中国激光, 2015, 42 (2): 0202007, 网络出版: 2015-01-20   

电磁搅拌作用下激光熔池电磁场、温度场和流场的数值模拟

Numerical Simulation of Electromagnetic flow, Temperature Field and Flow Field in Laser Molten Pool with Electromagnetic Stirring
作者单位
沈阳航空航天大学航空制造工艺数字化国防重点学科实验室, 辽宁 沈阳 110136
摘要
建立了描述电磁搅拌辅助激光熔凝过程的电磁场和流场的三维数学模型,采用有限元和有限体积结合的方法实现激光熔池中电磁场与温度场及流场的耦合模拟分析,研究了电磁场对激光熔池流场与温度场的影响。结果表明,电磁力在水平面上呈周向分布,切向电磁力的大小从熔池边缘到中心递减;在旋转磁场的作用下,熔池内温度略有降低,温度梯度减小;熔池内液体趋向旋转运动,速度场分布与电磁力相似;熔池纵向环流增加,使熔池内的熔体对流加剧,有利于传热,加快冷却;激励电流大小对电磁场和熔池流场有明显影响。为激光加工提供理论参考。
Abstract
A new three-dimensional mathematical model describing the electromagnetic stirring in the laser remelting is developed. The method combining the finite element and finite volume is used to deal with coupling electromagnetic field with flow field and temperature field. The influence of electromagnetic field on temperature field and flow field are analyzed. The results show that the electromagnetic force is distributed circumferentially at horizontal plane, the magnitude of the tangential force decreases from edge to center; Under the effect of rotating magnetic field, the temperature and temperature gradient in the molten pool are slightly reduced; Liquid in the molten pool tends to rotary motion, it is similar that the distribution of velocity field and electromagnetic force; The circulation in the longitudinal of molten pool increases, which is benefit for heat transfer of molten pool and accelerates cooling speed; The distributions of electromagnetic field and flow field are affected by the intensity of exciting current. It provides the theoretical reference for laser processing.

王维, 刘奇, 杨光钦, 兰云, 薛雄. 电磁搅拌作用下激光熔池电磁场、温度场和流场的数值模拟[J]. 中国激光, 2015, 42(2): 0202007. Wang Wei, Liu Qi, Yang Guang, Qin Lanyun, Xue Xiong. Numerical Simulation of Electromagnetic flow, Temperature Field and Flow Field in Laser Molten Pool with Electromagnetic Stirring[J]. Chinese Journal of Lasers, 2015, 42(2): 0202007.

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