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Research on the Effect of Non-Uniform Inflow on the Cavitation Characteristics of the RCP


 In Advanced Passive (AP) series reactors, the reactor coolant pump (RCP) is directly connected to the bottom of the steam generator (SG) rather than a longer pipe for the fully development of inflow, which leads to an unsteady flow at pump inlet. Some scholars have done several study on the cavitation characteristics of RCP. However, the reality is that two pumps are operating at the same time with different inflow. There has been little research about this. Thus, in this paper, a special test loop has been established to simulate this situation. Then numerical and experimental study were carried out with the special system. As a result, cavitation characteristics of parallel pumps were illustrated under the condition of non-uniform inflow, and these results were compared with the uniform condition. The results show some differences in cavitation performance between different conditions. On the one hand the non-uniform incoming flow causes the angle of attack of the impeller changed, and the distribution of cavitation on the blades varies greatly. On the other hand, there are also some difference in cavitation characteristic between the two pumps duo to the distinction of inflow. The cavitation performance has a little change in rated and small flow condition, but for large flow condition has been a dramatic deterioration.