Acoustic measurements of bubbles in the wake of ship model in tank

A. Sutin, A. Benilov, H. S. Roh, Y. I. Nah

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

The interest in bubble generation by moving ships is due to the fact that the large bubble wake areas, which can reach several kilometers, can be used for ship detection. The laboratory towing tank experiments with selfpropelled model ship models enabled the collection of a large data set in controlled conditions, which can be used for development and validation of the theory of bubbles and turbulent ship wakes. Bubble concentrations in various spatial points was measured by using the attenuation of the ultrasonic sweep signal in the frequency band from 100 to 800 kHz between two acoustic sensors placed at a distance 20cm. The attenuation of sound produced by bubbles was observed for several minutes after model of ship passed the point of measurement. The attenuation was recalculated to the bubble size distribution for bubbles from 4 to 32 microns using the theory of resonance bubble attenuation. The dependencies of bubble concentration of model ship speed and type of propeller were investigated. A theory describing the dynamics of wake turbulence based on the shear-free turbulent wake was developed. The measured reduction of bubble concentration as a function of time was in good agreement with the developed theory.

Original languageEnglish
Pages (from-to)4873-4878
Number of pages6
JournalProceedings - European Conference on Noise Control
StatePublished - 2008
Event7th European Conference on Noise Control 2008, EURONOISE 2008 - Paris, France
Duration: 29 Jun 20084 Jul 2008

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