Cavity ring-down measurements of seeded NO in premixed atmospheric-pressure H2/air and CH4/air flames

Pressure dependence of NO formation in laminar fuel-rich premixed CH4/air flames

“…The profiles of CH mole fraction were determined only in the 40 and 75 Torr flames. The quenching rates at these pressures were determined from the temporal LIF-signal using the numerical procedure described in [18]. Since, at pressures above 100 Torr, the fluorescence lifetimes are comparable to or shorter than the time resolution of the detection system, the quenching rates at the flames at 300, 500, and 760 Torr were calculated based on the com- position obtained from the CHEMKIN calculations and using published cross sections from [19].…”

Formation and consumption of NO in H2+O2+N2 flames doped with NO or NH3 at atmospheric pressure

“…One can conclude that experimental data on the flame structure of rich hydrogen flames doped with NH 3 at atmospheric pressure are still not available. Contradicting findings of Cattolica et al [15] and of Seery and Zabelski [16] as well as unexpected behavior of NO reburning in H 2 + O 2 + N 2 flames [19] calls for detailed investigation of the flame structure of hydrogen flames seeded with NO at atmospheric pressure. The goal of the present work was, therefore, to study formation and consumption of NO in lean, near-stoichiometric and rich H 2 + O 2 + N 2 flames doped with 0.03-0.1% of NO or NH 3 using molecular-beam mass-spectrometry.…”

“…NO reburning in H 2 + O 2 + N 2 flames at atmospheric pressure was only studied by Sepman et al [19] using cavity ring-down absorption spectroscopy (CRDS) and LIF. The flame temperature was varied at fixed equivalence ratios (/ = 0.6, 0.8, and 1.0) by changing the flow rate of the unburned mixture containing 200 ppm of NO.…”

Quantitative Fourier Transform Infrared Diagnostics of the Gas-Phase Composition Using the HITRAN Database and the Equivalent Width of the Spectral Features

“…In usual absorption measurements, the contribution of the transitions lying outside the boundaries can be regarded as (part of) the background. 14 In FT-IR measurements this procedure is, however, not that straightforward due to the oscillations in the spectra. One way to approach this problem is to calculate the integral on the right side of Eq.…”