钢包水口偏心率对浇注过程影响的数学模拟

 钢包的水口偏心率会显著影响浇注末期汇流旋涡的形成和发展过程。基于钢包特征设置合理的水口偏心率,有利于控制旋涡形态、抑制旋涡的危害。但是偏心率的变化如何改变流场,对浇注过程产生哪些影响,目前的研究并不充分。通过数值模拟方法,研究了水口偏心率对钢包流场和旋涡的影响规律,同时定义了“影响度”指标,定量分析了偏心率对浇注过程中表征流场和旋涡特性的14个物理量(如水口流量、旋涡角速度、湍动能、水口含气率等)的影响程度。结果表明,水口偏心率和各物理量之间存在非线性关系;不同物理量变化的临界点不同,普遍为0.5~0.7,旋涡的稳定性和容器壁面是影响临界点的主要因素。

Mathematical simulation of effect of nozzle eccentricity on ladle teeming process

The nozzle eccentricity plays a significant role in the formation and development of the sink vortex at the end of ladle teeming. An optimized nozzle eccentricity based on the characteristics of a ladle can help to control the shape of a vortex, thus suppressing its harmful effects. However, relative research, especially on the details of how the nozzle eccentricity influences the flow field and the teeming process of a ladle, is still limited. A numerical simulation method was employed to study the flow field and the teeming process. "Influence degree" was proposed and used to quantitatively analyze the influence of nozzle eccentricity on fourteen physical parameters of the flow field and the teeming process, including nozzle flow rate, vortex angular velocity, turbulent kinetic energy, and nozzle gas content. The results show that there is a nonlinear relationship between the nozzle eccentricity and these physical parameters; the critical points of these physical parameters are different, ranging from 0.5 to 0.7; and the vortex stability and the inner surface of the container are two main influence factors of the critical point.