Abstract: To solve the problem of poor flow state in the process of continuous casting and high percentage of the inclusions in molten steel, some improvement schemes regarding the flow control device of single strand tundish were proposed. The flow field and average residence time distribution of molten steel in the tundish under different schemes were comparatively investigated by numerical simulation and water model experiment. The optimal combination of flow control devices was proposed, the distance between the weir and the long nozzle is 1 090 mm, the height of the weir is 180 mm, the distance between of the weir and the dam is 260 mm, the height of the higher dam is 340 mm. Compared with the prototype tundish, the average residence time and plug zone are increased and the dead zone ratio is reduced by 7.14 %.The average removal rate of inclusions reaches 68.7 %, which is 6.6 % higher than the prototype tundish.

Key words: flow control device, RTD curves, numerical simulation, inclusion removal