NDLI: Analysis of noise produced by an orderly structure of turbulent jets

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Analysis of noise produced by an orderly structure of turbulent jets

Content Provider	NASA Technical Reports Server (NTRS)
Author	Hardin, J. C.
Copyright Year	1973
Description	The orderly structure which has been observed recently by numerous researchers within the transition region of subsonic turbulent jets is analyzed to reveal its noise-producing potential. For a circular jet, this structure is molded as a train of toroidal vortex rings which are formed near the jet exit and propagate downstream. The noise produced by the model is evaluated from a reformulation of Lighthill's expression for the far-field acoustic density, which emphasizes the importance of the vorticity within the turbulent flow field. It is shown that the noise production occurs mainly close to the jet exit and depends primarily upon temporal changes in the toroidal radii. The analysis suggests that the process of formation of this regular structure may also be an important contribution of the high-frequency jet noise. These results may be helpful in the understanding of jet-noise generation and in new approaches to jet-noise suppression.
File Size	1272583
Page Count	32
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730012846
Archival Resource Key	ark:/13960/t3c00z971
Language	English
Publisher Date	1973-04-01
Access Restriction	Open
Subject Keyword	Numerical Analysis Turbulent Flow Acoustic Measurement Acoustic Properties Jet Flow Vortices Flow Distribution Aerodynamic Noise Research Projects Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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