On the mechanism of dissolved gas-content effects upon cavitation.
On the mechanism of dissolved gas-content effects upon cavitation.
复制标题
溶解气体含量对空化影响的机制。
DOI：
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发表时间：
1988
期刊：
影响因子：
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通讯作者：
S. Igarashi
中科院分区：
文献类型：
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作者：
Hideto MlYAKURA;R. Oba;R. Ikeda;S. Igarashi
为了弄清溶解气体含量对空化的影响机理，本文对典型孔口水流中的空化产生的声压脉冲进行了精确的统计分析，同时对空气不饱和水体中不同溶解CO2气体含量的近临界空化范围内的空化情况进行了观测。在相同的空化核分布下，CO2气体被强制溶解在水中。由于脉冲的角度和相应的随机行为与空气饱和的水脉冲相比都有很大的变化，因此可以得出结论，溶解气体与空化的发生没有直接的关系。然而，如果水被空气饱和，或者如果水有许多微弱的微气泡，溶解的气体通过一个典型的过程成为主导因素，通过这个过程，非常小的原子核迅速成长为发育良好的原子核。
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 CO2-gas contents in air-undersaturated water. The CO2 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.