ADS无窗散裂靶中两相流动和腐蚀问题研究

项目名称： ADS无窗散裂靶中两相流动和腐蚀问题研究

项目编号： No.51276190

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 刘捷

作者单位： 中国科学院大学

项目金额： 76万元

中文摘要： 散裂靶在加速器驱动次临界堆系统中连接加速器和反应堆，是核心装置。液态重金属铅铋合金在无窗散裂靶中流动过程包含多相流和传热传质科学问题，主要有与蒸汽间含气蚀相变的自由界面精确捕获、对极大功率密度体积热源的湍流输运、强中子辐照下在结构钢材料中腐蚀的扩散传质过程等，这些都是关系到系统能否长期、稳定、安全运行的关键工程热物理科学问题。针对这些问题，本项目拟开展两相大物性比、含相变的高效精确界面捕获算法及常温液态金属验证性模拟实验研究，高温、低Pr数金属流体湍流对极大功率密度体积热的输运模拟，强辐照下铅铋与结构钢原子互扩散及其演化过程的微尺度和多尺度耦合算法研究等。预期发展相关算法与软件，获得相关过程的新知识、新规律，深入认识影响系统运行的关键因素，丰富多相流、金属流体力学和微尺度传热传质等学科知识，并为我国加速器驱动次临界堆散裂靶的设计、优化和研制提供理论依据，因此具有重要学术价值和重大应用前景。

中文关键词： 无窗散裂靶；多相流动；热输运；铅铋合金；腐蚀

英文摘要： The windowless spallation target is at the 'heart' of the accelerator driven system (ADS) which connects the proton accelerator and the subcritical reactor core. The heavy liquid metal (HLM) lead-bismuth eutectic is not only intended to serve as target material for the spallation reaction but also as coolant in the target. Typical scientific multiphase flow and heat and mass transfer problems during the liquid lead-bismuth eutectic flowing process, such as accurate capturing of the two phase free interface between HLM and its vapor with cavitation, turbulent transferring of the extreme large power density of volumetric heat sources at high temperature, the diffusive mass transfer to the structural steel resulting in corrosion and erosion under irradiation of the intense neutron field, require comprehensive study. All these important issues which belong to the engineering thermophysics research field determine whether the ADS can operate in the long-term, stable and safe condition. Accordingly, more accurate　volume of fluid(VOF) interface capturing method with larger ratio between the two phases' thermophysical properties including the phase change (containing experimental verification on the liquid metal GaInSn at normal temperature) and HLM turbulent transferring of the extreme large power density of volumetric

英文关键词： Windowless Spallation Target；multiphase flow；heat transfer；lead-bismuth eutectic；corrosion