Imperial College London
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Professor Aimee S. Morgans

Faculty of Engineering, Department of Mechanical Engineering

Professor of Thermofluids
 
 
 
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Contact

 

+44 (0)20 7594 9975a.morgans

 
 
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Location

 

621City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Su:2022:10.1121/10.0009586,
author = {Su, J and Yang, D and Morgans, AS},
doi = {10.1121/10.0009586},
journal = {The Journal of the Acoustical Society of America},
pages = {1142--1157},
title = {Low-frequency acoustic radiation from a flanged circular pipe at an inclined angle},
url = {http://dx.doi.org/10.1121/10.0009586},
volume = {151},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The generic problem of low-frequency acoustic radiation through quiescent air from a circular pipe that is inclined with respect to its exit flange is studied in this work. The exit flange is taken to extend as an infinite plane away from the pipe opening. The analysis implements a hybrid method that combines modal expansions with the boundary element method. The reflection coefficient and pipe end correction for Helmholtz numbers (based on the pipe radius) less than 2.5 are calculated for various inclination angles up to 75°. Calculations are validated using simulations from the finite-element solver of the commercial software package COMSOL. The reflection coefficient and end correction predictions agree closely with the validation simulations yet differ notably from the results available in the literature. The solution obtained from the hybrid method is subsequently used to analyse the acoustic field at the pipe exit and in the downstream space. The key aspects of the governing physics pertaining to practical engineering applications at low frequencies are captured in a low-order approximation, which significantly reduces the degrees of freedom of the problem and provides generally good estimates of the reflection coefficient and end correction, as well as the downstream acoustic field.
AU  - Su,J
AU  - Yang,D
AU  - Morgans,AS
DO  - 10.1121/10.0009586
EP  - 1157
PY  - 2022///
SN  - 0001-4966
SP  - 1142
TI  - Low-frequency acoustic radiation from a flanged circular pipe at an inclined angle
T2  - The Journal of the Acoustical Society of America
UR  - http://dx.doi.org/10.1121/10.0009586
UR  - https://asa.scitation.org/doi/10.1121/10.0009586
UR  - http://hdl.handle.net/10044/1/95193
VL  - 151
ER  -
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