소음진동 (Journal of KSNVE)

한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
권호 표지

Hole-Tone의 발생과 원형제트의 불안정 특성

Instability Characteristics of Circular Jets Producing Hole-Tones

  • 임정빈 (숭실대학교 대학원 기계공학과) ;
  • 권영필 (숭실대학교 공과대학 기계공학과)
  • 발행 : 1999.10.01
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초록

Generation of hole-tones and the instability of circular impinging jets are investigated based on the frequency characteristics and the radiated sound field. The experiment is carried out with varying hole sizes, jet speeds and impinging distances. It is found that hole-tones occur by both the low-speed laminar jet and the high-speed turbulent jet, but not by the transient jet, while plate-tones without holes are produced only in the high-speed turbulent impinging jet. When the diameter ratio of the hole to the nozzle is nearly one, hole-tones occur most easily. At low speed, it is found that hole-tones are due to the symmetrical unstable jet and the impinging distance decreases with jet speed. And the Strouhal number and the sound pressure level increase with jet speed. At high speed, hole-tones show the same characteristics as plate-tones. It is found that the ratio of the convection speed varies with the Strouhal number and the jet speed.

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참고문헌

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