聚变堆液态第一壁膜流MHD流动
及其稳定性机制研究

摘要/Abstract

摘要： 建立了液态金属膜流MHD流动的数学物理模型，开发了相关数值模拟程序。首先，通过相关实验结果对该程序进行了校验。然后，对液态金属锂膜流在横向强磁场中的MHD流动进行了模拟，给出了入口流速、入口膜厚、底壁宽度、壁面粗糙度对其MHD流动的影响。模拟结果表明，存在唯一入口流速和唯一底壁宽度使得膜流MHD流动稳定；存在两个入口膜厚值使得膜流MHD流动稳定；壁面粗糙度对膜流MHD流动影响较小。最后，通过膜流MHD流动平衡分析，初步给出了其MHD稳定性的物理机制。分析结果表明，增加底壁宽度有利于降低电磁阻力，增加膜流的MHD稳定性；膜流的稳定流速随入口膜厚的增加先增大后减小，同时其最大稳定流速值相对于无磁场的情况减小很多。

关键词: 液态第一壁, 液态金属, 膜流, MHD流动, MHD稳定性

Abstract: A mathematical and physical modeling of the liquid metal MHD film flow has been built and a related numerical code has been developed. Firstly, the code is validated by the related experimental results. Secondly, numerical simulation of the liquid metal MHD film flow is carried out by this code. The effects of the inlet velocity, the initial film thickness, the width of the bottom wall and the wall roughness on the flow state are presented. It is indicated that there is only one value of the inlet velocity and the substrate width when the film flow state is stable, and two initial film thickness values exist at the stable state, the wall roughness has little effect on the film flow state. In the end, the preliminary stable mechanism of the film MHD flow based on a equilibrium analysis is described, it is indicated that the increase of the substrate width is helpful to reduce the electromagnetic resistance and increase the MHD stability; the stable velocity firstly increases then decreases with the increase of the initial film thickness and it is greatly reduced compared to the no magnetic field case.

Key words: Liquid first wall, Liquid metal, Film flow, MHD flow, MHD stability

中图分类号:

TL334
TL62+7

张秀杰，潘传杰，许增裕. 聚变堆液态第一壁膜流MHD流动及其稳定性机制研究[J]. 核聚变与等离子体物理, 2013, 33(4): 289-296.

ZHANG Xiu-jie, PAN Chuan-jie, XU Zeng-yu. Liquid metal MHD film flow and its stability mechanism for the liquid first wall of fusion reactor[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2013, 33(4): 289-296.

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