Abstract
In many types of cavitating flows, the radiated sound is ascribable to the growth and collapse of individual spherical cavities occurring in random sequence. The equations of hydrodynamics and acoustics allow the bubble growth and collapse paths and the radiated pressure to be computed for representative flow fields. A result derived by Gilmore (Hydrodynamics Laboratory, California Institute of Technology, Report No. 26-4) allows the effects of compressibility of the liquid to be included up to near-sonic wall velocities at collapse. The wave form of the radiated pressure pulses and the associated frequency spectra are given for various values of parameters describing the growth and rebound of the cavity, compressibility of the liquid, and permanent gas content of the cavity. Quantitative expressions for the spectrum of continuous noise radiated in real situations are given, and values derived therefrom are compared with available experimental data.
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