耦合物理场中包层的流动传热和结构安全分析  

Heat Transfer and Structural Analysis of Blanket Module in Coupled Fields

作　　者：李明健[1] 陈龙[1] 倪明玖[1] 张年梅[1] 

机构地区：[1]中国科学院大学物理学院,北京100190

出　　处：《工程热物理学报》2015年第6期1339-1344,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51376175);科技部ITER专项(No.2013GB114001)

摘　　要：包层结构是国际热核聚变实验堆(ITER)中的重要组件,它的力学行为与磁-热-流-固多物理场的耦合效应密切相关。本文采用有限体积法和有限元方法,分析了磁场强度和流体入口速度对包层内流动传热效应和包层中流道插件(FCI)结构安全性的影响。对磁场效应的分析表明,虽然MHD效应对流体存在不利影响,但磁场效应引起的M型速度分布改变了流体的传热形式,可以增加流体出口平均温度,提高热效率;同时,射流可降低第一壁最高温度,减小FCI最大结构热应力。此外,磁场效应还降低了FCI的热膨胀趋势,使得侧壁和Hartmann壁的法向位移有所减小。对于入口流速的分析表明,当速度增加时,PbLi流体出口平均温度降低,使其热效率降低,但流道向氦气中的热泄露有所减少,增加了出口输出热功率。当速度超过0.06 m/s时,出口热功率占中子生成热功率的比例将稳定在85%左右,同时考虑到第一壁和FCI的结构安全性,入口速度选择在0.06~0.10 m/s间可使包层达到良好的传热性能和安全性能。Blanket module is an indispensable part in ITER.Mechanical behaviors of this component are affected by magneto-thermo-fluid-structure coupled fields.In this work,numerical investigations based on finite volume method and finite element method were applied to analyze PbLi flow and temperature in the liquid blanket.Flow pattern,heat transfer and structural analysis were carried out.Results show that,despite leading to negative MHD effect,stronger magnetic field plays remarkable role in fluid flow and heat transfer.Average outlet temperature and thermal efficiency will be enhanced.Meanwhile,jet flow near hot side wall will decrease FW temperature and FCI thermal stresses.Thermal expansion of FCI will also be suppressed in magnetic field.Additionally,when inlet flow velocity increase,average outlet temperature and thermal efficiency will decrease.However,less heat leak into helium can be seen in this case,and outlet power will increase.When velocity is higher than 0.06 m/s,outlet fluid will bring about 85%heat that neutronic reaction generates in blanket.In conclusion,considering FW and FCI structural safety,inlet flow velocity should be between 0.06 m/s to 0.10 m/s.In this case,both higher heat transfer performance and structural safety can be achieved.

关 键 词：多物理场 流道插件 传热 热应力 

分 类 号：O361.3[理学—流体力学]