挡墙结构对46 t中间包钢液流动特性影响的数值和物理模拟

通过采用流动力学软件FLUENT进行的数值模拟和几何相似比1:3的水模型分别研究了导流孔倾角30°的U型挡墙和导流孔倾角分别为20°,25°,30°的V型挡墙4种结构的挡墙对46 t两流T型Φ800 mm圆铸坯中间包钢液流动特性的影响,并采用稳态模拟计算中间包钢液的温度场分布。结果表明,两种模拟结果有良好的一致性;使用导流孔倾角20°的V型挡墙的中间包流动特性最佳,中间包出口流温差仅为4.0 K,整体最大温差为14.2 K,停留时间最长为803.1 s,死区体积分数最小为0.09,更有利去除钢液夹杂物,提高钢的洁净度。

Numerical and Physical Simulation for Effect of Baffle Structure on Flow Characteristics of Liquid in a 46 t Tundish

The effect of four kinds of baffle structure- U type baffle with guide flow hole angle 30°, and V type baffle respective with guide flow hole angle 20°, 25° and 30° on liquid flow characteristics of liquid in a 46 t T type tundish for casting double strands Φ800 mm round bloom are respectively studied by numerical simulation with fluid dynamic software FLUENT and with geometric similarity ratio 1:3 water model, and the distribution of temperature of liquid in tundish is calculated by stable simulation. Results show that both simulated results have better consistence; the flow characteristic of liquid in tundish using V type baffle with guide flow hole angle 20° is best, i. e. the temperature difference of flow at outlet of tundish is only 4.0 K, whole liquid max temperature difference is 14.2 K, longest residence time is 803.1 s and dead zone volume fraction is minimum- 0.09, it is available to move inclusions in liquid and enhance cleanliness of steel.