D0L:10.13374/.issn1001-053x.2012.05.015 第34卷第5期 北京科技大学学报 Vol.34 No.5 2012年5月 Journal of University of Science and Technology Beijing May 2012 连铸电磁旋流水口流体流动和夹杂物行为 耿佃桥)雷洪) 苏志坚)赫冀成”孙琮琮 1)东北大学材料电磁过程研究教有部重点实验室，沈阳1108192)总装工程兵驻沈阳地区军事代表室，沈阳110819 ☒通信作者，E-mail:gengdiangiao(@cpm.neu.edu.cn 摘要采用数值模拟方法对连铸电磁旋流水口内流体流动和夹杂物碰撞长大行为进行了研究。数值结果表明电磁旋流水 口出口处流体流动扩张角与低熔点合金实验值相符.旋转磁场对浸入式水口内壁夹杂物沉积行为存在两个相反的作用：一方 面旋转磁场作用加强了水口壁面处钢液的湍流流动，加速了夹杂物在水口内壁的沉积吸附速率：另一方面水口内壁附近夹杂 物在旋转磁场产生的旋流作用下易被携带至水口中心，削弱了水口内壁对夹杂物的黏附.在上述两方面因素作用下，钢液区 存在一个最佳磁感应强度可使水口内壁夹杂物沉积速率降至最低，从而减轻水口结瘤现象 关键词连铸：磁场：旋流：水口：夹杂物：数值分析 分类号TF777.1 Fluid flow and inclusion behavior in the nozzle with a rotating magnetic field during continuous casting GENG Dian-qiao,LEI Hong,SU Zhi-jian,HE Ji-cheng,SUN Cong-cong? 1)Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education of China),Northeastem University,Shenyang 110819,China 2)Engineer Military Representative Office of the General Armaments Department in Shenyang Area,Shenyang 110819,China Corresponding author,E-mail:gengdianqiao@epm.neu.edu.cn ABSTRACT A numerical simulation method was applied to investigate the fluid flow as well as the inclusion collision and growth behavior in a swirling flow nozzle induced by a rotating magnetic field during continuous casting.Numerical results indicate that the divergent angle at the submerged entry nozzle (SEN)outlet agrees well with the experimental values of low melting point alloys.The rotating magnetic field has positive and negative effects on the deposition rate of inclusions on the SEN sidewall.On one hand,the turbulence flow near the SEN sidewall enhanced by the rotating magnetic field increases the deposition rate of inclusions on the side- wall:on the other hand,inclusions near the SEN sidewall have a tendency to move towards the SEN center under the rotating magnetic field,which decreases the deposition rate of inclusions on the SEN sidewall.Due to these two paradoxical factors,there is an optimum magnetic induction intensity to minimize the deposition rate of inclusions on the SEN sidewall and the clogging phenomenon can be weakened. KEY WORDS continuous casting:magnetic fields;swirling flow:nozzles:inclusions:numerical analysis 在连铸生产中，钢液由中间包流出后进入浸入 夹杂物在水口内壁黏附沉积后结瘤易导致出口处出 式水口，并通过水口下端出口进入结晶器，在结晶器 现偏流，而且结瘤脱落后被凝固前沿捕捉会对铸坯 内发生凝固形成钢坯.水口出口作为结晶器的流动 质量产生严重影响0，因此开展浸入式水口内夹杂 入口，直接影响到结晶器内的钢液流态，从而对结晶 物行为研究对实际生产具有重要意义.在水口施加 器内温度场及渣金液面行为产生影响-一).由于 旋转磁场可有效改善水口出口的偏流现象，并且旋 收稿日期：201104-21 基金项目：国家高技术研究发展计划资助项目(2009AA03Z530):国家自然科学基金和上海宝钢集团公司联合资助项目(50834010)：高等学校 学科创新引智计划资助项目(07015)：教育部留学回国人员科研启动基金资助项目(20071108一2)：中央高校基本科研业务费资助项目 (N100409007):国家自然科学基金资助项目(51174058,51104047)：辽宁省博士启动基金项目(20111009)第 34 卷 第 5 期 2012 年 5 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 34 No． 