Numerical And Physical Simulation Of Vortex Formation At The End Of Ladle Pouring

It is acknowledged that the inclusions formed in the tapping process are a main factor that affect the quality of molten steel and products.In this paper,120 t ladle in a steel plant is taken as the research object.According to the research methods of mathematical model and water model,the influences of factors such as ladle liquid level height,bottom blowing and stirring,diameter of steel outlet,eccentricity ratio and swirl resistance device on the vortex in the process of steel are studied,so as to provide technological reference for the production of high-quality clean steel.According to the water mold experiment,the initial liquid level increased from350 mm to 950 mm,and the whirlpool and critical height decreased by 55 % and66.9 % respectively.The bottom blowing vortex of ladle has the best effect of 31.37L/min with symmetrical distribution of pores and air blowing volume.The diameter of the outlet was increased from 20 mm(prototype 60 mm)to 60 mm(prototype 180mm),and the whirlpool and critical height decreased by 52.3 % and 60.6 %respectively.The eccentricity increased from 0 to 0.95,and the whirlpool and critical height decreased by 63.8 % and 87.5 %,respectively.When the vortex device is distributed at the bottom and the vortex baffle is distributed with the water mouth as the center,the effect of the vortex suppression is the best.When the vortex baffles are distributed around the nozzle,the more the number of vortex baffles increases,the vortex suppression effect will be better.Numerical simulation is used to study the influence of different factors,such as nozzle position,outlet diameter and vortex device,on the change of velocity field of fluid in ladle.The diameter of the outlet increased from 20 mm to 60 mm,the horizontal tangential velocity of the fluid at 50 mm above the outlet decreased by341 %,the critical height of the vortex decreased by 75.89 %,and the tangential velocity of the fluid increased by 71.03 % when the ladle was poured from 5 s to 150 s.The larger the eccentricity rate is,the slower the tangential velocity increases and the longer the vortex takes to form.The maximum tangential velocity of the fluid in each subscheme is 0.43 m/s,0.25 m/s,0.15 m/s,0.58 m/s,0.45 m/s and 0.38 m/s respectively.Compared with the unimpeded conditions,the maximum circumferential velocity of the vortex is reduced by 43.80 %,67.41 %,80.30 %,24.38 %,41.19 %and 50.19 %.