Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-27670
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dc.contributor.authorJohn, Tony-
dc.contributor.authorAcharya, Vishal-
dc.contributor.authorBothien, Mirko-
dc.contributor.authorLieuwen, Timothy-
dc.date.accessioned2023-04-19T14:48:43Z-
dc.date.available2023-04-19T14:48:43Z-
dc.date.issued2023-
dc.identifier.issn0010-2180de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/27670-
dc.description.abstractPractical 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.de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofCombustion and Flamede_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectThermoacoustic oscillationde_CH
dc.subjectStochastic dynamicsde_CH
dc.subject.ddc620: Ingenieurwesende_CH
dc.titleDynamics of coupled thermoacoustic modes : noise and frequency spacing effectsde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitut für Energiesysteme und Fluid-Engineering (IEFE)de_CH
dc.identifier.doi10.1016/j.combustflame.2023.112738de_CH
dc.identifier.doi10.21256/zhaw-27670-
zhaw.funding.euNode_CH
zhaw.issue112738de_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statusacceptedVersionde_CH
zhaw.volume252de_CH
zhaw.embargo.end2025-04-05de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedDezentrale Thermische Energiesystemede_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
Appears in collections:Publikationen School of Engineering

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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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