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Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-29606
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dc.contributor.authorÆsøy, Eirik-
dc.contributor.authorIndlekofer, Thomas-
dc.contributor.authorBothien, Mirko-
dc.contributor.authorDawson, James R.-
dc.date.accessioned2024-01-15T19:07:59Z-
dc.date.available2024-01-15T19:07:59Z-
dc.date.issued2023-
dc.identifier.issn0742-4795de_CH
dc.identifier.issn1528-8919de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/29606-
dc.description.abstractWe investigate the effect of increasing levels of hydrogen enrichment on the nonlinear response and saturation of premixed bluff-body stabilized methane/hydrogen flames submitted to acoustic forcing. The thermal power is kept approximately constant to preserve the nozzle velocity while increasing the flame speed through hydrogen enrichment. The flame describing function (FDF) is measured for a fixed frequency and three hydrogen–methane blends ranging from 10% to 50% by power, corresponding to 25% to 75% by volume. We show that when the flame is forced at the same frequency at similar power and bulk velocities, increasing levels of hydrogen enrichment increase the saturation amplitude of the flame. To provide insight into the flame dynamics responsible for the change in the global nonlinear response and saturation amplitude, the flames were investigated using high-speed imaging in combination with OH planar laser-induced fluorescence (OH-PLIF) at a range of forcing amplitudes. At lower hydrogen concentrations, the flame is stabilized along the inner shear layer and saturation in the heat release rate (HRR) occurs at lower forcing amplitudes due to large-scale flame–vortex interactions causing flame annihilation as observed in several previous studies. At increased levels of hydrogen enrichment, distinctly different flame dynamics are observed. In these cases, the flame accelerates and propagates across to the outer shear layer, which acts to suppress large-scale flame annihilation during roll-up of both the inner and outer shear layers. This results in a coherent increase in flame surface area with forcing amplitudes significantly increasing the saturation amplitude of the flame. These results show that high levels of hydrogen increase the amplitude response to acoustic forcing leading to higher saturation amplitudes. This suggests that substituting natural gas with hydrogen in gas turbines increases the risk of much higher limit-cycle amplitudes if self-excited instabilities occur.de_CH
dc.language.isoende_CH
dc.publisherThe American Society of Mechanical Engineersde_CH
dc.relation.ispartofJournal of Engineering for Gas Turbines and Powerde_CH
dc.rightshttp://creativecommons.org/licenses/by/4.0/de_CH
dc.subjectHydrogende_CH
dc.subjectFlame transfer functionde_CH
dc.subjectNonlinearde_CH
dc.subjectSaturationde_CH
dc.subjectThermoacousticsde_CH
dc.subject.ddc620: Ingenieurwesende_CH
dc.titleThe effect of hydrogen on nonlinear flame saturationde_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.doi10.1115/1.4063316de_CH
dc.identifier.doi10.21256/zhaw-29606-
zhaw.funding.euNode_CH
zhaw.issue11de_CH
zhaw.originated.zhawYesde_CH
zhaw.publication.statusacceptedVersionde_CH
zhaw.volume145de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.webfeedDezentrale Thermische Energiesystemede_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
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Æsøy, E., Indlekofer, T., Bothien, M., & Dawson, J. R. (2023). The effect of hydrogen on nonlinear flame saturation. Journal of Engineering for Gas Turbines and Power, 145(11). https://doi.org/10.1115/1.4063316
Æsøy, E. et al. (2023) ‘The effect of hydrogen on nonlinear flame saturation’, Journal of Engineering for Gas Turbines and Power, 145(11). Available at: https://doi.org/10.1115/1.4063316.
E. Æsøy, T. Indlekofer, M. Bothien, and J. R. Dawson, “The effect of hydrogen on nonlinear flame saturation,” Journal of Engineering for Gas Turbines and Power, vol. 145, no. 11, 2023, doi: 10.1115/1.4063316.
ÆSØY, Eirik, Thomas INDLEKOFER, Mirko BOTHIEN und James R. DAWSON, 2023. The effect of hydrogen on nonlinear flame saturation. Journal of Engineering for Gas Turbines and Power. 2023. Bd. 145, Nr. 11. DOI 10.1115/1.4063316
Æsøy, Eirik, Thomas Indlekofer, Mirko Bothien, and James R. Dawson. 2023. “The Effect of Hydrogen on Nonlinear Flame Saturation.” Journal of Engineering for Gas Turbines and Power 145 (11). https://doi.org/10.1115/1.4063316.
Æsøy, Eirik, et al. “The Effect of Hydrogen on Nonlinear Flame Saturation.” Journal of Engineering for Gas Turbines and Power, vol. 145, no. 11, 2023, https://doi.org/10.1115/1.4063316.


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