为了抑制钢包出钢末期出现的漩涡卷渣现象,进而提高钢液的洁净度和钢材质量,从对漩涡形成影响较大的水口偏心率入手,通过数值模拟和水模型实验,重点分析了不同偏心率条件下漩涡的运动过程和速度场的变化规律。研究发现,通过改变出钢过程中漩涡形成时的速度场分布形式和速度值的大小,可以改变漩涡的运动轨迹和趋势,进而降低漩涡的临界高度,有效抑制漩涡的形成。在此基础上,设计出底部吹气的防漩方法,得到最佳的吹气流量和吹气孔位置。

With the developments of science and technology, the performance of steel is required strictly and the quality of steel needs to improve continuously. In continuous casting process, there is an important flow phenomenon when the molten steel flows from ladle to tundish. It is that the rapidly rotating free surface vortex will form as the liquid level descending continuously. The surface vortex can cause the slag entrainment. In order to suppress slag entrainment by vortex during the steel teeming process, and to improve the cleanliness and quality of steel, the movement process of vortex and variation of flow field are studied through both numerical simulation and water model experiments. Since the eccentricity (eccentricity is the ratio of the nozzle distance and the ladle radius) has a large effect on the vortex formation, the vortex movement and flow field variation at different eccentricities are analyzed in details. And the mechanism of vortex suppression is found. It is that disturbing the velocity distribution of vortex formation or/and decreasing the tangential velocity value can suppress the movement and development of vortex. Thus the critical height of vortex can be decrease and the vortex can be availably suppressed. And then a method of vortex suppression is proposed according to this mechanism of vortex suppression. The method by blowing gas at the bottom of ladle is proposed. And the optimal gas flow rate and gas nozzle position are obtained.