水口浸入深度与拉坯速度对电磁制动下板坯结晶器内金属流动的影响  

EFFECTS OF NOZZLE SUBMERGED DEPTH AND CASTING VELOCITY ON LIQUID METAL FLOW WITH EMBr IN CONTINUOUS CASTING OF SLAB

作　　者：贾皓[1] 王敏[1] 张振强[1] 邓康[1] 雷作胜[1] 任忠鸣[1] 

机构地区：[1]上海大学上海现代冶金与材料制备重点实验室,上海200072

出　　处：《上海金属》2012年第1期53-57,62,共6页Shanghai Metals

基　　金：国家自然科学基金课题(No.50674066)

摘　　要：以水银为实验工质,通过物理模拟考察板坯连铸电磁制动时,水口浸入深度和拉坯速度对结晶器内液态金属流动的影响规律。采用超声波多普勒测速仪测量了在结晶器上部磁场B1=0.18 T和下部磁场B2=0.5 T的情况下,板坯结晶器(模型)内水银的流速分布。实验表明:(1)加大水口浸入深度整体上使液面水平流速下降,且提高该流动的稳定性(湍流度降低);而当水口浸入深度过深时,会引起液面水平流向改变。(2)水口出流的射流流速及其对结晶器窄面的撞击强度,以及液面的水平流速与其湍流度依然随拉坯速度提高而增强;同时,结晶器窄面附近上、下回流区金属液的铅垂速度均趋增大,且上回流区金属液对窄面冲刷的相对强度表现为先升高后降低,而下回流区金属液对窄面冲刷的相对强度则呈持续增强趋势。A mercury model was developed to investigate the influences of SEN depth and casting velocity on the metal flow in slab continuous casting mold with electromagnetic braking （EMBr）. The velocity in mold with the upper part of magnetic field B1 =0.18 T and the lower part of magnetic field B2 = 0.5 T was measured by ultrasonic Doppler velocimeter. The results showed that ： （1） the level velocity near the meniscus decreased and the flow stability improved （the decreased turbulence intensity） with the SEN depth increasing on the whole; when the SEN depth was too deep, the meniscus flow direction was changed, （2） the velocity, the impact strength of the jet as well as the level velocity and the turbulence intensity near the meniscus decreased with the increasing of casting velocity. At the same time, the vertical velocity of the metal flow in the upper and lower eddy increased, and the washing intensity of metal flow in the upper eddy increased at first and then decreased. But the washing intensity in the lower eddy increased.

关 键 词：板坯连铸 结晶器 电磁制动 物理模拟 

分 类 号：TF777[冶金工程—钢铁冶金]