Characteristics of heat release rate spectra in turbulent flames with different fuels
Characteristics of heat release rate spectra in turbulent flames with different fuels
Direct combustion noise arises from pressure fluctuations caused by the unsteady heat release rate (HRR) and its spectral content is influenced by the spectral behaviour of HRR, which is investigated in this study. The unsteady HRR is either directly obtained from large eddy simulations (LES) or approximated using OH* chemiluminescence measurements for various flames in three configurations: a lean direct injection hydrogen combustor, a single-injector hydrocarbon-spray burner with swirling air, and a jet-in-cross-flow hydrogen burner. The volume-integrated HRR spectra exhibit a high-frequency scaling of f-5 in all the cases except for the jet-in-cross-flow flames. These results are explained using the spectral characteristics of local HRR and its correlation volume. Furthermore, the validity of a model for volume-integrated HRR spectra based on non-reacting flow turbulent kinetic energy spectra is evaluated.
Kumar, Ankit
42124273-6d64-4807-9070-6fe7a9a2ec56
Rajendram Soundararajan, Preethi
27962fcb-d8a8-405a-b137-086815ec8e29
Li, Caleb J.
61fbe90e-f24b-4cd5-b5b7-31ff17d8b35c
Massey, James C.
45425dba-9b74-466c-9518-8b48baa87de6
Swaminathan, Nedunchezhian
a67ab8a9-2d21-4cb3-b54b-429c3ed1360e
1 July 2026
Kumar, Ankit
42124273-6d64-4807-9070-6fe7a9a2ec56
Rajendram Soundararajan, Preethi
27962fcb-d8a8-405a-b137-086815ec8e29
Li, Caleb J.
61fbe90e-f24b-4cd5-b5b7-31ff17d8b35c
Massey, James C.
45425dba-9b74-466c-9518-8b48baa87de6
Swaminathan, Nedunchezhian
a67ab8a9-2d21-4cb3-b54b-429c3ed1360e
Kumar, Ankit, Rajendram Soundararajan, Preethi, Li, Caleb J., Massey, James C. and Swaminathan, Nedunchezhian
(2026)
Characteristics of heat release rate spectra in turbulent flames with different fuels.
Fuel, 415, [138409].
(doi:10.1016/j.fuel.2026.138409).
Abstract
Direct combustion noise arises from pressure fluctuations caused by the unsteady heat release rate (HRR) and its spectral content is influenced by the spectral behaviour of HRR, which is investigated in this study. The unsteady HRR is either directly obtained from large eddy simulations (LES) or approximated using OH* chemiluminescence measurements for various flames in three configurations: a lean direct injection hydrogen combustor, a single-injector hydrocarbon-spray burner with swirling air, and a jet-in-cross-flow hydrogen burner. The volume-integrated HRR spectra exhibit a high-frequency scaling of f-5 in all the cases except for the jet-in-cross-flow flames. These results are explained using the spectral characteristics of local HRR and its correlation volume. Furthermore, the validity of a model for volume-integrated HRR spectra based on non-reacting flow turbulent kinetic energy spectra is evaluated.
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Accepted/In Press date: 13 January 2026
e-pub ahead of print date: 23 January 2026
Published date: 1 July 2026
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Local EPrints ID: 509852
URI: http://eprints.soton.ac.uk/id/eprint/509852
ISSN: 0016-2361
PURE UUID: 43cc9bfa-525f-4b39-8933-d3b9b8367239
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Date deposited: 09 Mar 2026 17:31
Last modified: 10 Mar 2026 03:12
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Author:
Ankit Kumar
Author:
Preethi Rajendram Soundararajan
Author:
Caleb J. Li
Author:
James C. Massey
Author:
Nedunchezhian Swaminathan
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