Combustion in porous media, or filtration gas combustion, is a typical example of combustion with heat recirculation. It contains complex heat transfer mechanisms which induce various dynamic combustion behaviors due to the combination of excess enthalpy and nonlinear nature of reaction fronts. It can be regarded as a simplified fluidized bed combustion and fundamental system of packed bed reactor as well as catalytic packed bed.

We are trying to examine general characteristics of combustion in porous media. So far, two different velocity regimes of stabilized flame location were identified as extensively known. Besides them, low frequency pulsation, split, self-blinking and helically creeping flames were identified experimentally. By taking the advantage of high-thermal coupling in porous media, its application to microcombustion is also promising.

Splited flame in porous media

Inclined flame in porous media