一种新的火焰稳定机制(英文)  

A New Mechanism of Flame Stabilization

作　　者：钱壬章[1] 邬田华[1] 靳世平[1] 杜一庆[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《燃烧科学与技术》2011年第6期483-490,共8页Journal of Combustion Science and Technology

摘　　要：传统的钝体稳焰机制以高温烟气的回流预热初始燃料,促使着火提前,强化燃烧,达到稳定火焰的目的.这种钝体稳焰机制并未将回流区所具备的全部功能都发挥出来.本文提出的开缝钝体燃烧机制,即在钝体中心设置缝隙,向回流区送入少量燃料与空气,使其在最有利的环境中立即着火,形成一值班火焰,以明火点燃主流.这样,回流区的"被动热源"将转变成"主动热源",从而大大增强了回流区对主流的稳焰效果.本文还对开缝钝体燃烧器的燃烧机制和实验结果进行了讨论.For the mechanism of the existing flame stabilization in combustion using bluff-body burners, the initial flow of fuel was preheated by the recirculation of high temperature flue gas so as to introduce earlier ignition and enhance combustion, and thus the flame was stabilized. However, in that case some functions existing in the recirculation region were not yet exerted. A new mechanism of combustion using slitted bluff-body burners is proposed in this study. The main idea is to cut a slit at the center of the bluff-body and deliver small amount of fuel and air to the recirculation region so as to ignite it in the most favorable environment to form a pilot flame, which in turn ignites the main stream by naked flame. As a result, the passive heat source of the recirculation region is changed into the active heat source, and the effect of flame stabilization on the main stream region exerted by the recirculation region is greatly increased. In this paper, the mechanism of combustion using slitted bluff-body burners and the related experimental results are discussed.

关 键 词：燃烧机理 火焰稳定 回流区 开缝钝体 

分 类 号：TK16[动力工程及工程热物理—热能工程]