CRITICAL PHENOMENA IN THE COMBUSTION OF CONDENSED SUBSTANCES

It is suggested that the burning surface of condensed substances in no nstationary combustion be considered as a one-dimensional disordered s ystem of hot spots. The properties of such systems can be described in terms of percolation theory. Variations in the electrical conductivit y of the condensed-phase reaction of pure and modified ammonium perchl orate are analyzed for the case of oscillatory combustion. A method is proposed for calculating the burning rate under fast depressurization from data on electrical conductivity. It is shown that under critical conditions a universal dependence of critical parameters on adiabatic burning rate is observed.