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Abstract

Tip vortex cavitation inception about an elliptical planform,NACA 0012 hydrofoil is investigated in cavitation tunnel flowsin which cavitation nuclei are deplete and abundant. Tests wereconducted at fixed Reynolds and cavitation numbers. The onset, or inception, of cavitation was induced by increasing theangle of incidence and behaviour was recorded photographically and acoustically. Cavitation inception occurred at a higherincidence in the deplete case compared with the abundant dueto fewer weaker nuclei. It also occurred within a small incidence change for the deplete case, with the appearance of acontinuous, cavitating vortical flow structure. Whereas for theabundant case, inception was intermittent, occurring across alarger incidence range. This was associated with individual nuclei activation events increasing in frequency with increasingincidence. Sound pressure levels increased with inception andcavity development but reduced to a local minimum once thecavity attached to the hydrofoil, increasing thereafter with incidence. Overall sound levels were higher for the abundant casethan for the deplete case.

Item Type:	Conference Publication
Authors/Creators:	Khoo, MTB and Venning, JA and Pearce, BW and Brandner, PA
Keywords:	tip vortex cavitation, inception, acoustic characterisation
Journal or Publication Title:	Proceedings of the 21st Australasian Fluid Mechanics Conference 2018
Publisher:	Australasian Fluid Mechanics Society
Copyright Information:	Copyright unknown
Related URLs:	Google Scholar: Venning, JA UTAS Profile: Venning, JA Google Scholar: Pearce, BW UTAS Profile: Pearce, BW Google Scholar: Brandner, PA UTAS Profile: Brandner, PA
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