Artificial thickening and thinning of cavitation tunnel boundary layers

Belle, A; Brandner, PA; Pearce, BW; Graaf, KL De; Clarke, David B.

doi:10.1016/j.expthermflusci.2016.05.007

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…Air is supplied through the fore-body of the fence to the manifold, from which it is distributed into the wake of the fence through 40 × φ 2 mm equi-spaced stream-wise outlets. The fence is located 230 mm from the test section entrance, with the oncoming wall boundary layer thickness at this stream-wise position being 15 mm [4], giving a boundary layer thickness to fence height ratio of δ /h = 1.5. An array of six flush-mounted 8.1 mm diameter FUTEK PFT510 dynamic pressure sensors installed within the testsection ceiling window was used for the measurements of unsteady pressure within the cavity closure region.…”

Section: Experimental Overviewmentioning

confidence: 99%

An Experimental Study of Unsteady Behaviour of Cavity Flow Over a 2-D Wall-Mounted Fence

Barbaca¹,

Pearce²,

Brandner³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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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 singlephase flow, was found to be modulated by gravity effects (i.e. a Froude number dependence).

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Section: Experimental Overviewmentioning

confidence: 99%

An Experimental Study of Unsteady Behaviour of Cavity Flow Over a 2-D Wall-Mounted Fence

Barbaca¹,

Pearce²,

Brandner³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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“…Maynes et al (2013) carried out an experimental investigation of the onset of cavitation caused by water flow through perforated plates of different thickness and flow area to pipe area ratio at high velocity. Belle et al (2016) found that jet velocity had an obvious effect on cavitation inception and noise, it must be minimized to optimize cavitation limits. Dawoodian et al (2015) investigated bubble dynamics near a perforated plate employing a combined boundary element-finite difference method in a vertical cylinder.…”

Section: Introductionmentioning

confidence: 99%

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

Fang

Wang

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Perforated plates are prevalently used in various integrated energy systems for flow restriction, vibration, and noise reduction. The characteristics of flow energy transfer and loss in perforated plates have a significant impact on its piping systems. The existing design and previous studies largely paid little attention to the characteristics of flow energy variation, resulting in severe performance issues and energy consumption. In this study, the characteristics of energy transfer and loss of cavitation flow with various pressure ratios in single and multi-stage perforated plates were numerically studied. The parameters of energy ratio and energy gradient were developed to effectively evaluate the degree and rate of flow energy variation. Results showed that the contribution to energy loss generated from orifice outlet was relatively larger than the inlet and that the degree and rate of energy variation deceased with the increasing stages during the flow in multi-stage models. Additionally, increased stages of perforated plate resulted in a multi-stage stepped energy drop in throttling orifices, and lead to obvious suppression of the cavitation. This work intends to provide references to cavitation control and energy consumption optimization in piping systems using a perforated plate.

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Numerical prediction of ventilated planing flat plates for the design of Air Cavity Ships

Cucinotta

Nigrelli

Sfravara

2017

Int J Interact Des Manuf

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Artificial thickening and thinning of cavitation tunnel boundary layers

Cited by 9 publications

References 13 publications

An Experimental Study of Unsteady Behaviour of Cavity Flow Over a 2-D Wall-Mounted Fence

An Experimental Study of Unsteady Behaviour of Cavity Flow Over a 2-D Wall-Mounted Fence

3D numerical investigation of energy transfer and loss of cavitation flow in perforated plates

Numerical prediction of ventilated planing flat plates for the design of Air Cavity Ships

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