水下推进器导管前、后段长度对水动力性能的影响

Influence of Front and Back Length of Under-Water Thruster Duct on Hydrodynamic Performance

为了提高导管螺旋桨的效率,本文基于SST k-ω模型和运动参考系技术(MRF),采用计算流体力学(CFD)的方法对不同长度的矩形剖面导管螺旋桨式水下推进器的水动力特性进行数值计算与分析。结果表明:随着导管前端或后端的延长,对于不同的螺旋桨桨叶曲面特征,水动力性能的变化趋势也会有所不同,总体上,导管前端长度的变化对推进器水动力特性的影响比导管后端的大,当导管两端延长相同的长度时,导管螺旋桨的水动力性能与仅延长导管前端时更接近,并且导管前、后端长度存在最优比例。研究结果能够为导管螺旋桨式水下推进器结构的优化设计提供一定参考。

In order to improve the efficiency characteristics of ducted propeller, based on the SST k-ω model and moving reference frame (MRF), the hydrodynamic characteristics of rectangular section ducted propeller with different lengths were numerically calculated and analyzed by computational fluid dynamics (CFD). The results show that with the extension of the front end of the duct or the back end of the duct, the variation trend of hydrodynamic performance will be different for different blade surface characteristics. In general, the change of the length of the front end of the duct has a greater impact on the hydrodynamic characteristics of the propeller than that of the back end of the duct. When both sides of the duct are extended by the same length, the hydrodynamic performance of the ducted propeller is more similar to that when only the front end of the duct is extended and there is an optimal ratio of the length of the front end and the back end of the duct. The research results can provide some reference for the optimization design of ducted propeller underwater propeller structure.