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An experimental study of cavity flow over a 2-D wall-mounted fence in a variable boundary layer
Citation
Barbaca, L and Pearce, BW and Brandner, PA, An experimental study of cavity flow over a 2-D wall-mounted fence in a variable boundary layer, International Journal of Multiphase Flow, 105 pp. 234-249. ISSN 0301-9322 (2018) [Refereed Article]
Copyright Statement
Copyright 2018 Elsevier Ltd.
DOI: doi:10.1016/j.ijmultiphaseflow.2018.04.011
Abstract
Ventilated and natural cavity flow over a 2-D wall-mounted fence immersed in a boundary layer is experimentally investigated in a cavitation tunnel. Cavity topology, upstream wall pressure distribution and the resulting hydrodynamic forces were determined as a function of ventilation rate, fence immersion in the oncoming boundary layer and free-stream conditions. Cavities exhibit a typical re-entrant jet behaviour, which is the primary mechanism of air/vapour entrainment into the main flow. Some entrainment is also observed via the turbulent break-up at the cavity surface, the intensity of which increases with deeper immersion of the fence within the wall boundary layer. A similar cavity topology, apart from some difference in the wake, is observed for ventilated and natural cavities at the same flow conditions. This similarity is also present in the relations between all other parameters investigated. It was found that with a decrease in cavitation number lift (i.e. force normal to the wall) increases and drag (i.e. force normal to the fence) decreases, resulting in an increased hydrodynamic efficiency of the wall/fence system. With an increase in fence immersion in the boundary layer, lift and drag both increase at the same rate, resulting in a constant lift-to-drag ratio.
Item Details
Item Type: | Refereed Article |
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Keywords: | cavitation, ventilation, wall-mounted fence, experiment |
Research Division: | Engineering |
Research Group: | Maritime engineering |
Research Field: | Ship and platform structures (incl. maritime hydrodynamics) |
Objective Division: | Manufacturing |
Objective Group: | Transport equipment |
Objective Field: | Nautical equipment |
UTAS Author: | Barbaca, L (Dr Luka Barbaca) |
UTAS Author: | Pearce, BW (Dr Bryce Pearce) |
UTAS Author: | Brandner, PA (Professor Paul Brandner) |
ID Code: | 126851 |
Year Published: | 2018 |
Web of Science® Times Cited: | 10 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2018-06-28 |
Last Modified: | 2018-11-26 |
Downloads: | 0 |
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