A Duct Design for Reducing Grad-B MHD Drag

IF 1.9 4区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Journal of Fusion Energy Pub Date : 2023-10-10 DOI:10.1007/s10894-023-00388-2

Michiya Shimada, Jabir Al Salami, Kazuaki Hanada, Changhong Hu

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引用次数: 0

Abstract

Harsh heat load conditions on plasma-facing components (PFCs) in steady-state and transient phenomena (e.g., disruptions and ELMs) in DEMO fusion reactors question the feasibility of current approaches based on solid targets made of tungsten. This issue calls for the development of innovative plasma-facing components. Liquid metal PFCs with strong convection enhance heat removal capability and resilience after the transient phenomena. However, transporting liquid metal across magnetic fields gives rise to MHD drag. MHD drag for the case of uniform B, estimated analytically, is acceptable. Grad-B MHD drags with straight ducts could seriously drag the LM flow across non-uniform B. Expanding the duct along B and shrinking the duct in a perpendicular direction could make electromotive force |vBh| approximately constant along the duct and significantly reduces the grad-B MHD drag. Here v denotes the flow velocity along the duct, B is the magnetic field strength, and h is the vertical duct size. Three-dimensional simulations for internal and free surface thermo-MHD phenomena have demonstrated that the proposed duct design reduces the total pressure drop along the duct.

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减少b级MHD阻力的风管设计

在DEMO聚变反应堆中，等离子体面组件(pfc)在稳态和瞬态现象(如中断和elm)下的恶劣热负荷条件，对当前基于钨制固体靶的方法的可行性提出了质疑。这一问题要求开发面向等离子体的创新组件。具有强对流特性的液态金属全氟化纤维增强了瞬态现象后的散热能力和回弹性。然而，在磁场中运输液态金属会产生MHD阻力。均匀B情况下的MHD阻力，分析估计是可以接受的。直管级-B型MHD阻力对LM气流在非均匀B上的阻力较大，沿B方向膨胀和垂直方向收缩可使电动势|vBh|沿B方向近似恒定，显著减小了梯度-B型MHD阻力。式中v为沿风道的流速，B为磁场强度，h为垂直风道尺寸。内部和自由表面热- mhd现象的三维模拟表明，所提出的风管设计降低了沿风管的总压降。

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来源期刊

Journal of Fusion Energy 工程技术-核科学技术

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews. This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.