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For the ultralean hydrogen/air and near lean-flammability limit methane/air flames, the sensitivity is noticeable but still small as compared to the extent of the strain rate variation.
Oxygen linewidths were treated empirically using the observed O2 coherence decay in spectra acquired from the product gases of lean, near-adiabatic H2/air flames stabilized on a Hencken flat-flame burner.
Those near London lean more on commuting and the capital's outgrowths.
Near the lean stability limit, H2O addition compresses heat release to shorten the elongated flame structure.
For premixed combustors operating near the lean stability limit, the flame is more susceptible to blowout, oscillation or flashback.
Near the lean blowout limit, long stable flames extending from the corner of the step are formed.
Flame behavior in the vessel near the lean flammability limit was observed with pressure histories, CCD camera images, and flame speeds measured by ionization probes.
However, once the oxygen mole fraction exceeds 0.60, the stable flame is obtained within a small equivalence ratio range near the lean extinction limit, and the stable range becomes narrower and narrower with increasing the oxygen mole fraction.
A distinct shift in the trends of evolution of LIF intensity and kernel perimeter is observed as the fuel concentration is varied near the lean flammability limit in CH4/air (ϕ = 0.35 0.65) and H2/air (ϕ = 0.05 0.31) mixtures.
