板型燃料组件池式反应堆堆芯流量分配

为优化板型燃料组件池式反应堆设计 ,采用商用流体力学计算程序 CFX5对堆内流场进行了数值模拟。数值计算结果表明 :堆芯流量分配比较均匀 ,位于堆芯中央组件的流量较大 ,而位于堆芯边缘组件的流量较小。安装围桶的堆进出口差压与没有围桶的堆进出口差压很接近 ,随着堆入口流量增大 ,堆芯各组件流量与组件平均流量的最大误差和最小误差变化很小。安装围桶的堆芯流量分配情况与没有围桶的堆芯流量分配情况近似 ,安装围桶不能有效改善堆芯各组件的流量分配

Flow distribution in a pool type nuclear reactor core with planar fuel assemblies

The computational fluid dynamics program CFX5 was used to analyze the flow processes in a pool type nuclear reactor with planar fuel assemblies, to provide reference data for reactor design optimization and safe operation. The results show that the core flow distribution is not uniform, with the flow in the core center assemblies being rather high while the flow in the edge assemblies is much less. The differential pressure between the reactor inlet and outlet with an enclosure is almost the same as the differential pressure without an enclosure for the same flow rate. The maximum and minimum differences of the flow rates in each fuel assembly from the average flow rate varies little with changes in the averge flow rate. The flow distribution in the reactor with an enclosure is also similar to that without an enclosure. Therefore, an enclosure would not help improve the flow distribution within the core.