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A submerged cavitating jet is used to erode a specimen placed in its path. The erosion depends primarily on the jet velocity, the downstream pressure, and the standoff distance of the specimen. An apparatus for erosion testing based on this principle is described. Results are presented showing the effect of these parameters on erosion. They indicate that scaling should be carried out on the basis of constant cavitation number. The results show that the method is suitable for cavitation erosion testing and that testing time and jet velocity (and hence the upstream pressure) can be traded one against the other provided that the cavitation number remains constant. In this method, all of the variables can be controlled independently. The method offers the advantages associated with flow-induced cavitation together with the short testing time offered by magnetostriction devices.
erosion, cavitation, liquid jet cutting, scaling
Senior lecturer, University of Nottingham, Nottingham,