桨-舵间距对其组合系统水动力性能的影响

本文通过CFD方法对敞水桨、桨-舵组合以及优化间距的桨-舵组合装置开展了数值仿真研究，分析了桨-舵间距对其组合系统的水动力性能影响。螺旋桨敞水工况的计算值与物理模型试验值吻合良好，验证了数值计算方法的可行性。通过对比桨-舵间距大于推荐值的三个工况，发现在较低进阶系数下系统的节能效率有稍许增加，然而随着间距的增大，节能效率呈现降低的趋势；在高进阶系数下，随间距增大节能效率逐步降低。适当减小桨-舵间距，在较低和中等进阶系数下，随间距减小节能效率呈现逐步升高的趋势，在间距减少10mm时，组合体的节能效率最大可增加1.937%；不过在高进阶系数下，随间距减小节能效率却有下降趋势。

Study on effect of propeller-rudder space on hydrodynamic performance of their composite system

Numerical simulations about the hydrodynamic performance of propeller, combination system of propeller-rudder as well as the space optimized propeller-rudder system were carried out via CFD method. It is found that the calculated results agree well with those from model test. Thus it verifies the feasibility of the proposed numerical calculation method in the case of propeller testing in open water situation. By comparing three kinds of operating conditions where propeller-rudder space is greater than the recommended value, it is found that the energy-saving efficiency of the composite system of propeller-rudder is slightly increased under low order coefficients; however it begins to decreases with the increase of propeller-rudder space. On the other hand, the energy-saving efficiency decreases gradually in higher order coefficient. If the propeller-rudder space decreases to a proper range, the energy efficiency gradually increases with the decrease of the propeller-rudder space in the case of lower and the middle order coefficients. When the propeller-rudder space is decreased by 10mm, the energy efficiency of the combined system may be increased by 1.937%. However, the energy-saving efficiency decreases with decrease of propeller-rudder in the higher order coefficient.