Large Eddy Simulation of Thermoacoustic Instabilities in Bluff-Body Stabilized Flames
(2025) AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025 In AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025- Abstract
The present study investigates the thermoacoustic instability for triangular bluff-body stabilized flames using high fidelity Large Eddy Simulations with finite-rate chemistry. The study includes premixed propane-air combustion, studying the triggering of the thermoacoustic instability for different parameters such as, incoming turbulence intensity, inlet velocity and temperature, and equivalence ratio. The results are analyzed using qualitative and quantitative comparison with experiments as well as discrete Fourier and wavelet transforms to obtain frequency information. This is a widely studied subject, however, there are still gaps in the knowledge regarding thermoacoustic instabilities, such as triggering mechanisms, and due to the... (More)
The present study investigates the thermoacoustic instability for triangular bluff-body stabilized flames using high fidelity Large Eddy Simulations with finite-rate chemistry. The study includes premixed propane-air combustion, studying the triggering of the thermoacoustic instability for different parameters such as, incoming turbulence intensity, inlet velocity and temperature, and equivalence ratio. The results are analyzed using qualitative and quantitative comparison with experiments as well as discrete Fourier and wavelet transforms to obtain frequency information. This is a widely studied subject, however, there are still gaps in the knowledge regarding thermoacoustic instabilities, such as triggering mechanisms, and due to the importance of this understanding for safe operations, there is a need for further research. Currently the aviation industry is increasing their use of sustainable jet fuels, and the impact of this on the triggering of thermoacoustics need to be understood to maintain these safe operations. The current study was able to reproduce thermoacoustically stable and unstable cases which agreed with experimental results. The authors hypothesized on the mechanism for which thermoacoustics were instigated. This included penetration of radical species into the recirculation zone, leading to low, but not necessarily negligible heat release, which occurs at a different rate than the combustion in the shear layers. More studies are needed to verify this mechanism. The next step is to perform similar studies for conventional jet fuels and biofuels.
(Less)
- author
- Jarfors, B. LU and Fureby, C. LU
- organization
- publishing date
- 2025
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025
- series title
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025
- publisher
- American Institute of Aeronautics and Astronautics
- conference name
- AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025
- conference location
- Orlando, United States
- conference dates
- 2025-01-06 - 2025-01-10
- external identifiers
-
- scopus:105001239805
- ISBN
- 9781624107238
- DOI
- 10.2514/6.2025-2488
- language
- English
- LU publication?
- yes
- id
- e8575b3b-62ef-4f2e-baf4-05b93043922c
- date added to LUP
- 2025-09-08 14:24:40
- date last changed
- 2025-09-08 14:24:53
@inproceedings{e8575b3b-62ef-4f2e-baf4-05b93043922c,
abstract = {{<p>The present study investigates the thermoacoustic instability for triangular bluff-body stabilized flames using high fidelity Large Eddy Simulations with finite-rate chemistry. The study includes premixed propane-air combustion, studying the triggering of the thermoacoustic instability for different parameters such as, incoming turbulence intensity, inlet velocity and temperature, and equivalence ratio. The results are analyzed using qualitative and quantitative comparison with experiments as well as discrete Fourier and wavelet transforms to obtain frequency information. This is a widely studied subject, however, there are still gaps in the knowledge regarding thermoacoustic instabilities, such as triggering mechanisms, and due to the importance of this understanding for safe operations, there is a need for further research. Currently the aviation industry is increasing their use of sustainable jet fuels, and the impact of this on the triggering of thermoacoustics need to be understood to maintain these safe operations. The current study was able to reproduce thermoacoustically stable and unstable cases which agreed with experimental results. The authors hypothesized on the mechanism for which thermoacoustics were instigated. This included penetration of radical species into the recirculation zone, leading to low, but not necessarily negligible heat release, which occurs at a different rate than the combustion in the shear layers. More studies are needed to verify this mechanism. The next step is to perform similar studies for conventional jet fuels and biofuels.</p>}},
author = {{Jarfors, B. and Fureby, C.}},
booktitle = {{AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025}},
isbn = {{9781624107238}},
language = {{eng}},
publisher = {{American Institute of Aeronautics and Astronautics}},
series = {{AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025}},
title = {{Large Eddy Simulation of Thermoacoustic Instabilities in Bluff-Body Stabilized Flames}},
url = {{http://dx.doi.org/10.2514/6.2025-2488}},
doi = {{10.2514/6.2025-2488}},
year = {{2025}},
}