Results 91 to 100 of about 628,564 (131)

Passive control of wing-tip vortices through a grooved-tip design. [PDF]

Exp Fluids
Tan J, Ōtomo S, Viola IM, Liu Y.
europepmc   +1 more source

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Effects of duct parameter on pump-jet propulsor unsteady hydrodynamic performance

Ocean Engineering, 2021
Abstract This work aims to investigate the effects of duct parameter on the open water performance of pump-jet propulsor. Five duct parameters are considered, including the length-diameter ratio, the incidence angle, the shrinkage ratio of duct inlet, the expansion ratio of duct outlet and the tip clearance ratio.
Qiaogao Huang, Han Li, Xinguo Dong
exaly   +2 more sources

Assessment of transition modeling for the unsteady performance of a pump-jet propulsor in model scale

Applied Ocean Research, 2021
Abstract The generally adopted strategy to investigate the flow on a pump-jet propulsor (PJP) is in model scale, but the flow is often overestimated as full turbulence in numerical prediction. The effects of transition modeling on the flow around PJP are unknown, which is a potential cause of the obvious deviations of numerical results to ...
Qiaogao Huang, Han Li, Xinguo Dong
exaly   +2 more sources

Numerical analysis of unsteady hydrodynamic performance of pump-jet propulsor in oblique flow

, 2019
In this study, the SST k-omega turbulence model and the sliding mesh technology based on RANS method has been adopted to simulate the exciting force and hydrodynamics of a pump-jet propulsor in different oblique flow angles (0°, 10°, 20°, 30°) and different advance ratio (J=0.95, J=1.18, J=1.58). The full structured grid and full channel model has been
Qiu, Chengcheng, Pan, Guang, Shi, Yao
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Wake flow characteristics and unsteady performance of a pump-jet propulsor under hull condition

Physics of Fluids, 2022
The propulsor is one of the main noise sources of an underwater vehicle. The pump-jet operating under hull condition is in a typical non-uniform strong anisotropic turbulent flow field. In this paper, the wake flow characteristics and unsteady performance of a pump-jet propulsor under hull condition are numerically investigated.
Shuaikang Shi, Wanghao Tang, Xiuchang Huang   +2 more
openaire   +1 more source

Tip-clearance pressure fluctuations between conventional pump-jet propulsor and pump-jet propulsor with rotor blade crown in non-uniform inflow

Physics of Fluids
The suppression of the pressure fluctuations in the tip clearance of the pump-jet propulsor is of great significance in improving its noise radiation level. This study considers adding rotor blade crown structure to propose a new type of pump-jet propulsor.
Lin Xue, Donglin Zou, Chunxiao Jiao, Xiaoqian Dong, Zhongli Zhang, Na Ta, Zhushi Rao   +6 more
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Research on the feature extraction method of secondary flow in pump-jet propulsor

Physics of Fluids
Secondary flow plays a pivotal role in flow separation within turbomachinery, impacting the performance of pump-jet propulsors through associated secondary flow losses. Past research has predominantly concentrated on water wing models, leading to limited insights into more intricate turbomachines.
Xinli Jin, Jianwei Zhang, Pei Xu, Ning Liang, Ning Li, Linlin Cao, Dazhuan Wu   +6 more
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Dynamic mode decomposition and reconstruction of the transient pump-jet propulsor wake

Physics of Fluids
Comprehensively grasping the wake dynamics of pump-jet propulsor (PJP) lies at the core of developing and fine-tuning future PJP design, particularly the exciting forces suppression and noise reduction. In this work, a pre-swirl stator PJP is considered to investigate its wake dynamics and evolution mechanics.
Xinming Li, Han Li, Sijie Zheng, Xing He, Guang Pan, Qiaogao Huang   +5 more
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On the excitation force characteristics of a pre-deformed composite rotor in a pump-jet propulsor

Physics of Fluids
Rotor excitation forces in pump-jet propulsors (PJP) induce low-frequency hull vibrations and amplify flow-induced vibrations, consequently increasing flow-field pressure pulsations and degrading the acoustic performance of the propulsion system. Through rational design, composite rotors can utilize fluid–structure interaction (FSI) effects to mitigate
Zhangtao Chen, Zheng Huang, Zhiyuan Mei, Wenzhi Zhou, Kemin Duan   +4 more
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Numerical calculation method of a co-rotating two-stage pump-jet propulsor

Physics of Fluids
Vibration, noise, and cavitation remain challenges for underwater propulsors. Besides blade design, a multi-stage structure is one of the ways to solve these problems. Based on the concept above, this paper proposes a co-rotating two-stage pump-jet propulsor.
Jianwei Zhang, Ning Liang, Yongle Ding, Jian Li, Linlin Cao, Dazhuan Wu   +5 more
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