基于CFD数值模拟的复合叶轮核主泵压力脉动特性研究

为了降低核主泵在不同工况下运行时的压力脉动，采用数值模拟对核主泵3种不同进口直径的短叶片进行对比。结果表明：短叶片进口直径的改变并未改变叶轮的主频，但随着短叶片进口直径的增加，背面高频值逐渐减小，而工作面高频值却逐渐增大。在小流量工况下不同进口直径的短叶片的压力脉动幅值均较大；在设计工况下叶片背面各监测点在低频区与高频区域的波动能量明显大于叶片工作面各监测点在低频区和高频区的波动能量；大流量工况下叶片背面附近各监测点的低频区带宽及高频区的脉动能量明显增加，叶片工作面附近各监测点的脉动幅值出现较大的增加，短叶片背面附近各监测点的脉动幅值明显高于长叶片背面的脉动幅值。分析结果表明：短叶片进口直径为0.72D₂时，压力脉动在各种工况下运行最小。

Numerical Simulation on Pressure Fluctuation of Reactor Coolant Pump With Complex Impeller Based on CFD Technique

In order to decrease pressure fluctuation of the reactor coolant pump under different conditions, three different inlet diameters of short blade of the reactor coolant pump were compared using numerical simulation, and the results show that the change of flow or inlet diameter of short blade does not change the dominant frequency of impeller. The high frequency of the suction side of blade gradually decreases and the high frequency of the pressure face gradually increases with the increase of inlet diameter of short blade. The pressure fluctuation amplitude of different inlet diameters of short blade with small flow is large. The wave energy of each monitoring point in the low frequency region and the high frequency region on the suction side of blade is significantly larger than that of the pressure face in the design condition. The band width of the low frequency region and wave energy of the high frequency region of monitoring points near the suction side of blade significantly increase at large flow fluctuation. The fluctuation amplitude of monitoring points near the pressure face of the blade has a large increase. The pulsation amplitude of each monitoring point near the suction side of the short blade is significantly higher than that of the long blade. The comprehensive analysis shows that when the inlet diameter of the short blade is 0.72 D₂, the pressure fluctuation in a variety of conditions reaches minimum.