(大连理工大学 三束材料改性国家重点实验室材料科学与工程学院，大连 116023)
摘 要: 对自行研制的电磁搅拌器中金属液的电磁场和流场进行数值模拟，并进行实验验证。结果表明：在旋转磁场搅拌器作用下，金属液中除存在横截面上的旋转离心流动外，还存在着纵向的大环流，但二者速度不同，前者比后者高出一个数量级；金属液表面的磁感应强度B0与电流频率成反比，与输入的电压成正比；金属液所受电磁力的最大值与磁感应强度B0的平方成正比，与频率的n次方成反比，其中1/2≤n≤3/2；n与金属液的电阻率有关，电阻率越小则n越小；对于纯铝n为1/2，对于纯锡和纯铅n为1；金属液的转速与磁感应强度B0成正比，与金属液密度的平方根成反比。
关键字: 金属液；旋转电磁场；流动；数值模拟
magnetic field
（State Key Laboratory of Materials Modification by Laser,Ion and Electron Beams, School of Materials Science and Engineering,Dalian University of Technology, Dalian 116023, China）
Abstract:The couple field of electromagnetic force and flow was simulated for the self-developed rotating electromagnetic stirring equipment. The results show that under the stirring electromagnetic field, not only rotating flow exists in the cross section but also circulation flow exists in the vertical section of molten metal. The velocity of circulation flow is one order lesser than that of the rotating flow. The magnetic flux density of liquid metal surface (B0) is in inverse proportion to the current frequency whereas is in direct proportion to the input volt/current. The maximum electromagnetic force is in direct proportion to the square of magnetic flux density (B0) whereas is in inverse proportion to the nth-power of current frequency. n is relative to the electric resistance of molten metal and varies from 1/2 to 3/2, which is 1/2 for aluminum metal and 1 for tin metal and lead metal. The rotating velocity of molten metal is in direct proportion to the magnetic flux density (B0) and is in inverse proportion to the square root of the density of molten metal.
Key words: molten metal; rotating magnetic field; flow field; mathematical simulation
