反应堆冷却剂泵叶轮水力性能分析与优化设计

以反应堆冷却剂泵叶轮为研究对象，采用计算流体动力学（CFD）方法对其内部流场进行数值模拟，得到该泵叶轮水力性能的分析结果。根据CFD分析结果，叶片入口轮毂侧流动冲角过大，叶轮额定流量下的扬程低于设计要求，必须汽蚀余量（NPSHr）较大，需对其进行优化设计。考虑到CFD计算的偏差和实际工程经验，确定了叶轮水力性能优化目标；以叶片进口安放角、出口安放角和叶片进口边位置为优化变量，选择多种组合方案进行计算，确定了优化设计方案。对优化设计后的叶轮进行CFD计算，结果表明:相对原设计的叶轮，优化后的叶轮叶片入口处流动冲击明显减小，NPSHr大幅减小，内部流场更为合理，水力性能明显改善，优化方案满足预期目标。 

Hydraulic Performance Analysis and Optimization for the Impeller of Reactor Coolant Pump

In this paper, the impeller of the reactor coolant pump is analyzed by Computational Fluid Dynamics (CFD) method to obtain its hydraulic performances. According to the CFD analysis results, the impeller cannot match the system requirements and need be optimized because of the lower head under rated flow, the high flow incidence at the inlet of the blade around the region near the hub, and the high net positive suction head (NPSHr). Optimization targets are determined according to the calculation tolerances and engineering experiences. The impeller inlet angle and outlet angle, and the location of the head of blade are determined as variables of the optimization. After calculation and comparison, the final optimization proposal is determined. The analysis results for the optimized impeller show that the flow incidence at the inlet of the blade is decreased obviously, anti-cavitation capability and internal flow conditions in the impeller are better than the original one, and the optimization target is achieved.