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A 3-D modal stochastic jet noise source model

Ewert, Roland and Neifeld , Andrej (2011) A 3-D modal stochastic jet noise source model. 17th AIAA/CEAS Aeroacoustics Conference, 5.-8. Juni 2011, Portland, Oregon, USA.

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Abstract

In previous work the jet mixing noise model of Tam & Auriault was realized as a time marching method in 2-D using a stochastic sound source, generated by means of the RPM (Random Particle Mesh) method. The generated stochastic sound sources closely realize the two-point cross-correlation function proposed by Tam & Auriault to describe the statistics of a ne-scale jet mixing noise source. In a rst attempt to extend the prediction capability to 3-D, a simplied radial scaling function was introduced to use the 2-D sound sources for axisymmetric computations of azimuthal mode order m=0. In the current work a strictly derived 3-D stochastic noise source is introduced, based on an azimuthal mode decomposition. For azimuthal mode order m=0 clear dierences to the previously used simplified scaling model are obtained for sources with small relative distance to the jet axis. The azimuthally decomposed 3-D stochastic noise sources are shown to be generated by mutually uncorrelated 2-D stochastic sources for each mode order. Since for jet noise only the firrst few azimuthal modes are essential to describe the acoustic far-field radiation, a highly ecient 3-D broadband jet noise model for jet mixing noise is obtained at the computational price of a 2-D computation. For a 2-D simulation the capability of RPM to properly prescribe sound spectra is veried with an analytical solution. Sample results that highlight the proper functioning of the 3-D modal source model are presented.

Item URL in elib:https://elib.dlr.de/73621/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:A 3-D modal stochastic jet noise source model
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Neifeld , AndrejUNSPECIFIEDUNSPECIFIED
Date:June 2011
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:CAA, Jet Noise, 3-D modal, Axisymmetric, RPM, Random Particle Method, Tam and Auriault, Jet Mixing Noise
Event Title:17th AIAA/CEAS Aeroacoustics Conference
Event Location:Portland, Oregon, USA
Event Type:international Conference
Event Dates:5.-8. Juni 2011
Organizer:AIAA / CEAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Ewert, Dr.-Ing. Roland
Deposited On:04 Dec 2012 14:55
Last Modified:04 Dec 2012 14:55

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