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{Yang:2017:10.2514/1.J055854,
author = {Yang, D and Morgans, A},
doi = {10.2514/1.J055854},
journal = {AIAA Journal},
pages = {3120--3127},
title = {The acoustics of cooled Helmholtz resonators},
url = {http://dx.doi.org/10.2514/1.J055854},
volume = {55},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Helmholtz resonators (HRs) are commonly used to damp thermoacous-tic oscillations in aero-engine and gas turbine combustors.  In practice theHR is often maintained at a cooler temperature than the combustor, butthis  tends  to  be  neglected  when  modelling.   In  this  work,  we  derive  ananalytical model for both the acoustic damping and the effect on the com-bustor thermoacoustics of HRs whose volume is at a different temperatureto the combustor.  The energy conservation equation based on stagnationenthalpy, together with the mass and momentum conservation equations, isincorporated into a linear HR sound absorption model.  These are coupledwith linear wave-based models for the plane acoustic waves in the systemto which the HR is attached – here a combustor.  The temperature differ-ence is found to generate an entropy wave which advects downstream of theresonator (and may generate further acoustic waves if accelerated), and tochange the acoustic damping near the resonant frequency.  This model forthe HR acoustics is then incorporated into a low-order network model forcombustor thermoacoustics.  The importance of capturing the effect of theHR temperature difference on the overall thermoacoustic modes is clearlydemonstrated.
AU  - Yang,D
AU  - Morgans,A
DO  - 10.2514/1.J055854
EP  - 3127
PY  - 2017///
SN  - 1533-385X
SP  - 3120
TI  - The acoustics of cooled Helmholtz resonators
T2  - AIAA Journal
UR  - http://dx.doi.org/10.2514/1.J055854
UR  - http://hdl.handle.net/10044/1/45411
VL  - 55
ER  -
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