论文部分内容阅读
超导磁悬浮列车是高温超导块材最有前景的应用之一.磁悬浮列车系统要求高温超导块材处于超导状态,因此在磁悬浮列车运行过程中,车载高温超导块材始终被浸泡在温度为77K的液氮容器中.当运行一段时间液氮将被耗尽时,,为防止超导块材失超,需要向液氮容器补充液氮.由于受空气中水蒸汽的影响,在补充液氮的过程中很容易在超导块材的外表面形成结冰现象.块材表面的冰层不利于块材和液氮的热交换,甚至有可能对交流磁场下块材的导向力性能产生影响.在本论文中,实验研究了块材表面覆盖的冰层对高温超导磁悬浮列车系统中到向力性能的影响情况.实验结果表明:和未被冰层覆盖的块材相比,在相同交流磁场影响下的磁悬浮列车系统中,覆盖有冰层的超导块材的导向力衰减更明显.因此,在高温超导磁悬浮列车系统中,为防止导向力的急剧衰减,应该尽量避免车载高温超导块材外表面被冰层覆盖.
Superconducting maglev train is one of the most promising applications of high-temperature superconducting block material.Magnetic levitation train system requires high-temperature superconducting block material in the superconducting state, so in the process of maglev train running, the vehicle high temperature superconducting block material is always immersed in Temperature 77K liquid nitrogen container when running liquid nitrogen will be depleted, in order to prevent the superconducting block quench, liquid nitrogen container needs to be supplemented by liquid nitrogen due to the impact of water vapor in the air at It is easy to form icing on the outer surface of the superconducting block during the process of replenishing liquid nitrogen.The ice layer on the surface of the block is not conducive to the heat exchange between the block and the liquid nitrogen and may even cause the block orientation in the AC magnetic field In this paper, the effect of the ice layer covered by the block surface on the HTF performance of the HTS maglev system was experimentally studied.The experimental results show that compared with the non-ice-covered block , The magnetic induction system under the influence of the same AC magnetic field, the superconducting block covered with ice layer attenuation of the guidance force is more obvious.Therefore, in the high temperature superconducting magnetic suspension train system, in order to prevent the steep decline of the steering force should be as much as possible avoid The outer surface of the carrier material is a high temperature superconductor is covered with ice.