石墨慢化通道式熔盐堆的稳态热工水力计算模型

针对石墨慢化通道式熔盐堆的堆芯结构，基于COMSOL Multiphysics程序和MATLAB程序建立了堆芯稳态热工水力学计算模型。该模型对堆芯内固体区域的温度分布采用三维热传导方程进行模拟，对通道内熔盐温度采用一维单相流体模型进行计算。固体区域与熔盐通过熔盐通道壁面的对流换热边界建立热耦合。该模型基于平行通道压力损失相等的原则，分配堆芯内各熔盐通道的流量。通过对比RELAP5程序的计算结果，验证了模型对温度和流量分配计算的正确性。针对2 MWt 液态燃料熔盐堆的一种概念设计，分析了堆芯内三维温度分布和通道间流量分配。该模型可精确计算通道式熔盐堆堆芯内稳态温度分布和流量分配，对堆芯的热工水力学设计具有重要意义。

Steady Thermal-hydraulic Analysis Model for Graphite-moderated Channel Type Molten Salt Reactor

Based on COMSOL Multiphysics and MATLAB software, a three-dimensional thermal-hydraulic model was developed for the graphite-moderated channel type molten salt reactor (MSR). The temperature distribution in the solid region was calculated with a three-dimensional heat conduction equation. The heat transfer in the molten salt was modelled by the one-dimensional single-phase flow model. The thermal coupling of fuel salt and solid region was set up through the convective heat transfer boundary condition at the surface of fuel channel. The mass flow rate in each fuel channel was calculated based on the assumption of equal pressure drop over all channels. In terms of temperature and mass flow rate distribution calculations, the result from this thermal-hydraulic model is consistent with that from the RELAP5 code. With the aid of this model, the temperature and mass flow rate distributions in the 2 MWt MSR were analyzed. This thermal-hydraulic model can be used to precisely analyze the temperature and mass flow rate distributions of the channel type molten salt reactor, which is quite useful in the thermal-hydraulic design.