Abstract The nuclear reactor coolant pump transferring heat energy inherently brings with it the unsteady flow and inevitably threatens to the safe operation of the pump unit, especially with the pressure pulsation induced by the rotor-stator interaction. In this paper, the characteristics of pressure pulsation of the diffuser in a nuclear reactor coolant pump were investigated by the numerical simulation with experimental validation. Pressure pulsation signals measured synchronously from sensors mounted on the radial diffuser of a model pump were analyzed via Welch’s method. Frequency components induced by the rotor-stator interaction can be revealed by the diameter mode analysis method. The pressure pulsation of the diffuser is dominated by the blade passing frequency and its harmonics, which are free from the effect of flow rate and rotational speed while the corresponding amplitudes are easily affected by different operational conditions and measuring positions. The non-uniformity is much more affected by the rotational speed than the flow rate. This research is helpful for further work to reduce the pressure pulsation for the reactor coolant pump.

中文翻译：

---

核反应堆冷却剂泵扩压器非均匀压力脉动研究

摘要 传递热能的核反应堆冷却剂泵固有地带来不稳定流动，不可避免地威胁到泵机组的安全运行，特别是转子-定子相互作用引起的压力脉动。本文通过数值模拟和实验验证研究了核反应堆冷却剂泵中扩散器的压力脉动特性。从安装在模型泵径向扩散器上的传感器同步测量的压力脉动信号通过 Welch 方法进行分析。由转子-定子相互作用引起的频率分量可以通过直径模式分析方法来揭示。扩压器的压力脉动由叶片通过频率及其谐波支配，不受流量和转速的影响，而相应的振幅容易受不同的操作条件和测量位置的影响。与流速相比，不均匀性受转速的影响要大得多。这项研究有助于进一步减少反应堆冷却剂泵的压力脉动。