依据相似性原理采用1:1比例搭建双辊薄带铸轧水模型试验平台,研究了不同铸速对铸轧熔池流动规律的影响,并建立低雷诺数的湍流数学模型,对熔池内流场和温度场分布规律进行分析.研究结果表明,由于液体的黏性力和轧辊的挤压作用,在熔池芯部区域会产生回流现象.芯部回流可在一定程度上搅动熔池并促使芯部温度降低,有利于促使温度场和溶质场均匀稳定.研究还表明,随着铸轧速度的增加,回流区位置下移且回流区面积增大,回流作用增强.但过大的铸轧速度反而会使液面波动加剧、Kiss点位置过低等问题产生,从而影响产品质量.
According to the similarity principle,a water model experiment platform for Twin-roll strip casting was set up by 1:1,then the influence of casting speed on the flow of molten pool has been studied,and a low-Reynolds-number tur-bulence mathematic model was developed to study the flow field and the temperature field of the molten pool. The results showed that the backflow occurred at the center region of molten pool by the effects of fluid viscosity and the rollers extru-sion. The center region backflow would stir the molten pool and reduce the temperature to some extent which would make the temperature field and solute field uniform and steady. With the casting speed increased,the location of backflow would move down,the area of backflow zone would enlarge,and the effect of backflow would enhance. However,rapid casting speed would exacerbate the fluid level fluctuation or decrease the location of Kiss point excessively,which can affect the production quality.
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