In order to reveal the operating characteristics of the pumpjet propulsor, standard [Formula: see text]–[Formula: see text], standard [Formula: see text]–[Formula: see text], RNG [Formula: see text]–[Formula: see text] and SST [Formula: see text]–[Formula: see text] turbulence models were used to conduct steady calculation for the whole flow channels. By comparing the calculation results with experimental data, it was found that the calculation errors were very large in some operating conditions. Therefore, the uncertainty analysis was carried out at all operating conditions of the pumpjet propulsor and the error source was finally determined that it is mainly derived from the model error. Then, the applicability of different turbulence models was analyzed to numerical simulation for the pumpjet propulsor by comparing the internal and external characteristics. It can be seen that the strong turbulent kinetic energy in the guide vane will inevitably cause energy loss, but not necessarily in the impeller. In this area, the increase of turbulent kinetic energy will enhance the mixing and transport of fluids, and the impeller makes the fluids get more energy. In addition, a modified hybrid Reynolds Average Numerical Simulation/Large Eddy Simulation (RANS/LES) model was proposed for unsteady calculation, and the performances, internal flow states and the interaction between the pump and the outer region were further revealed under various conditions of the pumpjet propulsor, which provides some references for predicting accurately and selecting conditions optimally in the future.

中文翻译：

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泵喷推进器CFD不确定性分析及性能预测

为了揭示泵浦推进器的运行特性，标准[公式：见文]-[公式：见文]，标准[公式：见文]-[公式：见文]，RNG[公式：见文]- [公式：见正文]和SST [公式：见正文]-[公式：见正文]湍流模型用于对整个流道进行稳态计算。通过将计算结果与实验数据进行对比，发现在某些工况下计算误差非常大。因此，对泵浦推进器的所有工况进行了不确定性分析，最终确定误差源主要来源于模型误差。然后，通过比较内外部特性，分析了不同湍流模型对泵浦推进器数值模拟的适用性。可见，导叶内的强大湍动能必然会造成能量损失，但在叶轮中却不一定。在该区域，湍动能的增加会增强流体的混合和输送，叶轮使流体获得更多的能量。此外，提出了一种改进的混合雷诺平均数值模拟/大涡模拟（RANS/LES）模型进行非定常计算，进一步揭示了泵在各种条件下的性能、内部流动状态以及泵与外部区域的相互作用。泵浦推进器，