Stochastic Behavior (Randomness) of Acoustic Pressure Pulses in the Near-Subcavitating Range : Fluids Engineering

Abstract

To clarify the stochastic (random) behavior of cavitation in the near-sub-cavitating range, we statistically analyzed the acoustic pressure pulses generated from cavitation, and discussed subcavitation by introducing the threshold level selected for pulse detection for various states of test water, as well as the behavior of cavitation bubbles. We found : (i) the stochastic behavior is remarkably observed for a selected higher threshold level, and (ii) after the bubble cloud is initiated, the pulse energy directly related to eroslon deviates from the n-th power of cavitation number, σ, and decreases rapidly with σ.