Abstract
The effects of the velocity gradient and nonadiabaticity on the extinction of premixed counterflow low-pressure flames were studied using saturated laser-induced fluorescence of OH radicals. The temperature and OH concentration were determined at a stagnation point for different opposed flow velocities in nonadiabatic and near-adiabatic methane-oxygen-nitrogen flames in the range of equivalence ratio 0.6–1.2. The temperature and OH concentration profiles were measured in twin flames far from and close to extinction. Temperatures at the stagnation point vary with heat losses and velocity gradient, while OH concentrations depend mainly on velocity gradient. Spatial gradients of temperature or OH concentration profiles in twin flames are insensitive to velocity gradient and heat losses. The implication of these results for the correctness of probe sampling and mass-spectrometric analysis in low-pressure flat flames is discussed.
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