摘要
在考虑速度粘性耗散项的情况下建立了方坯连铸三维稳态流动传热耦合数学模型,模型中对二冷区传热边界条件的处理与以往模型相比更加准确。应用该模型和早前基于有效导热系数方法所建立的方坯连铸二维非稳态有效导热系数模型对涟钢1号ROKOP方坯连铸机(150×150mm2)连铸过程中拉坯方向上一定区域内的流动与传热现象分别进行了数值仿真,计算结果对比分析得出,在仿真运算所选取的钢液对流较强的计算域内,三维耦合模型能更为准确地预测出铸坯的温度场。另外,通过两种数学模型对铸机整个冶金长度范围内的凝固过程进行了复合数值模拟并设计出了相应的二冷方案。连铸机的生产实践表明,二冷设计方案非常合理,连铸过程的数值仿真结果具有较好的可靠性和实用性。
On consideration of the velocity-viscosity-damping term, a three dimensional stable conjugated fluid flow and heat transfer mathematical model of billet continuous casting has been developed. By contrast with the previous models, it抯 more accurate in dealing with the thermal boundary condition of secondary cooling zone in the present model. According to 1# ROKOP billet continuous caster (billet format: 150mm2) of Lianyuan steel plant, the fluid flow & heat transfer phenomenon in some extent along casting direction during continuous casting process has been numerically simulated with the present 3D coupled model and the previous 2D unstable heat conduction model based on effective thermal conductivity respectively. Comparing of calculated results shows that the temperature profile of billet can be predicted more accurately by present 3D coupled model in the selected domain where convection of steel liquid prevails. In addition, a hybrid numerical simulation of solidification process over the whole metallurgical length of caster has been executed with the two mathematical models and a relevant secondary cooling scheme has been worked out. By the casting practice, the secondary cooling scheme proves highly rational and the numerical simulation acquisition has preferable reliability and practicability.
出处
《系统仿真学报》
CAS
CSCD
2004年第8期1665-1669,共5页
Journal of System Simulation
基金
重庆市科委应用基金资助项目(6784)
关键词
方坯连铸
三维流动传热耦合数值仿真
速度粘性耗散项
二冷区传热边界条件
billet continuous casting
3D numerical simulation of conjugated fluid flow & heat transfer
Velocity- viscosity- damping term
thermal boundary condition
