Jet cavitation

Single-phase data are utilized to study noise generated by submerged jet cavitation. The relation between the structure of the turbulent jet and the time-average and fluctuating characteristics of the flow is analyzed. The two-point velocity correlations reveal information about the eddies convected in the mixing layer, and the field of fluctuating velocity conforms to Taylor's hypothesis of a frozen pattern of turbulence. The structure of the fluctuating pressure field is examined. The effect of the cavitation nuclei on the tensile strength of the liquid of a submerged liquid jet is investigated. The equations used to estimate the average frequency at which negative pressure peaks occur, their duration, and amplitude probability distribution based on the statistical theory of cavitation in turbulent flow are explained. An experimental study of the noise from jet cavitation which examines the sound pressure level is presented. The theoretical and experimental data are compared. It is observed that jets are sensitive to externally applied pressure fluctuating at the characteristic frequency of the turbulence in the flow and based on the scaling law an effective cavitation number is calculated.