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Experimental evidence of turbulent source coherence effecting jet noise

Fuchs, Helmut V. and Michel, Ulf (1977) Experimental evidence of turbulent source coherence effecting jet noise. American Institute of Aeronautics and Astronautics. 4th Aeroacoustics Conference, 1977-10-03 - 1977-10-05, Atlanta, GA (USA).

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Official URL: http://www.aiaa.org


Previous experimental investigations into the turbulence structure in model-scale, cold air jets have led to a new model of large-scale, coherent (i.e. acoustically non-compact) sources generating jet mixing noise. More recent coherence measuremnts in the near field of a real jet engine and in the far field of cold and hot jets lend further support to the belief that jet noise at small angles to the jet axis is strongly effected by coherent sources in the jet mixing region. This has several consequences regarding the relevant parameters in scaling laws for jet noise and sheds new light on the "cone of silence" and "convective amplitifcation" issues, both effects having been derived from a model of acoustic point sources ("eddies") convected with the sheared flow.

Item URL in elib:https://elib.dlr.de/22188/
Document Type:Conference or Workshop Item (Paper)
Title:Experimental evidence of turbulent source coherence effecting jet noise
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:3 October 1977
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Publisher:American Institute of Aeronautics and Astronautics
Series Name:AIAA Paper 77-1348
Keywords:jet noise, coherent structures, source coherence, coherent sources, cone of silence
Event Title:4th Aeroacoustics Conference
Event Location:Atlanta, GA (USA)
Event Type:international Conference
Event Start Date:3 October 1977
Event End Date:5 October 1977
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Köln-Porz , Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic > Turbulence Research
Deposited By: Michel, Prof. Dr.-Ing. Ulf
Deposited On:14 Aug 2006
Last Modified:24 Apr 2024 19:03

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