キャビテーションを伴う対向式水中水噴流における気泡雲崩壊挙動 : 流体工学,流体機械

概要

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The collapsing behavior of bubble clouds in cavitating counter jets was investigated to expect the extension of collapsing area and increase in impulsive pressure. We carefully observed the aspects of cavitation clouds with the high-speed video and analyzed such characteristics of cavitation noise as acoustic power and spectrum based on the cavitation noise measured around the jet. It was found that the magnitude of bubble clouds around the impingjng area depends on the distance between two nozzles. The clouds expand more widely in a case of the standoff distance x_s/d=70, where x_s is the half distance between two nozzles, under the test condition of injection pressure P_I=30 MPa. And it was also found that string-like bubbles exist within the impinging area, which result in relatively high impulsive pressure in the case of x_s/d=190. The acoustic power calculated based on high frequency components of noise also shows relatively high values when x_s/d=70.
社団法人日本機械学会の論文
2001-04-25