A linear shock cell model for jets of arbitrary exit geometry

P. J. Morris, T. R.S. Bhat, G. Chen

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The shock cell structures of single supersonic non-ideally expanded jets with arbitrary exit geometry are studied. Both vortex sheets and realistic mean profiles are considered for the jet shear layer. The boundary element method is used to predict the shock spacing and screech tones in a vortex sheet model of a single jet. This formulation enables the calculations to be performed only on the vortex sheet. This permits the efficient and convenient study of complicated jet geometries. Results are given for circular, elliptic and rectangular jets and the results are compared with analysis and experiment. The agreement between the predictions and measurements is very good but depends on the assumptions made to predict the geometry of the fully expanded jet. A finite difference technique is used to examine the effect of finite mixing layer thickness for a single jet. The finite thickness of the mixing layer is found to decrease the shock spacing by approximately 20% over the length of the jet potential core.

Original languageEnglish (US)
Pages (from-to)199-211
Number of pages13
JournalJournal of Sound and Vibration
Volume132
Issue number2
DOIs
StatePublished - Jul 22 1989

All Science Journal Classification (ASJC) codes

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

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