以水银为实验工质,通过物理模拟考察板坯连铸电磁制动时,电磁场对结晶器内液态金属流动的影响规律.采用超声波多普勒测速仪测量了结晶器上部磁场B1=0、0.18、0.36 T和0.5T,结晶器下部磁场B2 =0.5 T情况下,板坯结晶器(模型)内水银的流速分布,考察了磁场强度对结晶器内及液面处金属流动,及其对结晶器窄壁的冲刷作用等的影响.实验结果表明,板坯连铸时,对于抑制液面波动的结晶器上部磁场应选择较低的磁场强度,而用于实现钢水稳定和形成活塞流的结晶器下部磁场,则应选择高的磁场强度.在本文实验条件下,磁场匹配关系B1 =0.18 T、B2 =0.5 T时,结晶器内的金属流场较为理想,表现为届时既可控制液面波动,又能使结晶器下部的金属流动基本实现活塞流.%A mercury model was developed to investigate the liquid flow in continuous casting mold of slab with the electromagnetic brake. The velocity in mold with deferent magnetic field (the upper part of the magnetic field B1 increased from 0 T to 0. 18,0. 36 T and 0. 5 T,the lower part of the magnetic field B2 = 0. 5 T) was measured by ultrasonic Doppler velocity. The influence of the magnetic flux density on the flow in the mold, the flow of the meniscus and washing intensity to the thin wall of mold were analyzed and studied. The results showed that when the slab continuous casting, for the suppression of the upper mold level fluctuation should choose a lower magnetic flux density, and stability and the formation of steel used to achieve the ' Piston Flow' of the mold lower magnetic flux density should be chosen a high rate. In this experimental condition, the level fluctuation could be controlled and the ' Piston Flow' could be appeared as soon as possible in the lower part of the mold when B1 =0.18 T and B2 =0. 5 T.
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