炉壁散热率和烟气循环率对预混燃烧的影响  

Effect of Heat Extraction and the Exhaust Gas Recirculation Rate on the Premixed Combustion

作　　者：王飞飞[1] 米建春[1] 李鹏飞[1] 

机构地区：[1]湍流与复杂系统国家重点实验室(北京大学),北京市海淀区100871

出　　处：《中国电机工程学报》2011年第14期44-49,共6页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2007AA05Z3002);煤燃烧国家重点实验室开发基金项目(FSKLCC0801)~~

摘　　要：通过雷诺平均纳维叶斯托克斯模型(Reynolds averaged Navier-Stokes,RANS)数值模拟研究了反应物,在不同进口管径下,燃烧室内热量输出和烟气循环率对预混燃烧模式的影响。计算结果表明,燃烧室内的燃烧模式是由通过墙壁导出的热流率和内部烟气循环率共同决定的。通过分析发现,要在燃烧室内实现无焰燃烧,不仅需要高强度的烟气循环以稀释炉内的反应物浓度,进而减缓燃料的氧化反应,还应该加大燃烧室的换热速率以控制炉内的局部温度大小和炉内温度的均匀度。This paper reports a Reynolds averaged Navier-Stokes （RANS） modeling study that investigates the effects of heat extracted （Qout/Qin） through the furnace wall and the internal exhaust gas recirculation rate on the performance of premixed combustion. Results suggest that both the exhaust gas recirculation rate and the ratio Qout/Qin play important roles in establishing premixed tameless combustion. It is found that, to realize tameless combustion, not only a large exhaust gas recirculation rate is needed to dilute local fuel and oxygen concentration and to delay the fuel oxidation, but also a sufficiently high value of Qout/Qin is required to control the local peak and the uniformity of temperature field inside the chamber.

关 键 词：无焰燃烧 数值计算 烟气循环率 散热速率 

分 类 号：O362[理学—流体力学]