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dc.contributor.authorGhirardo, G.-
dc.contributor.authorGant, F.-
dc.contributor.authorBoudy, F.-
dc.contributor.authorBothien, M.-
dc.date.accessioned2021-08-26T12:14:02Z-
dc.date.available2021-08-26T12:14:02Z-
dc.date.issued2021-02-
dc.identifier.issn0742-4795de_CH
dc.identifier.issn1528-8919de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/23025-
dc.description.abstractThis paper first characterizes the acoustic field of two annular combustors by means of data from acoustic pressure sensors. In particular, the amplitude, orientation, and nature of the acoustic field of azimuthal order n are characterized. The dependence of the pulsa- tion amplitude on the azimuthal location in the chamber is discussed, and a protection scheme making use of just one sensor is proposed. The governing equations are then introduced, and a low-order model of the instabilities is discussed. The model accounts for the nonlinear response of M distinct flames, for system acoustic losses by means of an acoustic damping coefficient a and for the turbulent combustion noise, modeled by means of the background noise coefficient r. Keeping the response of the flames arbitrary and in principle different from flame to flame, we show that, together with a and r, only the sum of their responses and their 2n Fourier component in the azimuthal direction affect the dynamics of the azimuthal instability. The existing result that only this 2n Fourier compo- nent affects the stability of standing limit-cycle solutions is recovered. It is found that this result applies also to the case of a nonhomogeneous flame response in the annulus, and to flame responses that respond to the azimuthal acoustic velocity. Finally, a parametric flame model is proposed, depending on a linear driving gain b and a nonlinear saturation constant j. The model is first mapped from continuous time to discrete time, and then recast as a probabilistic Markovian model. The identification of the parameters fa; b; j; rg is then carried out on engine time-series data. The optimal four parameters fa;r;b;jg are estimated as the values that maximize the data likelihood. Once the parameters have been estimated, the phase space of the identified low-order problem is discussed on selected invariant manifolds of the dynamical system.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.rightsLicence according to publishing contractde_CH
dc.subjectThermoacousticsde_CH
dc.subjectAzimuthal modesde_CH
dc.subjectIdentificationde_CH
dc.subjectGas turbinesde_CH
dc.subject.ddc621.04: Energietechnikde_CH
dc.titleProtection and identification of thermoacoustic azimuthal modesde_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.doi10.1115/1.4049909de_CH
zhaw.funding.euNode_CH
zhaw.issue4de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.start041021de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume143de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
zhaw.author.additionalNode_CH
zhaw.display.portraitYesde_CH
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Ghirardo, G., Gant, F., Boudy, F., & Bothien, M. (2021). Protection and identification of thermoacoustic azimuthal modes. Journal of Engineering for Gas Turbines and Power, 143(4), 41021. https://doi.org/10.1115/1.4049909
Ghirardo, G. et al. (2021) ‘Protection and identification of thermoacoustic azimuthal modes’, Journal of Engineering for Gas Turbines and Power, 143(4), p. 041021. Available at: https://doi.org/10.1115/1.4049909.
G. Ghirardo, F. Gant, F. Boudy, and M. Bothien, “Protection and identification of thermoacoustic azimuthal modes,” Journal of Engineering for Gas Turbines and Power, vol. 143, no. 4, p. 041021, Feb. 2021, doi: 10.1115/1.4049909.
GHIRARDO, G., F. GANT, F. BOUDY und M. BOTHIEN, 2021. Protection and identification of thermoacoustic azimuthal modes. Journal of Engineering for Gas Turbines and Power. Februar 2021. Bd. 143, Nr. 4, S. 041021. DOI 10.1115/1.4049909
Ghirardo, G., F. Gant, F. Boudy, and M. Bothien. 2021. “Protection and Identification of Thermoacoustic Azimuthal Modes.” Journal of Engineering for Gas Turbines and Power 143 (4): 41021. https://doi.org/10.1115/1.4049909.
Ghirardo, G., et al. “Protection and Identification of Thermoacoustic Azimuthal Modes.” Journal of Engineering for Gas Turbines and Power, vol. 143, no. 4, Feb. 2021, p. 41021, https://doi.org/10.1115/1.4049909.


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