Imperial College London
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ProfessorAlexTaylor

Faculty of Engineering, Department of Mechanical Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 7042a.m.taylor

 
 
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Location

 

618City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Noh:2019:10.1016/j.proci.2018.07.090,
author = {Noh, D and Karlis, E and Navarro-Martinez, S and Hardalupas, Y and Taylor, AMKP and Fredrich, D and Jones, WP},
doi = {10.1016/j.proci.2018.07.090},
journal = {Proceedings of the Combustion Institute},
pages = {5333--5341},
title = {Azimuthally-driven subharmonic thermoacoustic instabilities in a swirl-stabilised combustor},
url = {http://dx.doi.org/10.1016/j.proci.2018.07.090},
volume = {37},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A joint experimental and computational study of thermoacoustic instabilities in a model swirl-stabilised combustor is presented. This paper aims to deliver a better characterisation of such instabilities through the examination of measurements in conjunction with the numerical results obtained via Large Eddy Simulation (LES). The experimental configuration features a cylindrical combustion chamber where the lean premixed methane/air flame experiences self-sustained thermoacoustic oscillations. The nonlinear behaviour of the acoustically excited flame is experimentally investigated by broadband chemiluminescence and dynamic pressure measurements. In LES, the Eulerian stochastic field method is employed for the unknown turbulence/chemistry interaction of the gas-phase. Comparisons of the predicted frequency spectrum and phase-resolved flame structure with measurements are found to be in good agreement, confirming the predictive capabilities of the LES methodology. The presence of Period 2 thermoacoustic oscillations, as a consequence of period-doubling bifurcation, is also confirmed in LES. Through the application of nonlinear analysis both to the experimental and numerical acoustic fluctuations, it is highlighted that the nonlinear behaviour of combustion instabilities in the burner under investigation follows a pattern typical of Period 2 oscillations. Furthermore, the current work demonstrates a useful approach, through the use of dynamic mode decomposition (DMD), for the investigation of unstable flame modes at a specific frequency of interest. The experimental and numerical DMD reconstructions suggest that hot combustion products are convected azimuthally at a rate dictated by the subharmonic frequency.
AU  - Noh,D
AU  - Karlis,E
AU  - Navarro-Martinez,S
AU  - Hardalupas,Y
AU  - Taylor,AMKP
AU  - Fredrich,D
AU  - Jones,WP
DO  - 10.1016/j.proci.2018.07.090
EP  - 5341
PY  - 2019///
SN  - 0082-0784
SP  - 5333
TI  - Azimuthally-driven subharmonic thermoacoustic instabilities in a swirl-stabilised combustor
T2  - Proceedings of the Combustion Institute
UR  - http://dx.doi.org/10.1016/j.proci.2018.07.090
UR  - https://www.sciencedirect.com/science/article/pii/S154074891830508X
UR  - http://hdl.handle.net/10044/1/63765
VL  - 37
ER  -
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