File(s) under permanent embargo
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 BrandnerTip 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 2018Editors
TCW Lau and RM KelsoPagination
1-4ISBN
978-0-646-59784-3Department/School
Australian Maritime CollegePublisher
Australasian Fluid Mechanics SocietyPlace of publication
Adelaide, AustraliaEvent title
21st Australasian Fluid Mechanics Conference 2018Event Venue
Adelaide, AustraliaDate of Event (Start Date)
2018-12-10Date of Event (End Date)
2018-12-13Rights statement
Copyright unknownRepository Status
- Restricted