| Issue |
Acta Acust.
Volume 7, 2023
|
|
|---|---|---|
| Article Number | 19 | |
| Number of page(s) | 13 | |
| Section | Aeroacoustics | |
| DOI | https://doi.org/10.1051/aacus/2023011 | |
| Published online | 24 May 2023 | |
Technical & Applied Article
Radiation of higher order modes from circular ducts with flow
Univ Lyon, Ecole Centrale de Lyon, CNRS, Univ Claude Bernard Lyon 1, INSA Lyon, LMFA, UMR5509, 69130 Ecully, France
* Corresponding author: courford@gmail.com, courtney.ford@ec-lyon.fr
Received:
1
July
2022
Accepted:
4
April
2023
This work aims to predict the transfer function of a given modal content inside a circular duct with a bellmouth inlet in the presence of a mean flow. The transfer function is the relation in amplitude and phase between a given mode inside the duct and an observer located in the far-field. The numerical solution is obtained by finite element simulation in which the mean flow is input data. Verification is provided by comparison to the analytical solution of an unbaffled circular duct with uniform flow. Influence from various parameters such as the geometry and mean Mach number on the radiated pressure field is investigated. The analytical solution is a good approximation for finding the radiated principal lobe, and the inlet geometry is found to be more important than other parameters such as mean flow when static inlet configuration is studied.
Key words: Modal radiation / Unflanged circular duct / Static inlet configuration / Transfer function
© The Author(s), published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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