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为了解液体燃料在微小空间中的熄火和火焰传播特性,采用不同的外套管和多孔介质,在微细直管中对庚烷扩散火焰进行了实验研究。研究结果表明:随着庚烷流量的增加,火焰稳定位置逐渐向直管燃烧器出口移动,可燃极限先迅速增大又趋于不变。增加外套管可以有效扩展可燃极限,外套管的结构对火焰稳定性和可燃极限有很大影响。外套管层数越多,燃烧器散热量越小,火焰稳定性越好。此外,多孔介质的位置对火焰稳定性也有很大影响。庚烷喷嘴放置在多孔介质上游及多孔介质中时,液体庚烷的蒸发以及混合效果最好,可以得到更好的富燃极限。
In order to understand the flameout and flame propagation characteristics of liquid fuels in a small space, different outer sheaths and porous media were used to study the diffusion of heptane in fine straight tubes. The results show that with the increase of heptane flow rate, the stable position of flame gradually moves to the outlet of the straight tube burner, and the combustible limit firstly increases rapidly and remains unchanged. Increasing the outer casing can effectively expand the flammability limit, and the structure of the outer casing has a great influence on flame stability and flammability limit. The more jacket layers, the smaller the burner heat dissipation, the better flame stability. In addition, the location of porous media also has a great influence on flame stability. Heptane nozzles placed in the porous medium upstream and porous medium, the liquid heptane evaporation and mixing of the best, you can get a better fuel rich limit.