中文摘要：

针对断面为135mm×1200mm的薄板坯连铸结晶器，建立了4孔浸入式水口下薄板坯连铸结晶器内钢液流动、传热和凝固耦合的三维数学模型，引入F数评价薄板坯连铸结晶器内液面波动情况，分析结晶器内钢液流动、温度分布及凝固坯壳厚度的变化情况．结果表明，用F数评价薄板坯连铸结晶器内液面波动可行，拉速由1．44m／min增加到1．80m／min时，钢液液面波动的F数由1．05增加到2．55，凝固壳厚度（dshell）与凝固时间（t）满足关系式dshell=18．92t1／2-1．05，模拟结果与文献实验结果基本一致．

英文摘要：

A three-dimensional coupled numerical simulation model of molten steel flow, temperature and solidification in the mold of a thin slab caster is presented using FLUENT sottware. The computational model section is 135 mmxl200 ram, and submerged entry nozzle has four outlets. F value is introduced to evaluate the liquid level fluctuation in the thin slab continuous casting mold. The molten steel flow, temperature distribution and solidified shell thickness variation are discussed. The results show that F value applied in description of liquid level fluctuation in the thin slab mold is feasible, when the casting speed increased from 1.44 to 1.80 m/min, the F value increased from 1.05 to 2.55. The relationship between the shell thickness （dshen） and solidification time （t） in the mold and secondary cooling zone is regressed as dsheu=19.62t1/2-2.52, which basically agrees with the literatures.