軸対称物体のキャビテーションを伴うすきま流れ振動 : 自励振動に及ぼすすきま入口の角部丸めの影響

概要

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In this study, the effect of rounding a corner at the inlet of narrow passage on self-excited vibrations in cavitating leakage flow was investigated. For changing downstream pressure, lift and so forth, characteristics of the vibrations were mainly evaluated using the frequency spectrum of acceleration of the axisymmetric body. From the experimental results, the following conclusions were obtained. When nondimensional R_h (the radius of curvature at the inlet divided by the width of the passage) is not 0.0, but 0.08, the self-excited vibrations become most intense because of the difference in lump of bubbles at the wake. In the case of very large R_h such as 2.4, if the cavitation number approaches 0.1, self-excited vibrations occur, in spite of the fact that cavitation bubbles are not visible in passage. However, the intensity of the vibrations is very small compared with the that at small R_h, in which case the divergent passage is formed by the cavitation bubbles due to separation at the inlet.
一般社団法人日本機械学会の論文
1993-12-25