旋流水口对小方坯连铸结晶器流场影响的水模拟

通过在连铸水口的水力学模型内安置的旋流叶轮模拟了水口电磁搅拌的作用,使模型实验中水口出流呈螺旋状流态.用超声波Doppler测速仪定量测量结晶器模型内液流的垂直及水平速度,检验水口电磁搅拌的效果,分析有效的工艺参数.结果表明,旋流式水口有利于改善结晶器内的流场,有效降低冲击深度,增大液流向弯月面区域的回流和热流上传,使液面形成水平环流,提高了液面的活跃程度,增强钢水表面融渣的效果.

Effect of Swirling Flow out of Nozzle on Flow Field in Continuous Casting of Billet

Electromagnetic stirrer was fixed on intermediate zone of the nozzle to make molten steel outflow with swirling flow, reduce dashing depth of molten steel and form a up reversing flow. All of these were to get the mold powder melted, shell solidified and uniform composition in the continuous casting of special steel billet. This paper was to simulate the effect of electromagnetic stirring in submerged entry nozzle (SEN) through setting a swirl blade in SEN of the hydromechanics mode. This method used was to impart swirl to the flow. On the basic of this, the vertical velocity and horizon velocity of liquid level in the model were measured using Ultrasonic Doppler Velocity (UDV).The effectiveness of electromagnetic stirrer and analyzing technological parameter were examined. Following issues were obtained: (1) Swirling flow was in favor of flow field in mold. (2)The dashing depth can be reduced effectively. (3)The reversing flow and heat transmission of meniscus were enlarged. (4)The horizon circulating was formed so the activity of liquid level and the effectiveness of molten slag were increased.