5 May 2012 连铸电磁旋流水口流体流动和夹杂物行为 耿佃桥1) 雷 洪1) 苏志坚1) 赫冀成1) 孙琮琮2) 1) 东北大学材料电磁过程研究教育部重点实验室，沈阳 110819 2) 总装工程兵驻沈阳地区军事代表室，沈阳 110819 通信作者，E-mail: gengdianqiao@ epm． neu． edu． cn 摘 要 采用数值模拟方法对连铸电磁旋流水口内流体流动和夹杂物碰撞长大行为进行了研究． 数值结果表明电磁旋流水 口出口处流体流动扩张角与低熔点合金实验值相符． 旋转磁场对浸入式水口内壁夹杂物沉积行为存在两个相反的作用: 一方 面旋转磁场作用加强了水口壁面处钢液的湍流流动，加速了夹杂物在水口内壁的沉积吸附速率; 另一方面水口内壁附近夹杂 物在旋转磁场产生的旋流作用下易被携带至水口中心，削弱了水口内壁对夹杂物的黏附． 在上述两方面因素作用下，钢液区 存在一个最佳磁感应强度可使水口内壁夹杂物沉积速率降至最低，从而减轻水口结瘤现象． 关键词 连铸; 磁场; 旋流; 水口; 夹杂物; 数值分析 分类号 TF777. 1 Fluid flow and inclusion behavior in the nozzle with a rotating magnetic field during continuous casting GENG Dian-qiao 1) ，LEI Hong1) ，SU Zhi-jian1) ，HE Ji-cheng1) ，SUN Cong-cong2) 1) Key Laboratory of Electromagnetic Processing of Materials ( Ministry of Education of China) ，Northeastern University，Shenyang 110819，China 2) Engineer Military Representative Office of the General Armaments Department in Shenyang Area，Shenyang 110819，China Corresponding author，E-mail: gengdianqiao@ epm． neu． edu． cn 收稿日期: 2011--04--21 基金项目: 国家高技术研究发展计划资助项目( 2009AA03Z530) ; 国家自然科学基金和上海宝钢集团公司联合资助项目( 50834010) ; 高等学校 学科创新引智计划资助项目( B07015) ; 教育部留学回国人员科研启动基金资助项目( 20071108--2) ; 中央高校基本科研业务费资助项目 ( N100409007) ; 国家自然科学基金资助项目( 51174058，51104047) ; 辽宁省博士启动基金项目( 20111009) ABSTRACT A numerical simulation method was applied to investigate the fluid flow as well as the inclusion collision and growth behavior in a swirling flow nozzle induced by a rotating magnetic field during continuous casting． Numerical results indicate that the divergent angle at the submerged entry nozzle ( SEN) outlet agrees well with the experimental values of low melting point alloys． The rotating magnetic field has positive and negative effects on the deposition rate of inclusions on the SEN sidewall． On one hand，the turbulence flow near the SEN sidewall enhanced by the rotating magnetic field increases the deposition rate of inclusions on the side￾wall; on the other hand，inclusions near the SEN sidewall have a tendency to move towards the SEN center under the rotating magnetic field，which decreases the deposition rate of inclusions on the SEN sidewall． Due to these two paradoxical factors，there is an optimum magnetic induction intensity to minimize the deposition rate of inclusions on the SEN sidewall and the clogging phenomenon can be weakened． KEY WORDS continuous casting; magnetic fields; swirling flow; nozzles; inclusions; numerical analysis 在连铸生产中，钢液由中间包流出后进入浸入 式水口，并通过水口下端出口进入结晶器，在结晶器 内发生凝固形成钢坯． 水口出口作为结晶器的流动 入口，直接影响到结晶器内的钢液流态，从而对结晶 器内温度场及渣金液面行为产生影响［1-- － 3］． 由于 夹杂物在水口内壁黏附沉积后结瘤易导致出口处出 现偏流，而且结瘤脱落后被凝固前沿捕捉会对铸坯 质量产生严重影响［4］，因此开展浸入式水口内夹杂 物行为研究对实际生产具有重要意义． 在水口施加 旋转磁场可有效改善水口出口的偏流现象，并且旋 DOI:10.13374/j.issn1001-053x.2012.05.015