双条横稳电磁制动板坯结晶器内钢液流动与传热及凝固耦合的数值模拟

Coupled Modeling of Fluid Flow,Heat Transfer and Solidification of Molten Steel in a Casting Mold with Double Horizontally Stabilized Electromagnetic Brakes

建立了板坯连铸结晶器内流动、传热和凝固耦合的数学模型,分析了在有无电磁制动下,结晶器内钢液流动、温度分布及凝固坯壳厚度的变化情况.结果表明,在电磁制动的作用下,从浸入式水口流出的钢液速度得到了抑制,引入电磁场能减小射流冲击深度,有利于稳定和减少钢液面波动和促进凝固坯壳的生长,拉速为1.1m/min时,结晶器出口处凝固坯壳厚度增加约2mm.

A three-dimensional model of liquid steel flow,temperature and solidification in a slab casting mold with magnetic induction is presented in FLUENT and magneto-hydrodynamics（MHD）.The model is applied to investigate the effects of flow and heat transfer in the mold with and without electromagnetic brakes（EMB）,their strength is measured at a steel plant.The results show that free face velocity and penetration depth of liquid steel can be decreased under a constant EMB strength.Electromagnetic forces can be controlled to stabilize the fluid flow in the mold cavity,and shell thickness of slab mold exit position increase 2 mm compared with the mold without EMB.