Abstract
In the present work,the cavitation bubble cloud and cavitation noise in the contraction-divergence channel have been investigated.With increasing the liquid speed,the bubbles state changes from discrete cavitation cloud to continuous cavitation cloud and the cavitation noise spectrum with broad peak changed to continuous spectrum.The central frequency and value of the peak in the noise spectrum changed with the liquid speed increasing.The integral of the cavitation noise spectrum in [0-50 kHz] shows that the integral valve increased sharply with the liquid speed increasing,and it can indicate the cavitation intensity.There are two kinds of cavitation situation,just like the acoustic cavitation which includes transient cavitation and stable cavitation.
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