DC Field | Value | Language |
---|---|---|
dc.contributor.author | Moon, Kihun | ko |
dc.contributor.author | Jegal, Hyunwook | ko |
dc.contributor.author | Yoon, Changjin | ko |
dc.contributor.author | Kim, Kyu Tae | ko |
dc.date.accessioned | 2020-10-13T06:55:19Z | - |
dc.date.available | 2020-10-13T06:55:19Z | - |
dc.date.created | 2020-07-13 | - |
dc.date.created | 2020-07-13 | - |
dc.date.issued | 2020-07 | - |
dc.identifier.citation | COMBUSTION AND FLAME, v.220, pp.178 - 188 | - |
dc.identifier.issn | 0010-2180 | - |
dc.identifier.uri | http://hdl.handle.net/10203/276522 | - |
dc.description.abstract | The prediction of self-excited combustion instabilities in a can-annular gas turbine combustion system is a significant challenge, mainly because the instabilities originate from the acoustic interactions between adjacent combustors via a cross-talk region upstream of the first stage turbine nozzles. Detailed characterization of these instabilities requires a thorough understanding of engine-level dynamics. Until now, a comprehensive experimental examination of such a can-annular configuration had not been conducted. Here we present new experiments using four lean fully-premixed swirl-stabilized combustors connected via a full-annular cross-talk section. We demonstrate that the global fluctuations at limit cycles are either in-phase interactions (push-push modes) or one of two different forms of out-of-phase interactions (push-pull modes), subject to uniform and non-uniform equivalence ratio combinations. Under certain symmetric conditions, the can-annular system undergoes in-phase synchronous modulations (Type I), giving rise to the formation of pressure antinodes at the inlets of the four combustors and in the cross-talk region. By contrast, out-of-phase interactions are sustained in the form of either an alternating pattern in four-coupled combustors (Type II) or a push-pull interaction in two opposite combustors only (Type III). The latter is dictated by strong out-of-phase fluctuations between two of the combustors and a pressure node-like condition - thermoacoustically decoupled from the global fluctuations - over the entire region of the other two combustors, experimentally demonstrating the existence of mode localization in can-annular thermoacoustic instabilities. We show that the mode clustering phenomenon is responsible for the excitation of closely-spaced multiple eigenmodes in the can-annular acoustic environment, and as a consequence the system can feature a mixed state with several distinct types of interaction patterns. By analyzing a large amount of experimental data acquired systematically for coupled two-combustor and four-can-annular configurations, we demonstrate that longitudinal-mode instabilities in a can-annular combustion system will preferentially emerge in the form of out-of-phase interactions. | - |
dc.language | English | - |
dc.publisher | ELSEVIER SCIENCE INC | - |
dc.title | Cross-talk-interaction-induced combustion instabilities in a can-annular lean-premixed combustor configuration | - |
dc.type | Article | - |
dc.identifier.wosid | 000571840100003 | - |
dc.identifier.scopusid | 2-s2.0-85087619810 | - |
dc.type.rims | ART | - |
dc.citation.volume | 220 | - |
dc.citation.beginningpage | 178 | - |
dc.citation.endingpage | 188 | - |
dc.citation.publicationname | COMBUSTION AND FLAME | - |
dc.identifier.doi | 10.1016/j.combustflame.2020.06.041 | - |
dc.contributor.localauthor | Kim, Kyu Tae | - |
dc.contributor.nonIdAuthor | Yoon, Changjin | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | Can-annular combustor | - |
dc.subject.keywordAuthor | Can-to-can interaction | - |
dc.subject.keywordAuthor | Combustion instability | - |
dc.subject.keywordAuthor | Cross-talk | - |
dc.subject.keywordAuthor | Gas turbine combustion | - |
dc.subject.keywordAuthor | Lean-premixed | - |
dc.subject.keywordPlus | RAYLEIGH CRITERION | - |
dc.subject.keywordPlus | PHASE-LOCKING | - |
dc.subject.keywordPlus | GAS | - |
dc.subject.keywordPlus | MECHANISMS | - |
dc.subject.keywordPlus | DYNAMICS | - |
dc.subject.keywordPlus | FLAMES | - |
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