대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제24권2호
  • /
  • Pages.280-287
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  • 2000
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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후향계단 주위의 난류 박리재부착유동에서의 벽압력변동의 통계적 특징

Cross-Spectral Characteristics of Wall Pressure Fluctuations in Flows over a Backward-Facing Step

  • 이인원 (한국과학기술원 기계공학과) ;
  • 성형진 (한국과학기술원 기계공학과)
  • 발행 : 2000.02.01
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초록

Laboratory measurements were made of wall pressure fluctuations in a separated and reattaching flow over a backward-facing step. An array of 32 microphones along the streamwise direction was utilized. Various statistical properties of pressure fluctuations were scrutinized. The main emphasis was placed on the flow inhomogeneity along the streamwise direction. One point statistics such as the streamwise distribution of rms pressure and autospectra were shown to be generally consistent with other studies. The coherences and wavenumber spectra in the streamwise directions were indicative of the presence of dual modes in pressure; one is the large-scale vortical structure in low frequency and the other is the boundary-layer-like decaying mode in high frequency.

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참고문헌

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