导管调距桨的定常性能预估

本文建立了一个预估导管可调螺距螺旋桨水动力性能的数值计算方法，即螺旋浆用升力面理论、导管采用面元法，通过迭代计算考虑浆和导管的相互影响。引入了一个修正的螺旋浆尾涡模型，来模拟尾涡片的扭曲变形及分离现象，对导管桨性能预估的各种影响因素分析了系统研究，并考虑了桨毂对性能的影响。对JD简易导管桨和导管调距桨（JD7704导管＋JDC三叶可调螺距螺旋浆）分别进行了计算，并与实验结果进行了比较。结果表明，本文所建立的方法可较好地预估导管桨的水性能，精度比以往有较大的提高。

Prediction of Hydrodynamic Performances of Ducted Controllable Pitch Propellers

A numerical method is developed to predict the steady performance of ducted controllable pitch propllers.A vortex lattice method is used for the propeller and a surface panel method is applied for the duct.The hydrodynamic interaction between the propeller and the duct is solved by an iterative method.A modified trailing vortex wake model of propeller is introduced to describe the distortion and separation of the trailing vortex sheet.By using the present method,the effect factors on the prediction of performance are investigated systematically,and in the meantime boss effect is considered.Numerical calculations are carried out for JD simplified ducted propeller series and JD- CPP series with JD duct.The numerical results are compared with experimental data and good agreement is obtained.