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

doi:10.2514/1.34041

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 journal › Article › peer-review

23 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 language	English (US)
Pages (from-to)	54-59
Number of pages	6
Journal	AIAA journal
Volume	47
Issue number	1
DOIs	https://doi.org/10.2514/1.34041
State	Published - Jan 2009

ASJC Scopus subject areas

Aerospace Engineering

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10.2514/1.34041

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title = "Cross-spectral analysis of the pressure in a mach 0.85 Turbulent jet",

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.",

author = "Hall, {Joseph W.} and Hall, {Andr{\'e} M.} and Pinier, {Jeremy T.} and Glauser, {Mark N.}",

note = "Funding Information: The authors would like to acknowledge the funding of the U.S. Air Force Office of Scientific Research (John Schmisseur, Program Manager). Joseph W. Hall is grateful for the support of the Natural Sciences and Engineering Research Council of Canada. Andr{\'e} M. Hall would like to acknowledge the funding of Central New York– Puerto-Rico National Science Foundation Alliances for Graduate Education and the Professoriate (Roosevelt Johnson, Program Manager).",

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N1 - Funding Information: The authors would like to acknowledge the funding of the U.S. Air Force Office of Scientific Research (John Schmisseur, Program Manager). Joseph W. Hall is grateful for the support of the Natural Sciences and Engineering Research Council of Canada. André M. Hall would like to acknowledge the funding of Central New York– Puerto-Rico National Science Foundation Alliances for Graduate Education and the Professoriate (Roosevelt Johnson, Program Manager).

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N2 - 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.

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

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