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堆芯入口流场设计是小型固态燃料熔盐堆系统项目内容之一,它对反应堆结构的稳定性、堆芯温度和流场分布有着非常重要的影响。研究了熔盐流道流通面积变化对堆芯入口温度、流场分布及压降的影响,优化熔盐流道几何结构。以小型熔盐球床堆模型为研究对象,取符合实际边界条件的输入参数,通过改变熔盐流道流通面积,使用计算流体力学(Computational Fluid Dynamics,CFD)通用程序Fluent 16.0对堆芯入口内熔盐的热工水力特性进行数值模拟。在考虑实际下反射层流道的流通面积占比最大为18.14%下,研究了熔盐流道流通面积占比在区间[0,15.00%]变化。结果表明,堆芯活性区熔盐最高局部热点温度随熔盐流道流通面积比的增大而增高;堆芯入口内的压降随下反射层熔盐流道流通面积比的减小而增大;在径向方向上流进孔道的熔盐流速随着孔道远离堆芯位置而增大。本研究可为小型固态燃料球床熔盐堆优化设计提供一定的参考价值。
The design of core inlet flow field is one of the items of small solid fuel molten salt reactor system, which has a very important influence on the stability of reactor structure, core temperature and flow field distribution. The influence of the change of flow area of molten salt flow channel on the inlet temperature, flow field distribution and pressure drop of the core was studied, and the geometrical structure of molten salt flow channel was optimized. Taking the small molten salt bed model as the research object, the input parameters that meet the actual boundary conditions were taken. The flow area of the molten salt flow channel was changed by using the Fluent 16.0 CFD program. The thermal-hydraulic properties of molten salt were numerically simulated. Considering the fact that the proportion of the flow area in the reflective layer is 18.14%, the change of the flow area of the molten salt flow in the interval [0,15.00%] is studied. The results show that the highest hot spot temperature of molten salt in the core active zone increases with the increase of the flow area ratio of the molten salt flow channel. The pressure drop in the core inlet increases with the decrease of the flow area ratio of the molten salt flow path in the lower reflector Large; the molten salt flow rate into the cell in the radial direction increases as the cell moves away from the core. This study can provide some reference value for the optimization design of molten salt reactor for small solid fuel ball bed.