Numerical Study of the Ignition of Silane/Hydrogen Mixtures

The use of silane, SiH4, as an ignition improver for hydrogen/air (H2/O2) mixtures, has been evaluated numerically, using a chemical mechanism constructed by analogy with methane low-temperature oxidation kinetics. The mechanism rate parameters are redefined by comparing numerical results with data from shock-tube experiments. The computer results reveal that over entire temperature and pressure ranges examined, substantial reduction in ignition delays has been confirmed when SiH4 is added to H2. It is shown that the H2/O2 ignition anomaly, known as the extended second explosion limit, is essentially degenerated in the presence of SiH 4.

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