In continuous casting, the nozzle position may deviate from the center under actual operating conditions, which may cause periodic fluctuation of the steel-slag interface and easily lead to slag entrapment and gas absorption. Swirling nozzles can reduce these negative effects. A mathematical simulation method based on a round mold of steel components with a 600 mm diameter is applied to study the flow field of molten steel in a mold. The swirling nozzle is optimized through the establishment of a fluid dynamics model. Meanwhile, a 1:2 hydraulic model is established for validation experiments. The results show that, when the submerged entry nozzle (SEN) is eccentric in the mold, it results in serious bias flow, increasing the drift index in the mold up to 0.46 at the eccentric distance of 50 mm. The impact depth of liquid steel and turbulent kinetic energy can be decreased by increasing the rotation angle of the nozzle. The nozzle with one bottom hole, which significantly decreases the bottom pressure and turbulent kinetic energy, greatly weakens the scour on nozzle and surface fluctuation. In the eccentric casting condition, using the optimized swirling nozzle that employs a 5-fractional structure, in which the rotation angle of 4 side holes is 30° and there is one bottom outlet, can effectively restrain bias flow and reduce the drift index to 0.28, a decline of more than 39%.

中文翻译：

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圆形模具偏心流场旋流喷嘴的仿真与优化研究

在连续铸造中，喷嘴位置在实际操作条件下可能会偏离中心，这可能会导致钢渣界面的周期性波动，并容易导致炉渣截留和气体吸收。旋流喷嘴可以减少这些负面影响。应用基于直径为600 mm的钢部件的圆形模具的数学模拟方法来研究模具中钢水的流场。通过建立流体动力学模型来优化旋流喷嘴。同时，建立了1：2的水力模型用于验证实验。结果表明，当浸入式喷嘴（SEN）在模具中偏心时，会导致严重的偏流，在50 mm的偏心距离下，模具中的漂移指数增加到0.46。可以通过增加喷嘴的旋转角度来降低钢水的冲击深度和湍动能。带有一个底孔的喷嘴大大降低了底部压力和湍动能，极大地减弱了喷嘴上的冲刷和表面波动。在偏心铸造条件下，采用采用5分数结构的优化旋流喷嘴，其中4个侧孔的旋转角度为30°，并且有一个底部出口，可以有效地抑制偏流并将漂移系数降低至0.28 ，降幅超过39％。