114 キャビテーション噴流の挙動観察と壊食実験 : 水道水と石油系作動油との比較

概要

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The behavior of cavitating jets and the intensity of cavitation erosion were correlated experimentally using the cavitating jet apparatus. The cavity-clouds of the jets were observed and recorded with video cameras, the existence-probability distributions of the clouds were obtained by picture processing techniques, and in parallel the cavitation erosion test was performed. Tap water or ISO VG 32 hydraulic fluid was alternatively used at 40±1 ℃. The upstream and down pressures were specified as 10 MPa and 0.1 to 0.3 MPa respectively. The stand-off distance was varied from 7.5 to 3.5 mm. The specimens were made of aluminum alloy, whose diameter was 15 mm. The specimen was eroded severely at a specific probability region; As the downstream pressure decreased, the range of the jet lengthened and the mass loss increased; In comparison with the oil-jet, the water-jet reached at the great distance and eroded the specimens substantially.
社団法人日本機械学会の論文
2002-10-05