高速水中水噴流の壊食の発達過程

概要

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High-Speed submerged water jets have two characteristic peaks with respect to the stand-off distance, in the same manner as high-speed water jets in air. In order to clarify the behavior of the impulsive pressures at these two peaks, we systematically carried out erosion tests using an aluminum-alloy specimen in a wide range of the injection pressure P_1 from 10 to 70 MPa, and microscopically observed the eroded surfaces by SEM. We find that the mass loss rate Δm^^・ at the 1st peak is decidedly due to the water-column impact, so that it is very sensitive to the injection pressure P_1, while Δm^^・ at the 2nd peak is due to the shock pressures of cavitation bubble collapse, so that it is not necessarily sensitive to P_1. We also indicate that the form and the speed of erosion change markedly with the differences in the jet structure with the stand-off distance x/D.
社団法人日本機械学会の論文
1994-03-25