旋流中间包夹杂物聚合行为的数值模拟

Numerical simulation of polymerization behavior of inclusion in the swirling flow tundish

旋流中间包是在注流区内设置旋流室,使钢液经长水口从旋流室底部沿着切线方向流入中间包内时重力势能转化为旋转动能,夹杂物跟随钢液在旋流室内旋转流动,更容易碰撞聚集长大。使用商业软件Fluent中的PBM模型模拟中间包内夹杂物跟随钢液流动过程中碰撞聚合长大的行为。模拟结果显示:考虑夹杂物之间的碰撞聚合,夹杂物聚合长大明显,夹杂物的数量密度减小,夹杂物平均直径增大。对比两种中间包,无旋流室中间包夹杂物平均直径从3.93μm增大到4.25μm,增大8.12%;旋流中间包夹杂物平均直径从3.93μm增大到4.35μm,增大10.68%,旋流中间包更有利于夹杂物的碰撞长大。

The swirling flow tundish is the tundish that adds a swirl chamber in the injection zone.The gravity potential energy is converted into rotating kinetic energy when the molten steel flows into the tundish along the tangent direction from the bottom of the swirl chamber through the long nozzle.Inclusion follows the molten steel rotating in the swirling chamber and is more likely to collide and grow.The PBM model of the commercial software Fluent was used to simulate the behavior of inclusion colliding growth during the process of inclusion flowing into the tundish with molten steel.The simulation results showed that considering the collision and polymerization between inclusions,the polymerization and growth of inclusion was obvious.The number density of inclusion was decreased and the average diameter of inclusion was increased.The same size parameter of the swirling flow tundish was compared with the non-swirling chamber tundish.The average diameter of inclusion in non-swirling chamber tundish increased from 3.93μm to 4.25μm,increased by 8.12%.The average diameter of inclusion in swirling tundish increased from 3.93μm to 4.35μm,increased by 10.68%.Swirling flow tundish is more conducive to the collision growth of inclusion.