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Premixed Carbon Monoxide-Nitrous Oxide-Hydrogen Flames: Measured and Calculated Burning Velocities With and Without Fe(CO)5.


pdf icon Premixed Carbon Monoxide-Nitrous Oxide-Hydrogen Flames: Measured and Calculated Burning Velocities With and Without Fe(CO)5. (214 K)
Linteris, G. T.; Rumminger, M. D.; Babushok, V. I.

NISTIR 6374; 39 p. October 1999.

Combustion and Flame, Vol. 120, No. 1/2, 58-75, 2000.

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
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Website: http://www.ntis.gov
Order number: PB2000-100436

Keywords:

carbon monoxide; chemical inhibition; flame chemistry; iron pentacarbonyl; nitrous oxides; promoters; propellants

Abstract:

The burning velocity of premixed carbon monoxide-nitrous oxide flames (background water levels of 5 to 15 ppm) has been determined experimentally for a range of fuel-oxidizer equivalence ratio phi from 0.6 to 3.2, with added nitrogen up to a mole fraction of XN2 = 0.25, and with hydrogen added up to XH2 = 0.005. Numerical modeling of the flames based on a recently developed kinetic mechanism predicts the burning velocity reasonably well, and indicates that the direct reaction of CO with N20 is the most important reaction for CO and N20 consumption for values of XH2 < 0.0014. The calculations show that a background H2 level of 10 ppm increases the burning velocity by only about 1% compared to the bone-dry case. Addition of iron pentacarbonyl, Fe(CO)5, a powerful flame inhibitor in hydrocarbon-air flames, increases the burning velocity of the CO-N20 flames significantly. The promotion is believed to be due to the iron-catalyzed gas-phase reaction of N20 with CO, via N20 + M = N2 + MO and CO+ MO = CO2 + M, where M is Fe, FeO, or FeOH.