Abstract
A direct numerical simulation (DNS) is applied to a laboratory scale pulverized coal jet flame. Pulverized coal particles are injected with primary air in the double stream burner and the effects of equivalent ratio in the primary stream on the coal jet flame are investigated. In the DNS, the number of grid is about 0.17 billion, and the coal particle motions are tracked by a Lagrangian approach. The results show that the gas temperature of the flame annularly formed downstream the burner increases as the equivalent ratio increases. While, the spatial distribution of the gas temperature inside the flame becomes uniform under the low equivalence ratio condition.
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