升力分配系数对螺旋桨正倒车水动力性能影响的数值分析

目的]基于数值模拟方法研究螺旋桨几何参数对其正倒车水动力性能的影响规律。方法]以某33000 DWT成品油轮为应用对象,采用RANS方法并结合Realiazable k-ε湍流模型,对与其相匹配的1个图谱桨与3个理论桨在正车前进和倒车后退工况下的水动力性能进行数值仿真,讨论升力分配系数、螺距与拱度组合方式对螺旋桨正倒车水动力性能的影响规律。结果]结果表明:在正车前进和倒车后退工况下,桨叶剖面螺距对剖面升力的贡献始终为正,拱度的贡献则体现为正负交替,螺旋桨设计时适当增加拱度减小螺距有利于提升其正车前进工况下的敞水效率,反之,采用大螺距小拱度则有利于增大倒车推力。结论]基于研究结果给出了螺旋桨设计中兼顾考虑其正车和倒车性能的若干建议。

Influence of lift distribution coefficient on hydrodynamic performance of propeller in forward and astern mode of operation by numerical analysis

Objectives]The influence of the geometrical parameters of propeller on its hydrodynamic performance in forward and astern mode of operation is studied by numerical simulation.Methods]Taking a 33000 DWT oil product tanker as the application object,the hydrodynamic performance of a MAU-series propeller and three theoretical propellers operated in forward and astern mode is simulated using the RANS method combined with the Realizable k-εturbulence model.The influence of the lift distribution coefficient,pitch and camber combination on the hydrodynamic performance of propeller in both operation modes are then discussed through comparison.Results]The results show that in forward and astern operation mode,the pitch of the blade will generate positive lift,whereas the camber of the blade will generate positive and negative lift alternately.Properly increasing the camber and reducing the pitch of the propeller in design is beneficial for improving its open water efficiency in forward operation mode.On the contrary,adopting the combination of a large pitch and a small camber is beneficial for increasing reverse thrust.Conclusion]Based on the experimental data,suggestions on performace trade-offs of designing a propeller in both operation modes are given.