离心中间包内钢液流动的数值模拟

采用数值模拟方法对离心中间包内钢液的流动结构及混合特性进行了研究,并用水模型结果进行了验证.流场的研究结果表明:旋转室内强烈的湍流极大地促进了夹杂物的湍流碰撞生长.另外,在旋转室切向出流的影响下,分配室内形成了较大的水平环流.环流的形成增强了钢液的混合程度,且延长了夹杂物沿着液面运动的距离,增大了夹杂物的去除机会.对钢液停留时间分布(RTD)的预测结果表明:由于钢液的旋转流动,离心中间包内的死区体积明显减小,活塞区及混流区体积增加,从而夹杂物的上浮去除率提高.

NUMERICAL SIMULATION OF MOLTEN STEEL FLOW IN CENTRIFUGAL FLOW TUNDISH

ABSTRACT Flow structure and RTD curve in Centrifugal Flow Tundish was predicted by mathematical simulation method, and the results were verified with the measurement data obtained from water model. Simulation results showed that, the molten steel in the rotation chamber rotated in a horizontal pattern due to the effect of electromagnetic force, and the swirling flow will promote the inclusion collision and coalescence. Deflection characteristic of the outflow from the rotation chamber leads to the asymmetrical distribution in the flow structure of distribution chamber, thus a horizontal circumfluence was formed and it will promote the mixture of molten steel and extend the residence time. Compared with the traditional tundish, the fraction of dead volume in the Centrifugal Flow Tundish was reduced, meanwhile the fraction of plug volume and mix volume were increased, and the study on the inclusion behavior also showed that the growth rate due to the collision and floatation rate of inclusions in the Centrifugal Flow Tundish was superior to traditional tundish.