【摘要】 第三代压水反应堆在下腔室布置新型流量分配裙结构，用于优化反应堆内部流动特性。研究安装流量分配裙和不安装流量分配裙时的反应堆流动阻力系数、堆芯入口流量分配因子和下腔室交混因子，进行定量对比分析，为反应堆热工水力设计和安全分析提供试验依据。试验结果表明：安装流量分配裙后反应堆入出口总阻力系数降低约1.4%;流量分配裙在各种环路运行工况下均能够改善堆芯入口流量分配，回路运行环路数越少改善效果越明显；安装流量分配裙后下腔室流动交混剧烈程度明显降低。更多还原

【Abstract】 The flow skirt installed in the lower plenum for the 3rd generation pressurized water reactor has been utilized to enhance reactor internal flow characteristics. Running two types of experiments based on the full model and modified model without the flow skirt, flow resistance coefficient, core inlet flow distribution factor and flow mixing factor have been quantitatively analyzed in order to estimate the effect of the flow skirt geometry on the lower plenum internal flow field. The experiment results provide a basis for thermal-hydraulic design and safety analysis. Overall, the new type of flow skirt would reduce the total flow resistance coefficient by about 1.4%. Besides, the new flow skirt can improve core inlet flow distribution, especially with the reduction in loop operation numbers. And the flow mixing intensity inside the lower plenum would be weakened because the flow skirt exists.更多还原