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NO concentrations in laminar premixed CH4/O2/N2 flames with varying equivalence ratio


Number density and concentration of nitric oxide have been investigated in laminar premixed CH4/O2/N2 flames using laser-induced fluorescence technique. Emphasis was placed on quantitative measurements, which were taken in flames at various equivalence ratios ranging from 0.9 ∼ 3.0. The flow rate was fixed at 2 SLPM. The NO A-X (0,0) vibrational band around 226 nm was excited using a XeCl excimer-pumped dye laser. By selecting an appropriate NO transition, the interferences from elastic scattering and O2 fluorescence were minimized. Results show that the maximum NO concentration increased at the range of equivalence ratio from ϕ = 0.9 to 1.6, decreased from ϕ = 1.6 to 2.0 and slowly increased with increasing equivalence ratio above ϕ = 2.0. Also, the maximum NO concentration was at around the reaction zone.

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Corresponding author

Correspondence to Kyoung-Suk Park.

Additional information

Recommended by Editor Oh Chae Kwon

Seong-Ho Jin received his Ph.D. degree from Kyung Hee University, Korea in 1999. Dr. Jin is currently a Senior Lecturer in the School of Engineering at University of Lincoln, UK. His research interests include combustion, laserbased combustion diagnostics and its application to internal combustion engine and gas turbine.

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Jin, SH., Shim, BJ., Kim, SW. et al. NO concentrations in laminar premixed CH4/O2/N2 flames with varying equivalence ratio. J Mech Sci Technol 27, 2209–2215 (2013).

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  • Nitric oxide (NO)
  • Laser-induced fluorescence (LIF)
  • Laminar premixed flame
  • Equivalence ratio