Breakdown of surface burning of gas-permeable porous systems

Combustion characteristics of nanoaluminum, liquid water, and hydrogen peroxide mixtures

“…This anomalous burning phenomenon was observed not only in the quartz tubes, but also in wax paper tubes, where much of the walls are consumed near the luminous front, eliminating chances of confinement or pressure increases due to condensed phase product buildup. The change in the deflagration process has some indications of a transition between normal deflagration, or conduction-heat-transfer-dominated combustion, to convective burning, which is described as the breakdown of normal surface burning of a gas-permeable system as a result of penetration of combustion products into the reactant bed [34], or a deflagration wave whose propagation rate is controlled by convection via rapid penetration of hot gases [35]. However, there is one main characteristic of these mixtures that does not match previously reported conditions of convective burning of solid combustibles.…”

A New Approach for the Synthesis of 2,3,4а,6,7,8а,9,10-Octaaza-4,8-dioxo-3,4,4a,7,8,8а,9,9a,10,10а-decahydroanthracene and High-Energy Performance Characterization of Its Dinitramide Salt

“…To evaluate the catalytic or inhibitory effect of compound 4 on the burning rate of pyrotechnic compositions, we performed comparative tests on model compositions (wellknown pyrotechnic formulations exhibiting both low and high burning rates (u)) via the reported procedure [36]. The test results are shown in Figures 9 and 10.…”

Transition from Deflagration to Detonation in Granular Explosives

“…We have plotted in Figure 36 the high density date of Belyaev et al for l0-20P and 550P PETN. It is quite reasonable to Join the two sets of permeability data (i.e., Andreev and Chuiko (16) and Belyaev et al (7)) since the particle sizes are quite closely matched. The effect of particle size on B 0 can be easily seen from the more complete data in Appendix C. At very small particle size ("microcrystalline") such as 54, B. was independent of explosive composition at constant compaction (16).…”

“…The rate of conductive (linear) burning is less than I0 -4 mm/sec. Above a certain critical gas pressure in the ignition region, pore combustion commences (7). However, if the pressure in the ignition region is not maintained sufficiently long after the convective burning begins, it is conceivable that the convective front may cease to exist until adequately reinforced.…”