As the unique rotating component, the impeller is the core component of a nuclear reactor coolant pump (RCP), the dynamic properties of the impeller are critical for the safe operation of the whole reactor. The purpose of this study was to shed comprehensive light on the pressure pulsation and modal properties of a scaled RCP impeller via experimental and numerical methods. The numerical model was validated by an experiment connecting the pressure pulsation signals at the diffuser inlet, and a good agreement was obtained between the numerical and experimental results. Pressure pulsation acting on the impeller's blade is mainly dominated by the impeller rotating frequency, the vane passing frequency, and the double blade-passing frequency, and the pressure pulsation acting on the blade's pressure surface is more intense than on the suction surface. The modal properties were obtained via the modal test and numerical methods with the impeller suspended as a free body in the air and submerged inside water. The reduction in the impeller natural frequencies was between 31.63% and 37.77% for the corresponding mode shape due to the added mass effect of the fluid. Based on the pressure pulsation characteristics acting on the impeller and the natural frequency of the impeller, it is considered there is no risk of resonance in the impeller. Finally, it is expected that the present work can provide scientific guidance to avoid hydraulic resonance in nuclear reactor coolant pumps.

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核反应堆冷却剂泵叶轮压力脉动及模态行为研究

叶轮作为独特的旋转部件，是核反应堆冷却剂泵（RCP）的核心部件，叶轮的动态特性对整个反应堆的安全运行至关重要。本研究的目的是通过实验和数值方法全面阐明按比例缩放的 RCP 叶轮的压力脉动和模态特性。通过连接扩压器入口压力脉动信号的实验对数值模型进行了验证，数值与实验结果吻合较好。作用在叶轮叶片上的压力脉动主要由叶轮旋转频率、叶片通过频率和双叶片通过频率决定，作用在叶片上的压力脉动' s 压力面比吸力面更强烈。模态特性是通过模态试验和数值方法获得的，叶轮作为自由体悬浮在空气中并浸入水中。由于流体的附加质量效应，对于相应的振型，叶轮固有频率的降低介于 31.63% 和 37.77% 之间。根据作用在叶轮上的压力脉动特性和叶轮的固有频率，认为叶轮不存在共振风险。最后，预计目前的工作可以为避免核反应堆冷却剂泵中的水力共振提供科学指导。模态特性是通过模态试验和数值方法获得的，叶轮作为自由体悬浮在空气中并浸入水中。由于流体的附加质量效应，对于相应的振型，叶轮固有频率的降低介于 31.63% 和 37.77% 之间。根据作用在叶轮上的压力脉动特性和叶轮的固有频率，认为叶轮不存在共振风险。最后，预计目前的工作可以为避免核反应堆冷却剂泵中的水力共振提供科学指导。模态特性是通过模态试验和数值方法获得的，叶轮作为自由体悬浮在空气中并浸入水中。由于流体的附加质量效应，对于相应的振型，叶轮固有频率的降低介于 31.63% 和 37.77% 之间。根据作用在叶轮上的压力脉动特性和叶轮的固有频率，认为叶轮不存在共振风险。最后，预计目前的工作可以为避免核反应堆冷却剂泵中的水力共振提供科学指导。根据作用在叶轮上的压力脉动特性和叶轮的固有频率，认为叶轮不存在共振风险。最后，预计目前的工作可以为避免核反应堆冷却剂泵中的水力共振提供科学指导。根据作用在叶轮上的压力脉动特性和叶轮的固有频率，认为叶轮不存在共振风险。最后，预计目前的工作可以为避免核反应堆冷却剂泵中的水力共振提供科学指导。