Numerical Simulation in a Non-Premixed Gas Burner

摘要

Burners have a wide range of applications in civil, industrial and military fields. Their structures and performances have a direct and significant impact on the processes of heat generation and heat exchange as well as pollutant generation in the furnace. At present, researchers mainly control the flame shape and emission characteristics by changing the geometry and operating parameter of the burner. In this paper, dealing with the non-premixed burner, the Realizable k-ε turbulence model and the Eddy Dissipation Model (EDM) combustion model are combined with the Discrete Ordinates (DO) radiation model to simulate certain burners which base on the different inner air duct position. It’s revealed that the variation of the air flow rate of each level is not obvious when the inner air duct moved toward the exit of the furnace. When the inner air duct moves away from the outlet of the furnace, the air flow rate of each level varies greatly compared with the original model. When inner air duct is moved toward the furnace exit, the flow velocity in the central recirculation zone is increased, and the size of flame is shortened. When inner air duct is moved away from the furnace exit, the flow velocity in the recirculation zone is not much different from the original model. But in term of the effect of "concentration", it is worse than the original burner.