Simulation Of Flow Field And Temperature Field In ASP Continuous Casting Mold

A numerical model is established for the continuous casting mold in the Angang Strip Production(ASP)medium and thin slab continuous casting and rolling line in Ansteel.The two mathematical models of the Reynolds-averaged Navier–Stokes(RANS)and Large Eddy Simulation(LES)are employed to research the flow field and temperature field in the mold when changing the nozzle,or immersion depth of nozzle,or casting speed,and argon blowing process parameters.The results of the two methods are analyzed,and the following conclusions are obtained:The flow field of three ports nozzle than which of bilateral ports nozzle is more stable and more uniform distribution.The free surface velocity of three-ports nozzle than that of liquid steel two ports nozzle is smaller.The water level fluctuation of three ports than that of bilateral ports nozzle is smaller,which can reduce the possibility of the mold Slag Entrainment.As the depth of the nozzle increases,the upstream roll flow area becomes larger,and the free surface velocity decreases,and the liquid surface fluctuation becomes smaller,and the free surface temperature decreases,which can reduce the possibility of the mold Slag Entrainment.But the downward flow vortex center will be moved down as the deeper depth of SEN,which increase opportunity of the inclusion into the slab depth.The primary shell is made thinner by downward movement of the high temperature zone,which increase the probability of the slab breakout.With the casting speed increases,the asymmetry of the flow field becomes more obvious,and the impact of molten steel on the narrow surface of the mold is intensified,which is easy to remelt the shell and increase the risk of the breakout;The increase of molten steel velocity is unfavorable to the floating of inclusions;The increase of free surface velocity causes the possibility of slag entrapment;The high temperature area of meniscus increases,which is beneficial to the melting of the mold slag.After the argon gas is blown into the mold,the impact point of the stream on the narrow face of the mold is shifted upward.The temperature of the free liquid surface is increased.The temperature distribution is more uniform.The free liquid surface velocity is reduced.The liquid surface fluctuation is reduced.By comparing the results of RANS and LES,it is found that the results of the two model methods can obtain similar conclusions in general,but many different places are showed in more details: As using RANS method the flow field of mold is basically uniform,but the flow field on both sides of the nozzle is symmetrical;The results of LES show that the flow field is asymmetric and there are more vortices can be captured by LES.The results obtained by LES are more accurate than those obtained by RANS,and can reflect many details,which can more realistically reflect the flow field in the mold.