【摘要】 采用Fluent软件的大涡模拟（Large Eddy Simulation，LES）方法，对3种旋流非预混低NO_x燃烧器进行数值模拟，分析它们的温度、速度场和污染物排放特性，探讨燃烧器结构对涡旋与火焰相互作用的影响。研究结果表明，旋流内置结构和旋流文丘里结构能有效降低燃烧温度，最高温度降幅可达300 K；超低NO_x燃烧器的NO_x生成主要集中在炉膛中下游区域。与常规旋流结构相比，旋流文丘里结构和旋流内置结构的NO_x排放量分别降低了13.77%和12.32%，其中旋流内置结构的NO_x排放量最低为11.9 mg·kg^-1。在炉膛出口处，旋流内置结构的碳烟排放量较常规结构降低了5.56%，降至20.4 mg·kg^-1，而旋流文丘里结构的碳烟排放量则上升了18.06%，表现不佳。更多还原

【Abstract】 By using the Large Eddy Simulation （LES） method of Fluent software,three kinds of swirl unpremixed low-nox burners are numerically simulated,their temperature,velocity field and pollutant emission characteristics are analyzed,and the influence of burner structure on the interaction between vortex and flame is discussed.The results show that the inner swirl structure and swirl Venturi structure can effectively reduce the combustion temperature,and the maximum temperature reduction can reach 300 K.The NO_x generation of ultra-low NO_x burners is mainly concentrated in the middle and lower reaches of the furnace.Compared with conventional swirl structure,the NO_x emission of swirl Venturi structure and swirl internal structure is reduced by 13.77% and 12.32%,respectively,and the lowest NO_x emission of swirl internal structure is 11.9 mg·kg^-1.At the outlet of the furnace,Soot emission of swirl built-in structure decreased by 5.56% compared with that of conventional structure to20.4 mg·kg^-1,while Soot emission of swirl Venturi structure increased by 18.06%,which showed a poor performance.更多还原