Formation of free-surface vortex and vortex suppression by rotating stopper-rod at end of tundish casting  

作　　者：Qing Fang Peng Zhao Hua Zhang Wen-hao Zhou Gang Yu Jia-hui Wang Hong-wei Ni 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan,430081,Hubei,China [2]Hunan Valin Xiangtan Iron and Steel Co.,Ltd.,Xiangtan,411101,Hunan,China [3]Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan,430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2024年第5期1104-1116,共13页

基　　金：the National Natural Science Foundation of China(52004191);the China Postdoctoral Science Foundation(2022M711120);the Science and Technology Research Project of Education Department of Hubei Province(B2022020);Besides,the numerical calculation is supported by High-Performance Computing Center of Wuhan University of Science and Technology.

摘　　要：A rotating stopper-rod technique was proposed to suppress the formation of free-surface vortex in the tundish.The large eddy simulation model coupled with volume of fluid model was developed to study the steel–slag–gas three-phase flow behavior.The critical slag entrapment height of the free-surface vortex and mass of residual steel were predicted at different rotating speeds(30,60,90 and 120 r/min)of the rotating stopper-rod.The numerical model was verified by water model experiment.The results showed that by rotating the stopper-rod in the opposite direction of the vortex above the submerged entry nozzle,the formation of vortex can be effectively disturbed and the critical height of the free-surface vortex can be reduced.Particularly for the 2nd strand,when the rotating speeds are 30,60,90 and 120 r/min,the critical height of the free-surface vortex above the 2nd strand is 7.3,4.7,6.3 and 7.4 cm,respectively.A reasonable rotating speed should be 60 r/min,which can reduce about 2 tons of residual steel.Other rotating speeds just can reduce about 1.6 tons of residual steel.

关 键 词：TUNDISH Free-surface vortex Stopper-rod Numerical simulation Multiphase flow 

分 类 号：O35[理学—流体力学]