Abstract The passive residual heat removal system (PRHRS) is adopted by the HTR-10 and HTR-PM to remove the decay heat in the reactor core, so that the safety of the reactor can be guaranteed under accident conditions. A multi-scale CFD-system coupled code used to calculate the transient characteristics of the PRHRS of HTR-10 was developed in this study. With this coupled code, the transient characteristics of the PRHRS during the startup process were calculated. The results show that the computational results are in good agreement with the experimental results, which validates the accuracy of the coupled code. The ability of the coupled code to simultaneously calculate the local heat transfer process in the reactor cavity and the global heat removal characteristic of the PRHRS is also shown. Moreover, radiation heat transfer plays a very important role in the heat removal process of the PRHRS.

中文翻译：

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用于 MHTGR 被动余热排出系统瞬态分析的多尺度 CFD 系统耦合代码

摘要 HTR-10和HTR-PM采用被动余热去除系统（PRHRS）去除反应堆堆芯中的衰变热，保证反应堆在事故工况下的安全。本研究开发了一种用于计算 HTR-10 的 PRHRS 瞬态特性的多尺度 CFD 系统耦合代码。使用该耦合代码，计算了PRHRS 在启动过程中的瞬态特性。结果表明，计算结果与实验结果吻合较好，验证了耦合编码的准确性。还显示了耦合代码同时计算反应堆腔内局部传热过程和PRHRS 的全局排热特性的能力。而且，