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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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Effects of H2O and NO on extinction and re-ignition of vortex-perturbed hydrogen counterflow flames

Cited 7 times inthomson ciCited 9 times inthomson ci
Title
Effects of H2O and NO on extinction and re-ignition of vortex-perturbed hydrogen counterflow flames
Author
Lee, Uen DoYoo, Chun SangChen, Jacqueline H.Frank, Jonathan H.
Issue Date
2009-01
Publisher
ELSEVIER SCIENCE INC
Citation
PROCEEDINGS OF THE COMBUSTION INSTITUTE, v.32, no.1, pp.1059 - 1066
Abstract
The influence of water vapor (H2O) and nitric oxide (NO) on the dynamics of extinction and re-ignition of a vortex-perturbed non-premixed hydrogen-air flame is investigated. A steady non-premixed flame is established in an axisymmetric counterflow configuration with a fuel stream of nitrogen-diluted hydrogen flowing against heated air containing 160 ppm of NO and various amounts of H2O ranging from 1.2% to 7.1% by volume. Local extinction is induced by a fuel-side vortex, and the temporal evolution of the hydroxyl radical (OH) field is measured during the extinction and subsequent re-ignition processes using planar laser-induced fluorescence (PLIF). The additives modify the flame recovery mode by affecting the competition between autoignition and edge-flame propagation. Doping with 160 ppm of NO can significantly enhance the re-ignition or hydrogen due to its catalytic effect, while H2O addition inhibits re-ignition because of its high specific heat and large third-body chaperon efficiency. In the flames considered here, direct numerical simulations are performed using a detailed H-2-air mechanism and are compared with experiments. The simulations show that a small amount of OH from NO-catalyzed reactions enhances autoignition in the extinguished region, whereas adding H2O inhibits re-ignition. Although flame propagation and extinction are largely unaffected by these additives, the induction time associated with the flame's recovery mode by autoignition is strongly affected. Hence, these additives can be used to control the recovery time following local extinction.
URI
https://scholarworks.unist.ac.kr/handle/201301/7372
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67649265302
DOI
10.1016/j.proci.2008.06.150
ISSN
1540-7489
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