导管螺旋桨的推力、进速与诱导速度沿盘面的分布特征

Distribution Characteristics of Thrust, Advanced and Induced Velocity on Ducted Propeller Disk

运用计算流体力学方法对不同工况下导管螺旋桨的推力、转矩以及螺旋桨周围的流场特性进行观察,对导管螺旋桨盘面处的进速、诱导速度沿盘面的分布以及螺旋桨所发出的推力与周围速度场之间的关系进行分析。计算结果表明,由于导管出口处激发出的下游尾涡作用,螺旋桨推力、转矩、盘面的进速以及诱导速度分量的时域过程表现出了一种多次峰谷值振荡变化的动力学特征,轴向进速是影响螺旋桨推力、转矩变化的主要因素。文章结论有助于提高对导管螺旋桨推力产生机理的了解与认识,从而为设计出性能优良导管螺旋桨提供理论指导。

Thrust issued from and torque suffered by a ducted propeller, the flow fluid characteristics around the propeller under different working conditions are observed numerically with computational fluid dynamic（CFD） method, distributions of axial advanced velocity, induced velocities on the propeller disk, and the relationships among propeller thrust and the flow fluid around the propeller are analyzed. The numerical results indicate that the time histories of thrust, torque of the propeller, axial advanced velocity and induced velocities on the propeller disk manifest a dynamic nature of multiple peak-to-valley value oscillations due to the trailing vortex agitation at the exit of the duct. The axial advanced velocity is the dominant factor affecting the variations of thrust and torque of the propeller. The results of the paper help enhance the understanding of the thrust mechanism issued from a ducted propeller, and provide a theoretical guideline to design a better propeller.