Numerical Simulation Of Flow Characteristics In A Continuous Casting Mold With Static Magnetic Field

With the development of continuous casting technology, casting quality and productivity has become the two major factors that restricting the development of slab continuous casting process. Electromagnetic brake technology can ensure the quality of slab under the precondition of high productivity, and as a relatively mature technology on the industry field, although EMBr can restrain many adverse phenomenon brought by high casting speed, how to further optimize the structure parameters, electromagnetic parameters and process parameters with EMBr and getting the optimized effect of EMBr both have important practical significance for the application of EMBr technology.The research applies FLUENT commercial software to have a research on the flow characteristics in the mold with LMF, FC-mold and FC-mold â…¡ by using numerical simulation, investigating the effect of different magnetic pole structure, different magnetic intensity and different casting speed on flow field, distribution of surface velocity, molten steel discharged from the SEN impacts on the narrow face, the shape of meniscus and the height of meniscus in the mold. And by comparing effect of electromagnetic brake with different magnetic pole, we obtain the best solution of optimal electromagnetic braking effect in the simulation conditions of this research. By comparing numerical simulation results and surface velocity measurement results under nail board dip test, meniscus shape of stainless steel plate measurement results for the actual casting machine. After proving calculating models, we found that they are anastomotic essentially.The research result shows:the impact on the narrow face of the steel flow discharged from the SEN can be restrained and the penetration depth of downward flow can be shortened with Level Magnetic Fields, the maximum horizontal velocity near the narrow face with0.35T LMF reduced70%when compared with no EMBr, the impact position on the narrow face is raised100mm with0.35T LMF. But surface velocity is not monotone decreasing with the increase of magnetic intensity when applying LMF, so increasing the magnetic intensity can not control the surface velocity effectively. FC-mold can control the surface velocity and make the height of meniscus reduced dramatically due to the existence of the upper pole, but surface velocity is excessively restrained with0.35T FC-mold. FC-mold â…¡ can be adjusted respectively according to the electromagnetic force due to the two poles are equipped with independent power supply, the lower pole is stronger and the upper pole is weaker as usual, applying FC-mold â…¡ not only makes the impact on the narrow face of the steel flow discharged from the SEN restrained and the penetration depth of downward flow shortened, but also controls surface velocity within a reasonable range. In the simulation conditions of this research, choosing the match that lower pole is0.35T and upper pole is0.15T in a casting speed1.8m/min or2.2m/min, we can obtain the best electromagnetic braking effect.