To analyze the influence of duct geometrical parameters on hydrodynamic performance of pump jet propulsor, this paper presents a surface panel method for predicting performance of pump jet propulsor. And, moreover, a meshing method for blade, based on circular conical surface, is proposed. According to the actual situation of the internal flow of the pump jet propulsor, a tip leakage vortex model for the blades with flat top is also proposed. The hydrodynamic performance of pump jet propulsor under different conditions was calculated and compared with CFD results for the verification of the presented method. Then the influence of duct parameters on pump jet performance was analyzed from several aspects including performance index, surface pressure distribution, and flow velocity. The results show that variations of gap size, camber or attack angle of duct result in different hydrodynamic performance. Suitable selection of duct geometry can significantly increase the thrust efficiency of the pump jet propulsor, expand the range of effective work, and improve the loading characteristics of the blade.

中文翻译：

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管道几何参数对泵喷推进器水动力性能的影响分析

为分析管道几何参数对泵喷推进器水动力性能的影响，提出了一种预测泵喷推进器性能的面板方法。此外，还提出了一种基于圆锥面的叶片啮合方法。根据泵喷推进器内部流动的实际情况，还提出了平顶叶片的叶尖泄漏涡模型。计算了泵喷推进器在不同条件下的水动力性能，并与 CFD 结果进行了比较，以验证所提出的方法。然后从性能指标、表面压力分布、流速等几个方面分析了管道参数对泵射流性能的影响。结果表明，间隙大小的变化，管道的弯度或攻角导致不同的水动力性能。Suitable selection of duct geometry can significantly increase the thrust efficiency of the pump jet propulsor, expand the range of effective work, and improve the loading characteristics of the blade.