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Statistical estimation of aeroacoustic source terms in cold subsonic turbulent jets using Multiplane Stereo PIV and BOS

Krebs, Ingo and Schröder, Andreas and Henning, Arne and Agocs, Janos (2011) Statistical estimation of aeroacoustic source terms in cold subsonic turbulent jets using Multiplane Stereo PIV and BOS. 11th ONERA-DLR Aerospace Symposium, ODAS 2011, 09. Feb. - 11. Feb. 2011, Toulouse, France.

Full text not available from this repository.

Official URL: http://www.onera.fr/ODAS2011/index.htm

Abstract

The dataset of Multiplane Stereo Particle Image Velocimetry (MSPIV) measurements on a cold subsonic jet at Mach number M ≈ 0.65 is analysed in order to obtain information of the turbulent flow with relevance for noise prediction methods. After Reynolds-decomposition the two-point space-time correlations of the axial fluctuating velocity components are calculated. Thus, it is possible to determine the turbulent kinetic energy k, the axial integral length-scale L , the decorrelation time-scale t and the convection velocity u of the axial velocity correlations. In a second experiment the sound generation in a cold jet at Mach number M ≈ 0.9 has been investigated by means of simultaneous and synchronized Background Oriented Schlieren (BOS) measurements in the near-field and microphone measurements in the far-field. From 20000 recorded BOS snapshots in the region of the potential core the density gradient fields are determined and cross-correlated with the acoustic far-field pressure signal. The correlation maps show regularities in the flow field which are related to the radiated noise.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Statistical estimation of aeroacoustic source terms in cold subsonic turbulent jets using Multiplane Stereo PIV and BOS
Authors:
AuthorsInstitution or Email of Authors
Krebs, IngoUNSPECIFIED
Schröder, AndreasUNSPECIFIED
Henning, ArneTU-Berlin
Agocs, JanosUNSPECIFIED
Date:2011
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:Background Oriented Schlieren (BOS), space-time-correlations, Stereo Particle Image Velocimetry, aeroacoustic, turbulent jets
Event Title:11th ONERA-DLR Aerospace Symposium, ODAS 2011
Event Location:Toulouse, France
Event Type:international Conference
Event Dates:09. Feb. - 11. Feb. 2011
Organizer:DLR/ONERA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Concepts & Integration
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:07 Mar 2011 11:26
Last Modified:07 Mar 2011 11:26

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