Jet noise prediction using different turbulent scales

Rod H. Self, Mahdi Azarpeyvand

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)

Abstract

The turbulent energy dissipation rate time-scale and length-scale has been routinely used for the prediction of noise from turbulent flows, particularly jet streams. However, this is not the only possible choice. In general, scales evolving in a turbulent medium are threefold. First, those associated with the mean flow; second, those attributed to the turbulence and the mean flow interactions; and third, scales related to the turbulence-turbulence interactions. In this paper, special attention will be paid to further study of the underlying physics of aerodynamic noise by examining various time-scales. To do so, three time scales, namely, dissipation, production, and strain rate time scales, are defined and used in the source modelling to emphasis the effect of the turbulence structures at different jet regions on the jet noise production mechanism. The required mean value and turbulence parameters are obtained using a modified k - turbulence model, and Lighthill's Acoustic Analogy is used for the prediction of the emanated noise.

Original languageEnglish
Pages (from-to)433-440
Number of pages8
JournalAcoustical Physics
Volume55
Issue number3
DOIs
Publication statusPublished - 1 May 2009

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