Change in the parameters of surface thermal decomposition of energy-intensive materials near the phase-state boundary

Necessary conditions of attainable superheating of the surface of nonvolatile condensed systems under intense heating

“…(6) in terms of the mean reaction rate which defines the decrease in mass to derive , where s is a coefficient, and δ is the thickness of the zone of decomposition. Hence we find the velocity of motion of the decomposition front [10], .…”

“…(10) and (11) to determine the correlation between the velocities in the steady-state slow mode of combustion, with the inequality u T ≥ u being the condition of stability of this combustion mode. For this purpose, we will substitute the value of δ = f ′δ T into Eq.…”

“…We will further compare the values of heating rate observed under real conditions of heating some CSs to calculated values of the heating rate which are required to reach the LPS. In order to calculate the mean rate of heating a CS, we will use the available literature data on the registration of temperature fields in the surface zone of burning [10][11][12][13]. The results of calculation by formula (22) for nitrocellulose gunpowder, AP, and PMMA are given in Table 1.…”

“…The "heat flux" method of Frank-Kamenetskii makes it possible to separately determine the heat wave velocity u T and the velocity u [5,10]. The heat wave velocity is related to the mean velocity w T of the reaction of thermal decomposition in the surface layer proceeding with liberation of heat, .…”

“…Figure 1 gives the dependences Q(T) for two materials with the characteristics borrowed from [10][11][12][13][14]. The following parameters were preassigned: for the first material (nitrocellulose gunpow- The AP characteristics were determined by the method of linear pyrolysis assuming that f = 0.64 [7].…”