【摘要】 特厚板坯连铸技术主要应用于特种装备制造领域，市场需求量较大。浸入式水口的结构是决定结晶器中流场流动行为的关键因素。本研究通过建立三维数值模型，研究浸入式水口侧孔倾角对475 mm特厚板坯结晶器内流场流动行为、温度场和凝固坯壳分布的影响。结果表明，水口侧孔倾角对钢液流动行为影响显著：当侧孔倾角由-20°调整至-10°时，射流冲击深度由660 mm减小至545 mm，结晶器自由液面平均温度升高4 K；此外，侧孔倾角的减小使凝固坯壳尤其是窄面坯壳厚度增加6 mm。综合考虑，当水口侧孔倾角为-10°时，结晶器性能最佳，此时的液面流动较活跃，结晶器保护渣和液面之间的传热性良好，出口处的壳体厚度均匀，足以满足生产需要，可有效避免漏钢现象发生。更多还原

【Abstract】 Continuous casting of ultrathick slabs is a constantly developing technology, especially in the field of special products, and the market has a great demand for thick slabs. The structure of the submerged entry nozzle is regarded as a key factor determining the flow-related phenomena in the mold. In this study, a threedimensional numerical model is established to investigate the effect of the inclination angle of the side hole of the immersed nozzle on the flow behavior, temperature field, and solidification shell distribution in the mold.The results show that the inclination angle of the side hole significantly affects the flow behavior of the steel liquid. When the inclination angle of the side hole is adjusted from-20° to-10°, the depth of jet impact decreases from 660 mm to 545 mm, and the average temperature of the free liquid surface in the crystallizer increases by 4 K. In addition, the decreasing inclination angle increases the thickness of the solidification shell, especially the narrow face shell, by 6 mm. Overall consideration, when the Angle of the side hole of the water mouth is-10°, the mold performance is optimal, the liquid surface flow is more active, the heat transfer between the mold protection slag and the liquid surface is good, the shell thickness at the outlet is uniform enough to meet the production needs, can effectively avoid the occurrence of steel leakage phenomenon.更多还原