Dynamics of bluff-body-stabilized premixed hydrogen/air flames in a narrow channel

Handle URI:
http://hdl.handle.net/10754/566104
Title:
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:
Two-dimensional direct numerical simulations were conducted for bluff-body stabilized flames of a lean hydrogen/air mixture at near-blowoff conditions in a meso-scale channel. Parametric simulations were conducted by incrementally varying the inflow velocity in the vicinity of the blowoff limit, and the corresponding flame response was monitored. The present study is a showcase of combustion DNS with embedded boundary representation, and full demonstration of the detailed visualization of the near-blowoff flame characteristics. As the inflow velocity approaches blowoff limit, the flame dynamics exhibit a complex sequence of events, such as periodic local extinction and recovery, and regrowth of the bulk flame by the flame segments attached behind the bluff-body. The total extinction is observed as the attached flames shrink down and are no longer able to regrow the bulk flames. Despite the disparity in the physical scale under study, the observed sequence of the extinction pathway shows a strong similarity with experimental observations at larger scale combustion systems. © 2015 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
Jun-2015
DOI:
10.1016/j.combustflame.2015.03.009
Type:
Article
ISSN:
00102180
Appears in Collections:
Articles; 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.accessioned2015-08-12T09:28:23Zen
dc.date.available2015-08-12T09:28:23Zen
dc.date.issued2015-06en
dc.identifier.issn00102180en
dc.identifier.doi10.1016/j.combustflame.2015.03.009en
dc.identifier.urihttp://hdl.handle.net/10754/566104en
dc.description.abstractTwo-dimensional direct numerical simulations were conducted for bluff-body stabilized flames of a lean hydrogen/air mixture at near-blowoff conditions in a meso-scale channel. Parametric simulations were conducted by incrementally varying the inflow velocity in the vicinity of the blowoff limit, and the corresponding flame response was monitored. The present study is a showcase of combustion DNS with embedded boundary representation, and full demonstration of the detailed visualization of the near-blowoff flame characteristics. As the inflow velocity approaches blowoff limit, the flame dynamics exhibit a complex sequence of events, such as periodic local extinction and recovery, and regrowth of the bulk flame by the flame segments attached behind the bluff-body. The total extinction is observed as the attached flames shrink down and are no longer able to regrow the bulk flames. Despite the disparity in the physical scale under study, the observed sequence of the extinction pathway shows a strong similarity with experimental observations at larger scale combustion systems. © 2015 The Combustion Institute.en
dc.publisherElsevier BVen
dc.subjectBlow-offen
dc.subjectBluff-body-stabilized flamesen
dc.subjectDirect numerical simulationen
dc.subjectPremixed flamesen
dc.titleDynamics of bluff-body-stabilized premixed hydrogen/air flames in a narrow channelen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionSchool of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Koreaen
kaust.authorLee, Bok Jiken
kaust.authorIm, Hong G.en
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