Abstract: A rectangular continuous casting machine in a company is taken as the research subject. Combined with numerical simulation and physical simulation, the liquid steel flow behaviors and temperature distribution in the mold are systematically analyzed. The liquid steel flow field and heat flux distribution are calculated respectively at different outlet rake angles, immersion depths and casting speeds. The corresponding technological parameters are optimized as well. It is demonstrated that the best structure of submerged nozzle for 150 mm×330 mm rectangular cast bloom is the side opening for a runway shape with 30 mm inner diameter and 25° side opening angle.

Key words: mold, submerged nozzle, numerical simulation, physical simulation, structure optimization

摘要： 以某公司矩形钢坯连铸机结晶器为研究对象，利用数值模拟和物理模拟相结合的方法，对结晶器内钢液流动及温度分布进行系统分析，分别计算不同浸入式水口倾角、浸入深度、拉速等条件下结晶器内钢液流动状态及热流分布，并对相应的工艺参数进行优化. 结果表明，对于断面为150 mm′330 mm的矩形坯，最优的结晶器浸入式水口侧开孔形状为跑道形，内径30 mm，侧开孔角度25o.

关键词: 结晶器, 浸入式水口, 数值模拟, 物理模拟, 结构优化