DC Field | Value | Language |
---|---|---|
dc.contributor.author | Moon, Kihun | ko |
dc.contributor.author | Bae, Dahyun | ko |
dc.contributor.author | Kim, Kyu Tae | ko |
dc.date.accessioned | 2023-07-18T05:00:11Z | - |
dc.date.available | 2023-07-18T05:00:11Z | - |
dc.date.created | 2023-07-05 | - |
dc.date.created | 2023-07-05 | - |
dc.date.issued | 2023-09 | - |
dc.identifier.citation | COMBUSTION AND FLAME, v.255 | - |
dc.identifier.issn | 0010-2180 | - |
dc.identifier.uri | http://hdl.handle.net/10203/310572 | - |
dc.description.abstract | Can-to-can acoustic interactions in a circumferential network of lean-premixed combustors have a prominent role in the development of complicated modal dynamics and large-scale pattern formations in can-annular gas turbine combustion systems. Despite recent progress in understanding these instabilities, however, previous relevant studies have been limited to an even number of constituent combustors; a fundamental characteristic of the modal dynamics in a can-annular arrangement consisting of an odd number of combustors remains unknown. To address this question, we compare key features of thermoacoustic instabilities in four-coupled (N = 4) and five-coupled (N = 5) can-annular combustor configurations obtained over a broad range of operating conditions. In conjunction with FEM-based Helmholtz simulations, our experimental data show that the dynamic behavior of the even-N case is characterized by the well-known interaction pattern, out-of-phase alternating modulations among the networked combustors. For the odd-N case, however, the can-annular system features complex phase dynamics originating from simultaneous excitation of the degenerate mode pair. We highlight that the development of self-excited azimuthal instabilities in the annular cross-talk section is associated with the modal interaction of the degenerate pair in the odd-N configuration. The initially degenerate pair can be split into two closely-spaced non-degenerate modes, and in consequence their modal interaction gives rise to a periodic transition between spinning and standing azimuthal modes in the annulus. Despite the formation of remarkably different inter-combustor interactions in the two can-annular configurations, however, the entire set of instability data collapses into very similar frequency regimes, suggesting the importance of flame-acoustic interactions occurring within each combustor, namely intra-combustor interactions. | - |
dc.language | English | - |
dc.publisher | ELSEVIER SCIENCE INC | - |
dc.title | Modal dynamics of self-excited thermoacoustic instabilities in even and odd numbered networks of lean-premixed combustors | - |
dc.type | Article | - |
dc.identifier.wosid | 001029145600001 | - |
dc.identifier.scopusid | 2-s2.0-85164254927 | - |
dc.type.rims | ART | - |
dc.citation.volume | 255 | - |
dc.citation.publicationname | COMBUSTION AND FLAME | - |
dc.identifier.doi | 10.1016/j.combustflame.2023.112928 | - |
dc.contributor.localauthor | Kim, Kyu Tae | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Combustion instability | - |
dc.subject.keywordAuthor | Can -annular combustor | - |
dc.subject.keywordAuthor | Cross talk | - |
dc.subject.keywordAuthor | Degenerate | - |
dc.subject.keywordAuthor | Gas turbine combustion | - |
dc.subject.keywordAuthor | Azimuthal instability | - |
dc.subject.keywordPlus | CROSS-TALK | - |
dc.subject.keywordPlus | RAYLEIGH CRITERION | - |
dc.subject.keywordPlus | PHASE-LOCKING | - |
dc.subject.keywordPlus | MODES | - |
dc.subject.keywordPlus | FLUCTUATIONS | - |
dc.subject.keywordPlus | OSCILLATIONS | - |
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