Abstract
In this study, the erosion pattern, pits, and shockwave formation of a cavitating jet were experimentally observed to gain an understanding of the erosion mechanism of a cavitating jet discharging from a cavitator nozzle into a still water environment. The erosion pattern and formation of pits were visualized by direct imaging on the eroded material surface, while the shockwave initiation points were detected using the cross-schlieren visualization method, combined with two orthogonal high-speed observations near the wall. The experimental results indicated that the radial distributions of the erosion depth, number of pits, and shockwave initiation points were highly correlated. These results provided direct evidence of the cavitation erosion caused by the formation of pits that resulted from the shockwave generated by the periodic cloud collapse event near the wall. The results also demonstrated that the growth of the cavitation erosion volume is highly correlated with the number of pits formed rather than the diameters of the pits.
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