项目名称: 电磁搅拌连铸中液态金属流动与传热特性及其对凝固过程的影响
项目编号: No.11302155
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 数理科学和化学
项目作者: 危卫
作者单位: 武汉理工大学
项目金额: 23万元
中文摘要: 电磁搅拌连铸过程涉及流体流动、传热、传质及相变等诸多物理和力学问题,是一个非常复杂的冶金过程,其中电磁场、流场和温度场相互耦合。弄清电磁搅拌作用下钢液的流动和传热特性,对于合理控制磁场强度和过热度等操作参数具有重要意义。本项目采取物理建模、数值模拟及实验研究相结合的方法,完善描述磁场、流场与温度场相互耦合的多物理场计算模型,建立能准确描述复杂几何形状中钢液流动特征的大涡模拟湍流模型和描述传热特性的传热模型,从而实现对中间包和结晶器内的流场与温度场的合理调控。对流场与温度场调控的效果最终反映在所形成的凝固组织的微观结构上,开展钢液的凝固实验,与数值模拟结果结合,探讨钢液流动与传热的宏观特性对凝固过程中的晶粒细化的影响,为制造均质化与细晶化的连铸坯提供理论成果。
中文关键词: 多物理场耦合;界面波动;颗粒动力学特性;;
英文摘要: Electromagnetic stirring continuous casting process is a very complex metallurgical process involving fluid flow, heat transfer, mass transfer, phase change, and many other physical and mechanical problems. The electromagnetic field, flow field and temperature field are coupled with each other. It is significant to clarify the fluid flow and heat transfer characteristics of steel liquid for the reasonable control of the magnetic field strength, the degree of superheat and other operating parameters in electromagnetic stirring continuous casting. Taking a combination of physical modeling, numerical simulation and experimental study in this project, the multi-physics model to describe the coupling of the magnetic field, flow field, and temperature field is improved; the turbulence model which can accurately describe the flow characteristics of steel liquid in complex geometry is proposed; the heat transfer model which can accurately describe thermal characteristics is also proposed. Using the simulation results, the reasonable regulation of the flow field and temperature field in the tundish and mold is achieved. The effect of regulation is ultimately reflected in the microstructure organization formed by the solidification, by carrying solidification experiments of steel liquid, and then combined with numerical s
英文关键词: Multi-physics coupling;Interface fluctuation;particulate mechanical behavior;;