旋流中间包是在中间包注流区内设置旋流室，钢液经长水口从旋流室底部沿着切线方向流入中间包内，使重力势能转化为旋转动能，旋转的钢液促使夹杂物向旋流室中心聚集，促进夹杂物碰撞聚合长大。用ANSYS Fluent中的PBM模型模拟了夹杂物在旋流中间包内碰撞聚合长大，用DPM模型模拟不同粒径夹杂物的轨迹和去除率。结果表明，相同操作条件下，考虑夹杂物之间的碰撞聚合时，无旋流室中间包的夹杂物平均直径从3.93 μm增至4.25 μm，夹杂物去除率为40.07%；旋流中间包夹杂物的平均直径从3.93 μm增至4.35 μm，夹杂物去除率从30.09%提升至43.20%。旋流中间包对夹杂物的去除能力优于无旋流室中间包。

The SFT (swirling flow tundish) is a tundish with swirl chamber placed in the flow injection zone. The gravitational potential energy is converted into swirling kinetic energy as the liquid steel flows into the tundish from the bottom of the SC (swirling chamber) through a nozzle along the tangent direction. The swirling molten steel promotes the inclusions to gather towards the center of the swirling chamber, promoting the inclusions to collide and polymerize. In this work, the PBM model in ANSYS Fluent was used to simulate the growth of inclusions in SFT, the DPM model was used to simulate the removal rate and trajectory of different particle size inclusions. Simulation results showed that the average diameter of inclusions in the tundish without swirling chamber increased from 3.93 μm to 4.25 μm and the inclusion removal rate was 40.07% considering the collision polymerization between inclusions. Under the same operating conditions, the average diameter of inclusions in swirling flow tundish increased from 3.93 μm to 4.35 μm, and the removal rate of inclusions increased from 30.09% to 43.20%. The removal capacity of SFT was better than that of NSCT (non-swirling chamber tundish).