Simulation Study About The Effect Of The Inner-swirl-type Turbulence Inhibitors On Flow Field And Inclusion Removal In Tundish

This paper studied the effects of inner-swirl-type turbulence inhibitors on the flow field of molten steel and the removal rate of inclusion in tundish.In order to form swirl flow at the pouring area of tundish,it added blades at the bottom of“A-frame” turbulence inhibitor and crescent-shaped blocks at the bottom of “B frame” turbulence inhibitor.This paper studied the effects of blades and crescent-shaped blocks of the turbulence inhibitors on the flow field of molten steel and the removal rate of inclusion by physical and mathematical model.The main conclusions were as follows:(1)B-frame turbulence inhibitor with crescent-shaped blocks could form strong swirl flow,the maximum rotation speed could be 49r/min.A-frame turbulence inhibitor with blades could also form swirl flow,but its effect was not better then B-frame turbulence inhibitor with crescent-shaped blocks.(2)It formed strong swirl flow at the pouring area of tundish after adding crescent–shaped blocks at the bottom of B-frame turbulence inhibitor.This caused the speed of molten steel in pouring area to the right of tundish is larger and then molten steel reached the right side of tundish faster.(3)The effect of the blades or crescent-shaped blocks of the turbulence inhibitors on the average residence time of molten steel,volumetric proportion of dead and plug-like zone of tundish was not obvious.(4)The poring flow would clash with reflux from the turbulence inhibitors with each other and then produce turbulent kinetic energy.The turbulent kinetic energy could translate into swirl kinetic energy by blades in A-frame turbulence inhibitor or crescent-shaped blocks in B-frame turbulence inhibitor.This could inhibit turbulent kinetic energy.(5)The blades of A-frame turbulence inhibitor could affect the reflux from the turbulence inhibitor,and caused the flow of molten steel above the turbulenceinhibitor asymmetrical.The crescent–shaped blocks of B-frame turbulence inhibitor could lead reflux spread to both sides.This could help keep molten steel surface more stable,and could not form slag eye easily.(6)The highest removal rate of small inclusion could increase 21.0% under the effect of swirl flow produced by the blades of A-frame turbulence inhibitor and the crescent–shaped blocks of B-frame turbulence inhibitor.