包层模块几何特征对MHD流动和流道插件力学行为的影响  

Impacts of geometrical characteristics on MHD flow and mechanical behaviors of FCI in blanket modules

作　　者：李明健 陈龙 张哲妍 倪明玖 张年梅 LI MingJian;CHEN Long;ZHANG ZheYan;NI MingJiu;ZHANG NianMei(School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Qiushi Honors College,Tianjin University,Tianjin 300350,China)

机构地区：[1]中国科学院大学工程科学学院,北京100190 [2]天津大学求是学部,天津300350

出　　处：《中国科学：技术科学》2019年第10期1186-1196,共11页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2017YFE0301300);国家自然科学基金(批准号:51776194和51376175)资助项目

摘　　要：在国际热核聚变反应堆中,液态包层是能量转换的关键部件,位于包层模块内的流道插件(FCI)的主要作用是绝缘和绝热,流道插件的几何尺寸对包层内MHD流动特性、传热性能和结构安全性有很大影响.本文应用相容守恒格式的有限体积法分析磁场作用下金属流体的流动行为和温度场特点,并采用顺序耦合的方式,用有限元方法分析流场和温度场对结构的应力应变产生的影响.详细研究了流道插件厚度和间隙区宽度对MHD流动传热的作用,并引入无量纲数定量分析包层的传热效率.研究结果表明,插件厚度和间隙区宽度非线性、非单调地影响着传热效率、MHD压降、第一壁温度和流道插件的热应力.通过对大量计算数据的分析,本文建立了MHD压降与间隙区宽度的关联式;综合热效率、压降、第一壁温度和结构热应力作用,推荐了包层结构设计方案.本文为包层模块的优化设计提供了理论基础.Flow channel insert(FCI) serves as thermal and electrical insulator in the blanket module in the international thermonuclear experimental reactor(ITER). The geometrical characteristics of FCI greatly affect magneto-hydrodynamics(MHD) features, heat transfer and structural safety of the system. In this paper, the MHD flow and heat transfer in blanket modules with different FCI thicknesses and gap widths are investigated. Finite element method and finite volume method with a consistent and conservative scheme are used to deal with the magneto-thermo-fluid-mechanical fields. The detailed flow behaviors of metal fluid, thermal and mechanical behaviors in coupled field are investigated. A dimensionless parameter is introduced to evaluate the heat transfer efficiency. Results indicate the complicated effects of FCI thickness and gap width on heat transfer efficiency, pressure drop, first wall temperature and FCI thermal stress. The nonlinear and non-monotonous influences of geometrical characteristics on structural behavior and heat transfer efficiency are presented. The correlation between pressure drops and gap width is presented. After detailed analysis, a most promising design is recommended by evaluating heat transfer efficiency, fluid pressure drop, first wall temperature and structural stress. This work can be regarded as a foundation of future design and optimization of blanket modules.

关 键 词：多物理耦合场 包层模块 MHD 传热 热应力 

分 类 号：TP[自动化与计算机技术]