Combustion of a solid fuel particle in a pulsating flow

Summary

The increased burning rate of the fuel in PCC can be attributed to an increase in the flow over the particle; this probably also applies to a number of other combustion intensifiers.

An increase in the pulsations is especially effective with increase in fuel flow temperatures, when the diffusion regime goes over into the intermediate and possibly the kinetic regime, i.e., the burning rate reserves are realized.

As may be seen from the graphs, the flow puIsation effect (relative increase in burning rate as compared with combustion in a steady-state flow) increases with decrease in the constant velocity component; this obvious relationship does not apply to oscillating flow, when, as observations of the burning particle show, at small flow pulsations the particle is enveloped in a cloud of combustion products and its burning rate decreases.

The heat and mass transfer between the burning particle and the pulsating gas flow is determined by the aerodynamic characteristics of the flow and by diffusion processes and chemical reactions at the surface of the particle.