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  • 1
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    Modelling ignition characteristics of rich H2/O2 mixture in a monolithic catalytic reactor (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ignition of rich hydrogen-oxygen mixture in a monolithic catalytic reactor is studied using a transient combustion model. The model assumes a quasi-steady gas phase and a thermally-thin substrate. The ignition time lag is due to the thermal inertia of the substrate. One-step global chemical reaction is assumed both on the surface and in the gas phase. An effectiveness factor is introduced to account for the transition from a kinetically-limited catalytic surface reaction to a diffusion-limit one during ignition. Results presented include a catalytic ignition boundary, ignition delay time and the transient response in the catalytic bed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 88-3224
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Size and shape of solid fuel diffusion flames in very slow speed flows (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The influence of very low speed forced flows on the size and shape of a diffusion flame adjacent to a solid fuel slab is studied experimentally and theoretically. Velocities in the range of 1.5 to 6.3 cm/s and O2 mole fractions (in the O2/N2 atmosphere) in the range of 0.15 to 0.19 were tested. The flames moved farther from the fuel surface as the flow velocity was reduced and closer to the sample as the O2 concentration was lowered. A corresponding theoretical model was solved using a two-dimensional Navier-Stokes system with a one-step finite-rate chemical reaction and surface radiative loss.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 87-2030
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Near-Limit Flame Spread over a Thin Solid Fuel in Microgravity (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Diffusion flame spread over a thin solid fuel in quiescent and slowly moving atmospheres is studied in microgravity. The flame behavior is observed to depend strongly on the magnitude of the relative velocity between the flame and the atmosphere. In particular, a low velocity quenching limit is found to exist in low oxgen environments. Using both the microgravity results and previously published data at high opposed-flow velocities, the flame spread behavior is examined over a wide velocity range. A flammability map using molar oxygen percentages and characteristic relative velocities as coordinates is constructed. Trends of flame spread rate are determined and mechanisms for flame extinction are discussed.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: E-8357 , Symposium (International) on Combustion; Aug 14, 1988 - Aug 19, 1988; Seattle, WA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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