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通过对中间包钢水中夹杂物运动行为的数值模拟,探讨了夹杂物颗粒碰撞凝聚﹑数密度的变化情况及其分布特征。结果表明,直径小于11μm夹杂物颗粒在中间包内容易随钢液从下水口流出,来不及碰撞凝聚和上浮去除;中间包内夹杂物颗粒在运动的同时,其自身的碰撞凝聚也在自发进行;随着碰撞过程的进行,夹杂物颗粒密度呈现先增大后减小的变化规律;钢液的湍流流动状态是促进夹杂物颗粒间碰撞凝聚的重要因素,湍动能耗散率越大,越有利于夹杂物颗粒间的碰撞凝聚,因此,越有利于大尺寸夹杂物颗粒的生成。
Through the numerical simulation of inclusion motion in tundish, the variation of collision and aggregation, number density and distribution of inclusion particles were discussed. The results show that inclusions with diameter less than 11μm are easy to flow out of the nozzle with the molten steel in the tundish, which is too late to collide and float. The inclusions in the tundish also move spontaneously while colliding with each other. As the collision process proceeds, the density of inclusions increases first and then decreases. The turbulent flow state of molten steel is an important factor to promote the collision and aggregation between inclusions. The larger the turbulent kinetic energy dissipation rate, the more Which facilitates the collision and aggregation between the inclusion particles, and therefore, is more conducive to the generation of large-sized inclusion particles.