To examine the cavitation noise characteristics of centrifugal pumps, the combination of test and simulation was applied in this study. The numerical method is based on spherical cavity radiation theory and the acoustic finite element method. A multi-field synchronized test-rig was built to study and validate the numerical results under cavitating flow and cavitation noise conditions. The three-dimensional unsteady flow-field simulation was carried out inside the centrifugal pump based on DES and the improved-RZGB cavitation model. The constructed numerical method for cavitation noise was used to solve the acoustic-field based on the flow-field solutions. The test–simulation comparison reveal that the numerical simulation results are consistent and reliable. The development of cavitation has a stronger influence on the strong vorticity regions in the impeller flow channel, and the vortex has a promotional-effect on the formation of cavitation. With the same cavitation number, the acoustic-power on the blade suction-side is greater than the pressure-side of the blade. As the cavitation number decreases, the pulsating radiated noise of cavitation volume is the primary noise-source for the increased acoustic-power value. At this stage, the SPL and total SPL at the model pump inlet show a decreasing trend during the severe cavitation-stage.

为检验离心泵的汽蚀噪声特性，本研究采用试验与仿真相结合的方法。数值方法基于球腔辐射理论和声学有限元法。建立了一个多场同步试验台来研究和验证空化流和空化噪声条件下的数值结果。基于DES和改进的RZGB空化模型对离心泵内部进行三维非定常流场模拟。基于流场解，采用构造的空化噪声数值方法求解声场。试验仿真对比表明，数值仿真结果一致可靠。空化的发展对叶轮流道内的强涡区影响较大，涡对空化的形成有促进作用。在空化数相同的情况下，叶片吸力侧的声功率大于叶片压力侧的声功率。随着空化数的减少，空化体积的脉动辐射噪声是声功率值增加的主要噪声源。在此阶段，模型泵入口处的 SPL 和总 SPL 在严重空化阶段呈下降趋势。空化体积的脉动辐射噪声是提高声功率值的主要噪声源。在此阶段，模型泵入口处的 SPL 和总 SPL 在严重空化阶段呈下降趋势。空化体积的脉动辐射噪声是提高声功率值的主要噪声源。在此阶段，模型泵入口处的 SPL 和总 SPL 在严重空化阶段呈下降趋势。