A test facility has been constructed for the measurement of
flow noise generated by a rotating cylinder in water. Measurements
were made of radiated flow noise in water for a frequency range of
5 to 80 kiloHertz. The surface velocities of the cylinder were
varied from 44 to 100 fps. The total air content of the water was
varied from 7 to 27 ppm. The radiated flow noise was observed to
increase as the sixth power of the surface velocity for low frequencies.
For high frequencies, the flow noise increased as the
tenth power of the velocity. Release of air bubbles by shear had
no effect on radiated flow noise other than to reduce the measured
level of the noise.
David Taylor Model Basin, Bureau of Ships General Hydromechanics Research Program
S-R009-01-01, and Office of Naval Research Contract Nonr 710(65)
Killen, John M.; Crist, Scott D..
A Study of the Influence of Microbubbles on Hydrodynamic Flow Noise.
St. Anthony Falls Hydraulic Laboratory.
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