Experimental investigation of lean-premixed hydrogen combustion instabilities in a can-annular combustion system

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dc.contributor.authorMoon, Kihunko
dc.contributor.authorChoi, Yongseokko
dc.contributor.authorKim, Kyu Taeko
dc.date.accessioned2021-12-14T06:40:49Z-
dc.date.available2021-12-14T06:40:49Z-
dc.date.created2021-08-31-
dc.date.created2021-08-31-
dc.date.created2021-08-31-
dc.date.issued2022-01-
dc.identifier.citationCOMBUSTION AND FLAME, v.235-
dc.identifier.issn0010-2180-
dc.identifier.urihttp://hdl.handle.net/10203/290520-
dc.description.abstractThermoacoustic interactions in a circumferential network of lean-premixed combustors have a substantial impact on engine-level dynamics in a can-annular gas turbine combustion system. Previous experimental and numerical studies have focused on identifying the formation of large-scale interaction patterns and the modal dynamics of multiple eigenmodes. Since those investigations were primarily concerned with low-frequency interactions between adjacent combustors, there are currently no experimental observations that enable decisive discrimination between low- and high-frequency can-annular combustion instabilities. Here, we use pure hydrogen-air flame ensembles to trigger higher acoustic modes in four-coupled lean-premixed combustors, ultimately to understand the potential influence of self-excited instabilities on the spatiotemporal evolution of a can-annular system. The use of lean-premixed hydrogen-air flames enables measurements of previously unidentified phenomena, particularly in association with the excitation of high acoustic modes up to approximately 1.3 kHz. We demonstrate that self-excited standing azimuthal modes can be excited in the annular cross-talk section, particularly when the phase dynamics of the upstream flame tube sections are defined by alternating anti-phase oscillations. In this case, the temporal evolution of the can-annular system is governed by twofold degeneracy, incorporating an alternating push-pull mode in the longitudinal direction and a standing azimuthal mode in the circumferential direction at the same frequency. Based on experimental observations and Helmholtz simulations, we also show that a mixed state of synchronization and desynchronization can arise simultaneously as a result of symmetry breaking. The coexistence of coherent and incoherent motions is observed to be controlled by interactions between two closely spaced, but slightly misaligned, localized in-phase modes; this observation demonstrates experimentally the existence of a chiral state in can-annular thermoacoustics. The present results, for the first time, reveal a variety of phenomena involved in the response of a can-annular combustion system to higher frequency acoustic perturbations.-
dc.languageEnglish-
dc.publisherELSEVIER SCIENCE INC-
dc.titleExperimental investigation of lean-premixed hydrogen combustion instabilities in a can-annular combustion system-
dc.typeArticle-
dc.identifier.wosid000735767500011-
dc.identifier.scopusid2-s2.0-85113936731-
dc.type.rimsART-
dc.citation.volume235-
dc.citation.publicationnameCOMBUSTION AND FLAME-
dc.identifier.doi10.1016/j.combustflame.2021.111697-
dc.contributor.localauthorKim, Kyu Tae-
dc.contributor.nonIdAuthorChoi, Yongseok-
dc.description.isOpenAccessN-
dc.type.journalArticleArticle-
dc.subject.keywordAuthorAzimuthal instabilitiesCan-annular combustorCombustion instabilityGas turbine combustionHydrogenSynchronization-
dc.subject.keywordPlusEXCITED AZIMUTHAL MODESCROSS-TALKDYNAMICS-
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AE-Journal Papers(저널논문)
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