板坯连铸电磁制动下结晶器内金属流场的研究  

Study on Flow Field of Molten Steel in Slab Continuous Casting Mold with EMBr

作　　者：贾皓[1] 张振强[1] 吴吉文[1] 常同旭[1] 邓康[1] 任忠鸣[1] 

机构地区：[1]上海大学上海市现代冶金与材料制备重点实验室,上海200072

出　　处：《过程工程学报》2012年第5期721-727,共7页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50674066)

摘　　要：以水银为实验工质,通过物理模拟实验研究电磁制动下,板坯结晶器内钢水流动规律.实验通过超声多普勒测速仪获取不同电磁制动方式[单条型电磁制动(EMBr-Ruler)和流动控制结晶器(FC Mold)]、水口浸入深度和结晶器宽度下的液流特征.结果表明,在EMBr-Ruler或FCMoldII电磁制动下,结晶器窄壁处形成"液流通道",不利于结晶器内快速形成向下的活塞流.水口出口距下区磁场越近或被磁场所覆盖,则通道效应减弱;结晶器宽度增大,亦可降低该通道内液流的冲击效果.FC MoldⅡ下,液面流速和湍流度比EMBr-Ruler时低[液面水平流速最大值分别为0.155(Case1)和0.134m/s(Case2)],且加大水口浸入深度,可降低液流撞击结晶器窄壁的水平流速[其最大值0.071(Case2)和0.068m/s(Case3)].结晶器宽度的变化不改变水口浸入深度对结晶器流场的影响规律.A physical model was developed with mercury to describe steel flow in a slab continuous casting mold with electromagnetic brake （EMBr）. The velocity in it was measured by an ultrasonic Doppler velocimeter with different types of EMBr, immersion depths of submerged entry nozzle and mold widths. Variation of the jet, surface and vertical flows （near the narrow wall） with the EMBr process and slab continuous casting was studied. The results indicate that the ＂flow passage＂ formed near the narrow wall, which was unfavorable for the development of plug-like flow with EMBr; channel effect decreased when the ports approached to the down pair of magnetic poles or were covered by magnetic field; The impacting effect of ＂flow passage＂ decreased with increasing of the mold width; the velocity and turbulent intensity of surface flow were lower with flow control mold II than those with electromagnetic mold brake ruler [the maximum horizontal velocity of surface flow： 0.071 （Case 2） and 0.068 m/s （Case 3）], and increasing the immersion depth made the velocity impinging the narrow wall decrease [the maximum horizontal velocity： 0.071 （Case 2） and 0.068 m/s （Case 3）]. Variation of the mold width would not change the influencing rule of change of the immersion depth on the flow field in the mold.

关 键 词：板坯连铸 结晶器 电磁制动 金属流动 物理模拟 

分 类 号：TF777.1[冶金工程—钢铁冶金]