工程科学学报，第38卷，第10期：1393-1403,2016年10月 Chinese Journal of Engineering,Vol.38,No.10:1393-1403,October 2016 D0l:10.13374/j.issn2095-9389.2016.10.007:http://journals..ustb.edu.cn 基于PV技术的板坯连铸结晶器内钢水流动行为 研究 任磊，张立峰四，王强强，赵星 北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mail:zhanglifeng(@usth.cdu.cm 摘要利用粒子图像测速技术，以200mm×2040mm板坯连铸结晶器为原型，建立1：4水模型进行实验，对结晶器内钢液流 动形态、流速及各流态所占比例、液面波动、以水口为中心结晶器两侧对称点速度随时间的变化、水口两侧液面水平流速、水 口两侧对称位置液面至结晶器底部垂直方向速度和钢液对两侧窄面的冲击深度进行系统地研究和分析，并对比拉速的影响. 研究表明，粒子图像测速技术不仅可以测量结晶器内流场流速，还可以对流场对称性进行全方位、多角度定量分析，为研究连 铸参数变化，比如拉速、水口结构和水口浸入深度，对板坯连铸结晶器内钢液流动及对称性的影响提供一种较为精确的方法 和思路.通过分析得出，在本实验条件下拉速0.5mmin优于0.6mmin 关键词连铸：结品器；流体流动：粒子图像测速技术：对称性 分类号TF777.1 Study on fluid flow in a continuous casting slab mold using particle image velocimetry REN Lei,ZHANG Li-feng,WANG Qiang-qiang,ZHAO Xing School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:zhanglifeng@ustb.edu.cn ABSTRACT A 1/4 scale water model of slab molds was built to investigate the fluid flow and its symmetry during casting.The mod- el was established according to a 200 mm x 2040 mm actual mold.The velocity in the mold was measured by using particle image ve- locimetry (PIV).By analyzing the velocity field,the fluid flow behaviors such as flow patterns,level fluctuation,time history of speed on symmetrical points,horizontal speed below the meniscus,vertical speed nearby the narrow face and impingement depth could be studied.The effect of casting speed on the fluid flow behaviors mentioned above was investigated.The results show that the PIV technology can not only measure the velocity field,but also show the flow symmetry in a distinctive perspective so that proposing meas- ures for the continuous casting process,such as casting speed,the geometric of the submerged entry nozzle (SEN)and submergence depth of SEN.After analysis,a conclusion can be drawn that the casting speed at 0.5mminis better than 0.6mminunder the casting condition.The results show that the PIV technology is a useful method to optimize the continuous casting conditions. KEY WORDS continuous casting:molds;fluid flow;particle image velocimetry:symmetry 连铸结晶器内的钢液流动是一个复杂的三维湍流性冈、液面流速网、液面波动0等指标控制不当就会引 流动，由于其工作条件和环境所限无法对结晶器内部 起液态保护渣卷入钢液5-可，造成连铸坯质量下降. 钢液流动特征进行直接研究，但生产过程中若对其内 Yoshida等网研究发现液态保护渣卷入结晶器钢液内 部钢液的流动形态0、以水口为中心两侧流股的对称 部主要有五种方式（如图1所示）：(1)钢液从水口两 收稿日期：2015-12-31 基金项目：国家自然科学基金资助项目(51274034,51334002,51404019)工程科学学报，第 38 卷，第 10 期: 1393--1403，2016 年 10 月 Chinese Journal of Engineering，Vol． 38，No． 10: 1393--1403，October 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 10． 007; http: / /journals． ustb． edu． cn 基于 PIV 技术的板坯连铸结晶器内钢水流动行为 研究 任 磊，张立峰，王强强，赵 星 北京科技大学冶金与生态工程学院，北京 100083  通信作者，E-mail: zhanglifeng@ ustb． edu． cn 摘 要 利用粒子图像测速技术，以 200 mm × 2040 mm 板坯连铸结晶器为原型，建立 1∶ 4水模型进行实验，对结晶器内钢液流 动形态、流速及各流态所占比例、液面波动、以水口为中心结晶器两侧对称点速度随时间的变化、水口两侧液面水平流速、水 口两侧对称位置液面至结晶器底部垂直方向速度和钢液对两侧窄面的冲击深度进行系统地研究和分析，并对比拉速的影响． 研究表明，粒子图像测速技术不仅可以测量结晶器内流场流速，还可以对流场对称性进行全方位、多角度定量分析，为研究连 铸参数变化，比如拉速、水口结构和水口浸入深度，对板坯连铸结晶器内钢液流动及对称性的影响提供一种较为精确的方法 和思路． 通过分析得出，在本实验条件下拉速 0. 5 m·min － 1优于 0. 6 m·min － 1 ． 关键词 连铸; 结晶器; 流体流动; 粒子图像测速技术; 对称性 分类号 TF777. 1 Study on fluid flow in a continuous casting slab mold using particle image velocimetry ＲEN Lei，ZHANG Li-feng ，WANG Qiang-qiang，ZHAO Xing School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: zhanglifeng@ ustb． edu． cn ABSTＲACT A 1 /4 scale water model of slab molds was built to investigate the fluid flow and its symmetry during casting． The mod￾el was established according to a 200 mm × 2040 mm actual mold． The velocity in the mold was measured by using particle image ve￾locimetry ( PIV) ． By analyzing the velocity field，the fluid flow behaviors such as flow patterns，level fluctuation，time history of speed on symmetrical points，horizontal speed below the meniscus，vertical speed nearby the narrow face and impingement depth could be studied． The effect of casting speed on the fluid flow behaviors mentioned above was investigated． The results show that the PIV technology can not only measure the velocity field，but also show the flow symmetry in a distinctive perspective so that proposing meas￾ures for the continuous casting process，such as casting speed，the geometric of the submerged entry nozzle ( SEN) and submergence depth of SEN． After analysis，a conclusion can be drawn that the casting speed at 0. 5 m·min － 1 is better than 0. 6 m·min － 1 under the casting condition． The results show that the PIV technology is a useful method to optimize the continuous casting conditions． KEY WOＲDS continuous casting; molds; fluid flow; particle image velocimetry; symmetry 收稿日期: 2015--12--31 基金项目: 国家自然科学基金资助项目( 51274034，51334002，51404019) 连铸结晶器内的钢液流动是一个复杂的三维湍流 流动，由于其工作条件和环境所限无法对结晶器内部 钢液流动特征进行直接研究，但生产过程中若对其内 部钢液的流动形态［1］、以水口为中心两侧流股的对称 性［2］、液面流速［3］、液面波动［4］等指标控制不当就会引 起液态保护渣卷入钢液［5--7］，造成连铸坯质量下降． Yoshida 等［8］研究发现液态保护渣卷入结晶器钢液内 部主要有五种方式( 如图 1 所示) : ( 1) 钢液从水口两