Abstract
The three-dimensional flow field and two-dimensional coal combustion in a cylindrical combustor of co-flow jets with large velocity difference are studied by numerical simulation. Prediction results show presence of a large central recirculation zone and its remarkable effect on rapid heating, devolatilization and ignition of coal particles, flame stabilization and combustion intensification. For optimum design of such combustors the effect of jet hole location and jet flow rate on sizes and reverse flow rate of this recirculation zone are also studied.
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