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Numerical investigation on startup characteristics of high temperature heat pipe for nuclear reactor
Nuclear Engineering and Design ( IF 1.7 ) Pub Date : 2021-03-27 , DOI: 10.1016/j.nucengdes.2021.111180
Zeqin Zhang , Xiaoming Chai , Chenglong Wang , Hao Sun , Dalin Zhang , Wenxi Tian , Suizheng Qiu , G.H Su

Heat pipe cooled reactor (HPR) has a good adaptability to portable power system, which is popular in recent years. Due to the particularity of alkali-metal working fluid, the deep understanding of startup characteristics of high temperature heat pipe from frozen state is essential for the development of HPRs. In this paper, a three-stage frozen startup model is developed to describe the thermal behavior of heat pipe during the startup process, and the continuum flow in the vapor space is modeled as a one-dimensional compressible flow. A numerical code is carried out, in which the governing equations are discretized by Finite Element Method (FEM), and then the code is used to simulate the startup performance of a NaK heat pipe in HPRs. Numerical results indicate that the heat pipe startup behavior can be well described by the three-stage model. The NaK heat pipe is successfully started with a final consistency temperature of 834 K, although the entire second stage is restricted by the sonic limitation. The startup lasts 1550 s in total, and enters the second and third stage at 230 s and 650 s, respectively. After 1500 s, the maximum Mach number of vapor flow is lower than 0.1, which verifies the rationality of the one-dimensional compressible flow model of vapor. This work could provide a reference for the design and application of HPRs.



中文翻译:

核反应堆高温热管启动特性的数值研究

热管冷却反应堆(HPR)对便携式电源系统具有良好的适应性,这在近年来很受欢迎。由于碱金属工作流体的特殊性,从冷冻状态深入了解高温热管的启动特性对于HPR的开发至关重要。本文建立了一个三阶段冻结启动模型来描述热管在启动过程中的热行为,并将蒸汽空间中的连续流建模为一维可压缩流。进行了一个数字代码,其中控制方程通过有限元方法(FEM)离散化,然后使用该代码来模拟HPR中NaK热管的启动性能。数值结果表明,三阶段模型可以很好地描述热管的启动行为。尽管整个第二阶段都受到音速限制,但NaK热管成功地以834 K的最终恒定温度启动。启动总共持续1550 s,然后分别以230 s和650 s进入第二阶段和第三阶段。1500 s后,蒸汽的最大马赫数小于0.1,这证明了蒸汽的一维可压缩流模型的合理性。这项工作可以为HPR的设计和应用提供参考。验证了蒸汽的一维可压缩流模型的合理性。这项工作可以为HPR的设计和应用提供参考。验证了蒸汽的一维可压缩流模型的合理性。这项工作可以为HPR的设计和应用提供参考。

更新日期:2021-03-27
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