物理学报Issue(21)：1-8,8.DOI:10.7498/aps.64.215201
黑腔冷冻靶传热与自然对流的数值模拟研究∗
Numerical simulation of heat transfer and natural convection of the indirect-driven cryogenic target
摘要
Abstract
ICF design requires smooth and uniform deuterium-tritium (D-T) ice layers in a spherical shell. Thermal environ-ment around the capsule is the key to reach the low-mode ice layer roughness requirement and obtain a high quality ice layer. In this paper, we present the results of three-dimensional simulation for an indirect-driven cryogenic target, focusing on the issues of heat transfer and natural convection flow inside the hohlraum. A thermal and hydrodynamic calculation is first proposed to investigate the convection heat transfer effect on the D-T ice layer. Comparing the two cases with gravity considered or neglected, we find that the temperature variation at the ice layer inner surface caused by the natural convection flow and the hohlraum’s structure are of the same order of magnitude. Then the parameters study on Rayleigh number, which is a dimensionless number associated with free convection, is carried out. Thermal simulations on different Rayleigh number are provided. Temperature variation at the D-T ice layer inner surface is to increase as soon as the Rayleigh number reaches 60. Comparisons among different gases under different operating pressure conditions are made. In order to avoid the convection heat transfer effect in a wide range of pressure, it is necessary to take pure helium or mixture gas with a small amount of hydrogen as the tamping gas. The influence of hohlraum’s orientation on the natural convection is also studied. It is found that the convective heat transfer effect in a horizontally orientated hohlraum is stronger than that in a vertical one. Based on these, we discuss the possibility to eliminate the convection flow by partitioning the hohlraum into several regions. The calculated results for several cases of different gas-region models indicate that the convection flow can be eliminated with an appropriate division in a vertically orientated hohlaum but cannot in a horizontally orientated one. The conclusions in this paper have certain guiding significance for further design and experiments of cryogenic target.关键词
惯性约束聚变/冷冻靶/自然对流/热模拟Key words
inertial confinement fusion (ICF)/cryogenic target/free convection flow/thermal simulation引用本文复制引用
黄鑫,彭述明,周晓松,余铭铭,尹剑,温成伟..黑腔冷冻靶传热与自然对流的数值模拟研究∗[J].物理学报,2015,(21):1-8,8.基金项目
国家重大专项和中国博士后科学基金(批准号:2014 M552382)资助的课题 （批准号:2014 M552382）
