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A 3-D odal stochastic jet noise source model

Ewert, R. and Neifeld , A. and Wohlbrandt, A. (2011) A 3-D odal stochastic jet noise source model. In: Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference). AIAA. 17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), 05.06. - 08.06.2011, Portland, 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 M esh) method. The generated stochastic sound sources closely realize the two-point cross-correlation function proposed by Tam & Auriault to describe the statistics of a fine-scale jet mixing noise source. In a first attempt to extend the prediction capability to 3-D, a simplified 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 differences 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 first few azimuthal modes are essential to describe the acoustic far-field radiation, a highly efficient 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 verified with an analytical solution. Sample results that highlight the proper functioning of the 3-D modal source model are presented.

Document Type:Conference or Workshop Item (Paper)
Title:A 3-D odal stochastic jet noise source model
Authors:
AuthorsInstitution or Email of Authors
Ewert, R.UNSPECIFIED
Neifeld , A.UNSPECIFIED
Wohlbrandt, A.UNSPECIFIED
Date:2011
Journal or Publication Title:Proceedings 17th AIAA / CEAS Aeroacoustics Conference (32nd Aeroacoustics Conference)
Refereed publication:Yes
In ISI Web of Science:No
Publisher:AIAA
Status:Published
Keywords:Stochastic sound source modelling, acoustic, noise, broadband, jet noise
Event Title:17th AIAA / CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)
Event Location:Portland, USA
Event Type:international Conference
Event Dates:05.06. - 08.06.2011
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Berlin-Adlershof , Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Balbir Kaur
Deposited On:20 Jan 2012 15:00
Last Modified:09 Feb 2012 15:18

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