Turbulent flow induced self-sustained oscillations in supersonic cavity flows

Weipeng Li, Taku Nonomura, Kozo Fujii

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The characteristics of self-sustained oscillations are investigated with high-resolution implicit large-eddy simulations of supersonic turbulent flow (M∞=2.0) past a three-dimensional rectangular cavity with length-to-depth ratio of 2. First, the mechanism driving the self-sustained oscillations is verified to be a feedback-loop mechanism between the shear-layer instability and acoustics disturbances. The noise source in located near the trailing edge, and the generation of feedback compression waves is mainly related to the passage of vortices over the trailing edge. Second, the effects of the upstream boundary-layer thickness are analyzed. The upstream boundary-layer thickness has significant impacts on the features of noise radiation. As the upstream boundary-layer becomes thicker, the dominant mode of cavity tones is varied to a lower frequency, and a 8 dB decrease in sound pressure level is observed in the broadband noise radiation.

Original languageEnglish
Title of host publication40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011
Pages442-447
Number of pages6
Publication statusPublished - 2011 Dec 1
Externally publishedYes
Event40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 - Osaka, Japan
Duration: 2011 Sep 42011 Sep 7

Publication series

Name40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011
Volume1

Other

Other40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011
CountryJapan
CityOsaka
Period11/9/411/9/7

Keywords

  • Feedback-loop mechanism
  • Self-sustained oscillations
  • Supersonic cavity flow
  • Upstream boundary-layer thickness

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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