利用LES研究A-FNS Li靶内的涡结构及湍流换热机理

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

Fusion Engineering and Design Pub Date : 2025-05-03 DOI:10.1016/j.fusengdes.2025.115136

Daichi Hagari, Takafumi Okita, Eiji Hoashi

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引用次数: 0

摘要

计划将液态锂射流用作聚变中子源（FNSs）的束靶。目前，根据日本和欧盟从IFMIF/EVEDA获得的经验，日本正在将fns开发为A-FNS，欧盟正在将IFMIF- doones开发为IFMIF- doones。为了保证FNSs的稳定高效运行，需要明确Li射流的流动特性和传热机理。利用大阪大学的Li Loop （LLOU）和EVEDA Li Test Loop （ELTL）研究了Li流动特性。然而，在实验上很难解释李氏射流在射靶过程中的传热现象。因此，有必要利用CFD模拟对这些现象进行评估，以进行此类设施的安全性分析。在本研究中，采用简化的热源模型，首先以单相流的形式对Li靶进行了大涡模拟（LES）计算。结果表明：喷嘴出口处形成Görtler涡旋，一直发展到光束辐照中心；此外，我们澄清了与旋涡脱离后壁相关的速度波动每秒发生两次。传热计算表明，这些涡旋扰动了光束能量沉积引起的温度场，使光束能量峰值附近的温度比周围温度降低了40℃。

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Study of vortex structure and turbulent heat transfer mechanism in A-FNS Li target using LES

A liquid lithium (Li) jet is planned to be used as a beam target of the Fusion Neutron Sources (FNSs). FNSs are currently being developed as A-FNS in Japan and IFMIF-DONES in EU, based on the experience gained from IFMIF/EVEDA in both Japan and EU. The flow characteristics and heat transfer mechanisms of the Li jet need to be clarified to ensure the stable and efficient operation of FNSs. Li flow characteristics have been studied using Li Loop of Osaka University (LLOU) and EVEDA Li Test Loop (ELTL). However, it is difficult to experimentally elucidate heat transfer phenomena inside the Li jet during beam-on-target operation. Therefore, it is desirable to evaluate these phenomena using CFD simulation for the safety analysis of such facility. In this study, Large Eddy Simulation (LES) calculations of the Li target with heat transfer due to beam irradiation were first performed as a single-phase flow, incorporating a simplified heat source model. The results showed that a Görtler vortex generated at the nozzle exit developed up to the center of the beam irradiation. Furthermore, we clarified that velocity fluctuations associated with the detachment of the vortex from the back wall occurred twice per second. Heat transfer calculations revealed that such vortices disturbed the temperature field caused by beam energy deposition and lowered the temperature by 40 °C compared to the surrounding temperature near the peak region of the beam energy.

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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.