开发了数学模型,以研究电磁制动(EMBR)对薄板坯连铸结晶器涡流的影响。结晶器内熔融钢水由结晶器浸入式水口(SEN)的两个侧孔流出。采用低雷诺数k-ε紊流模型计算有效粘度。数学模拟表明,即使在水口外形对称和注流稳定的条件下也能产生非对称的涡流。模拟中的非对称流动由数据冗余引起,数据冗余代替了实际生产中的水口堵塞、水口不对中和随机湍流等。涡流强度取决于由水口出流角和拉速决定的结晶器表面流速。施加静态磁场可以显著抑制涡流和改变涡流形态,但不能将其彻底消除。表面流速随线圈电流的减小而显著降低,同时结晶器内的波高明显变小。此外,浸入式水口附近由涡流引起的失稳区逐渐变得稳定。结晶器下部的下降流流速受到抑制并形成活塞流。 A mathematical model was developed to study the effect of electromagnetic braking (EMBR) on eddy current in thin slab continuous casting molds. The molten steel in the mold flows out through the two side holes of the mold immersion nozzle (SEN). The effective viscosity was calculated using a low Reynolds number k-ε turbulence model. Mathematical simulations show that asymmetric vortices can be generated even with a symmetrical nozzle shape and steady flow. Asymmetric flow in the simulation is caused by data redundancy, and data redundancy replaces blockage in actual production, nozzle misalignment and random turbulence. The eddy current strength depends on the crystallizer surface flow rate which is determined by the nozzle exit velocity and casting speed. The application of static magnetic field can significantly inhibit the vortex and change the vortex morphology, but can not be completely eliminated. The surface flow rate decreases significantly with decreasing coil current, and the wave height in the mold decreases significantly. In addition, the area of ​​instability caused by turbulence near the submerged entry nozzle gradually becomes stable. The downflow flow velocity in the lower part of the mold is suppressed and a plug flow is formed.