PROPAGATION OF COMBUSTION OVER COMPOSITES BASED ON POROUS SILICON AND SODIUM-PERCHLORATE MONOHYDRATE

Results of experiments with energy-saturated composites, including those based on fragmented nanostructured silicon (FPS composites), have been presented. It has been established that the process of combustion of FPS composites is multistage, the phase that follows develops irrespective of the preceding one with stepwise increase in the released energy and growth in the velocity of propagation. It has been shown that despite the problems of propagation of an aerosol regime with the defi ciency of free water (at the humidity W = 0.7%, the delay time is 75 μs), after the coalescence of the combustion front with the source of a burning aerosol (frontal aerosol regime of combustion), this factor plays no role against the background of sharp increase in the energy release. A study has been made of the combustion of FPS composites in inert media (He, Ar, and Kr). It has been established that the durations of smoldering and frontal regimes (phases) of combustion in helium and argon are similar and in inert gases, there is no phase of aerosol combustion observed in the atmosphere, which points to its dependence on the oxygen of the external medium. Maximum rates of frontal-aerosol combustion are nearly the same in all the gases. This demonstrates the weak infl uence of the medium′s physical parameters on the behavior of the composites in the most energy-saturated phase of chemical transformation
Results of experiments with energy-saturated composites, including those based on fragmented nanostructured silicon (FPS composites), have been presented. It has been established that the process of combustion of FPS composites is multistage, the phase that follows develops irrespective of the preceding one with stepwise increase in the released energy and growth in the velocity of propagation. It has been shown that despite the problems of propagation of an aerosol regime with the defi ciency of free water (at the humidity W = 0.7%, the delay time is 75 μs), after the coalescence of the combustion front with the source of a burning aerosol (frontal aerosol regime of combustion), this factor plays no role against the background of sharp increase in the energy release. A study has been made of the combustion of FPS composites in inert media (He, Ar, and Kr). It has been established that the durations of smoldering and frontal regimes (phases) of combustion in helium and argon are similar and in inert gases, there is no phase of aerosol combustion observed in the atmosphere, which points to its dependence on the oxygen of the external medium. Maximum rates of frontal-aerosol combustion are nearly the same in all the gases. This demonstrates the weak infl uence of the medium′s physical parameters on the behavior of the composites in the most energy-saturated phase of chemical transformation
Author:  V. N. Mironov, E. S. Golomako, P. N. Krivosheyev, O. G. Penyazkov, S. O. Shumlyaev
Keywords:  FPS composites, sodium-perchlorate monohydrate, induction period, combustion phases, frontal aerosol regime
Page:  1805