Accession Number : ADA114107

Title :   An Experimental Study of Travelling-Bubble Cavitation Noise.

Descriptive Note : Technical memo.,


Personal Author(s) : Hamilton,M F ; Thompson,D E ; Billet,M L

PDF Url : ADA114107

Report Date : 04 Dec 1981

Pagination or Media Count : 46

Abstract : In this investigation, high-frequency travelling-bubble cavitation noise generated on a Schiebe headform is analyzed with regard to noise theories which are based on the collapse of a single bubble. After normalizing the noise level by an event rate, -sigma C(p(min)) appears to provide a reasonable scaling factor for the noise level radiated per collapse, where sigma is the cavitation number and C(p(min)) is the minimum pressure coefficient on the headform. At frequencies above 10 kHz and free-stream flow velocities between 9.1 and 12.2 mps (30 and 40 fps), the noise level per collapse varied as roughly 1/sigma to the 8.4 power, and was constant with the flow velocity for constant -sigma/C(p(min)). The energy density spectra were flat from 10 to 100 kHz regardless of the cavitation number or free-stream velocity. (Author)

Descriptors :   *Cavitation noise, *Bubbles, Collapse, Free stream, Cavitation, Flow, Wake, Vortices, Electroacoustic transducers, Hydrophones, High pass filters

Subject Categories : Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE