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Abstract

The unsteady behaviour of ventilated and natural cavity flows over a 2-D wall-mounted fence is investigated for fixed length cavities with varying free-stream velocity using still imaging, X-ray densitometry and dynamic surface pressure measurement in two experimental facilities. Cavities in both ventilated and natural flows were found to have a re-entrant jet closure, but not to exhibit large-scale oscillations, rather irregular small-scale shedding at the cavity closure. Small-scale cavity break-up was associated with a high-frequency broad-band peak in the wall pressure spectra, found to be governed by the overlying turbulent boundary layer characteristics, similar to observations from single-phase flow over a forward-facing step. A low-frequency peak reflecting the oscillations in size of the re-entrant jet region, analogous to ‘flapping’ motion in single-phase flow, was found to be modulated by gravity effects (i.e. a Froude number dependence).

Item Type:	Conference Publication
Authors/Creators:	Barbaca, L and Pearce, BW and Brandner, PA and Ganesh, H and Ceccio, SL
Keywords:	cavitation, wall-mounted fence, dynamic behaviour
Journal or Publication Title:	Proceedings of the 10th Symposium on Cavitation (CAV2018)
Publisher:	ASME
DOI / ID Number:	10.1115/1.861851_ch14
Copyright Information:	Copyright 2018 ASME
Related URLs:	Google Scholar: Barbaca, L Google Scholar: Pearce, BW UTAS Profile: Pearce, BW Google Scholar: Brandner, PA UTAS Profile: Brandner, PA
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