Jet noise: sound generation by disc and cylinder sources

Michael J Carley, P. A. Martin

Research output: Contribution to journalArticle

1 Citation (Scopus)
38 Downloads (Pure)

Abstract

An exact analysis of the field radiated by tonal and random non-axisymmetric sources distributed over a disc or cylinder is presented. The analysis is exact, without recourse to near- or far-field approximations, and leads to a direct relationship between source frequency and the nature of the radiated field. The implications of the analysis for a number of applications are discussed, finding in particular that source identification is inherently ill-conditioned as a result of a ‘filtering’ effect that removes information from the radiation field; low-frequency sources generate fields that are indistinguishable from each other; jet noise fields are inherently simpler than the flow that gives rise to them, a finding that has previously been noted for experimental data.
Original languageEnglish
Pages (from-to)3947-3964
Number of pages18
JournalProceedings of the Royal Society of London Series A - Mathematical Physical and Engineering Sciences
Volume468
Issue number2148
Early online date11 Sep 2012
DOIs
Publication statusPublished - 8 Dec 2012

Keywords

  • aeroacoustics
  • acoustics
  • radiation
  • inverse problems
  • jet noise

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