Abstract: A three-dimensional mathematical model was built to study the transient molten steel flow phenomena during the casting start period in the compact strip production (CSP) process. An algorithm of volume of fluid (VOF) was used to simulate the air-steel interface. The obtained numerical results were validated by those available in the literature. The results show that at the beginning of filling process, the droplets separated from the jet of molten steel and sputtering by the jet impacting on the free surface of molten steel may contact with the mould copper plate. At the beginning of movement of the dummy bar, there exists serious fluctuation in the meniscus and the maximum wave height is about 25 mm. During the casting start process, the stabilization of free surface may need 80.0 s after moving of the dummy bar and when the meniscus is stable, there still exists flow deviation of molten steel in the funnel-type mould. When the molten steel surface is stable, the dummy bar is 3 m or so far away from the meniscus.

Key words: compact strip production, thin slab continuous casting, funnel-type mould, casting start, surface fluctuation, numerical simulation

摘要： 建立了用于描述紧凑式热带工艺(CSP)连铸机漏斗形结晶器开浇过程暂态流动现象的三维数学模型，利用流体体积(VOF)模型对自由液面进行描述，模拟结果通过相关文献得以证实. 结果表明，填充过程中，从钢液射流分离出的液滴及射流冲击自由液面溅射的液滴均有可能与结晶器铜板接触；引锭杆启动时，自由液面波动剧烈，最大波高约为25 mm，稳定液面在引锭杆启动后约80.0 s获得；拉坯过程中，钢液自由液面稳定时，结晶器内部流场存在明显的偏流现象；自由液面稳定时，引锭杆离弯月面约3 m.

关键词: 紧凑式热带工艺, 薄板坯连铸, 漏斗形结晶器, 浇注, 液面波动, 数值模拟