絞りに起因するスラグ流による騒音の実験的研究(流体工学,流体機械)

概要

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Noise problems caused by two-phase flows in tubes connected to air-cooled heat exchangers have become more serious, since the level of air conditioner fan noise has decreased. In particular, when a slug flow occurs, the noise level greatly increases. In this study, an air-water two-phase flow was used to create a slug flow through a capillary tube in order to investigate the mechanism of the noise. We also investigated the relationship between the gas bubble state and the pressure pulsation by changing the void fraction. The results show that the pressure pulsation level, which is proportional to the noise level, is determined by the magnitude and the density of the impact pressure pulsation caused by the expansion of the gas at the end of the capillary tube.
社団法人日本機械学会の論文
1997-07-25