非平衡布流异型坯结晶器水口结构优化的物理模拟

Physical simulation on optimization of submerged entry nozzle for non-equilibrium beam blank casting mold

以0.7∶1的几何相似比建立了异型坯结晶器的钢液流动物理模拟,研究了不同结构浸入式水口对结晶器各位置响应时间以及液面波动的影响。结果表明:现有直通型水口结晶器内流场分布极不对称,结晶器各位置响应时间相差较大,液面波动保持在±3 mm以内的比例为96.3%。最优改进方案水口(三侧孔型水口)有效的解决了结晶器各位置响应时间较长且不一致的问题,结晶器液面波动±3 mm以内的比例达到99.7%,液面波动±5 mm以内的比例达到100%。

A physical model of liquid steel flowing in beam blank casting mold was set at 0.7∶1 geometric similarity ratio,and the influence of response time at different position and liquid surface fluctuation was studied.It was showed that the flow field distribution in the existing through nozzle mould was extremely asymmetric and the response time of each position of the mould was quite different.The percentage of liquid level fluctuation kept within±3 mm was 96.3%.The optimal improvement scheme of nozzle(three side hole nozzle)effectively solves the problem of long and inconsistent response time at different positions of the mould,and the percentage of liquid level fluctuation kept within±3 mm is 99.7%and within±5 mm is 100%.