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Yoo, Chun Sang
Clean Combustion & Energy Research Lab
Research Interests
  • Carbon-free combustion
  • Numerical turbulent combustion
  • Combustion modelling
  • Hydrogen/Ammonia Gas turbine combustion

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

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Title
Dynamics of bluff-body-stabilized premixed hydrogen/air flames in a narrow channel
Author
Lee, Bok JikYoo, Chun SangIm, Hong G.
Issue Date
2015-06
Publisher
ELSEVIER SCIENCE INC
Citation
COMBUSTION AND FLAME, v.162, no.6, pp.2602 - 2609
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.
URI
https://scholarworks.unist.ac.kr/handle/201301/11361
URL
http://www.sciencedirect.com/science/article/pii/S001021801500084X
DOI
10.1016/j.combustflame.2015.03.009
ISSN
0010-2180
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