NEAR-BLOWOFF DYNAMICS OF BLUFF-BODY-STABILIZED PREMIXED HYDROGEN/AIR FLAMES IN A NARROW CHANNEL

Handle URI:
http://hdl.handle.net/10754/576854
Title:
NEAR-BLOWOFF DYNAMICS OF BLUFF-BODY-STABILIZED PREMIXED HYDROGEN/AIR FLAMES IN A NARROW CHANNEL
Authors:
Lee, Bok Jik; Yoo, Chun Sang; Im, Hong G. ( 0000-0001-7080-1266 )
Abstract:
The flame stability is known to be significantly enhanced when the flame is attached to a bluff-body. The main interest of this study is on the stability of the flame in a meso-scale channel, considering applications such as combustion-based micro power generators. We investigate the dynamics of lean premixed hydrogen/air flames stabilized behind a square box in a two-dimensional meso-scale channel with high-fidelity numerical simulations. Characteristics of both non-reacting flows and reacting flows over the bluff-body are studied for a range of the mean inflow velocity. The flame stability in reacting flows is investigated by ramping up the mean inflow velocity step by step. As the inlet velocity is increased, the initially stable steady flames undergo a transition to an unsteady mode of regular asymmetric fluctuation. When the inlet velocity is further increased, the flame is eventually blown off. Between the regular fluctuation mode and blowoff limit, there exists a narrow range of the inlet velocity where the flames exhibit periodic local extinction and recovery. Approaching further to blowoff limit, the local extinction and recovery becomes highly transient and a failure of recovery leads blowoff and extinction of the flame kernel.
KAUST Department:
Clean Combustion Research Center
Journal:
MCS 9
Conference/Event name:
MCS-2015: Ninth Mediterranean Combustion Symposium
Issue Date:
7-Jun-2015
Type:
Conference Paper
Additional Links:
http://csyoo.unist.ac.kr/wp-content/uploads/sites/192/2015/08/mcs_lee_yoo_im.pdf
Appears in Collections:
Conference Papers; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLee, Bok Jiken
dc.contributor.authorYoo, Chun Sangen
dc.contributor.authorIm, Hong G.en
dc.date.accessioned2015-09-06T13:46:58Zen
dc.date.available2015-09-06T13:46:58Zen
dc.date.issued2015-06-07en
dc.identifier.urihttp://hdl.handle.net/10754/576854en
dc.description.abstractThe flame stability is known to be significantly enhanced when the flame is attached to a bluff-body. The main interest of this study is on the stability of the flame in a meso-scale channel, considering applications such as combustion-based micro power generators. We investigate the dynamics of lean premixed hydrogen/air flames stabilized behind a square box in a two-dimensional meso-scale channel with high-fidelity numerical simulations. Characteristics of both non-reacting flows and reacting flows over the bluff-body are studied for a range of the mean inflow velocity. The flame stability in reacting flows is investigated by ramping up the mean inflow velocity step by step. As the inlet velocity is increased, the initially stable steady flames undergo a transition to an unsteady mode of regular asymmetric fluctuation. When the inlet velocity is further increased, the flame is eventually blown off. Between the regular fluctuation mode and blowoff limit, there exists a narrow range of the inlet velocity where the flames exhibit periodic local extinction and recovery. Approaching further to blowoff limit, the local extinction and recovery becomes highly transient and a failure of recovery leads blowoff and extinction of the flame kernel.en
dc.relation.urlhttp://csyoo.unist.ac.kr/wp-content/uploads/sites/192/2015/08/mcs_lee_yoo_im.pdfen
dc.titleNEAR-BLOWOFF DYNAMICS OF BLUFF-BODY-STABILIZED PREMIXED HYDROGEN/AIR FLAMES IN A NARROW CHANNELen
dc.typeConference Paperen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalMCS 9en
dc.conference.date7-11 June 2015en
dc.conference.nameMCS-2015: Ninth Mediterranean Combustion Symposiumen
dc.conference.locationSheraton Rhodes Resort, Rhodes, Greeceen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionSchool of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Koreaen
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