Tip Vortex Cavitation and Induced Noise Characteristics of Hydrofoils

Tip vortex cavitation is one of the most classical themes in fluid mechanics. Although many experimental and theoretical studies have been performed, unsolved problems still remain. In particular, the trailing vortices at the tip of the hydrofoil directly affects the hydrodynamic and acoustic perfor...

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Bibliographic Details
Published in:Applied sciences 2021-07, Vol.11 (13), p.5906
Main Authors: Shin, Suyong, Hong, Ji-Woo, Nagarathinam, David, Ahn, Byoung-Kwon, Park, Sung-Gun
Format: Article
Language:English
Subjects:
Aerodynamic coefficients
Appendages
Cavitation
Cavitation number
Cavity flow
cavity inception
Computed tomography
Experiments
Fluid dynamics
Fluid flow
Fluid mechanics
hydrofoil
Hydrofoils
Imaging techniques
Noise
Pressure distribution
Pressure transducers
Reynolds number
Rudders
Ships
sound pressure level (SPL)
Swirling
tip vortex cavitation (TVC)
Trailing vortices
Velocity
Vortices
Water quality
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Summary:Tip vortex cavitation is one of the most classical themes in fluid mechanics. Although many experimental and theoretical studies have been performed, unsolved problems still remain. In particular, the trailing vortices at the tip of the hydrofoil directly affects the hydrodynamic and acoustic performance of submerged objects such as the marine propeller, rudder and various foil-shaped appendages of the ship. In this study, the experimental results from the measurements of the vortex cavitation from the tip of two different three-dimensional hydrofoils are presented. Experiments have been carried out in Chungnam National University-Cavitation Tunnel (CNU-CT). By high speed imaging technique, the development process of vortex cavitation is observed in detail. Based on the high-speed images, physical features of the cavity inception and the swirling motion of the tip vortex cavity flow are examined. In addition, the induced noise characteristics in the vortex development process are examined by unsteady pressure measurements. The forces exerted on the hydrofoil were also measured using a dynamometer with a view to verify the scaling relation between the inception cavitation number and the non-dimensional parameters namely, the coefficient of lift, CL and the Reynolds number, Re. The results further shed light on the cause of the intense noise induced by tip vortex cavitation.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11135906