Hydrogen/nitrous oxide kinetics -- Implications of the N{sub x}H{sub y} species

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(97)00128-4· OSTI ID:619580

Allen, M T; Yetter, R A; Dryer, F L ^[1]

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1. Princeton Univ., NJ (United States)

Nitrous oxide, hydrogen, and species containing NH bonds (such as NH{sub 3}, NH{sub 2}, and NH) actively participate in the gas-phase chemistry above burning solid propellants. Dilute mixtures of hydrogen and nitrous oxide in nitrogen were studied in a large-diameter flow reactor at 3 atm and 995 K. The consumption of H{sub 2} and N{sub 2}O as well as the formation of H{sub 2}O and the intermediate species profiles of NH{sub 3} and NO were all measured experimentally. A detailed chemical mechanism is developed and compared with the experimental measurements. From knowledge of the NH{sub 3} and NO intermediate species profiles, results are presented which indicate that N{sub 2}H{sub x} and NH{sub x} species and reactions are necessary to predict the overall reaction rate of pure H{sub 2}/N{sub 2}O/N{sub 2} mixtures at these temperatures. Numerical predictions without this chemistry can be too fast by as much as a factor of 2. Experiments were also conducted with quantities of NO and NH{sub 3} added to the initial mixtures in order to investigate the inhibitory strengths of these species and to further constrain the model validation. Based on these parametric studies, an estimate is given for the rate constant of NO + H + M = HNO + M with nitrogen as the collision partner.

• OSTI ID: 619580
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 112; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
AMMONIA
CHEMICAL EXPLOSIVES
COMBUSTION KINETICS
HYDROGEN
NITRIC OXIDE
NITROUS OXIDE
WATER VAPOR