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On the flow field induced by two counter-rotating propellers at varying load conditions
Ocean Engineering ( IF 5 ) Pub Date : 2020-12-29 , DOI: 10.1016/j.oceaneng.2020.108322
Alessandro Capone , Fabio Di Felice , Francisco Alves Pereira

The hydrodynamics of the flow between and in the wake of contra-rotating propellers is investigated experimentally via Particle Image Velocimetry (PIV) at different advanced coefficients. Results show that the flow dynamics is deeply influenced by the interplay between the two systems of helical vorticity that develop in the wake. The forward and aft propellers’ slipstream structure is analyzed in terms of blade loading and relative phase angle. The onset of tip vortex break-up, reconnection and pairing processes occurring within the wake is discussed with a focus on instability mechanisms. Flow field measurements between propellers highlight that the distribution of the tangential component is balanced more effectively by the aft propeller at specific loading conditions.



中文翻译:

在变化的载荷条件下由两个反向旋转的螺旋桨引起的流场

通过粒子图像测速(PIV)在不同的推进系数下,对反向旋转螺旋桨之间和之后的流动进行了流体动力学研究。结果表明,流动动力学受尾流中形成的两个螺旋涡度系统之间相互作用的影响。根据叶片载荷和相对相位角分析了前,后螺旋桨的滑流结构。讨论了尾流中发生的尖端涡旋破裂,重新连接和配对过程的发生,重点是不稳定机制。螺旋桨之间的流场测量结果表明,在特定载荷条件下,后部螺旋桨可更有效地平衡切向分量的分布。

更新日期:2020-12-29
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