Abstract: Twodimensional combustion flame front and temperature profiles of ultra lowcalorific gases in porous combustor are investigated numericallyThe characteristics of the flame front, high temperature profiles under certain operating parameters, and the flame propagation process are examinedThe effects of operating parameters, such as equivalence ratio, superficial velocity of gas and the wall heat loss, on the flame front and hightemperature zone are analyzedThe results show that the shape of the flame front is gradually changed in the propagation process of the flameAccordingly, this process results in the variation of the high temperature zoneAs the equivalence ratio increases, the inclination of the flame front near the wall decreases gradually, while the combustion flame propagates upstream graduallyThe shape of the flame front gradually changes from the trapezoid to the straightline distribution with downward inclination on both sidesThe effect of gas velocity on the shape and position of flame front is contrary to that of the equivalence ratioOn the other hand, the wallheat loss can lead to the inclination of the flame front near the combustor wall, while the effect on the position of flame is less.

Key words: foam ceramics, porous medium combustion, flame front, inclination

摘要： 对稀薄低热值气体在多孔介质燃烧中的二维火焰温度分布进行了数值模拟。在一定工况参数下，考察了多孔介质二维火焰峰面和温度分布特性，以及火焰峰面传播过程。详细分析了当量比、燃气流速、及壁面热损失等工况参数对燃烧火焰和高温峰值的影响。结果表明，在火焰传播过程中，火焰峰面形状逐渐变化，导致高温区域分布逐渐改变；随着当量比增加，近壁面处的火焰峰面倾斜程度逐渐减少，火焰峰面逐渐向上游传播，火焰峰面形状由梯形分布逐渐转变成两侧向下倾斜的直线分布；燃气流速对火焰峰面形状和位置的影响与当量比相反；壁面热损失引起火焰峰面倾斜，对火焰位置影响较小。

关键词: 泡沫陶瓷, 多孔介质燃烧, 火焰峰面, 倾斜