3D numerical study of pressure equalization in MHD flow in a rectangular duct with insulating flow channel insert
3D numerical study of pressure equalization in MHD flow in a rectangular duct with insulating flow channel insert
复制标题
DOI：
10.1016/j.fusengdes.2014.01.076
复制
发表时间：
2014-10
影响因子：
1.7
通讯作者：
D. Sutevski;S. Smolentsev;M. Abdou
中科院分区：
文献类型：
--
作者：
D. Sutevski;S. Smolentsev;M. Abdou
由碳化硅（SiC）复合材料或泡沫制成的流道插入件（FCI）是双冷却剂铅锂（DCLL）包层概念的关键要素。FCI壁中的压力平衡开口旨在平衡FCI箱内的整体流动与FCI和外部铁素体钢管之间的薄间隙中流动的液态金属（LM）中可能存在的压力差，从而降低机械应力FCI中。在本研究中，MHD流动和相关的压力均衡效果进行了模拟与三维数值代码。已经确定和研究了两种压力均衡机制：一种是由于LM流通过流量均衡槽，另一种是由于感应电流流过非理想绝缘FCI壁。与纯流体动力学机制相比，第二种效果似乎占主导地位，并提供了更有效的压力均衡方式。已进行参数研究，以解决的FCI电导率，槽的大小，和管道长度的影响。最后，对FCI设计提出了建议，以实现更有效的压力均衡。
A flow channel insert (FCI) made of a Silicon Carbide (SiC) composite or foam is the key element of the dual-coolant lead-lithium (DCLL) blanket concept. Pressure equalization openings in the FCI wall are designed to equalize possible pressure differences in the flowing liquid metal (LM) between the bulk flow inside the FCI box and that in the thin gap between the FCI and the outer ferritic steel duct, thus reducing the mechanical stress in the FCI. In the present study, the MHD flow and associated pressure equalization effects are simulated with a numerical code in 3D. Two pressure equalization mechanisms have been identified and studied: one is due to LM flow through the flow equalization slot, and the other is due to induced electric currents flowing across the non-ideally insulating FCI wall. The second effect appears to both dominate and provide a more effective way of pressure equalization compared to the purely hydrodynamic mechanism. Parametric studies have been performed to address the impact of the FCI electrical conductivity, slot size, and the duct length. Finally, recommendations on the FCI design are proposed to result in more effective pressure equalization.