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工业生产中铁水罐以一定角速度旋转,将高温铁水倒入转炉,产生非恒定的热羽流。工况非常复杂,无法实现系统的试验研究。故采用CFD(计算流体力学)方法研究铁水倾倒过程,基于两相流模型结合动网格技术,实现铁水倾倒过程的数值仿真。首先,针对简单二维模型,验证了采用两相流模型进行浮力羽流及浮射流模拟的可行性。然后,考虑了温差对气体粘度的影响,得出各阶段铁水罐和转炉上方尤其是人员操作区域的浮力羽流及浮射流的流场分布。这可为设计外围的通风系统和操作人员的安全防护提供科学的依据。
In the industrial production, the hot metal tank rotates at a certain angular speed, and the hot molten iron is poured into the converter to generate a non-constant hot plume. The working conditions are very complex and can not be systematically tested. Therefore, CFD (Computational Fluid Dynamics) method was used to study the pouring process of molten iron. Based on the two-phase flow model combined with moving grid technique, the numerical simulation of pouring process was realized. First of all, for a simple two-dimensional model, the feasibility of using two-phase flow model to simulate buoyancy plume and jet is verified. Then, the influence of temperature difference on gas viscosity was considered, and the flow field distribution of buoyancy plume and buoyant jet above the hot metal tank and converter in each stage was obtained. This provides a scientific basis for the design of the perimeter ventilation system and the safety of the operator.