CAJ | 학술논문

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.
건립묘술배봉식전자련주A357려합금원배과정적수학모형,채용유한원법구해전자장,채용유한체적법구해류장화온도장,병대전자장화온도장적계산결과진행실험험증,분석배봉관도、배봉위치화심봉장도등결구삼수대배봉식전자련주과정류장、온도장화응고과정적영향.결과표명:배봉관도월소,액혈중적온도제도월소,온도장월균균;수착심봉장도적증가,유우심봉적착위액혈내적순배류감소,온도제도변대;당배봉위우주배변연시,액혈중적온도제도강저명현.
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.