NUMERICAL-SIMULATION OF COMBUSTION AND IGNITION-QUENCHING BEHAVIOR OFA CARBON PACKED-BED

A two-dimensional axisymmetrical numerical model for combustion of a c arbon packed bed is presented. The model is set up by coupling a gas-p article two-phase flow inside the bed to a stagnation point flow in th e boundary layer on the bed surface. The PISO algorithm is employed fo r the solution. Computations have been performed for the two limiting cases of a Frozen and of an equilibrium flow as well as for finite hom ogeneous reactions rates. The combustion rates of the packing for vari ous parameters and the parameter distribution profiles are obtained. T he ignition and quenching behaviour of the packing is also investigate d and discussed. The model is useful for the simulation of the smolder ing combustion and its transition into flaming.