中文摘要：

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.

英文摘要：

A 1 /4 scale water model of slab molds was built to investigate the fluid flow and its symmetry during casting. The model was established according to a 200 mm × 2040 mm actual mold. The velocity in the mold was measured by using particle image velocimetry（ 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 measures 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.