1008 過渡的キャビテーションと音響キャビテーション・ノイズ(OS10-2 産業界における非定常現象,オーガナイズドセッション)

概要

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Numerical simulations of acoustic cavitation noise have been performed taking into account a finite lifetime of a cavitation bubble due to non-spherical oscillation of the bubble shape. The results have indicated that transient cavitation bubbles with relatively short lifetimes result in the broad-band noise. Furthermore, numerical simulations have been performed for various ambient radii of bubbles and various acoustic amplitudes. The results have indicated that a bubble pulsates temporally non-periodically only for a narrow restricted range of ambient radius and acoustic amplitude. It suggests that the broad-band noise is not mainly due to non-periodic pulsation of bubbles but due to the short lifetimes of transient cavitation bubbles. In other words, temporal fluctuation in the number of bubbles results in the broad-band noise.
社団法人日本機械学会の論文
2009-11-06