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https://doi.org/10.21256/zhaw-27670| Publication type: | Article in scientific journal |
| Type of review: | Peer review (publication) |
| Title: | Dynamics of coupled thermoacoustic modes : noise and frequency spacing effects |
| Authors: | John, Tony Acharya, Vishal Bothien, Mirko Lieuwen, Timothy |
| et. al: | No |
| DOI: | 10.1016/j.combustflame.2023.112738 10.21256/zhaw-27670 |
| Published in: | Combustion and Flame |
| Volume(Issue): | 252 |
| Issue: | 112738 |
| Issue Date: | 2023 |
| Publisher / Ed. Institution: | Elsevier |
| ISSN: | 0010-2180 |
| Language: | English |
| Subjects: | Thermoacoustic oscillation; Stochastic dynamics |
| Subject (DDC): | 620: Engineering |
| Abstract: | Practical combustion systems consist of multiple thermoacoustic modes that are linearly stable or unsta- ble at a wide range of frequencies. When coupled, the modal interactions are a strong function of the frequency spacing between them –having very significant implications on interpretation of linear sta- bility or instability of modes from experimental data. Frequency spacing between the modes particularly influences the stability and existence of potential limit cycle solutions. In this paper, we extend earlier deterministic studies to include the effects of noise, studying how deterministic dynamics change with the addition of noise and the simultaneous impact of frequency spacing (i.e., closely, or widely spaced). Specifically, this paper characterizes three key effects of noise, which are (1) distribution of limit cycle amplitudes (“diffusion”), (2) shift in the average limit cycle amplitudes (“noise induced drift”), and (3) introduction of new bifurcations that are not present in the deterministic system. Key conclusions from this work are that in highly noisy practical environments, a deterministic/ low noise analysis will not be sufficient to explain even critical qualitative features of the system –such as existence of stable limit cycles or their amplitudes. Moreover, the nature of noise-induced effects on nonlinear modal interactions can be fundamentally different for degenerate, closely spaced, and widely spaced modes. |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/27670 |
| Fulltext version: | Accepted version |
| License (according to publishing contract): | Licence according to publishing contract |
| Restricted until: | 2025-04-05 |
| 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_John-etal_Dynamics-of-coupled-thermoacoustic-modes.pdf Until 2025-04-05 | Accepted Version | 8.36 MB | Adobe PDF | View/Open |
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John, T., Acharya, V., Bothien, M., & Lieuwen, T. (2023). Dynamics of coupled thermoacoustic modes : noise and frequency spacing effects. Combustion and Flame, 252(112738). https://doi.org/10.1016/j.combustflame.2023.112738
John, T. et al. (2023) ‘Dynamics of coupled thermoacoustic modes : noise and frequency spacing effects’, Combustion and Flame, 252(112738). Available at: https://doi.org/10.1016/j.combustflame.2023.112738.
T. John, V. Acharya, M. Bothien, and T. Lieuwen, “Dynamics of coupled thermoacoustic modes : noise and frequency spacing effects,” Combustion and Flame, vol. 252, no. 112738, 2023, doi: 10.1016/j.combustflame.2023.112738.
JOHN, Tony, Vishal ACHARYA, Mirko BOTHIEN und Timothy LIEUWEN, 2023. Dynamics of coupled thermoacoustic modes : noise and frequency spacing effects. Combustion and Flame. 2023. Bd. 252, Nr. 112738. DOI 10.1016/j.combustflame.2023.112738
John, Tony, Vishal Acharya, Mirko Bothien, and Timothy Lieuwen. 2023. “Dynamics of Coupled Thermoacoustic Modes : Noise and Frequency Spacing Effects.” Combustion and Flame 252 (112738). https://doi.org/10.1016/j.combustflame.2023.112738.
John, Tony, et al. “Dynamics of Coupled Thermoacoustic Modes : Noise and Frequency Spacing Effects.” Combustion and Flame, vol. 252, no. 112738, 2023, https://doi.org/10.1016/j.combustflame.2023.112738.
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