Flow and noise investigations of a separate flow exhaust system
(2005) ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future 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:
https://lup.lub.lu.se/record/615511
- author
- Mihaescu, Mihai LU ; Szász, Robert-Zoltán LU ; Fuchs, Laszlo LU and Gutmark, Ephraim
- organization
- publishing date
- 2005
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Jet noise, Coaxial jets, Cold air
- host publication
- 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
- conference location
- Reno-Tahoe, NV, United States
- conference dates
- 2005-06-06 - 2005-06-09
- external identifiers
-
- wos:000242493400113
- scopus:27744586602
- language
- English
- LU publication?
- yes
- id
- a47ca28a-3b01-4fa3-b397-69d65de492b1 (old id 615511)
- date added to LUP
- 2016-04-04 11:13:36
- date last changed
- 2022-01-29 21:31:04
@inproceedings{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}}, booktitle = {{Proceedings of the ASME Turbo Expo}}, keywords = {{Jet noise; Coaxial jets; Cold air}}, language = {{eng}}, pages = {{1221--1229}}, publisher = {{American Society Of Mechanical Engineers (ASME)}}, title = {{Flow and noise investigations of a separate flow exhaust system}}, volume = {{6 PART B}}, year = {{2005}}, }