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NO formation in counterflow partially premixed flames

机译：逆流部分预混火焰中未形成NO

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An experimental and computational study of NO formation in low-strain-rate partially premixed methane counterflow flames is reported. For progressive fuel-side partial premixing the peak NO concentration increased and the NO distribution along the stagnation streamline broadened. New temperature-dependent emissivity data for a SiO_2-coated Pt thermocouple was used to estimate the radiation correction for the thermocouple, thus improving the accuracy of the reported flame temperature. Flame structure computations with GRIMech 3.00 showed good agreement between measured and computed concentration distributions of NO and OH radical. With progressive partial premixing the contribution of the thermal NO pathway to NO formation increases. The emission index of NO (EINO) first increased and then decreased, reaching its peak value for the level of partial premixing that orresponds to location of the nonpremixed reaction zone at the stagnation plane. The observation of a maximum in EINO at a level of partial premixing corresponding to the nonpremixed reaction zone at the stagnation plane seems to be a consistent feature of low (< 20 s~(-1))-strain-rate counterflow flames.
机译：报道了在低应变率部分预混合甲烷逆流火焰中NO形成的实验和计算研究。对于渐进式燃料侧部分预混合，峰值NO浓度增加，并且沿停滞流线的NO分布变宽。 SiO_2涂层的Pt热电偶的新的依赖于温度的发射率数据用于估算热电偶的辐射校正，从而提高了所报告火焰温度的准确性。使用GRIMech 3.00进行的火焰结构计算表明，实测和计算的NO和OH自由基浓度分布之间具有良好的一致性。随着逐步的部分预混合，热NO途径对NO形成的贡献增加。 NO（EINO）的排放指数先上升然后下降，达到部分预混合水平的峰值，该水平相当于非预混合反应区在停滞平面的位置。在滞止平面上对应于非预混反应区的部分预混水平上观察到的EINO最大值似乎是低（<20 s〜（-1））应变速率逆流火焰的一致特征。

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