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结晶器内钢液流动状态会直接影响铸坯的质量,不合理的流场会导致液面流速过大,弯月面波动过大,造成卷渣。采用几何相似1:1水模型和Fluent流体力学软件研究了220 mm×260 mm方坯结晶器直通型水口浇注下,不同浸入深度对结晶器液面波动、表面流速、流场分布、冲击深度、保护渣覆盖的影响。结果表明:直通型水口流股集中,冲击深度较大,液面波动均匀,波动受浸入深度和拉速的影响较小。保护渣渣层覆盖良好,渣层均匀,出现卷渣的可能性较小。综合考虑冲击深度,保护渣活跃程度,结晶器电磁搅拌的影响,现场合适的浸入深度为80~100 mm。
Molten steel flow in the mold will directly affect the quality of the slab, the irrational flow field will lead to excessive flow velocity, meniscus fluctuations too large, resulting in entangled slag. The geometrical similarity 1: 1 water model and Fluent fluid mechanics software were used to study the influence of different immersion depths on the mold liquid surface velocity, flow field distribution, impact depth, Impact of mold powder coverage. The results show that the direct flow nozzle is concentrated, the impact depth is large, the liquid level fluctuates evenly, and the fluctuation is less affected by the immersion depth and the pulling speed. Good coverage of the protective slag layer, slag layer uniform, less likely to occur scum. Taking into account the impact depth, the degree of active slag, mold electromagnetic stirring, the appropriate depth of field immersion of 80 ~ 100 mm.