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运用有限元方法对不同频率下电磁搅拌辅助装置中心处磁场强度以及熔池电磁力进行了模拟分析,并研究了旋转磁场对熔池电磁力和熔池温度分布及流场影响。结果表明,当电流频率增大时,熔池中电磁力首先有缓慢减小趋势,同时功率损耗迅速增大,当频率继续增大时,电磁力逐渐增大,此时功率损耗基本趋于稳定;在激励电流变化的一个周期内,搅拌装置中磁场强度也发生周期性变化。在施加旋转磁场条件下,熔池整体温度有所降低,温度梯度减小,熔池内形成围绕熔池做周向流动的环流,流速分布均匀。
The magnetic field strength at the center of the electromagnetic stirring assisting device at different frequencies and the electromagnetic force of the molten pool were simulated by using the finite element method. The influence of the rotating magnetic field on the electromagnetic force and the temperature distribution and the flow field of the molten pool was also studied. The results show that when the current frequency increases, the electromagnetic force in the molten pool first decreases slowly and the power loss rapidly increases. When the frequency continues to increase, the electromagnetic force gradually increases, and the power loss basically stabilizes ; During the period of excitation current change, the intensity of the magnetic field in the stirring device also changes periodically. Under the condition of applying rotating magnetic field, the overall temperature of the molten pool decreased, the temperature gradient decreased, and the circulating flow formed around the molten pool formed in the molten pool, the flow velocity was evenly distributed.