キャビテーション壊食に及ぼす液体の空気含有度と蒸気圧の影響(流体工学,流体機械)

概要

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Cavitation erosion tests were performed in deaerated and aerated water, in water at various temperatures, in water/ethanol mixtures and in various kinds of organic liquids, the impact loads by collapsing bubbles were measured with the pressure detector. The volume loss curves do not change with the type of water such as deaerated and aerated water, and a similar trend was observed for the results of the pressure distribution. A further increase in the air content decreases the volume loss causing a cushioning effect of bubble collapses. The cavitation erosion increases with increased vapor pressure and reaches a peak, followed by a decrease. The initial increase is due to the increased number of bubbles. Thus, cavitation erosion mainly affected by both air content a and vapor pressure Pν of liquid properties. The volume loss rate can be described as Pν^<0.38>・e^<-0.49a>. A critical rate air content is found to be 1.6, below which the air content does no longer affect the volume loss rate. It was found that the volume loss rate shows a good correlation with ΣF^2_1/(pc), where F_1 is the impact load, p the density and c the sound velocity in the liquid.
一般社団法人日本機械学会の論文
2002-11-25