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Statistical aspects of tip vortex cavitation inception and desinence in a nuclei deplete flow

Citation

Khoo, MT and Venning, JA and Pearce, BW and Brandner, PA, Statistical aspects of tip vortex cavitation inception and desinence in a nuclei deplete flow, Experiments in Fluids, 61 Article 145. ISSN 0723-4864 (2020) [Refereed Article]


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Copyright Statement

Crown 2020

DOI: doi:10.1007/s00348-020-02967-x

Abstract

Tip vortex cavitation (TVC) inception and desinence behaviour of a NACA 0012 cross section, elliptical hydrofoil is investigated from a statistical perspective in a cavitation tunnel. Measurements were made for incidences from 4 to 16 and Reynolds numbers from 1.0 106 to 2.1 106. The statistics of TVC inception were quantified by taking repeated measurements of the time until the appearance of a tip vortex cavity for a range of fixed incidences. In other experiments, the angle of attack was continuously increased until inception and then decreased until desinence for a range of fixed cavitation numbers. The data were primarily acquired via an automated process using a laser and photodiode to detect the presence of a cavity. Measurements show that TVC inception in a nuclei deplete flow is a probabilistic process for which a large dataset is required for accurate characterisation. The probability of ingesting and activating a nucleus increases with time at a given test condition due to the increased volume of water exposed to low pressures. TVC desinence exhibits far less statistical variation than inception and is largely independent of the natural nuclei population. It does, however, exhibit hysteresis which is dependent on the topology of the cavitating flow. For the desinence of unattached cavitation, there is a small hysteresis between the inception and desinence indices. However, desinence is delayed for attached cavitation.

Item Details

Item Type:Refereed Article
Keywords:hydrodynamics, tip vortex cavitation, nucleation, cavitation
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Ship and platform structures (incl. maritime hydrodynamics)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Khoo, MT (Mr Matthew Khoo)
UTAS Author:Venning, JA (Dr James Venning)
UTAS Author:Pearce, BW (Dr Bryce Pearce)
UTAS Author:Brandner, PA (Professor Paul Brandner)
ID Code:139285
Year Published:2020
Web of Science® Times Cited:2
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2020-06-05
Last Modified:2020-07-30
Downloads:2 View Download Statistics

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