Experimental and computational capture of high frequency oscillation induced by inception cavitation in submerged shear layer

Abstract

Cavitation is a peculiar phenomenon in the liquid medium flow, which is the phenomenon of that the local pressure in the flow field is lower than the local vaporization pressure. It’s well-known that bubble collapse will cause high pressure oscillation in flow, which is the fundamental of the cavitation. In present study, 200 kHz high frequency pressure transducer is used to capture the pressure oscillation induced by inception cavitating bubble in submerged shear layer of axis-symmetric cavity. Consistent with boundary conditions in experimental measurement, large eddy simulation (LES) and Schnerr-Sauer (S-S) cavitation model are employed to simulate inception cavitation flow at condition Re=2×105 and σ=0.59. The computational results show good agreement with experimental results. The cavitating bubble is slender, just like “rice grain shape”, and the collapse of bubble induces the instantaneous and significantly pressure fluctuation in cavity.