Exploratory studies of flowing liquid metal divertor options for fusion-relevant magnetic fields in the MTOR facility
Exploratory studies of flowing liquid metal divertor options for fusion-relevant magnetic fields in the MTOR facility
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DOI：
10.1016/j.fusengdes.2004.07.004
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发表时间：
2004-11
影响因子：
1.7
通讯作者：
A. Ying;M. Abdou;N. Morley;T. Sketchley;R. Woolley;J. Burris;R. Kaita;P. Fogarty;H. Huang-
中科院分区：
文献类型：
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作者：
A. Ying;M. Abdou;N. Morley;T. Sketchley;R. Woolley;J. Burris;R. Kaita;P. Fogarty;H. Huang-
本文报道了液态金属自由表面流过复杂磁场的实验结果。实验涉及使用GaInSn的射流和膜流，并在UCLA MTOR设施进行。本研究的目的是了解磁流体动力学（MHD）功能与这样的自由表面流在融合相关的磁场环境，并确定LM自由表面流的选择是最适合的锂偏滤器粒子泵和表面热去除应用在近期的实验等离子体装置，如NSTX。实验结果表明，一个稳定的横向磁场，即使有梯度典型的NSTX外偏滤器条件，稳定LM射流减少湍流扰动和延迟射流破碎。对液态金属薄膜在NSTX环境下的磁流体动力学行为也有重要的认识。尽管在模拟的NSTX磁场条件下，流动所经历的MHD阻力可能很强并导致流动堆积，但可以在导电基底上建立上坡液态金属膜流。磁场改变了湍流膜流，使得波结构的范围从高磁场区域处的2D柱状表面扰动到外侧低场强区域处的普通流体动力学湍流波结构。还提出了今后工作的计划。
This paper reports on experimental findings on liquid metal (LM) free surface flows crossing complex magnetic fields. The experiments involve jet and film flows using GaInSn and are conducted at the UCLA MTOR facility. The goal of this study is to understand the magnetohydrodynamics (MHD) features associated with such a free surface flow in a fusion-relevant magnetic field environment, and determine what LM free surface flow option is most suitable for lithium divertor particle pumping and surface heat removal applications in a near-term experimental plasma device, such as NSTX. Experimental findings indicate that a steady transverse magnetic field, even with gradients typical of NSTX outer divertor conditions, stabilizes a LM jet flow—reducing turbulent disturbances and delaying jet breakup. Important insights into the MHD behavior of liquid metal films under NSTX-like environments are also presented. It is possible to establish an uphill liquid metal film flow on a conducting substrate, although the MHD drag experienced by the flow could be strong and cause the flow to pile-up under simulated NSTX magnetic field conditions. The magnetic field changes the turbulent film flow so that wave structures range from 2D column-type surface disturbances at regions of high magnetic field, to ordinary hydrodynamic turbulence wave structures at regions of low field strength at the outboard. Plans for future work are also presented.