环肋导管桨推进性能分析

Propulsion performance analysis of ring-ribbed ducted propellers

针对常规螺旋桨或导管螺旋桨旋转时水流漩涡运动引起的船舶推进系统能量损失,本文提出一种环肋状结构的33+Kd5-100导管螺旋桨形式用以回收利用该部分能量。基于计算流体力学理论,对导管螺旋桨内壁后半段构造横剖面为三角形的螺旋状环肋结构采用多分区混合型网格划分方法和移动参考坐标系方法,并对其水动力性能与节能效果进行计算评估。结果表明:环肋导管桨的推力系数和扭矩系数相较于常规导管桨能够获得明显提升;在高进速系数推进时,环肋导管桨在推力系数扭矩系数和效率上均有不同幅度的提高;在低进速系数时其推进性能不如常规导管桨。

The vortex motion of water caused by the rotation of conventional propellers or ducted propellers cause energy loss in ship propulsion systems.To recycle this part of the energy,a new type of 33+Kd5-100 duct⁃ed propeller with a triangular cross-section spiral ring rib structure in the rear half of the inner wall of the duct is proposed in this paper.Then,following computational fluid dynamics(CFD)theory,we calculated and evaluat⁃ed the hydrodynamic performance and energy-saving effect of the ducted propeller using the multizone hybrid grid division method and the moving reference frame(MRF)method.The results revealed that compared with conventional ducted propellers,the thrust and torque coefficients of ring-ribbed ducted propellers can be signifi⁃cantly improved.When advancing with high propulsion coefficient,the annular fin ducted propeller has varying degrees of improvement in thrust coefficient,torque coefficient,and efficiency.However,its propulsion perfor⁃mance and efficiency were not as good as those of conventional ducted propellers at low speeds.