Spherical expanding flame in silane-hydrogen-nitrous oxide mixtures - Chemical Kinetics in Shock and Detonation Wave

Silane-based mixtures, such as silane-nitrous oxide blends, are mainly used in the semi-conductor industry to produce SiO2 solid layers and are also relevant to propulsion application. Most studies have used highly diluted mixtures and have focused on gas phase and particule growth kinetics. Although Horiguchi et al. have used non-diluted SiH4 -N2O mixtures to study the flammability limits, there is, to our knowledge, no data on the burning speed of silane-nitrous oxide based mixtures. In the present study, the effect of silane addition on the laminar burning speed of H2-N2O-Ar mixtures has been experimentally and numerically investigated. The dilution and the initial pressure were held constant at 60% of Ar and 50 kPa, respectively. The equivalence ratio was in the range 0.3-2.4 and the silane to hydrogen ratio ranged between 0 and 3. It was shown that the addition of silane results in a signi cant increase of the burning speed up to silane to hydrogen ratio of 1. The detailed kinetic model demonstrated overall agreement with the experimental results. The simulations also showed that the formation of condensed particules appears to play a signi cant role in the propagation of ames in silane-based mixtures.