异形坯结晶器三维流场模型的研究

Model of 3-D Flow Field of Crystallizer for Beam Blank

依照湍动能理论及异形坯连铸的特点 ,建立了异形坯结晶器三维流场数学模型。运用该模型分析了不同水口参数及工艺参数条件下的流场分布 ,从而得出影响结晶器内钢液流动的因素有水口倾角、水口浸入深度及拉坯速度。结果表明 :采用上倾 15°有利于夹杂物上浮 ;拉速 0 .9m/s可使流场分布均匀 ;适宜的水口深度可选 2 0 0mm。利用该模型可对连铸过程进行离线分析 ,确定最佳参数 。

Model of 3 D flow field of crystallizer for beam blank was developed based on turbulent theory and characteristics of continuous casting. The model was applied to analyze flow field distributions with various nozzle and processing variables. It is found that the factors affecting the fluid flow of liquid steel in crystallizer are nozzle obliquity, immersing depth and drawing velocity. The results showed that it is beneficial to remove the inclusion at +15 ℃nozzle obliquity and to uniform flow field distribution at 0.9m/s drawing velocity. Proper nozzle depth is 200 mm. The model can be used to conduct off line analysis and to determine optimum variables as well as to lay the base of on line controlling model in continuous casting process.