Flow characteristics of the large scale wave-like structure of a supersonic round jet

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A model is developed for the large scale coherent structure of subsonic and supersonic axisymmetric jets. A fluctuation in the jet flow is regarded as being separable into a time-averaged component, a periodic wave-like component and a random small scale component. The small scale fluctuation is viewed as both the driving and dissipative mechanism for the wave-like component. An energy balance model is developed which examines thinterchange of energy between the mean flow and the large scale motion. The effect of wave-like fluctuation amplitude on its own and the mean flow development is examined. Calculations of contours of equal pressure level in the jet near field are made. A model for the mechanism by which locally subsonic components of the wave-like structure may radiate noise to the far field is examined. The method for calculating the radiated noise is discussed.

Original languageEnglish (US)
Pages (from-to)223-244
Number of pages22
JournalJournal of Sound and Vibration
Issue number2
Publication statusPublished - Jul 22 1977


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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