PIV测速技术分析异型坯连铸结晶器流场

通过建立1∶1异型坯结晶器物理模型,采用PIV粒子测速技术,研究断面尺寸为767.3 mm×383.1 mm×103.2 mm异型坯结晶器不同工艺参数条件和不同水口结构对结晶器内流场的影响。PIV实验结果表明,减小拉速和增大水口底部内径可以有效地减小冲击深度,结晶器深度860 mm处水口中心最大流股速度分别下降了27.96%和41.46%;增加拉速和减小水口浸入深度可以提高流场下旋涡上顶点位置。通过减小拉速和浸入深度,增大水口底部内径可以改善结晶器内流场。

PIV measurement on flow field in the physical model of beam blank casting mold

The physical model of a beam blank continuous casting mold with a cross-section size of 767.3 mm×383.1 mm×103.2 mm have been established in the ratio of 1∶]1， in order to assess the influence of different technical parameters and nozzle structures on the flow field. PIV （particle Image Velocimetry） measurement technique was applied in this research. The experimental results showed that reducing the casting speed and increasing the inner diameter at the bottom of the nozzle can effectively reduce the penetration depth of the jet flow. The maximum velocity of jet flow at the depth of 860 mm in the mold decreased by 27.96% and 41.46%， respectively. Increasing the casting speed and decreasing the immersion depth of the nozzles can heighten the upper vertices of lower eddies in the flow field. The flow field in the mold can be improved by reducing the casting speed and the immersion depth of nozzles and increasing the inner diameter at the bottom of the nozzles.