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首页> 外文期刊>Journal of marine science and technology >RETRACTED ARTICLE: Numerical investigation to observe combined effect of propeller boss cap fin (PBCF) and propeller duct to improve propeller efficiency
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RETRACTED ARTICLE: Numerical investigation to observe combined effect of propeller boss cap fin (PBCF) and propeller duct to improve propeller efficiency

机译：缩回文章：观察螺旋桨凸轮帽翅片（PBCF）和螺旋桨管道提高螺旋桨效率的数值调查

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摘要

Propeller is the main device in marine vehicle to generate propulsive energy. During practical manoeuvring condition, it losses a major part of energy due to the formation of hub as well as tip vortex. This fact becomes a great concern for researcher and motivates to find some alternate energy saving device (ESD). In this paper numerical investigations, based on Reynolds Average Navier Stokes (RANS) equation, are carried out to observe the combined effect of PBCF and propeller duct as ESDs to improve propeller efficiency. Here, aerofoil shape PBCF with NACA4412 profile has been combined with 19A and 19Am duct to observe their ability to improve propeller efficiency in moving reference frame approach. Along that to make a comparative study, numerical investigations are also performed with propeller and 19A duct without PBCF. Results show that in comparison to the combined effect of PBCF and ducted propeller, only duct (19A) without PBCF plays a prominent role to enhance propeller efficiency by approximately 9.21%. To obtain more details of flow phenomenon, fluctuation of velocity, pressure, vortex strength, etc., at various locations are also investigated. Besides that, the effect of angle of attack of the duct on a PBCF introduced ducted propeller is also investigated numerically.
机译：螺旋桨是在海上运输工具主装置产生的推进能量。在实际操纵条件时，由于轮毂的形成以及端涡流损失的能量的主要部分。这一事实成为研究员和激励了极大的关注，以寻找一些替代的节能设备（ESD）。本文数值研究的基础上，雷诺平均纳维斯托克斯（RANS）方程，都进行了观察PBCF的组合效果和螺旋桨管作为ESD的，以提高螺旋桨效率。这里，翼型形状PBCF与NACA4412轮廓已结合图19A和19Am管以观察它们在移动参考帧的方法来提高螺旋桨效率的能力。沿着做出了比较研究，数值研究也与螺旋桨和19A管不PBCF执行。结果表明，相比于PBCF和导管螺旋桨，只用管道（19A）的无PBCF的综合效应作用突出约9.21％，以提高螺旋桨效率。以获得的流动现象，速度，压力，旋涡强度等的波动，在不同位置的更多细节还研究。除此之外，在PBCF管道的攻角的效果引入导管螺旋桨也数值研究。

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