瓦斯燃烧器火焰回流区的数值分析  

Numerical Simulation of Flame Circumfluence of a Gas Burner

作　　者：张奕[1] 陈丹丹[1] 石嵩[1] 李静[1] 腾跃[1] 

机构地区：[1]南京师范大学能源与机械工程学院,江苏南京210042

出　　处：《南京师范大学学报（工程技术版）》2011年第4期24-28,共5页Journal of Nanjing Normal University(Engineering and Technology Edition)

摘　　要：对一种瓦斯燃烧器的火焰流场进行了数值计算,根据计算结果对火焰回流区进行了分析.针对瓦斯燃烧器的结构特点,将燃烧区域的流动简化为二维轴对称流动.对不同空气和瓦斯流速时的计算结果表明,火焰中心及两排空气引射管间出现回流区,火焰中心的回流区占主要地位.空气流速越高,回流区越大,但回流区距燃烧器出口越近,甚至进入燃烧器.瓦斯流速对火焰回流区的作用规律与空气相反,瓦斯流速较高时,中心回流区将显著变小,距燃烧器出口距离较远,两排空气引射管间的回流区消失.计算结果可为瓦斯燃烧器选用适当的空气和瓦斯流速提供依据.The flame flow field of a gas burner was investigated by numerical method. The flame circumfluence was ana- lyzed with calculation results. The flow was simplified into two dimensional axisymmetric flow according to characters of gas burner structure. Numerical simulations were performed with different velocities of air and gas. Results showed that there were two cireumfluences in flow area. One was at the centre of flow area, the other was between two jets of air. The higher the air speed was, the wider flame circumfluence was. And the eircumfluenee was nearer to outlet of the burner, even entered into the burner when air velocity got higher. The impact of gas velocity on the circumfluence was opposite to that of air velocity. When gas flowed at a relative high velocity, the eircumfluenee at the centre became obvi- ously smaller and was rarer away from the outlet. This study can provide guidance for choice of appropriate velocity of air and gas in gas burner.

关 键 词：瓦斯燃烧器 火焰回流 火焰稳定性 数值计算 

分 类 号：TK114[动力工程及工程热物理—热能工程]