Emissions, spectrum and simulation data for gliding arc plasma assisted NH3-air mixtures for different global equivalence ratios

This study introduces a novel approach by applying plasma directly to the fuel stream in plasma-assisted swirl ammonia-air flames, facilitating immediate premixing after plasma interaction. This study bridges the gap in plasma-assisted ammonia combustion by simultaneously enhancing flame stability and reducing NOₓ emissions. It is the first to focus on generating NH₂ radicals through plasma actuation while maintaining OH production, thereby promoting the De-NOₓ pathway and significantly decreasing NOₓ emissions. Additionally, the present combustor achieves 45–60% reduction in NOₓ emissions while consuming only 1.4% of the power compared to existing literature.
All data recorded in this study are provided in the accompanying .xlsx file, organized into multiple tables. Table 1 presents emissions under plasma and no-plasma conditions, normalized to 15% dry oxygen. Table 2 provides the stability map for no-plasma conditions across a wide range of ammonia and air flow rates, while Table 3 shows the effect of plasma on lean and rich blowout limits. Table 4 reports the plasma-induced enhancement (in percentage) of OH, NH, and NH₂* intensities measured by the spectrometer, and Table 5 compares the NOx emission mitigation capacity of the present study with results from similar studies in the literature. Finally, Table 8, based on numerical simulations, indicates the production rates of different reactions with and without plasma at equivalence ratios of 0.8 and 0.9.

本研究提出一种创新方法，将等离子体（plasma）直接作用于等离子体辅助旋流氨-空气火焰的燃料流中，实现等离子体作用后即刻完成预混合。本研究填补了等离子体辅助氨燃烧领域的研究空白，可同时提升火焰稳定性并降低氮氧化物（NOₓ）排放。本研究首次聚焦于通过等离子体激发生成氨基自由基（NH₂）的同时维持羟基（OH）的产生，由此强化脱硝路径并显著降低氮氧化物排放。此外，本研究使用的燃烧室可实现45%~60%的氮氧化物排放削减，而其能耗仅为现有文献报道值的1.4%。

本研究记录的全部数据已收录于随附的.xlsx文件中，分为多个表格。表1展示了等离子体作用与无等离子体作用工况下的排放数据，已归一化至15%干氧浓度。表2给出了无等离子体作用工况下，宽流量范围的氨与空气流量对应的稳定工况图；表3展示了等离子体对贫燃和富燃熄火极限的影响。表4报告了通过光谱仪（spectrometer）测得的等离子体诱导的羟基（OH）、氨基（NH）以及激发态氨基自由基（NH₂*）强度的提升百分比；表5对比了本研究与文献中同类研究的氮氧化物减排能力。最后，表8基于数值模拟结果，给出了当量比为0.8和0.9时，有无等离子体作用下各反应的生成速率。