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Preliminary experimental study on applicability of Lorentz force velocimetry in an external magnetic field

Nuclear Science and Techniques 2018年第6期29卷 28-35页

作者： Yan-Qing Tan Run-Cong Liu Shang-Jun Dai Xiao-Dong Wang Ming-Jiu Ni Juan-Cheng Yang nataliia dubovikova Yurii Kolesnikov Christian Karcher College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences The Fifth Electronics Research Institute Ministry of Industry and Information Technology School of Engineering Science University of Chinese Academy of Sciences Institute of Thermodynamics and Fluid Mechanics Ilmenau University of Technology

Lorentz force velocimetry(LFV) is a noncontact technique for measuring electrically conducting fluids based on the principle of electromagnetic induction. This work aims to answer the open and essential question of whether LFV can work properly under a surrounding external magnetic field(ExMF). Two types of Ex MFs with different magnetic intensities were examined: a magnetic field with a typical order of 0.4 T generated by a permanent magnet(PM) and another generated by an electromagnet(EM) on the order of 2 T. Two forces, including the magnetostatic force between the Ex MF and PM in the LFV, and the Lorentz force generated by the PM in LFV were measured and analyzed in the experiment. In addition,Ex MFs of varying strengths were added to the LFV, and the location of the LFV device in the iron cores of the EM was considered. The experimental outcomes demonstrate that it is possible for a LFV device to operate normally under a moderate Ex MF. However, the magnetostatic force will account for a high proportion of the measured force,thus inhibiting the normal LFV operation, if the Ex MF is too high.

关键词： Lorentz 外部磁场试验性适用性学习设备操作永久磁铁测量基

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