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Nucleation effects on hydrofoil tip vortex cavitation

conference contribution
posted on 2023-05-23, 14:21 authored by Khoo, MT, James VenningJames Venning, Bryce PearceBryce Pearce, Paul BrandnerPaul Brandner
Tip vortex cavitation inception about an elliptical planform, NACA 0012 hydrofoil is investigated in cavitation tunnel flows in which cavitation nuclei are deplete and abundant. Tests were conducted at fixed Reynolds and cavitation numbers. The onset, or inception, of cavitation was induced by increasing the angle of incidence and behaviour was recorded photographically and acoustically. Cavitation inception occurred at a higher incidence in the deplete case compared with the abundant due to fewer weaker nuclei. It also occurred within a small incidence change for the deplete case, with the appearance of a continuous, cavitating vortical flow structure. Whereas for the abundant case, inception was intermittent, occurring across a larger incidence range. This was associated with individual nuclei activation events increasing in frequency with increasing incidence. Sound pressure levels increased with inception and cavity development but reduced to a local minimum once the cavity attached to the hydrofoil, increasing thereafter with incidence. Overall sound levels were higher for the abundant case than for the deplete case.

History

Publication title

Proceedings of the 21st Australasian Fluid Mechanics Conference 2018

Editors

TCW Lau and RM Kelso

Pagination

1-4

ISBN

978-0-646-59784-3

Department/School

Australian Maritime College

Publisher

Australasian Fluid Mechanics Society

Place of publication

Adelaide, Australia

Event title

21st Australasian Fluid Mechanics Conference 2018

Event Venue

Adelaide, Australia

Date of Event (Start Date)

2018-12-10

Date of Event (End Date)

2018-12-13

Rights statement

Copyright unknown

Repository Status

  • Restricted

Socio-economic Objectives

Emerging defence technologies; Maritime; Expanding knowledge in engineering

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    University Of Tasmania

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