キャビテーション壊食に関連する渦キャビティ圧壊挙動の観察 : 特に, 三角柱まわりのNear-Wakeにおいて〔流体工学, 流体機械〕

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It is known that erosion of fluid machinery can be caused by collapes of a cavitation bubble under high speed flow conditions. To solve this cavitation erosion problem, we performed some experiments on the cavitation process from a subcavitation to a supercavitation stage with a measurement system combining a high-speed video camera and an impulsive pressure sensor. This study focuses in particular on a vortex cavitation bubble in the near wake of a triangular body at the partially cavitating stage which is well known as a highly erosive pattern. Erosion tests were conducted regarding the mechanism of highly impulsive force generation, and bubbl collapsing behaviors were observed. The results show that three characteristic patterns of bubble collapse and erosion occur within the near-wake region.
1997-12-25