Effects of annulus gap on flow and temperature field in electromagnetic direct chill casting process  

环缝结构对电磁连铸流场和温度场的影响(英文)

作　　者：汤孟欧[1] 徐骏[1] 张志峰[1] 白月龙[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第5期1123-1129,共7页中国有色金属学报（英文版）

基　　金：Project (2009AA03Z534) supported by the Hi-tech Research and Development Program of China; Project (2006CB605203) supported by National Basic Research Program of China

摘　　要：A comprehensive mathematical model of annulus-electromagnetic direct chill （A-EMDC） casting of A357 aluminum alloy was established with corresponding experimental verification. The model was based on a combination of the commercial finite element package ANSYS and the commercial finite volume package FLUENT. The effects of structural parameters on fluid flow, temperature field and solidification during A-EMDC process were investigated numerically. The results show that structural parameters such as annulus gap width, annulus gap position, and centre pipe length influence the flow and temperature fields. The smaller the annulus gap width is, the more uniform the temperature is, and the smaller the temperature gradient is. With increasing the centre pipe length, the circular flow would decrease due to the dislocation of centre pipe. Specially, when the annulus gap is located at periphery of the billet, the temperature gradient of the longitudinal direction in the solidification region falls evidently.建立描述环缝式电磁连铸A357铝合金圆坯过程的数学模型,采用有限元法求解电磁场,采用有限体积法求解流场和温度场,并对电磁场和温度场的计算结果进行实验验证,分析环缝宽度、环缝位置和芯棒长度等结构参数对环缝式电磁连铸过程流场、温度场和凝固过程的影响。结果表明:环缝宽度越小,液穴中的温度梯度越小,温度场越均匀;随着芯棒长度的增加,由于芯棒的错位液穴内的循环流减小,温度梯度变大;当环缝位于铸坯边沿时,液穴中的温度梯度降低明显。

关 键 词：electromagnetic stirring continuous casting coupled modeling annulus gap 

分 类 号：TG249.7[金属学及工艺—铸造]