中文摘要：

采用小块单元永磁体堆积的方式搭建了永磁螺旋磁场,并研究了其所驱动的金属液流动模式。首先,通过实验测量和数值模拟的方法分析了螺旋磁场的空间分布特点：螺旋磁场可视为由旋转磁场和行波磁场在空间上叠加而成;其次,实验测量和数值模拟的结果表明：理想螺旋磁体与采用单元永磁体堆积所形成的实际磁场的分布与强度较一致;最后,采用超声多普勒测速仪（UDV）对永磁螺旋磁场所驱动的金属液流进行了定量的速度测量研究,发现永磁螺旋磁场在一定参数条件下能驱动全域的螺旋流。

英文摘要：

An Archimedean helical magnetic field was constructed upon small permanent magnet units and the flow pattern of molten metal driven by helical magnetic field was researched. First, the distribution of helical magnetic field was analyzed by experimental measurements and numerical simulations： helical magnetic field could be considered as the superposition of rotating magnetic field and traveling magnetic field; second, the results of experimental measurement and numerical simulation show that the distribution and strength of magnetic field between the ideal helical magnets and actual magnets constructed upon permanent magnet units is consistent; finally, the velocity of molten metal flow driven by permanent magnet helical magnetic field was measured by Ultrosonic Doppler Velocimetry（UDV） quantitatively and the results indicate that the permanent magnet helical magnetic field can drive molten metal in a flow pattern of a global helical flow under certain experimental parameters.