Estimation of Cavitation Bubble Distribution Using Multi-Frequency Acoustic Signals

다중 주파수를 이용한 캐비테이션 기포의 분포량 추정

  • 김대욱 (한양대학교 해양환경과학과 해양음향연구실) ;
  • 나형술 (한양대학교 해양환경과학과 해양음향연구실) ;
  • 최지웅 (한양대학교 해양환경과학과 해양음향연구실) ;
  • 나정열 (한양대학교 해양환경과학과 해양음향연구실) ;
  • 강돈혁 (한국해양연구원)
  • Published : 2009.04.30

Abstract

Distribution of cavitation bubbles relative to change of the sound speed and attenuation in the water was estimated using acoustic signal from 20 to 300 kHz in two cases that cavitation bubbles exist and do not exist. To study generation and extinction property of cavitation bubble, bubble distribution was estimated in three cases: change of rotation speed (3000-4000 rpm), surface area of blade ($32-98\;mm^2$) and elapsed time (30-120 sec). As a result, the radii of the generated bubbles ranged from 10 to $60{\mu}m$, and bubble radius of $10-20{\mu}m$ and $20-30{\mu}m$ was accounted for 45 and 25% of the total number of cavitation bubbles, respectively. And generation bubble population correlated closely with the rotating speed of the blades but did not correlate with the surface area of blade. It was observed that 80% of total bubble population disappeared within 2 minutes. Finally, acoustic data of bubble distribution was compared with optical data.

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