The MTOR LM-MHD Flow Facility, and Preliminary Experimental Investigation of Thin Layer, Liquid Metal Flow in a 1/R Toroidal Magnetic Field
The MTOR LM-MHD Flow Facility, and Preliminary Experimental Investigation of Thin Layer, Liquid Metal Flow in a 1/R Toroidal Magnetic Field
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DOI：
10.13182/fst03-a313
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发表时间：
2003-07
影响因子：
0.9
通讯作者：
N. Morley;Jonathan Burris
中科院分区：
文献类型：
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作者：
N. Morley;Jonathan Burris
最近，一个新的实验自由表面液态金属MHD设备，所谓的MTOR设备，已经上线，并已采取了新的数据有关流动的镓合金通过一个中等强的环向磁场的特征1/R场梯度。这些实验的目的有两个方面：收集数据，用于对现有的一维和二维自由表面计算流动模型（以及目前正在开发的3D模型）进行基准测试，并调查模型未预测的现象，特别是喷嘴，排水，波浪和湍流的影响。数据的平均流高和波的结构，有和没有所谓的Zakharov磁推进电流增加，以帮助控制和稳定的流量有关的MHD效应。测试截面足够宽，使得特征因子（哈特曼数 * 纵横比）小于1。在这种情况下，哈特曼层阻力效应很小，可以将实验数据与二维轴对称模型进行比较。初步结论表明，在这些实验中的磁场梯度不会对表面的稳定性产生不利影响，并且磁推进电流在扁平化和加速液态金属流方面是有效的。
ABSTRACT Fairly recently, a new experimental free surface liquid metal MHD facility, the so-called MTOR facility, has come on-line, and new data has been taken concerning flows of gallium alloy across a moderately strong toroidal field with characteristic 1/R field gradient. The purpose of these experiments has been two-fold: to gather data for benchmarking currently existing one and two dimensional free surface computational flow models (as well as 3D models currently under development), and to investigate phenomena not predicted by models, especially effects of nozzles, drains, waves and turbulence. Data is presented concerning MHD effects on the mean flow height and wave structure, both with and without the so-called Zakharov magnetic propulsion current added to help control and stabilize the flow. The test section is wide enough so that the characteristic factor (Hartmann Number * Aspect Ratio) is less than unity. In this case the Hartmann layer drag effects are small, allowing comparison of experimental data to two-dimensional axisymmetric models. Preliminary conclusions suggest that the field gradient in these experiments does not adversely affect the stability of the surface, and that magnetic propulsion current is effective in flattening and accelerating the liquid metal flow.