How to accurately predict the resonance operating point and the corresponding vibrating amplitude of the underwater structures are of interest in the field of hydraulic machinery. In the present investigation, a resonance risk assessment method consisting of unsteady CFD, modal work approach, and harmonic response analysis is established, and an implementation is carried out on a centrifugal impeller of a storage pump. The simulation results (head, efficiency, and pressure pulsation) are carefully verified by comparing them with the experimental results, with relative deviations within 11%. Regarding the prototype pump, the amplitude of the pressure pulsation coefficient is almost identical to the model pump, with a relative deviation of 13.5%. It is found that the hydrodynamic damping ratio is gradually decreased if the operating flow rate deviates from the design one, based on the modal work approach. And then, the harmonic response is carried out on the prototype impeller, by setting the pressure pulsation as the initial excitation condition and considering the hydrodynamic damping ratio. Finally, the natural frequency, the resonance amplitude, and maximum equivalent stress are quantitatively determined, which proves that the resonance risk assessment method has the potential to judge the resonance operating point and destructiveness in practical engineering.

如何准确预测水下结构的共振工作点和相应的振动幅度是水工领域的研究热点。本研究建立了一种由非定常CFD、模态功法和谐波响应分析组成的共振风险评估方法，并在蓄能泵离心叶轮上进行了实施。仿真结果（扬程、效率和压力脉动）通过与实验结果的比较仔细验证，相对偏差在 11% 以内。原型泵的压力脉动系数幅值与模型泵几乎一致，相对偏差为13.5%。基于模态功法发现，当运行流量偏离设计值时，流体动力阻尼比逐渐减小。然后，以压力脉动为初始激励条件，考虑流体动力阻尼比，对原型叶轮进行谐波响应。最后定量确定了固有频率、共振幅值和最大等效应力，证明共振风险评估方法在实际工程中具有判断共振工作点和破坏性的潜力。通过将压力脉动设置为初始激励条件并考虑流体动力阻尼比。最后定量确定了固有频率、共振幅值和最大等效应力，证明共振风险评估方法在实际工程中具有判断共振工作点和破坏性的潜力。通过将压力脉动设置为初始激励条件并考虑流体动力阻尼比。最后定量确定了固有频率、共振幅值和最大等效应力，证明共振风险评估方法在实际工程中具有判断共振工作点和破坏性的潜力。