Experimental Research Of Rotational Flow Guide Device In Submerged Entry Nozzle

This research develops a new SEN. According to the water model study, when the steel flows through the nozzle, the kinetic energy of the flow is sufficiently utilized, and the flow fluid in mould is also improved. The results of the water model as follows:1)At the primitive conditions, when the bottom of the nozzle is convex and the SEN do not set the, the meniscus surface's fluctuation, the average wave of the surface and the flow impacting the mould's narrow wall are comparatively great. They are individually 0.15cm, 0.119cm and 0.202kpa.2) According to the results of the orthogonal analysis, the immersion depth has obvious effects on the meniscus surface's fluctuation, the average wave of the surface and the flow impacting the mould's narrow wall when the nozzle's bottom is convex. In general, when the immersion depth is get large, the above amounts are low, and the effects are obvious. Moreover, the rotation angle, the length, the setting height and the setting angle of the rotational flow guide device have also effects on the above amounts, but the rotation direction and the thickness of the rotational flow guide device have little effects on the above amounts.3) The bottom of the nozzle has obvious effects on the flow fluid in the mould. If other conditions were the same, among the three bottom of the nozzle, the convex bottom has the largest impact effects on the mould's narrow wall but it has the least wave of the surface. The concave bottom has the least impact effect on the mould's narrow wall but has the largest fluctuation of the surface. The flat bottom has the middle impact effects on the mould's narrow wall and the middle fluctuation of the surface.4) The bottom of SEN is concave and the preferred rotational flow guide device is B. The structure and the processing parameters of rotational flow guide device B areα=α4,L=1.875,H=0,d=d3,δ=δ2,左旋,β=0°. Compared with the experimental results of the primitive conditions, the impact effect on the mould's narrow wall reduced by 45.5%, and the meniscus surface's fluctuation reduced by 35.3%, the average wave of the surface reduced by 33.3%, and the penetration of the stream directed downwards reduced by 22.7%.