Title: Discussion on effect of air-water two-phase flows on flow stability and cavitation erosion
Abstract: Definitions of cavitation bubbles and cavitation cavity are presented and their differences from normal air bubbles of atmospheric pressure are analyzed.Then the possibility of pressure fluctuations intensified by cavitation bubbles of rapid collapse and generation is discussed,and the effects of cavitation bubbles and cavitation cavity in air-water two-phase flows due to their lower pressure and compressibility and the resulting differences are demonstrated.Through an analysis on the composition of vortex rope cavitation cavity in turbine draft tube,based on whether or not a resultant force can be formed by cavitation cavity,the difference between continuum and fragmentariness of vortex rope cavitation cavity and a reason for this difference are discussed.We put forward a new view:pressure fluctuations can strengthen cavitation erosion and even change super-cavitation into a condition of cavitation erosion on flow passage wall.The measured amplitudes of pressure fluctuations are reduced ostensibly through a phenomenon of vortex rope when most part of vortex rope cavitation cavity come in contact with draft tube wall,but such clipping would possibly endanger flow stability more severely.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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