中文摘要：

为了研究导管桨的推力、转矩和效率等关键水动力参数与进速系数之间的关系,本文采用计算流体力学技术（computational fluid dynamics,CFD）分析导管对螺旋桨水动力特性的影响。在建立导管桨的计算模型时,采用了全结构化网格技术,螺旋桨和导管之间的相对运动通过运动参考系（moving reference frame,MRF）方法实现。本文以JD7704＋Ka4-55导管桨为例,分析其定常水动力性能,用试验结果对数值计算结果进行了初步验证,进而研究了不同导管长度和叶稍间距时导管桨的水动力特性,并探讨了斜流对导管桨推力、转矩和效率的影响。结果表明：导管桨在低进速下由导管所产生的推力会有较大提升,导管的存在能够显著减小斜流中螺旋桨推力和转矩的脉动。

英文摘要：

In order to investigate the correlation between the characteristic hydrodynamic parameters and the advance velocity coefficient of a ducted propeller,we use computational fluid dynamics to analyze the effect of the duct on the hydrodynamic properties of the propeller. The numerical model is established,the computational domain is discretized using fully structured grids,and the relative motion between the propeller and the duct is modeled using a moving reference frame. The steady hydrodynamic performance of a D7704 ＋ Ka4-55 ducted propeller in open water is analyzed,and the test results are used initially to verify the numerical results. We then study the hydrodynamic properties of a ducted propeller at different duct lengths and tip intervals. In addition,the effects of oblique flow on the thrust,torque,and efficiency of a ducted propeller are discussed. The results show that the duct greatly increases the generated thrust at relatively low advance velocities,whereas the existence of the duct can reduce the propeller thrust and the torque pulsation in oblique flows.