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Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel

Record type: Article

This paper describes a photon-counting study of the cavitation luminescence produced by flow over a hydrofoil. This has previously been identified in water saturated with xenon. The four objectives of this study are: to determine whether luminescence can be obtained using air-saturated water; to quantify this emission, if it is present, as a function of flow parameters; to determine whether the photon arrivals occur with random timing, or in ‘bursts’; to put limits on the rates associated with any bursts. The flow experiments were performed in a cavitation tunnel capable of achieving flow velocities of up to about 50 m s-1 in the test section. The experimental hydrofoil was a NACA 009 blade. Parameters varied were the flow velocity, the incident angle of the hydrofoil and the cavitation index. The results show that significant photon counts are recorded when leading-edge cavitation takes place and U-shaped vortices (cavities) are shed from the main cavity. The photon count increases dramatically as the flow velocity increases or the cavitation index is reduced. Departures from a Poisson distribution in the arrival times of photons at the detector suggest the presence of ‘bursts’. These may be related to the way vortices are shed from the main cavity. Limits are inferred on the detection rates associated with bursts.

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Citation

Leighton, T.G., Farhat, M., Field, J.E. and Avellan, F. (2003) Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel Journal of Fluid Mechanics, 480, pp. 43-60. (doi:10.1017/S0022112003003732).

More information

Published date: 2003

Identifiers

Local EPrints ID: 10363
URI: http://eprints.soton.ac.uk/id/eprint/10363
ISSN: 0022-1120
PURE UUID: 7aa4c6f3-5cb6-490e-9b9a-20bb55b8bbf2
ORCID for T.G. Leighton: ORCID iD orcid.org/0000-0002-1649-8750

Catalogue record

Date deposited: 10 Jun 2005
Last modified: 17 Jul 2017 17:07

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