Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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A Study on Laminar Lifted Jet Flames for Diluted Methane in Co-flow Air

  • Sapkal, Narayan P. (Department of Mechanical Engineering, Pukyong National University) ;
  • Lee, Won June (Interdisciplinary Program of Biomedical Engineering, Pukyong National University) ;
  • Park, Jeong (Department of Mechanical Engineering, Pukyong National University) ;
  • Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2015.05.13
  • Accepted : 2015.06.22
  • Published : 2015.09.30
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Abstract

The laminar lifted jet flames for methane diluted with helium and nitrogen in co-flow air have been investigated experimentally. Such jet flames could be lifted in both buoyancy-dominated and jet momentum dominated regimes (even at nozzle exit velocities much higher than stoichiometric laminar flame speed) despite the Schmidt number less than unity. Chemiluminescence intensities of $OH^*$ radical (good indicators of heat release rate) and the radius of curvature for tri-brachial flame were measured using an intensified charge coupled device (ICCD) camera and digital video camera at various conditions. It was shown that, an increase in $OH^*$ concentration causes increase of edge flame speed via enhanced chemical reaction in buoyancy dominated regime. In jet momentum dominated regime, an increase in radius of curvature in addition to the increased $OH^*$ concentration stabilizes such lifted flames. Stabilization of such lifted flames is discussed based on the stabilization mechanism.

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References

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