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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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A DNS study on the stabilization mechanism of a turbulent lifted ethylene jet flame in highly-heated coflow

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Title
A DNS study on the stabilization mechanism of a turbulent lifted ethylene jet flame in highly-heated coflow
Author
Yoo, Chun SangRichardson, Edward S.Sankaran, RamananChen, Jacqueline H.
Issue Date
2011-01
Publisher
ELSEVIER SCIENCE INC
Citation
PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.33, no.1, pp.1619 - 1627
Abstract
Direct numerical simulation (DNS) of the near-field of a three-dimensional spatially-developing turbulent ethylene jet flame in highly-heated coflow is performed with a reduced mechanism to determine the stabilization mechanism. The DNS was performed at a jet Reynolds number of 10,000 with over 1.29 billion grid points. The results show that auto-ignition in a fuel-lean mixture at the flame base is the main source of stabilization of the lifted jet flame. The Damkohler number and chemical explosive mode (CEM) analysis also verify that auto-ignition occurs at the flame base. In addition to auto-ignition, Lagrangian tracking of the flame base reveals the passage of large-scale flow structures and their correlation with the fluctuations of the flame base similar to a previous study (Yoo et al., J. Fluid Mech. 640 (2009) 453-481) with hydrogen/air jet flames. It is also observed that the present lifted flame base exhibits a cyclic 'saw-tooth' shaped movement marked by rapid movement upstream and slower movement downstream. This is a consequence of the lifted flame being stabilized by a balance between consecutive auto-ignition events in hot fuel-lean mixtures and convection induced by the high-speed jet and coflow velocities. This is confirmed by Lagrangian tracking of key variables including the flame-normal velocity, displacement speed, scalar dissipation rate, and mixture fraction at the stabilization point.
URI
https://scholarworks.unist.ac.kr/handle/201301/3031
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=78650893486
DOI
10.1016/j.proci.2010.06.147
ISSN
1540-7489
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