TY - JOUR
T1 - Acoustic measurements of bubbles in the wake of ship model in tank
AU - Sutin, A.
AU - Benilov, A.
AU - Roh, H. S.
AU - Nah, Y. I.
PY - 2008
Y1 - 2008
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84874854337&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84874854337&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:84874854337
SN - 2226-5147
SP - 4873
EP - 4878
JO - Proceedings - European Conference on Noise Control
JF - Proceedings - European Conference on Noise Control
T2 - 7th European Conference on Noise Control 2008, EURONOISE 2008
Y2 - 29 June 2008 through 4 July 2008
ER -