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利用欧拉模型和多参考坐标系法对旋转喷吹除气箱中的气液两相流场进行数值模拟,提出基于计算域的选取获取自由液面波动的建模方法,并考察了不同因素对除气箱内气液两相流动行为产生的影响。结果表明,提出的获取自由液面波动的建模方法是可行的。随气泡直径的减小、搅拌转速的增加,气体在除气箱中停留时间延长,与铝熔体接触面积增大,气体在除气箱中的分布得到改善,有利于铝熔体的净化。此外,采用圆柱形除气箱,气体大多聚集在转杆周围,且易发生打漩现象,这对铝熔体的除氢不利。
The Eulerian model and the multi-reference coordinate system are used to numerically simulate the gas-liquid two-phase flow field in the rotating injection degassing box. The modeling method based on the calculation domain is proposed to obtain the free-surface fluctuation and the effects of different factors On the degassing tank gas and liquid two-phase flow behavior. The results show that the proposed modeling method to obtain free-surface fluctuation is feasible. With the decrease of bubble diameter, increase of stirring speed, the residence time of gas in degassing tank is prolonged, the contact area with aluminum melt is increased, the distribution of gas in degassing tank is improved, which is benefit to the purification of aluminum melt. In addition, the use of cylindrical degassing box, most of the gas gathered around the rod, and prone to swirling phenomenon, which detrimental to the dehydrogenation of aluminum melt.