Nature of and laws governing quasi-steady-state pulsed convective combustion

Reaction propagation modes in millimeter-scale tubes for ethylene/oxygen mixtures

“…Babkin et al [21] studied the propagation of premixed gaseous flames in porous media with pore size at 3-4 mm, and as many as five different propagation modes were found. Similar to gaseous systems, convective burning [22] and pulsating reaction wave propagation modes [23] are also observed in pores and gaps/cracks of energetic materials. The fast reactive waves propagating through the connected pores of solid energetic materials, which are filled with gaseous decomposition products during ignition, has been considered to be resembling the gaseous reaction wave propagation process in small tubes [24].…”

An elementary model for the transition from conductive to penetrative burning in gas-permeable explosives

“…5) gives grounds for the belief that the reduced model (for all its simplicity) yields a qualitatively adequate picture of the real-world dynamics. Moreover, the model seems also rich enough to cover the oscillatory burning, often occurring upon the transition [16,25]. For gaseous systems and overpressure-enhanced burning, the effect has recently been discussed in Refs.…”

On Oscillatory Instability in Convective Burning of Gas-Permeable Explosives

“…There are also alternative possibilities for the oscillatory burning worth examining. According to some observations the oscillatory burning is prone to occur in flexible tubes, being suppressed under rigid confinement [9,10]. Indeed, it is well known that flexibility of the boundary may exert a destabilizing influence on confined flows [5].…”

“…This paper is concerned with the oscillatory instability often observed in high-velocity convective burning of gas-permeable solid explosives [1,2,4,9,10]. In convective burning preheating of the porous charge is effected by convective transport of hot gases driven by the developing pressure gradients.…”