Numerical Simulation Of Magnetic Field And Fluid Flow In Continuous Casting Mold With A New Pattern Electromagnetic Brake

The electromagnetic brake is one of the most promising methods to ensure the continuous casting product under the condition of high casting speed, it can control the fluid flow behavior in the mold, depress melt fluid impact to the narrow side of the mold and prevent the breakout. Meanwhile, it's helpful to float the inclusions and improve the quality of products by decreasing the impinging depth. It has been applied as a mature technique to control the flow of melt metal in the mold in continuous casting of steel. However, the optimization of electromagnetic brake configuration, electromagnetic parameters and processing parameters is more important subject to obtain optimal effect of electromagnetic flow control.In this paper, a new pattern electromagnetic brake is proposed and its characteristics of magnetic field and fluid flow behavior of melt in the mold was investigated by numerical simulation methods. The main research work and results are as following:The three-dimensional mathematical model was established to describe magnetic field in the continuous casting mold with electromagnetic brake. The distribution of magnetic field has been simulated with ANSYS-Soft. The numerical simulation results show that the magnetic flux density forms a closed magnetic circuit in magnet region. The distribution of magnetic field is uniform in the direction of width, thickness and depth. The magnetic field characteristic of the new pattern electromagnetic brake can satisfy the requirement of continuous casting electromagnetic brake.Based on the theory of static magnetic field and magneto-hydro-dynamics, the 3D-mathmatical model of fluid flow in the continuous casting mold with electromagnetic brake was established by the Fluent-soft. Applying the mathematical models, the couple calculation of fluid flow and magnetic field in the mold under new pattern electromagnetic brake was carried out, and the influence of several variables, such as casting speed, immersion depth of nozzle and magnetic flux density, on the effect of electromagnetic brake was studied. The numerical calculation results are as following:when the magnetic field was imposed, the fluid flow from the nozzle is greatly braked by electromagnetic force, the free surface velocity and turbulence energy are obviously decreased, so it is helpful to reduce the roll of the non-metal inclusions. Meanwhile, the velocity impinging on the narrow sides of mold is obviously decreased, which is helpful to the float and removal of inclusions. For general slab continuous casting,0.3T is an optimal magnetic flux density for braking effect on the fluid flow, and the free surface velocity is greatly reduced. However, the free surface velocity will increase when the magnetic flux density less than 0.3T. The new pattern electromagnetic brake will control the fluctuation of free surface and the impinging on the narrow sides of mold with the reasonable magnetic field parameters.