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Alessandro Capone, Francisco Alves Pereira and Fabio Di Felice
The design of super-cavitating propellers takes advantage of the development of air cavities on the blades? surface to reduce drag and, ultimately, increase efficiency. The mechanism of flow modification induced by the development of a cavity on the prop...
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Youngkuk Yoon and Seung Jin Song
Cavitation instabilities can induce axial and circumferential vibrations, as well as noise in turbopump inducers. Therefore, the purpose of the present study is to investigate the mechanism of cavitation instability. The flow field near the two-bladed in...
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Xidi Zhang, Zhihua Liu, Liushuai Cao and Decheng Wan
The occurrence of a tip leakage vortex (TLV) is a special phenomenon of ducted propellers, which has a significant influence on the propeller?s hydrodynamic performance and efficiency. The inception, evolution, and instability of the TLV under different ...
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Chengcheng Qiu, Qiaogao Huang and Guang Pan
The cavitation performance of an oblique flow field is different from that under a pure axial flow field. This study analyzed the hydrodynamic performance, bearing force, and tip clearance flow field under different rotating speeds and different cavitati...
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Julian Kimmerl, Paul Mertes and Moustafa Abdel-Maksoud
Methods to predict underwater acoustics are gaining increased significance, as the propulsion industry is required to confirm noise spectrum limits, for instance in compliance with classification society rules. Propeller?ship interaction is a main contri...
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Hu Zhang, Jun Wang, Desheng Zhang, Weidong Shi and Jianbo Zang
To understand the effect of cavitation on the tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using the shear-stress transport (SST) k?? turbulence model and the Zwart?Gerber?Belamri cavitation model. In this work, two ...
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Hu Zhang, Jianbo Zang, Weidong Shi and Desheng Zhang
To understand the formation mechanism and evolution process of the perpendicular cavitation vortex (PCV) of an axial flow pump for off-design conditions, turbulent cavitating flows were numerically investigated using the rotation curvature-corrected shea...
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Batuhan Aktas, Naz Yilmaz, Mehmet Atlar, Noriyuki Sasaki, Patrick Fitzsimmons and David Taylor
This study aims to demonstrate the merits of pressure-relieving holes at the tip region of propellers, which is introduced as ?PressurePoresTM? technology as a retrofit on marine propellers to mitigate tip vortex cavitation noise for a quieter propeller....
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Seungnam Kim and Spyros A. Kinnas
Reducing the on-board noise and fluctuating pressures on the ship hull has been challenging and represent added value research tasks in the maritime industry. Among the possible sources for the unpalatable vibrations on the hull, propeller-induced pressu...
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Garam Ku, Cheolung Cheong, Ilryong Park and Hanshin Seol
In this study, the high-fidelity numerical methods are developed to investigate the tip vortex cavitation (TVC) inception and noise of underwater propellers, namely, Model-A and Model-B, which are designed to investigate the effects of sweep angle on cav...
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