摘要
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。
Background： Molten salt pebble-bed reactor is one of the six generation IV reactor types, and is a new reactor, in the thermal-hydraulic design of pebble bed dense experiment facility （PBDE） of molten salt reactor, the uniform flow field distribution of the core is the prerequisites of the experiment, and the distribution plate plays a decisive role in the flow filed distribution of the core. Purpose： This study aims to design a reasonable distribution plate to get steady flow field in the core of PBDE, so that the fuel spheres can keep stable floating in the core. Methods： To realize uniform flow field distribution of the core, the distribution plates which have different shapes and channel arrangements are designed based on PBDE. The flow field of the core is simulated using the FLUENT software. Results： The simulation results showed that the conical distribution plate will produce some non-uniform flow field in the center area of the core, and the flat distribution plate can get the uniform flow field distribution better in the core compared with the conical distribution plate, in addition, the increase of channels or the decrease of apertures of the distribution plates can also make the flow field of the core more uniform. Conclusions： The design of the reasonable distribution plate is significant to get the uniform flow field of the core, this study shows the basis for the experiment of PBDE, and provides the technical support and reference for the later design of the core distribution plate to the molten salt reactor.
出处
《核技术》
CAS
CSCD
北大核心
2017年第4期87-94,共8页
Nuclear Techniques
基金
中国科学院战略性先导科技专项项目(No.XDA0201002)资助~~
关键词
熔盐球床堆
实验装置
分流板
计算流体力学
Molten salt pebble-bed reactor, Experiment facility, Distribution plate, Computational fluid dynamics（CFD）
