摘要
针对支撑结构的引入对靶丸温度分布产生扰动这一问题,建立带不同靶丸支撑结构的三维低温靶模型,基于离散坐标辐射模型和Boussinesq假设,研究了支撑结构对靶丸温度特性的影响,并对比了不同支撑结构靶丸温差对黑腔内氦气压力变化的敏感程度,最后针对泡沫垫衬薄膜支撑研究了泡沫材料参数的影响规律。结果表明:支撑膜能显著降低黑腔内自然对流强度,薄膜支撑与两极支撑靶丸温度均匀性优于无支撑膜的充气管支撑和支撑杆支撑,薄膜支撑相比两极支撑靶丸温度均匀性略高;充气管直径越大,靶丸温度均匀性越差。基准工况下,薄膜支撑靶丸外表面最大温差最小,温度均匀性最好,两极支撑、充气管支撑及支撑杆支撑最大温差较薄膜支撑分别增大了5.92%、32.71%及17.99%;氦气压力升高,靶丸外表面温度均匀性逐渐恶化,薄膜支撑和两极支撑靶丸温差对氦气压力变化的敏感度更低;对于泡沫垫衬薄膜支撑,通过选用导热系数较大的泡沫材料并减小其厚度可获得较好的靶丸温度均匀性。该计算结果可为靶丸支撑结构的工程设计提供一定的理论支撑。
In this study,three-dimensional cryogenic target models are established based on the discrete ordinates radiation model and Boussinesq hypothesis to investigate the perturbations of capsule thermal distribution caused by the use of capsule supports.Variations of temperature and flow field distributions as well as the sensitivity to helium pressure in hohlraum with different capsule supports are obtained.Finally,the influence of foam material parameters of the foam shell support is investigated.The results show that the targets using tent and polar tent supports have more uniform capsule temperature distribution than those with the fill-tube support and rod support as a result of the weakened natural convection inside the hohlraum.The tent support is more effective than the polar tent support due to its better film arrangement.For the two types of non-film supports,the pure fill-tube support provides the worst temperature uniformity due to its larger fill-tube diameter when compared with the rod support.Under typical operating conditions,the capsule with tent support has the smallest maximum temperature difference of 2.45 mK;the maximum temperature differences of the capsule with the polar tent support,fill-tube support and rod support are 5.92%,32.71%and 17.99%higher,respectively.Moreover,the temperature uniformity deteriorates with the increase of helium pressure for the four support types.The temperature uniformity of the tent support and polar tent support is less sensitive to the helium pressure change.For the foam shell support,a more uniform capsule temperature distribution can be obtained by choosing a foam shell with higher thermal conductivity and smaller thickness.The calculation results can serve as a theoretical basis to some extent for the engineering design of the capsule support.
作者
李黎
李翠
赵小迪
胡孟华
傅智莹
厉彦忠
LI Li;LI Cui;ZHAO Xiaodi;HU Menghua;FU Zhiying;LI Yanzhong(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2023年第5期149-158,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(52176021)。
关键词
低温靶
支撑结构
温度特性
数值模拟
cryogenic target
capsule supports
temperature characteristic
numerical simulation
