S. Zhdanok et al., SUPERADIABATIC COMBUSTION OF METHANE AIR MIXTURES UNDER FILTRATION INA PACKED-BED, Combustion and flame, 100(1-2), 1995, pp. 221-231
Filtration combustion in porous media differs substantially from combu
stion in a homogeneous media. The difference is the heat transfer betw
een the filtrated gas and the porous medium under conditions of active
heat transfer over a highly developed internal solid surface. The rea
ctive transfer is characterized by a thermal wave velocity that determ
ines the velocity of heat accumulation in a porous medium due to the f
iltrated flow and by a reaction wave velocity. A resonance condition c
an occur when both velocities nearly coincide and the heat of reaction
becomes localized in a moving thermal wave. A temperature can be reac
hed much in excess of the adiabatic reaction temperature and thus self
-propagating reactions are possible even in a weakly exothermic medium
. The propagation of the localized resonance wave and the superadiabat
ic reaction effect is confirmed by experiments and the results of a si
mple mathematical analysis. The model is compared with predictions for
the thermal and combustion wave speeds and demonstrates good agreemen
t.