Two-dimensional modes of filtration combustion

A theoretical analysis is made of the possible modes of filtration combustion and the transitions between modes with changing system parameters are studied. The “initial pressure-filtration coefficient” plane is subdivided into regions where the various modes exist. It is shown that at superstoichiometric initial pressures, when there is enough gas in the pores for complete transformation of the solid reagent, there is a range of parameters where combustion proceeds in a surface mode. At still higher initial pressures a new, bimodal, combustion regime is observed, which combines the features of the layer-by-layer and surface modes.