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Nucleation and cavitation number effects on tip vortex cavitation dynamics and noise

Citation

Khoo, MT and Venning, JA and Pearce, BW and Brandner, PA, Nucleation and cavitation number effects on tip vortex cavitation dynamics and noise, Experiments in Fluids, 62 Article 216. ISSN 1432-1114 (2021) [Refereed Article]

Copyright Statement

Crown 2021

DOI: doi:10.1007/s00348-021-03308-2

Abstract

The spatial and acoustic characteristics of tip vortex cavitation (TVC) inception were measured in a cavitation tunnel. Numerous cavitation events were recorded to reveal the influence of different nuclei populations and cavitation numbers on nuclei capture and activation physics, and the role of the streamwise pressure distribution in a vortex. Synchronised high speed video and hydrophone measurements of cavitation events were taken in the trailing vortex of an elliptical hydrofoil at an incidence of 6 and a Reynolds number of 1.5 106. The injected nuclei population in the tunnel test section was varied by using different microbubble generators mounted upstream of the test section. Both the nuclei population and cavitation number have a significant effect on the inception location distribution along the trailing vortex, and in particular, inception event rates. The cavitation number alters the flow volume subjected to tension, thereby also affecting the shape of the inception location distribution. Once the nuclei are activated, cavity kinematic and acoustic properties are influenced by the local pressure (i.e. inception location and cavitation number) more so than initial nucleus size, at least in the ∼50100 μm diameter range considered in this study. Inception events that occur near the tip generate stronger acoustic pulses. At these inception locations, the frequency of the tonal peak associated with inception remains relatively constant for the two nuclei populations, but increases with cavitation number. This study provides insights into the roles of nucleation and cavitation number in TVC and informs future measurements and predictions of TVC dynamics and noise.

Item Details

Item Type:Refereed Article
Keywords:cavitation, nucleation, tip vortex, dynamics, noise
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Khoo, MT (Mr Matthew Khoo)
UTAS Author:Venning, JA (Dr James Venning)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:147995
Year Published:2021
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2021-11-26
Last Modified:2022-01-12
Downloads:0

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