Numerical and experimental research to solve MHD problem in liquid blanket system
Numerical and experimental research to solve MHD problem in liquid blanket system
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DOI：
10.1016/j.fusengdes.2005.08.086
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发表时间：
2006-02
影响因子：
1.7
通讯作者：
H. Hashizume
中科院分区：
文献类型：
--
作者：
H. Hashizume
讨论了聚变堆自冷液体包层系统的热流体研究问题，以期找到实现该系统的途径。本文选用液态Li和Flibe熔盐作为包层冷却剂。对于Li包层系统，采用具有多层结构的三面涂覆沟道具有一定的克服MHD问题的可能性。在最内层金属层所需的导电性方面的材料特性似乎可以与涂层材料作为最内层薄层的结构组件的新概念一起实现。在Flibe冷却剂的情况下，显示出非常小的MHD压降，电解产生氟和氚。数值结果表明，通过优化沟道的几何形状可以抑制这种电解作用。数值计算和实验结果表明，当气流速度较小时，卵石床可以起到强化换热的作用，从而减小MHD效应。
Thermofluid research issues relating to self-cooling liquid blanket system for fusion reactors are discussed to find ways to realize the system. In this paper, liquid Li and Flibe molten salt are chosen as the blanket coolants. For the Li blanket system, there exists some possibility to overcome MHD problem by using three-surface coated channel with multi-layer structure. The material properties in terms of electrical conductivity required for the innermost metal layer seems achievable together with new concept that the coated material works as the structural component of the innermost thin layer. In the case of Flibe coolant, which shows very small MHD pressure drop, electrolysis occurs to result in generation of fluorine and tritium. The numerical results show that this electrolysis can be suppressed by optimizing the channel geometry. Numerical and experimental results indicate that heat transfer enhancement using pebble beds is expected when the flow velocity is relatively small to reduce the MHD effect.