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Comparisons between model-and full-scale propeller cavitation patterns sometimes show noticeable differences in both extent and kind.This paper describes an improved method for cavitation tests of model propellers in a cavitation tunnel by the application of roughness at the leading edge of blades.In the basic study, the flow visualization on the propeller blade and propeller open water tests were conducted.Model tests of cavitation were carried out in the cavitation tunnel. Investigations were made into the correlation between the cavitation pattern and the flow on the blade as well as the effects of roughness and air content on cavitation.Finally the model test results were evaluated in comparison with the full-scale observations, and the present method was implied to be very useful for cavitation study of the propeller in the full-scale conditions.

Model Testing of Propeller Cavitation by Roughening the Leading Edge of Blades