薄板连铸结晶器内流动和液面波动行为的数值模拟

Numerical Simulation on Behavior of Liquid Steel Flow and Fluctuation in the Thin Slab Continuous Casting Mold with EMBR

利用ANSYS CFX软件模拟研究了两种不同情况下(考虑和忽略液面变形)薄板坯电磁制动结晶器内的流动和液面波动行为,分析讨论了两种模拟条件下,磁感应强度和磁体位置对结晶器内的金属射流行为和液面波动行为的不同影响,以及拉速和液面波动指数对液面波动的影响。结果表明,当不考虑液面变形时,液面速度分布呈"抛物线"分布,弯月面最大波高靠近水口;而考虑液面变形和波动后的钢/渣界面速度有明显的峰值变化,钢/渣界面最大波高靠近结晶器窄面。通过两种情况的模拟结果,发现在合理的工艺参数下,考虑液面变形和波动的模拟结果更有实际意义。

By utilizing ANSYS CFX software,two kinds of different states（considering or not the liquid surface deformation）were simulated numerically for behavior of liquid level fluctuation in thin slab continuous casting mould with EMBR,and influences of magnetic flux density and magnetic position on the behaviors of metal jet and liquid level fluctuation were analyzed,meanwhile,effects of casting speed and variation law of level fluctuation index（F）on the behavior of liquid level fluctuation were described.The results indicate that,for different shape of free surface calculation models,with ignoring the surface deformation,the distribution of free surface velocity has a characteristics of the parabolic distribution,and maximum wave height of the meniscus is positioned at near the nozzle,while considering surface deformation,the velocity of steel/slag interface exhibits an obvious peak change,and maximum wave height of the steel/slag interface is located at near the narrow side of mould.By comparing the simulated results of the two situations under different processing parameters,under the reasonable parameter conditions,the simulation results of considering surface deformation and wave are more available.