool， the effects of practice parameters (electrode tip shape， immersion depth， and current density) on the magnetohydrodynamic behavior of ESR slag were investigated. The results showed that the anti clockwise circulation pattern is generated in slag pool when electromagnetic force is dominated， and the clockwise circulation pattern is generated in slag pool when buoyancy force is dominated. When current density and current frequency are 5000A and 50Hz， respectively， the anti clockwise vortex and clockwise vortex are coexisted in slag pool for the electrode tip with flat shape， but only clockwise vortex is existed in slag pool for the electrode tip with conical shape. The maximum velocities of molten slag are 005m/s and 020m/s for the electrode tip with flat shape and conical shape， respectively. Increasing immersion depth and current density can enhance anti clockwise vortex in slag pool. On the contrary， the clockwise vortex in slag pool is enhanced.