Modelling of sound-vortex interaction for the flow through an annular aperture
File(s)
Published version
Author(s)
Su, Jialin
Yang, Dong
Morgans, Aimee S
Type
Journal Article
Abstract
The acoustic characteristics of bluff-body burners play a critical role in the combustion stability for combustors using this type of burners. The acoustic modelling of an axisymmetric bluff-body burner entails properly capturing the sound-vortex interaction for the flow through the annular aperture of the burner. Such a problem pertaining to annular apertures can also be of relevance to other engineering applications, such as acoustic dampers or turbofan duct systems. The methodology of combining suitable acoustic Green’s functions with a vortex sheet model has been applied extensively in previous theoretical studies of the acoustic response of a short circular orifice with a mean flow passing through it. In this work, the Green’s function and vortex sheet model theory is generalised in order to efficiently predict the acoustic characteristics of thin annular apertures sustaining a mean flow, which effectively emulate the typical axisymmetric bluff-body burner configurations in realistic combustors. This requires the incorporation of multiple Kutta conditions for modelling the vortex shedding and multiple vortex sheets for modelling the interaction of the shed vorticity and the acoustics. A high-resolution compressible Large Eddy Simulation (LES) of a simplified representative geometry is performed for validation; the analytical prediction and numerical findings show very good agreement, and the LES further provides key insights into the speed with which vortical disturbances convect downstream.
Date Issued
2021-09
Date Acceptance
2021-05-27
Citation
Journal of Sound and Vibration, 2021, 509, pp.1-25
ISSN
0022-460X
Publisher
Elsevier BV
Start Page
1
End Page
25
Journal / Book Title
Journal of Sound and Vibration
Volume
509
Copyright Statement
© 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
(http://creativecommons.org/licenses/by-nc-nd/4.0/).
Sponsor
Commission of the European Communities
Identifier
https://www.sciencedirect.com/science/article/pii/S0022460X21003229?via%3Dihub
Grant Number
772080
Subjects
02 Physical Sciences
09 Engineering
Acoustics
Publication Status
Published
Article Number
116250
Date Publish Online
2021-06-07