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Analysis of simultaneous measurement of acoustic pressure in the far-field and density gradient in the near field in a cold jet

Miguel, Elena and Henning, Arne (2013) Analysis of simultaneous measurement of acoustic pressure in the far-field and density gradient in the near field in a cold jet. American Institute of Aeronautics and Astronautics. 19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference), 27. - 29. May 2013, Berlin, Germany.

Full text not available from this repository.

Official URL: http://arc.aiaa.org | DOI: 10.2514/6.2013-2034

Abstract

The purpose of the investigation presented here is to study the degree of correlation between the density gradient in the near eld and the aeroacoustic sound generation in the far field of a cold jet. The variations of the density gradient in the flow are visualized and recorded by the Background Oriented Schlieren (BOS) technique. In this method high power LEDs are used as illumination source. Simultaneously the pressure fluctuations in the acoustic far-field are recorded by a set of microphones. Measurements on a round nozzle and a chevron nozzle are conducted and the obtained results are compared. Large structures emitting noise are localized, being in the case of the chevron nozzle further upstream due to the higher level of entrainment of the jet with the surrounded ambient fluid. In addition, it is demonstrated that the noise produced by these structures is radiated mainly downstream, having the highest correlations with the pressure fluctuations recorded with the microphone located at an angle Theta = 26°respect to the jet-axis.

Item URL in elib:https://elib.dlr.de/82507/
Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:DOI: 10.2514/6.2013-2034
Title:Analysis of simultaneous measurement of acoustic pressure in the far-field and density gradient in the near field in a cold jet
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Miguel, ElenaUNSPECIFIEDUNSPECIFIED
Henning, ArneUNSPECIFIEDUNSPECIFIED
Date:2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-15
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Status:Published
Keywords:acoustic pressure, far-field, BOS, cross-correlation
Event Title:19th AIAA/CEAS Aeroacoustics Conference (34th AIAA Aeroacoustics Conference)
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:27. - 29. May 2013
Organizer:The American Institute of Aeronautics and Astronautics (AIAA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:22 Aug 2013 13:35
Last Modified:22 Aug 2013 13:35

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