噴流キャビテーション壊食の低減 : 絞り出口および噴流衝突面近傍形状による流れ場制御

概要

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An experiment related to cavitation erosion was conducted by utilizing submerged cavitating jet rigs. Using seven types of nozzle holders and six different height of cylindrical walls, the effects of geometry of the nozzle outlets and the impinged surfaces on erosion were examined. Tap water and ISO VG32 hydraulic oil were used as the test liquids. The time evolution of mass loss and cross-sectional profiles of the specimens were measured. At the same time, the cavity-clouds of the jets were recorded with a video camera and the pictures were processed with a personal computer. In conclusion, 1) The concave-type surface of the specimens gave a substantial reduction in erosion; 2) Mass loss of the specimens was decreased for a specific geometry of the nozzle outlets; 3) Erosion by use of tap water was markedly more severe than that of the mineral oil, and 4) Correlation between the erosion of the specimens and the processed pictures of the cavitating jets was partially shown.
社団法人　日本フルードパワーシステム学会の論文
2007-11-15