瓦斯燃烧器回流区数值模拟研究

NUMERICAL SIMULATION ON THE DIMENSION OF THE BACKFLOW REGION IN A GAS BURNER

采用k ε湍流模型、三气体扩散燃烧模型和综合辐射模型 ,利用PHOENICS软件对瓦斯燃烧器湍流扩散火焰中心回流区进行了较详细的数值计算。计算结果表明 ,在强旋流条件下 ,回流区尺寸随旋流数增加而增大 ,受风压和热负荷影响较小。可以适当增加助燃空气压力来提高燃烧强度 ,调节燃烧负荷来适应加热要求 。

The k ε turbulent model, the three gase mixing combustion model and the composite radiosity model are used to simulate numerically the central backflow region of the turbulent diffusion flame in a gas burner with the PHOENICS software. The result of the numerical simulation shows that the dimension of the backflow region increases with the swirl number increasing when the swirl number is large enough, but it has no great changes under different air pressures and different loads. Combustion intensity may be improved by properly increasing the air pressure, and combustion load can be adjusted according heating demands. With swirl number getting larger, the gas burner can work more stably.