惯性约束聚变靶丸内杂质气体抽空流洗过程的数值模拟  

Numerical simulation of filling and evacuating process of impurity gas in target capsule of inertial confinement fusion

作　　者：邹雄 漆小波[2] 张涛先 高章帆 黄卫星[1] Zou Xiong;Qi Xiao-Bo;Zhang Tao-Xian;Gao Zhang-Fan;Huang Wei-Xing(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]四川大学化学工程学院,成都610065 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《物理学报》2021年第7期259-266,共8页Acta Physica Sinica

摘　　要：低温冷冻靶是实现惯性约束聚变(inertial confinement fusion,ICF)的关键部件之一.低温靶靶丸内杂质气体的去除程度和效率对低温靶燃料冰层的在线制备具有重要意义.依据低温靶物理对冰层杂质含量的设计要求,在计算靶丸内杂质气体最大允许分压的基础上,建立了靶丸内气体在微米级充气管内流动的抽空流洗模型.模拟研究了不同微管尺度及结构、温度对靶丸内杂质气体抽空流洗效率的影响规律,获得了靶丸充气微管的最佳管型设计方案.基于最佳管型设计,优化得到了具有最高抽空流洗效率的抽空时间与流洗次数组合策略.Cryogenic target is one of the key components of inertial confinement fusion.The removal degree and efficiency of impurity gas in cryogenic target are of great significance to the on-line preparation of ice layer for cryogenic target fuel.According to the design requirements of cryogenic target physics for impurity content in ice layer,the influence factors of upper limit of partial pressure are analyzed,based on the derivation of the calculation formula of maximum allowable partial pressure of impurity gas in the target.Then the flow field of air and hydrogen in microchannels is investigated,and the filling and evacuation model of gas flow in a microscaled filling tube is established.The dynamic simulations of microtubules with different lengths and diameters are carried out.The results show that the microtubules with a length of 5 mm could save 80%of the time compared with the microtubules of 50 mm in length when the microtubule is 5μm in diameter.At the same time,the total flow washing time decreases by 46%when the diameter of 2μm is doubled under the condition of 20-mm-long microtubule.Considering the requirements for efficiency and fusion stability,four kinds of tubes are proposed and simulated.The results indicate that the conical transition tube has a strong flow capacity and high flow evacuation efficiency,and is suitable for use as a filling microtubule.On the basis of the best tube shape,the comparison between the two processes under different intermediate pressures is carried out with the time and number of filling and evacuating serving as evaluation criterion.Ultimately,the intermediate pressure of 52000 Pa is selected,the total number of evacuation is 10 and the time is 758 s.Finally,the effect of temperature on the evacuation efficiency is studied in a temperature range of 113 K-293 K in steps of 60 K.The results show that the total time of filling and evacuation will be reduced by 15%on the basis of normal temperature when the temperature is reduced by 60 K,which proves the feasibility of evacua

关 键 词：低温靶 微管流动 抽空流洗 数值模拟 

分 类 号：TL632[核科学技术—核技术及应用]