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Effects of a nozzle on the propeller wake in an oblique flow using modal analysis

Published online by Cambridge University Press:  16 March 2023

Tianyuan Wang Open the ORCID record for Tianyuan Wang [Opens in a new window] ,
Hongda Shi Open the ORCID record for Hongda Shi [Opens in a new window] ,
Ming Zhao Open the ORCID record for Ming Zhao [Opens in a new window]  and
Qin Zhang Open the ORCID record for Qin Zhang [Opens in a new window]
Tianyuan Wang
Affiliation:
College of Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, PR China
Hongda Shi
Affiliation:
College of Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, PR China Shandong Provincial Key Laboratory of Ocean Engineering, 238 Songling Road, Qingdao 266100, PR China Pilot National Laboratory for Marine Science and Technology (Qingdao), 1, Wenhai Road, Aoshanwei, Jimo, Qingdao 266237, PR China Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China, Qingdao 266100, PR China
Ming Zhao
Affiliation:
School of Computing, Engineering and Mathematics, Western Sydney University, Penrith, NSW 2751, Australia
Qin Zhang*
Affiliation:
College of Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, PR China
*
† Email address for correspondence: zhangqin2000@ouc.edu.cn
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Abstract

The effect of a nozzle on the wake dynamics of a four-bladed propeller operating in an oblique flow is investigated via modal decomposition and flow visualization of the results obtained from numerical simulations using delayed detached eddy simulations. The wake characteristics and destabilization mechanisms of a non-ducted propeller (NP) and ducted propeller (DP) in axisymmetric and oblique flow conditions are systematically analysed. The wake characteristics on the windward side are very different from those on the leeward side in an oblique flow, and the nozzle has a crucial role in mitigating the asymmetry and weakening the wake deflection. More destabilization mechanisms are present in an oblique flow than in an axisymmetric flow, including the asymmetric evolution and destabilization of the helixes on the windward and leeward sides of the NP wake, the interaction between the vortex shedding and the helixes in the DP leeward region, and the generation of a tube-shaped wake envelope around the nozzle and its rolling-up. Moreover, the effect of the nozzle on wake meandering is discussed based on modal analysis.

JFM classification

Vortex Flows: Vortex instability Vortex Flows: Vortex interactions Turbulent Flows: Turbulence simulation

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JFM Papers
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Journal of Fluid Mechanics , Volume 959 , 25 March 2023 , A14
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© The Author(s), 2023. Published by Cambridge University Press

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