PIV技术在中间包和结晶器流场模拟中的应用

针对异断面浇注，即同一板坯双流中间包内浇铸时，各流拉速和断面不同，生产不同规格铸坯的问题，采用用粒子成像测速技术（Particle Image Velocimetry，PIV）研究了钢液在中间包、结晶器水模型中的流场行为。根据PIV流场测速结果表明：断面尺寸差为200 mm时，中间包两流浇铸区平均流动速度相差约5.83%、最大速度相差约1.22%，结晶器流场差异不大，可进行异断面浇铸；断面尺寸差为1 100 mm时，中间包两流浇铸区流场速度差异最大约为50%，两流结晶器射流区平均速度、钢液冲击深度、涡心高度差异较大，不利于两流浇铸一致性，不建议进行异断面浇铸。

PIV measurement of flow field in physical simulation of slab continuous casting tundish and mold

Variable-width casting process is applied to producing different specifications of the slab with a tundish for two-strand slab casting. The discrepancy of the velocities and the widths between the two strands affects the casting process. Based on this situation, the flow field in the water models of tundish and mold with different casting sections was measured with Particle Image Velocimetry (PIV) system. The experimental results show that the variable-width casting process can be applied when the discrepancy of the widths between the two strands is small (about 200 mm), because of the similar flow field in the tundish and molds – the average velocity of two strands differ by about 5.83% and the maximum velocity differ by about 1.22%. However, it is not suitable for the large discrepancy of the widths between the two strands (about 1 100 mm), due to the differences in the velocity of jet region, the impact depth of liquid steel and the level of vortex center, which may reach up to about 50%. Those differences may worsen the consistency of the casting process between the two strands.