キャビテーションに対する溶解気体効果の機構

概要

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In order to make clear the mechanism of dissolved gas-content effects on cavitation in this report, the author precisely analyzed statistically the acoustic pressure pulses generated from cavitation in a typical orifice flow and simultaneousely observed the cavitation aspect within the near-desinent cavitation range, for various dissolved CO_2-gas contents in air-undersaturated water. The CO_2 gas was forcibly dissolved in water under the same cavitation-nuclei distribution. Since both the aspect and the corresponding stochastic behavior of the pulses change considerably in comparison with the air-saturated water counterparts, it is concluded that the dissolved gas is not necessarily dircetly related to the cavitation inception. However, if the water is saturated by air or if it has many weak micro air bubbles, the dissolved gas becomes a dominant factor through a typical process, by which the very small nuclei rapidly grow to the well-grown breeded nuclei.
社団法人日本機械学会の論文
1988-08-25