Cross-spectral analysis of the pressure in a mach 0.85 Turbulent jet

Joseph W. Hall, André M. Hall, Jeremy T. Pinier, Mark N. Glauser

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Measurements of the near-field pressure in an unheated Mach 0.85 round jet were performed simultaneously with far-field acoustic pressure measurements at Syracuse University's Sky top Anechoic Chamber facility to directly quantify the strength and frequency content of the propagating portion of the jet's near-field pressure. The largest contributions were determined to be at the lower wave numbers commonly associated with hydrodynamic pressure fluctuations. This indicates that large low-frequency hydrodynamic fluctuations are obscuring a significant source of acoustic fluctuations in the jet and dictates that care must be taken when using single point measurements of nearfield pressure spectral decay to differentiate between acoustic (propagating) and hydrodynamic (nonpropagating) fluctuations.

Original languageEnglish (US)
Pages (from-to)54-59
Number of pages6
JournalAIAA journal
Volume47
Issue number1
DOIs
StatePublished - Jan 1 2009

ASJC Scopus subject areas

  • Aerospace Engineering

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