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本文实验研究了高频交变电场对甲烷/空气扩散火焰的影响,在较大的电压变化范围内对比了火焰的形态、中间产物浓度和燃烧产物组成的变化。实验结果表明,随着电场电压从零开始不断增大直到发生气体放电,CH和OH的体积浓度先减小后增大,最后维持在比较稳定的范围内;产物中NO的体积分数先减小,后增大,发生气体放电后急剧减小,而CO体积分数变化与NO正好相反。发生气体放电时不完全燃烧加剧,火焰不稳定性增强。
In this paper, the influence of high frequency alternating electric field on methane / air diffusion flame was experimentally studied, and the changes of flame morphology, intermediate product concentration and combustion product composition were compared within a wide voltage range. The experimental results show that as the electric field voltage increases from zero until the gas discharge occurs, the volume concentration of CH and OH first decreases and then increases, and finally maintains within a relatively stable range; the volume fraction of NO in the product first decreases , Then increased and then decreased sharply after gas discharge, while the change of CO volume fraction was opposite to that of NO. In case of gas discharge, incomplete combustion aggravates and flame instability increases.