Determining the pressure modes at high frequencies in lined ducts with a shear flow
Determining the pressure modes at high frequencies in lined ducts with a shear flow
Noise transmission problems where sound propagates in flow ducts occur in a variety of contexts. The work in this paper is motivated by the turbofan aircraft engine application. Simulating the acoustics of turbofan duct systems is a challenging problem because this can necessitate the modelling of high-frequency sound propagation in ducts containing sheared mean flow and with acoustically-lined walls. The purpose of this work is to develop fast and efficient simulation methods, that can be used to calculate the propagation of sound in lined flow ducts. In this paper, preliminary results are presented obtained from a new finite element code which has been developed specifically to determine the pressure modes in ducts containing shear flow. The formulation of the finite element method is outlined. Preliminary results are shown which compare the duct modes with different boundary layer profiles. These results provide examples of finite element solutions of pressure modes in an annular duct. The results show how the shape of the boundary-layer profile can affect the duct modes.
Olivieri, O.
ebe1ce34-3164-403b-8417-e2eb63f90821
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Astley, R.J.
cb7fed9f-a96a-4b58-8939-6db1010f9893
7 June 2010
Olivieri, O.
ebe1ce34-3164-403b-8417-e2eb63f90821
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Astley, R.J.
cb7fed9f-a96a-4b58-8939-6db1010f9893
Olivieri, O., McAlpine, A. and Astley, R.J.
(2010)
Determining the pressure modes at high frequencies in lined ducts with a shear flow.
16th AIAA/CEAS Aeroacoustics Conference, , Stockholm, Sweden.
07 - 09 Jun 2010.
13 pp
.
(doi:10.2514/6.2010-3944).
Record type:
Conference or Workshop Item
(Paper)
Abstract
Noise transmission problems where sound propagates in flow ducts occur in a variety of contexts. The work in this paper is motivated by the turbofan aircraft engine application. Simulating the acoustics of turbofan duct systems is a challenging problem because this can necessitate the modelling of high-frequency sound propagation in ducts containing sheared mean flow and with acoustically-lined walls. The purpose of this work is to develop fast and efficient simulation methods, that can be used to calculate the propagation of sound in lined flow ducts. In this paper, preliminary results are presented obtained from a new finite element code which has been developed specifically to determine the pressure modes in ducts containing shear flow. The formulation of the finite element method is outlined. Preliminary results are shown which compare the duct modes with different boundary layer profiles. These results provide examples of finite element solutions of pressure modes in an annular duct. The results show how the shape of the boundary-layer profile can affect the duct modes.
Text
Olivieri_2010.pdf
- Accepted Manuscript
Available under License Other.
More information
Published date: 7 June 2010
Additional Information:
Paper number AIAA-2010-3944
Venue - Dates:
16th AIAA/CEAS Aeroacoustics Conference, , Stockholm, Sweden, 2010-06-07 - 2010-06-09
Identifiers
Local EPrints ID: 192123
URI: http://eprints.soton.ac.uk/id/eprint/192123
PURE UUID: cc37611f-54dd-4bc8-a470-dfb79c70d041
Catalogue record
Date deposited: 29 Jun 2011 15:54
Last modified: 15 Mar 2024 03:00
Export record
Altmetrics
Contributors
Author:
O. Olivieri
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
