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Flow and noise investigations of a separate flow exhaust system

Mihaescu, Mihai LU ; Szász, Robert-Zoltán LU ; Fuchs, Laszlo LU and Gutmark, Ephraim (2005) ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future In Proceedings of the ASME Turbo Expo 6 PART B. p.1221-1229
Abstract
A major component of aircraft noise is the jet noise created by the high velocity hot stream exhausting from a jet engine, interacting with itself and with the surrounding cold air. In the present paper the flow and acoustic fields that are generated by two coaxial jets are considered. Numerically, the problem is divided into a flow related part (Navier-Stokes system of equation) and an acoustic part (an inhomogeneous wave equation). The flow field is handled by well resolved Large Eddy Simulation (LES). The acoustical sources can then be computed from the flow field calculations, on the near-field "source" grid. The acoustic field is solved, on the same or even on a larger separate grid, by using an acoustic approximation with appropriate... (More)
A major component of aircraft noise is the jet noise created by the high velocity hot stream exhausting from a jet engine, interacting with itself and with the surrounding cold air. In the present paper the flow and acoustic fields that are generated by two coaxial jets are considered. Numerically, the problem is divided into a flow related part (Navier-Stokes system of equation) and an acoustic part (an inhomogeneous wave equation). The flow field is handled by well resolved Large Eddy Simulation (LES). The acoustical sources can then be computed from the flow field calculations, on the near-field "source" grid. The acoustic field is solved, on the same or even on a larger separate grid, by using an acoustic approximation with appropriate acoustic boundary conditions. The computed flow and acoustical fields are compared to those measured on the separate flow nozzle test facility. The comparisons in terms of velocity and sound pressure levels are shown to validate the used approach. Frequency spectra of the acoustic density fluctuation are presented in order to indicate the locations where the high- or low- frequency noise dominates. The numerical study is focused as well on the Reynolds number effects on the flow and acoustics. Copyright (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Jet noise, Coaxial jets, Cold air
in
Proceedings of the ASME Turbo Expo
volume
6 PART B
pages
1221 - 1229
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future
external identifiers
  • WOS:000242493400113
  • Scopus:27744586602
language
English
LU publication?
yes
id
a47ca28a-3b01-4fa3-b397-69d65de492b1 (old id 615511)
date added to LUP
2007-11-25 15:25:40
date last changed
2016-10-13 04:44:36
@misc{a47ca28a-3b01-4fa3-b397-69d65de492b1,
  abstract     = {A major component of aircraft noise is the jet noise created by the high velocity hot stream exhausting from a jet engine, interacting with itself and with the surrounding cold air. In the present paper the flow and acoustic fields that are generated by two coaxial jets are considered. Numerically, the problem is divided into a flow related part (Navier-Stokes system of equation) and an acoustic part (an inhomogeneous wave equation). The flow field is handled by well resolved Large Eddy Simulation (LES). The acoustical sources can then be computed from the flow field calculations, on the near-field "source" grid. The acoustic field is solved, on the same or even on a larger separate grid, by using an acoustic approximation with appropriate acoustic boundary conditions. The computed flow and acoustical fields are compared to those measured on the separate flow nozzle test facility. The comparisons in terms of velocity and sound pressure levels are shown to validate the used approach. Frequency spectra of the acoustic density fluctuation are presented in order to indicate the locations where the high- or low- frequency noise dominates. The numerical study is focused as well on the Reynolds number effects on the flow and acoustics. Copyright},
  author       = {Mihaescu, Mihai and Szász, Robert-Zoltán and Fuchs, Laszlo and Gutmark, Ephraim},
  keyword      = {Jet noise,Coaxial jets,Cold air},
  language     = {eng},
  pages        = {1221--1229},
  publisher    = {ARRAY(0x9219fc8)},
  series       = {Proceedings of the ASME Turbo Expo},
  title        = {Flow and noise investigations of a separate flow exhaust system},
  volume       = {6 PART B},
  year         = {2005},
}