The decomposition flame of hydrazine in inert porous media

Abstract

The propagation of thermal waves of N 2H 4 decomposition in capillary-porous media of two types has been studied with filtrational supply of the reactant to the decomposition zone. Steady-state decomposition regions have been examined. Parameters affecting the burning velocity and thermal wave propagation velocity have been determined. Thermal wave structure has been found to involve an anomalously wide preheat zone, due to the effect of capillarity. In this zone hydrazine appears in both liquid and gaseous states, the liquid and gaseous mass flows being, in fact, non-one-dimensional. The decomposition process causes internal capillary filtration. A physical model of decomposition flame hydrazone in porous media is discussed. The decomposition flame laws and peculiarities have been shown to depend on the properties of both the monofuel and the porous medium. Filtrational flows induced by external and internal (capillary) forces, as well as thermal interaction between porous and reaction media, have been shown to play an important role in the mechanism of wave propagation.