配备螺旋形双壁管的 EU-DEMO 水冷铅锂孕育毯结构性能的数值研究

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2024-10-28 DOI:10.1016/j.fusengdes.2024.114703

J.A. Noguerón , P.A. Di Maio , G. Bongiovì , I. Catanzaro , P. Chiovaro , S. Giambrone , A. Quartararo , E. Vallone , I. Fernández-Berceruelo , P. Arena

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引用次数: 0

摘要

为了提高欧盟-DEMO增殖毯（BB）系统的性能，目前正在欧洲聚变活动中对参考设计的变体进行研究。其中，针对水冷铅锂（WCLL）育种毯概念，正在研究一种用于冷却育种区的新型双壁管（DWTs）布局。新的双壁管配置由 6 对螺旋形双壁管组成，每对双壁管都位于由径向波状加劲板（SP）确定的槽中。采用螺旋管布局可减少 BB 结构材料中的热热点，对热应力也有好处。结构评估是在各种加载情况下进行的，包括正常运行（NO）情况下的额定压力值和设计压力值，以及考虑到液体增殖器引起的浮力效应的正常运行情况下的额定压力值和设计压力值。所有这些情况都假定采用先前获得的相同热场来预测位移和应力场。随后，对结构的某些关键区域进行了应力线性化处理，从而将获得的应力值与参考设计标准 RCC-MRx 规定的标准进行比较。从应力和位移的角度来看，这一评估的结果似乎很有希望。然而，在管道中发现了一些接触区域，这就需要在今后的分析中仔细考虑几何形状的修改。尽管如此，所获得的结果清楚地表明，建议的布局值得进一步评估。我们采用了基于有限元法（FEM）的理论-数值方法，并使用了 Ansys 商业代码。

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Numerical investigation of the structural performances of the EU-DEMO Water-Cooled Lead Lithium breeding blanket equipped with helicoidal double-walled tubes

With the aim of improving the EU-DEMO breeding blanket (BB) system performances, variants to the reference design are presently under investigation in the EUROfusion activities. Among them, a novel layout for the double-walled tubes (DWTs) aimed at cooling the breeding zone is being studied for the Water-Cooled Lead Lithium (WCLL) BB concept. The new DWTs configuration consists of 6 couples of helical-shaped DWTs, with each tubes couple being positioned in a slot defined by the radial-poloidal stiffening plates (SPs). The adoption of the helicoidal tubes layout shall allow reducing the thermal hotspots in the BB structural material, being beneficial also in terms of thermal stress. Hence, a structural analysis of the equatorial region of the WCLL BB central outboard blanket segment has been performed and presented in this work.

The structural assessment has been conducted under various loading scenarios, including Normal Operation (NO), with nominal and design pressure values, and NO scenario considering buoyancy effects induced by the liquid breeder. All these scenarios assumed the same previously obtained thermal field to predict displacements and stress fields. Subsequently, a stress linearization procedure has been performed in some critical regions of the structure, which allows comparing the stress values obtained with the criteria prescribed by the reference design standard RCC-MRx. The outcomes derived from this evaluation, in terms of stresses and displacements, seem very promising. However, some contact regions have been identified in the tubes, necessitating careful consideration of geometric modifications in future analyses. Nevertheless, the obtained results clearly show that the proposed layout is worthy to be further assessed. A theoretical–numerical approach based on the Finite Element Method (FEM) was followed adopting the Ansys commercial code.

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.