Large Eddy Simulation of Thermo-Acoustic Instabilities in Bluff-Body Stabilized Flames; A Comparison Between Jet-A and C1
(2026) AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026 In AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026- Abstract
Due to the threat climate change poses, the aviation industry needs to adapt. In the process to convert the aviation fleet into a more environmentally friendly fleet, using biofuels such as Sustainable Aviation Fuels as a drop-in fuel remains a promising option. To include biofuels, safety aspects need to be investigated, where combustion instabilities are important. Thermo-acoustic instabilities are widely regarded as one of the most important combustion instabilities in combustors. Here, Jet-A and C1 are numerically compared using Large Eddy Simulations with Finite-Rate Chemistry and pathway-centric skeletal reaction mechanisms Z79 and Z153. The simulations capture the thermo-acoustic instability well with good agreement with... (More)
Due to the threat climate change poses, the aviation industry needs to adapt. In the process to convert the aviation fleet into a more environmentally friendly fleet, using biofuels such as Sustainable Aviation Fuels as a drop-in fuel remains a promising option. To include biofuels, safety aspects need to be investigated, where combustion instabilities are important. Thermo-acoustic instabilities are widely regarded as one of the most important combustion instabilities in combustors. Here, Jet-A and C1 are numerically compared using Large Eddy Simulations with Finite-Rate Chemistry and pathway-centric skeletal reaction mechanisms Z79 and Z153. The simulations capture the thermo-acoustic instability well with good agreement with experimental results. Z153 provides a better limit-cycle behavior for C1, whilst Z79 provides an accurate transition point for thermo-acoustics. Z153 might yet accurately capture the transition point, however, the simulations required to validate this is left for future work. Gas dilatation images provide information regarding its proximity to the recirculation zone. Once thermo-acoustic instabilities are present, the gas dilatation is present in the recirculation zone. To obtain thermo-acoustics, the f1L needs to couple with fHD, which occurs either when the frequency detuning is small, or if the amplitude of the acoustics is large enough. Z153 provided a better propagation speed of the flame such that the detuning decreased through an increased effective speed of sound, and therefore the coupling strengthened resulting in a larger amplitude, as seen in the experiments.
(Less)
- author
- Jarfors, B. LU and Fureby, C. LU
- organization
- publishing date
- 2026
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026
- series title
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026
- publisher
- American Institute of Aeronautics and Astronautics
- conference name
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026
- conference location
- Orlando, United States
- conference dates
- 2026-01-12 - 2026-01-16
- external identifiers
-
- scopus:105031184252
- ISBN
- 9781624107658
- DOI
- 10.2514/6.2026-2408
- language
- English
- LU publication?
- yes
- id
- 11fbc1f0-925c-4bec-a3bc-e45ed32e7e96
- date added to LUP
- 2026-03-26 11:14:13
- date last changed
- 2026-03-26 11:14:32
@inproceedings{11fbc1f0-925c-4bec-a3bc-e45ed32e7e96,
abstract = {{<p>Due to the threat climate change poses, the aviation industry needs to adapt. In the process to convert the aviation fleet into a more environmentally friendly fleet, using biofuels such as Sustainable Aviation Fuels as a drop-in fuel remains a promising option. To include biofuels, safety aspects need to be investigated, where combustion instabilities are important. Thermo-acoustic instabilities are widely regarded as one of the most important combustion instabilities in combustors. Here, Jet-A and C1 are numerically compared using Large Eddy Simulations with Finite-Rate Chemistry and pathway-centric skeletal reaction mechanisms Z79 and Z153. The simulations capture the thermo-acoustic instability well with good agreement with experimental results. Z153 provides a better limit-cycle behavior for C1, whilst Z79 provides an accurate transition point for thermo-acoustics. Z153 might yet accurately capture the transition point, however, the simulations required to validate this is left for future work. Gas dilatation images provide information regarding its proximity to the recirculation zone. Once thermo-acoustic instabilities are present, the gas dilatation is present in the recirculation zone. To obtain thermo-acoustics, the f<sub>1L</sub> needs to couple with f<sub>HD</sub>, which occurs either when the frequency detuning is small, or if the amplitude of the acoustics is large enough. Z153 provided a better propagation speed of the flame such that the detuning decreased through an increased effective speed of sound, and therefore the coupling strengthened resulting in a larger amplitude, as seen in the experiments.</p>}},
author = {{Jarfors, B. and Fureby, C.}},
booktitle = {{AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026}},
isbn = {{9781624107658}},
language = {{eng}},
publisher = {{American Institute of Aeronautics and Astronautics}},
series = {{AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2026}},
title = {{Large Eddy Simulation of Thermo-Acoustic Instabilities in Bluff-Body Stabilized Flames; A Comparison Between Jet-A and C1}},
url = {{http://dx.doi.org/10.2514/6.2026-2408}},
doi = {{10.2514/6.2026-2408}},
year = {{2026}},
}