Mathematical And Physical Modeling Study Of The Submerged Entry Nozzle For Thin Slab Continuous Casting

In this paper, the real submerged entry nozzle (SEN) applied to the Flexible ThinSlab Caster (FTSC) in a domestic steel works were used as the object of study, bymake use of two research methods of the model ratio1:1water model experimentsand a mathematical model simulation analysis, flow Field and level fluctuation ofmolten steel in long funnel mold of FTSC is researched based on two typicalsubmerged entry nozzles of FTSC casting with different SEN submerged depth andunder different casting pull speed and different mold section, which provides a theoryreference of the corresponding optimization design of the SEN for domestic thin slabcasting for the FTSC technological renovation to high pulling speed castingproduction and. The results show that:1) With the casting speed increased, the mold level fluctuation for used M4-SENwith four-port is much higher than that of the used M2-SEN with two-port, in order tosuppress mold level fluctuation and mold flux entrapment in the case of high castingspeed, the used M2-SEN with two-port is better to the used M4-SEN with four-portstructure.2) A pair symmetrical “the two-wheel-like” rotating flow region exists in FTSCmold by the M2-SEN with two-port main; there is a pair symmetrical extra upperoutlet stream in slightly upward angle for the M4-SEN with four port structures,which directly impact to the liquid surface of the mold, then will cause the greaterfluctuation of the mold level, and the more complicated flow pattern in the mold thanthe used M2-SEN with two-port structure in FTSC mold because of the two extrarotational flow zone formed.3) The maximum wave height difference of liquid level for the M2-SEN withtwo-port structure is near the narrow face side in the FTSC mold when production fora large cross-section and a small cross-section slab; while the maximum wave heightdifference of liquid level for the M4-SEN with four-port structure is near the narrowface side in the FTSC mold when production for a small cross-section slab, and that isthe middle of the half FTSC mold level when production for a large cross-sectionslab.