Cavitation is the dominant source of noise for cavitating propellers. It is generally agreed that the growth and collapse of cavitation bubbles creates a monopole acoustic source mechanism, which radiates sound in an omnidirectional pattern from the oscillating bubble. Hydrodynamic flows about propellers produce other types of cavitation besides bubble cavitation. Vortex cavitation occurs in the concentrated tip and hub vortices, and sheet cavitation can occur at the propeller blade leading edge. Each of these types of cavitation may have different acoustic source strengths and source spectra. A propeller drive apparatus has been built at the Acoustics Barge at the Defence Research Ebtablishment Atlantic. The fully instrumented barge is located in Bedford Basin, a large soft-bottom salt-water body of water near Halifax. A stationary propeller drive pod and near and far-field hydrophones are fixed to and suspended from the barge. Propellers designed to produce various types of cavitation have been tested in this facility.


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    Title :

    Propeller cavitation noise investigations in a free-field environment


    Additional title:

    Kavitationsgeraeusche von Propellern in freiem Feld


    Contributors:

    Published in:

    Publication date :

    1982


    Size :

    37 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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