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An experimental study of unsteady behaviour of cavity flow over a 2-D wall-mounted fence
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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 |
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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 |
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