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Computational aeroacoustics of a s eparate flow exhaust system with eccentric inner nozzle

Mihaescu, Mihai LU ; Gutmark, Ephraim; Szász, Robert-Zoltán LU ; Fuchs, Laszlo LU and Martens, S. (2007) 45th AIAA Aerospace Sciences Meeting and Exhibit In 45th AIAA Aerospace Science Meeting Proceedings
Abstract
A major issue related to our modern way of life is the noise caused by jet engine powered airliners. Methods to reduce the jet noise were proposed in the last decades starting with the introduction of high bypass turbofan engines. A numerical investigation of flow and acoustics of a separate flow exhaust system is performed in the present paper. The goal is to investigate how the noise generated by a separate flow jet engine exhaust is influenced if the symmetry of the jet exhaust geometry is broken by having the inner nozzle and the center body off the center line axis of the fan nozzle. A decomposition of flow variables is used that allows separation of flow and acoustic computations. Large Eddy Simulation approach is employed to compute... (More)
A major issue related to our modern way of life is the noise caused by jet engine powered airliners. Methods to reduce the jet noise were proposed in the last decades starting with the introduction of high bypass turbofan engines. A numerical investigation of flow and acoustics of a separate flow exhaust system is performed in the present paper. The goal is to investigate how the noise generated by a separate flow jet engine exhaust is influenced if the symmetry of the jet exhaust geometry is broken by having the inner nozzle and the center body off the center line axis of the fan nozzle. A decomposition of flow variables is used that allows separation of flow and acoustic computations. Large Eddy Simulation approach is employed to compute the flow field and the acoustic sources. The inhomogeneous wave equation is used to compute the acoustic near- and far-fields. Using this method, previous numerical studies of the symmetric (baseline) configuration showed good agreement between the computed data and the experimental results. Comparisons between the near- and far-field baseline concentric case and the computations obtained using the eccentric configuration are performed showing an acoustic benefit for the offset case. (Less)
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published
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in
45th AIAA Aerospace Science Meeting Proceedings
publisher
American Institute of Aeronautics and Astronautics
conference name
45th AIAA Aerospace Sciences Meeting and Exhibit
external identifiers
  • Other:AIAA 2007-13
language
English
LU publication?
yes
id
a13665a7-0807-4929-be6f-a902292f6722 (old id 571952)
date added to LUP
2008-02-25 11:18:55
date last changed
2016-04-16 09:28:32
@inproceedings{a13665a7-0807-4929-be6f-a902292f6722,
  abstract     = {A major issue related to our modern way of life is the noise caused by jet engine powered airliners. Methods to reduce the jet noise were proposed in the last decades starting with the introduction of high bypass turbofan engines. A numerical investigation of flow and acoustics of a separate flow exhaust system is performed in the present paper. The goal is to investigate how the noise generated by a separate flow jet engine exhaust is influenced if the symmetry of the jet exhaust geometry is broken by having the inner nozzle and the center body off the center line axis of the fan nozzle. A decomposition of flow variables is used that allows separation of flow and acoustic computations. Large Eddy Simulation approach is employed to compute the flow field and the acoustic sources. The inhomogeneous wave equation is used to compute the acoustic near- and far-fields. Using this method, previous numerical studies of the symmetric (baseline) configuration showed good agreement between the computed data and the experimental results. Comparisons between the near- and far-field baseline concentric case and the computations obtained using the eccentric configuration are performed showing an acoustic benefit for the offset case.},
  author       = {Mihaescu, Mihai and Gutmark, Ephraim and Szász, Robert-Zoltán and Fuchs, Laszlo and Martens, S.},
  booktitle    = {45th AIAA Aerospace Science Meeting Proceedings},
  language     = {eng},
  publisher    = {American Institute of Aeronautics and Astronautics},
  title        = {Computational aeroacoustics of a s eparate flow exhaust system with eccentric inner nozzle},
  year         = {2007},
}