摘要
在模型燃烧室中通过变化合成气的成分比例研究不同燃料对点火时间和点火边界的影响。实验所用合成气由氢气、一氧化碳、甲烷、二氧化碳和氮气组成,热值范围 4.76-35.8MJ/m3,同时用甲烷作为对照组。实验中研究了不同来流空气流量、燃料组成对点火时间、点火范围的影响。结果表明随着氢气体积含量从0增加到20%时,点火时间会显著降低,点火范围扩大显著。当氢气含量超过50%时,实验条件下的空气流量对点火时间和点火下限的影响不再明显。与此同时,实验中检测到3种不同形态的后续火焰。接近点火下限的不稳定火焰；贫燃条件下的稳定火焰；富燃条件下表现为周期性的向上、下游传播的振荡火焰。通过分析上述结果得到了合成气随当量比和氢含量变化的点火工况图。
An experimental investigation on the influence of proportion of syngas constituents on ignition time and ignition limit was implemented in a model gas turbine combustor. The syngas used in the experiment consisted of hydrogen, carbon monoxide, methane, carbon dioxide, and nitrogen, and the heat value of the syngas was in a range of 4.76-35.8MJ/m3. The check experiment of methane ignition was carried out. The effect of inlet air flow and proportion of syngas constituents on ignition limit and ignition time was investigated systematically. The experimental results show that the ignition time shortens obviously, and the ignition limit is enlarged evidently when the hydrogen proportion is increased from 0 to 20%. When the proportion is over 50%, the influence of employed air flow on ignition time and ignition limit is no longer evident, thus, H2 is the most important factor. Meanwhile, three subsequent distinct flame patterns were observed. Unstable flames are near the lean ignition limits; stable flames are in the range of lean condition; and oscillated flames are in the rich condition as a form of periodically propagated flame. Finally, an ignition map was obtained.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第35期73-80,13,共8页
Proceedings of the CSEE
