超高温锂热管设计与热输运性能分析

超高温锂热管冷却的核反应堆因其静默性、体积小等优势，在深海核动力和深空探测方面具有广泛的应用前景。为掌握超高温锂热管的传热特性，开展了超高温锂热管设计，并基于热阻网格法开发了超高温锂热管的Python程序，在此基础上对锂热管进行热输运性能分析。通过与其他现有模型和实验数据对比，验证了本文开发的模型精度，且应用该程序校核了本文设计的超高温锂热管，并分析了超高温锂热管在变功率工况下热管结构对热管达到新的稳定状态所需转变时间的影响。结果表明，本文设计的超高温锂热管符合设计要求；增加管壁厚度和吸液芯厚度会增加转变时间；增加冷凝段长度有利于减少转变时间。本文研究为热管堆的优化设计和安全分析提供了依据。 

Design and Heat Transfer Performance Analysis of Ultra-High Temperature Lithium Heat Pipe

Ultra-high temperature lithium (Li) heat pipe cooled nuclear reactor has broad application prospects in the areas of deep-sea nuclear power and deep-space exploration due to its silence, small size and other advantages. In order to master the heat transfer characteristics of ultra-high temperature lithium heat pipe, the design of ultra-high temperature lithium heat pipe is carried out, and the Python program of ultra-high temperature lithium heat pipe is developed based on the thermal resistance grid method. On this basis, the heat transport performance of lithium heat pipe is analyzed. By comparing with other existing models and experimental data, the accuracy of the model developed in this paper is verified, and the ultra-high temperature lithium heat pipe designed in this paper is checked by using this program, and the influence of heat pipe structure on the transition time of ultra-high temperature lithium heat pipe to reach a new stable state under variable power condition is analyzed. The results show that the ultra-high temperature lithium heat pipe designed in this paper meets the design requirements; increasing the wall thickness and wick thickness increase the transition time; increasing the length of the condensation section is beneficial to reduce the transition time. The research in this paper provides the basis for the optimization design and safety analysis of the heat pipe reactor.