ODPP/OESC旋流火焰的试验与模拟研究

Experiment and Simulation of ODPP/OESC Swirl Flame

中文关键词: 旋流火焰  稀氧部分预混/富氧补燃  反应速率  氮氧化物

英文关键词: swirl flame  ODPP/OESC  reaction rate  nitrogen oxides

中文摘要:

      利用三维旋流燃烧系统，对稀氧部分预混/富氧补燃（ODPP/OESC）火焰结构和污染物生成特性进行了试验研究，降低稀氧浓度、提高富氧浓度，动力火焰呈现轴向拉伸趋势，而扩散火焰长度则逐渐缩短；同时，动力燃烧区和扩散燃烧区温度逐渐降低，NOX排放量显著下降，CO排放量则有所提高。相同工况下数值模拟结果显示，ODPP/OESC改变了动力燃烧区的NO生成机理，是NO排放量降低的根本原因。ODPP/OESC基于燃料/氧化剂空间浓度分布的物理过程控制，有效均衡了动力燃烧区与扩散燃烧区的反应速率，可实现CO与NOX排放的平衡控制。

英文摘要:

      A three-dimensional swirl experimental diagnostic system was constructed. The flame structure and emission characteristics of oxygen diluted partially premixed/oxygen enriched supplemented combustion (ODPP/OESC) were explored. With the decreasing of oxygen-diluted concentration and increasing of oxygen-enriched concentration, dynamic flame is elongated in axial and diffusion flame is gradually shortened, with both decreased temperature. Meanwhile NOX emission is reduced a lot while CO emission is increased. The simulation results with the same conditions show that ODPP/OESC changes the NO formation mechanism, which is the main cause for lower NO emission. By controlling the physical process of the fuel/oxidant concentration distribution of ODPP/OESC, the reaction rate of dynamic flame and diffusion flame could be balanced and CO/NOX emissions could be controlled.