Two-phase sink vortex suction mechanism and penetration dynamic characteristics in ladle teeming process

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Da-peng Tan, Ye-sha Ni, Li-bin Zhang
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引用次数: 37

Abstract

At the late stage of continuous casting (CC) ladle teeming, sink vortex can suck the liquid slag into tundish, and cause negative influences on the cleanliness of molten steel. To address this issue, a two-phase fluid mechanical modeling method for ladle teeming was proposed. Firstly, a dynamic model for vortex suction process was built, and the profiles of vortex flow field were acquired. Then, based on the level set method (LSM), a two-phase 3D interface coupling model for slag entrapment was built. Finally, in combination with high-order essentially non-oscillatory (ENO) and total variation diminishing (TVD) methods, a LSM-based numerical solution method was proposed to obtain the 3D coupling evolution regularities in vortex suction process. Numerical results show that the vortex with higher kinetic energy can form an expanded sandglass-shape region with larger slag fraction and lower rotating velocity; there is a pressure oscillation phenomenon at the vortex penetration state, which is caused by the energy shock of two-phase vortex penetration coupling.

钢包充液过程中两相沉降涡吸机理及侵彻动态特性
连铸钢包充液后期,熔池涡会将液渣吸入中间包,对钢水清洁度产生不利影响。针对这一问题,提出了钢包充液过程的两相流体力学建模方法。首先,建立了涡吸过程的动力学模型,得到了涡吸过程的流场分布;然后,基于水平集法(LSM),建立了夹渣两相三维界面耦合模型。最后,结合高阶本质非振荡法(ENO)和总变差递减法(TVD),提出了一种基于lsm的涡吸过程三维耦合演化规律数值求解方法。数值结果表明,高动能涡流在较大的渣率和较低的转速下可形成膨胀的沙漏形区域;涡侵彻状态下存在压力振荡现象,这是由两相涡侵彻耦合的能量冲击引起的。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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