Numerical Simulation On Temperature Field And Flow Field In Mould

Physical and chemical phenomena which is complicated in high temperature is involved in continuous casting, and there have not been effectively means for testing in precision. So, the numerical simulation is supposed to be the best. Research on the behavior of the flow and heat transfer in the continuous casting mould by using mathematical mold plays an important role in the study of this field, which can offer basis in theory for control of industrial yield and mould design when the features of steel liquid flow and the distribution of the solidifying shell thickness are known.It is necessary to know and control the flow pattern of the steel in the mould, which is the key point to guarantee higher and more efficiency continuous casting technology and improve the quality of the products. Therefore, the flow pattern of molten steel in the mould was highly valued, the physical simulation and the numerical simulation were the most universal method. In view of the bloom mould, the flow pattern of molten steel in bloom mould of various SEN parameter was studied by adopting the numerical simulation.Utilizing the commercial software, the three dimensional mathematical model were set up according to the theory of computational fluid dynamics. The flow field and the temperature field in the mould under the conditions of different technological parameter were calculated. With the influence of immersion depth, angle of the nozzle port and the casting speed, the effects on the flow field and temperature field of the molten steel in the mould were studied. The influence on the inclusion elimination under different parameter were also discussed.From the numerical simulation research, the conclusions can be drawn:While the casting speed increasing, the level fluctuation and the jet impingement strength to the narrow wall increase, the temperature at the free surface also increases. These are benefit for the melting slag, but these are bad for the solidification of bloom at narrow wall of the mould. While the submerged depth of the SEN and the outlet angle of the SEN increase, this can improve the level fluctuation and reduce slag entrapment, but this will also form the lower temperature distribution at the upper recirculation in the mould, leading to surface quality problems.The inclusion elimination rate in the mould was more influenced by the casting speed. When the casting speed was 0.7m/min and the inclusion diameter was up to 300μm, the inclusion elimination effect is good. When the inclusion diameter was smaller than 100μm, the elimination rate was lower than 20% under different casting parameters. It is proved that the smaller the diameter inclusion is more difficult to remove in the mould. These explained that the mould was good to eliminate the inclusion with larger diameter.