Nitric Oxide Formation from Fuel and Atmospheric Nitrogen

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Abstract
—Atmospheric and subatmospheric pressure CH4/air and C3H8/air flames stabilized on a flat flame burner at equivalence ratios of 0.8 and 1.25 were probed for profiles of temperature and stable reaction products. Via the Fristrom and Westenberg (1965) technique, these data were converted to local reaction rates for comparison with predictions of the H2/O2 (Thompson et al., 1972) partial equilibrium method. Thermal NO formation rates calculated from the H2/O2 method gave good agreement after the flame zone with the experimental rates. Profiles in the rich flames show that the region of rapid NO formation (associated with Fenimore's “prompt” NO) occurs approximately 2 mm behind the visible flame.