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利用OH-PLIF技术,研究了甲烷空气预混射流火焰,在不同出口雷诺数下,不同氮气稀释比例下火焰OH自由基的二维分布以及火焰的前锋面结构特性,以此实现对柔和燃烧的基础特性研究。实验结果显示,在获得大量氮气稀释后,预混火焰的OH浓度峰值减少了30%以上,并且整个燃烧反应明显延迟,但火焰面面密度没有发生明显变化。同时发现,改变出口雷诺数对火焰OH浓度影响较小,但是增加出口雷诺数可以扩大燃烧反应区。
The OH-PLIF technique was used to study the two-dimensional distribution of OH radicals and the front structure of the flame at different outlet Reynolds numbers of methane air premixed jet flame. Basic characteristics of the study. The experimental results show that after a large amount of nitrogen is diluted, the peak of OH concentration in the premixed flame is reduced by more than 30%, and the whole combustion reaction is obviously delayed, but the flame surface density does not change obviously. At the same time, it is found that changing the outlet Reynolds number has little effect on the flame OH concentration, but increasing the outlet Reynolds number can expand the combustion reaction zone.