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真空下钢液中气泡上浮行为的数值模拟
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摘要
本文以真空精炼过程中的底吹氩气泡为研究对象,通过建立CAE仿真模型,研究了在不同的真空压力条件下,钢液中单个氩气泡上升过程中形貌特征的变化,以及气泡上浮速度的变化。研究结果表明,随着真空压力的减小,氩气泡上浮体积膨胀比增大,而气泡上浮时间呈现先减少后增加的趋势。因此,在真空冶炼过程中,对于给定钢液条件和吹气条件,存在一个临界的真空操作压力,在该压力条件下氩气泡上浮时间最短,能够获得较好的搅拌效果。在本实验研究条件下,其临界操作压力值在5000pa左右。
This thesis focuses on blowing argon bubble in the process of vacuum refining.The CAE simulation model is established to study the changes of macroscopic features and floating velocity of single argon bubble in its rising process in liquid steel under different vacuum environments.The results show that with the decreasing of pressure,the expansion of argon bubble increases,while its floating time demonstrates a "U" shape tendency of reducing first and increasing later.Therefore,in the process of vacuum refining,for given molten steel and blowing conditions,there exists a critical operating pressure,under which the floating time of the argon bubble is the shortest and the best stirring effect can be got.Under the conditions-given in this research,the critical operating pressure is around 5000 pa.
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