Numerical Analysis of Coupled Turbulent Flow and Macroscopic Solidification in a Billet Continuous Casting Mould with Electromagnetic Stirring

摘要

Mould electromagnetic stirrers (M-EMS) have played an increasingly important role in improving inner quality of special steel billet. A coupled three-dimensional numerical simulation of the electromagnetic field, flow field and temperature distribution in the mold with M-EMS for billet continuous casting was carried out based on the finite element method. The influence of the current and frequency of M-EMS on the flow field and temperature distribution was discussed. According to the simulation results, with the increase of the current, the steady flow became unstable accompanying with the bias flow, and the temperature distribution was unsymmetrical. However, the effect of the frequency on flow field was exactly opposite compared with the current. The significant swirl flow with M-EMS prevented the superheated jet moving downward and weakened the invasion depth of the jet, and thus the location of the hot zone in the mould moved up evidently.