A numerical study of silane combustion
A kinetic model of the mechanism of silane combustion has been developed, using a system of 70 elementary reaction steps and 25 chemical species. The model was used to examine silane ignition at ordinary pressures under both shock tube conditions and low-temperature constant-volume conditions. The agreement between model predictions and experimental data is very good, both with respect to shock tube ignition delay times and to the pronounced, nonlinear variation of autoignition time with initial pressure at near-ambient temperatures. The model also reproduces observed trends in H{sub 2}/H{sub 2}O product yield as a function of the initial SiH{sub 4}/O{sub 2} ratio. One key to this mechanism is competition between thermal stabilization and chain-branching decomposition reactions of an excited-state silylperoxy radical, and a second key is the reaction of water vapor with intermediate species containing a Si{double bond}O double bond. 27 refs., 4 figs., 2 tabs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7170244
- Report Number(s):
- UCRL-102584; CONF-900704--4; ON: DE90006002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTIONS
COMBUSTION
DISPERSIONS
ELEMENTS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
IGNITION
MATHEMATICAL MODELS
MIXTURES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
REACTION INTERMEDIATES
SILANES
SILICON COMPOUNDS
THERMOCHEMICAL PROCESSES
WATER
YIELDS