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https://doi.org/10.21256/zhaw-28149| Publication type: | Article in scientific journal |
| Type of review: | Peer review (publication) |
| Title: | Autoignition delay modulation by high-frequency thermoacoustic oscillations in reheat flames |
| Authors: | McClure, Jonathan Bothien, Mirko Sattelmayer, Thomas |
| et. al: | No |
| DOI: | 10.1016/j.proci.2022.08.047 10.21256/zhaw-28149 |
| Published in: | Proceedings of the Combustion Institute |
| Volume(Issue): | 39 |
| Issue: | 4 |
| Page(s): | 4691 |
| Pages to: | 4700 |
| Issue Date: | 2022 |
| Publisher / Ed. Institution: | Elsevier |
| ISSN: | 1540-7489 1873-2704 |
| Language: | English |
| Subjects: | Autoignition; Reheat combustion; Thermoacoustics; Gas turbine; High frequency |
| Subject (DDC): | 620: Engineering |
| Abstract: | This paper investigates the sensitivity of the autoignition delay in reheat flames to acoustic pulsations associ- ated with high-frequency transverse thermoacoustic oscillations. A reduced order model for the response of purely autoignition-stabilised flames to acoustic disturbances is compared with experimental observations. The experiments identified periodic flame motion associated with high-amplitude transverse limit-cycle os- cillations in an atmospheric pressure reheat combustor. This flame motion was assumed to be the result of a superposition of two flame-acoustic coupling mechanisms: autoignition delay modulation by the oscillating acoustic field and displacement and deformation of the flame by the acoustic velocity. The reduced order model coupled to reaction kinetics calculations reveals that a significant portion of the observed flame mo- tion can be attributed to autoignition delay modulation. The ignition position responds instantaneously to the acoustic pressure at the time of ignition, as observed experimentally. The model also provides insight into the importance of the history of acoustic disturbances experienced by the fuel-air mixture prior to ignition. Due to the high-frequency nature of the instability, a fluid particle can experience multiple oscillation cycles before ignition. The ignition delay responds in-phase with the net-acoustic perturbation experienced by a fluid particle between injection and ignition. These findings shed light on the underlying mechanisms of the flame motion observed in experiments and provide useful insight into the importance of autoignition delay modulation as a driving mechanism of high-frequency thermoacoustic instabilities in reheat flames. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/28149 |
| Fulltext version: | Accepted version |
| License (according to publishing contract): | CC BY-NC-ND 4.0: Attribution - Non commercial - No derivatives 4.0 International |
| Restricted until: | 2024-10-24 |
| Departement: | School of Engineering |
| Organisational Unit: | Institute of Energy Systems and Fluid Engineering (IEFE) |
| Appears in collections: | Publikationen School of Engineering |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2023_McClure-etal_Autoignition-delay-modulation-reheat-flames.pdf Until 2024-10-24 | Accepted Version | 998.19 kB | Adobe PDF | View/Open |
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McClure, J., Bothien, M., & Sattelmayer, T. (2022). Autoignition delay modulation by high-frequency thermoacoustic oscillations in reheat flames. Proceedings of the Combustion Institute, 39(4), 4691–4700. https://doi.org/10.1016/j.proci.2022.08.047
McClure, J., Bothien, M. and Sattelmayer, T. (2022) ‘Autoignition delay modulation by high-frequency thermoacoustic oscillations in reheat flames’, Proceedings of the Combustion Institute, 39(4), pp. 4691–4700. Available at: https://doi.org/10.1016/j.proci.2022.08.047.
J. McClure, M. Bothien, and T. Sattelmayer, “Autoignition delay modulation by high-frequency thermoacoustic oscillations in reheat flames,” Proceedings of the Combustion Institute, vol. 39, no. 4, pp. 4691–4700, 2022, doi: 10.1016/j.proci.2022.08.047.
MCCLURE, Jonathan, Mirko BOTHIEN und Thomas SATTELMAYER, 2022. Autoignition delay modulation by high-frequency thermoacoustic oscillations in reheat flames. Proceedings of the Combustion Institute. 2022. Bd. 39, Nr. 4, S. 4691–4700. DOI 10.1016/j.proci.2022.08.047
McClure, Jonathan, Mirko Bothien, and Thomas Sattelmayer. 2022. “Autoignition Delay Modulation by High-Frequency Thermoacoustic Oscillations in Reheat Flames.” Proceedings of the Combustion Institute 39 (4): 4691–4700. https://doi.org/10.1016/j.proci.2022.08.047.
McClure, Jonathan, et al. “Autoignition Delay Modulation by High-Frequency Thermoacoustic Oscillations in Reheat Flames.” Proceedings of the Combustion Institute, vol. 39, no. 4, 2022, pp. 4691–700, https://doi.org/10.1016/j.proci.2022.08.047.
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