DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Taesong | ko |
dc.contributor.author | Kim, Kyu Tae | ko |
dc.date.accessioned | 2021-03-15T00:31:17Z | - |
dc.date.available | 2021-03-15T00:31:17Z | - |
dc.date.created | 2021-03-08 | - |
dc.date.created | 2021-03-08 | - |
dc.date.created | 2021-03-08 | - |
dc.date.issued | 2021-01-27 | - |
dc.identifier.citation | The 38th International Symposium on Combustion | - |
dc.identifier.uri | http://hdl.handle.net/10203/281517 | - |
dc.description.abstract | The present experimental investigation demonstrates important trends and offers physical insights into self-excited combustion instabilities in mesoscale multinozzle flames composed of sixty small injectors. Here we focus on the response of a prototypical micromixer-type injector assembly, fabricated using an additive manufacturing technique, in comparison with the behavior of conventional large-scale swirl-stabilized flames. Our results highlight that the development of self-excited instabilities in unconventional mesoscale flames is fundamentally different from that in large-scale swirl flames, in terms of the onset of instabilities, nonlinear modal dynamics, and amplitude/frequency of limit cycle oscillations under the same operating conditions. These differences are attributable to the alteration in local flow/flame structures and the resulting flameto-flame/flame-wall interaction mechanisms. An integrated analysis of large datasets reveals that the two interacting swirl-stabilized flames tend to couple strongly with a low-frequency L1 mode at about 220 Hz, whereas the sixty-injector small-scale flames are capable of triggering multiple higher-frequency instabilities at 310, 470, and 600 Hz. That is, the use of the micromixer-type injector assembly in a lean-premixed system causes the occurrence of combustion instabilities to shift toward a higher equivalence ratio. However, due to the absence of a large recirculation zone near the primary reaction region, the combustion system equipped with the small-scale multinozzle injectors was found to suffer from lean blowoff phenomena at low equivalence ratio. | - |
dc.language | English | - |
dc.publisher | The Combustion Institute | - |
dc.title | Direct comparison of self-excited instabilities in mesoscale multinozzle flames and conventional large-scale swirl-stabilized flames | - |
dc.type | Conference | - |
dc.identifier.wosid | 000640387700019 | - |
dc.identifier.scopusid | 2-s2.0-85089678654 | - |
dc.type.rims | CONF | - |
dc.citation.publicationname | The 38th International Symposium on Combustion | - |
dc.identifier.conferencecountry | AT | - |
dc.identifier.conferencelocation | Adelaide Convention Centre | - |
dc.identifier.doi | 10.1016/j.proci.2020.05.049 | - |
dc.contributor.localauthor | Kim, Kyu Tae | - |
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