脉冲磁场驱动液态金属变形的作用机理研究

Mechanism of Deformation of Liquid Metal Driven by Pulsed Magnetic Field

为掌握脉冲电磁场驱动液态金属变形的作用机理,采用数值仿真方法,建立了线圈与液态金属的有限元模型,分析了电磁场作用下液态金属表面及内部的磁场强度、感应电流及电磁力随时间的变化规律,研究了液态金属凸起和凹陷部分的变形量。结果表明:液态金属中的磁感应强度、感应电流密度和电磁力密度分布均呈现明显趋肤效应,使得凸起部分的感应电流密度、磁感应强度及电磁力密度均大于凹陷部分的对应值;凸起和凹陷部分的电磁压力差驱动液态金属发生变形,使液态金属的直径更加均匀。

In order to understand the mechanism of deformation of liquid metal driven by pulsed electromagnetic field,a finite element model of coil and liquid metal was established by numerical simulation method.The variation of magnetic field strength,induced current and electromagnetic force on the surface and inside of liquid metal under electromagnetic field was analyzed,and the deformation of liquid metal protrusion and concave part was studied.The results show that the distribution of magnetic induction intensity,induced current density and electromagnetic force density in liquid metals show obvious skin effect,which makes the induction current density,magnetic induction intensity and electromagnetic force density in the bulge part larger than the corresponding value in the depression part;The electromagnetic pressure difference between the convex and concave parts drives the liquid metal to deform,making the diameter of the liquid metal more uniform.