Abstract
The present work deals with an original study of vibration signals induced by unsteady cavitating flow of polymer solutions through a Venturi section. A blow-down Venturi experimental rig was utilized to generate cavitation in polymer solutions. The cavitating flows through the Venturi tunnel were captured by high-speed photography. The accelerometer was mounted on the upper wall of Venturi tunnel to gather the cavitation induced vibration accelerations. Results show that the morphologies of cavitation bubbles in polymer solutions are different from that of filtered water. Cavitation bubbles with bigger size and less number are observed in polymer solutions cavitating flow. It is observed that the peak value, kurtosis and the root-mean-square of vibration acceleration increase in polymer solutions. Meanwhile, a broader frequency band and a higher power spectral density level is observed in spectrogram of polymer solutions. It is inferred that the collapse of the vaporous cavity clouds with high void fraction developed in polymer solutions is responsible for this alteration.
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