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在熔盐球床堆设计中,为实现堆芯内部燃料球堆积结构的稳定性,需保证堆芯内部的流场均匀分布。研究基于模拟熔盐球床堆堆芯水力特性的球床密实实验装置(Pebble bed dense experiment facility,PBDE),通过设计不同形状和不同孔道分布的分流板,运用计算流体力学(Computational fluid dynamics,CFD)方法使用FLUENT软件对其堆芯内部的流场分布进行数值模拟,目的是保证实验中堆芯的流场分布均匀稳定。模拟结果表明,平板形分流板较锥形分流板能更好地使堆芯内流场均匀分布;且增加分流板的孔道数目或减小孔径能使堆芯内部的流场更加均匀稳定;比较设计的6种分流板模拟结果,最终给出满足PBDE堆芯流场均匀分布的分流板,为PBDE实验提供了基础,也为熔盐球床堆的堆芯流量分配设计提供技术方案与选型参考。
In the molten salt bed reactor design, in order to realize the stability of the fuel ball accumulation structure in the core, it is necessary to ensure the uniform distribution of the flow field inside the reactor core. A pebble bed dense experiment facility (PBDE) based on the hydraulic characteristics of a molten salt-bed reactor core was studied. Computational fluid dynamics (CFD) was designed by designing manifolds with different shapes and pore distributions. ) The method uses FLUENT software to simulate the flow field distribution in the core of the reactor. The purpose of this method is to ensure uniform and stable flow field distribution in the core during the experiment. The simulation results show that the plate-shaped manifold can better distribute the flow field in the core more than the tapered manifold and the flow field in the core can be more evenly and steadily by increasing the number of channels or reducing the diameter of the manifold. The simulation results of the six kinds of manifolds are given, and finally the manifolds are provided to meet the uniform distribution of PBDE core flow field, which provides a basis for PBDE experiments and provides technical solutions and selection for core flow distribution design of molten salt ball bed reactor reference.