| 摘要: |
| 冷冻靶靶丸氘氚（DT）内冰层均匀性直接影响到惯性约束聚变（ICF）点火成功率，衡量冰层均匀性的重要指标为靶丸表面温度均匀性。本文利用CFD软件对球腔内的温度场与速度场变化进行模拟，包括恒定冷臂温度下的稳态工况和非稳态降温过程，研究了不同烧蚀层材料以及冰层形貌下的冷冻靶丸传热特性和温度场分布。结果表明，高导热性烧蚀层材料对于提高冷冻靶温度场均匀性具有积极作用，当材料的导热系数高于400 W/(m·K)时，该球形冷冻靶靶丸外表面温差已小于0.01 mK。在非稳态降温过程中，比热容和导热系数大的高密度碳（HDC）材料的靶丸外壁面温差比碳氢聚合物靶（CH）靶丸约减少81%。 |
| 关键词: 冷冻靶 温度均匀性 烧蚀层材料 氘氚冰层 数值模拟 |
| DOI： |
| 投稿时间：2018-12-10 修订日期：2019-05-22
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| 基金项目:国家重大课题专项和国家自然科学基金（51506158）资助项目。 |
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| Effect of Ablation Material and Deuterium-tritium Ice Profile on Cryogenic Target Thermal Fields |
|
Li Cui, Ding Lan, Li Yanzhong, Xin Yi, Zhao Jun
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| (School of Energy and Power Engineering, Xi'an Jiaotong University) |
| Abstract: |
| The uniformity of deuterium-tritium (DT) ice layer plays a key role in the successful ignition of indirective inertial confinement fusion (ICF), and is closely related to the temperature field of the cryogenic target, especially the temperature uniformity around the fuel capsule. In this study, CFD simulation is performed on the thermal field of cryogenic target using a spherical hohlraum under stable and unsteady cooling conditions. Two kinds of ablation layer material, i.e., the hydrocarbon (CH) and the high-density carbon (HDC) are considered, and the effects of DT ice profile on their temperature distribution are analyzed. The results show that the high thermal conductivity of the target material has a positive effect on improving the field uniformity of the target’s temperature. If the thermal conductivity of an ablative material is higher than 400 W/(m·K), the temperature difference on the outer surface of the target will be less than 0.01 mK. In the cooling process, the HDC target with higher specific heat capacity and thermal conductivity provides a much smaller temperature difference than the CH target. |
| Key words: cryogenic target temperature uniformity ablative material deuterium-tritium ice numerical simulation |
