电磁制动对CSP结晶器内流动和传热的影响

采用数值模拟方法,通过计算1 500 mm×90 mm CSP漏斗型结晶器内磁场、流场和温度场分布,研究了CSP漏斗型结晶器采用不同浸入式水口条件下电磁制动对钢液流动和传热行为的影响.研究结果表明,施加电磁制动后,采用牛鼻子水口的结晶器内流股冲击深度变小,自由液面最大速度从0.231 m/s降至0.067 m/s;采用双侧孔水口的结晶器内钢液主流股向上弯曲的趋势消失,流股对结晶器窄侧壁的冲击强度减弱,结晶器上部回流钢液速度减小,自由液面最大速度从0.798 m/s降到0.140 m/s.综合比较采用两种水口时电磁制动对钢液流动和传热行为的影响,采用双侧孔水口时制动效果较好,有利于提高铸坯质量.

Influences of EMBr on Flow and Heat Transfer in CSP Mold

The magnetic field， flow field and temperature field in the CSP funnel type mold with a size of 1500mm×90mm were calculated by numerical simulation， and the influences of electromagnetic brake(EMBr) on the behavior of flow and heat transfer of molten steel with different submerged entry nozzle(SEN) in the CSP mold were researched. The results show that the impinging depth of steel jet is shortened in the mold with cow-nose nozzle when the EMBr is employed， and the maximum velocity in the free surface is decreased from 0.231m/s to 0.067m/s. The upswept trend of liquid steel mainstream disappears under the influence of EMBr when the bifurcated nozzle is adopted. The impinging strength of steel jet on the narrow side of mold is weakened. The velocity of molten steel in the upper circumfluence is reduced. The maximum velocity in the free surface decreases from 0.798m/s to 0.140m/s. Comparing synthetically the influences of EMBr on the behavior of fluid flow and heat transfer with the two kinds of SEN， the braking effect is better under the condition of bifurcated nozzle， and the quality of thin slab is improved.