湿空气非预混火焰的稳定性  

Flame Stability in Humid Air Non-Premixed Flame

作　　者：顾欣[1] 臧述升[1] 葛冰[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030

出　　处：《燃烧科学与技术》2007年第4期320-324,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(G1999022303)

摘　　要：利用粒子图像测速技术对钝体后的湿空气回流非预混燃烧火焰流场进行了测量，研究湿空气燃烧火焰的结构特性，以及水蒸气的加入对火焰稳定性的影响，得到湿空气燃烧火焰的稳定性区域图．通过对比湿空气燃烧和普通燃烧火焰转变的临界值，发现湿空气燃烧回流火焰向过渡火焰转变时，燃空速度比的临界值比普通燃烧的低16％-22％，而发生局部熄火时的临界值与普通燃烧时的相比至少低25％．分析表明，湿空气火焰不稳定性主要是由于环流湿空气动量的减少引起的，另外稀释作用和化学发应的影响导致氧原子含量降低也是不稳定的一个原因．Two-dimensional velocity fields were measured quantitatively using particle image velocimetry （PIV） in the humid air non-premixed recirculafing combustion on a bluff-body burner in order to study the effect on flame stability with steam added. The characteristic flame modes and velocity field structures in the humid air combustion were experimentally investigated and detailed stabilization regimes diagrams were proposed. The comparison of the stabilization regimes shows that the critical fuel-to-air velocity ratios of the fuel penetration condition in the humid air case are 16% - 22% lower than that of conventional non-humid air ease, and the partially quenching limits in the humid air flame are at least 25 % lower. The main reasons for unstable humid air flame are due to the reductions of the humid air momentum and the decrease of the O-atom concentration due to dilution and chemical reaction.

关 键 词：湿空气燃烧 非预混燃烧 火焰稳定性 火焰结构 

分 类 号：TK16[动力工程及工程热物理—热能工程] O357.5[理学—流体力学]