Abstract RP-3 kerosene fuel is the dominant hydrocarbon fuel used in civilian airplanes in China. Lately, many administration and universal organizations imposed a stringent standard for civilian airplanes pollutants emission. The amount of pollutants emission can be affected by the introduction of a variety of additives into flames, such as inert diluents, gaseous additives. This paper reports the effects of different inert gases (nitrogen and helium) and carbon dioxide dilutions in the oxidizer side on soot characteristics generated from RP-3 kerosene inverse diffusion flames. Flame diluted by carbon dioxide produced less amount of soot compared to flames diluted by nitrogen and helium, possibly because of changes in flame shape and properties such as flame diameter and availability of oxygen atoms. Carbon dioxide suppressed soot precursors formation in inception zone and released particles with smaller diameter due to lack of hydrogen radicals, an increase of hydroxyl radicals pool concentration, and decrease in flame temperature. Flame diluted by helium generated much soot aggregates with bigger primary particles diameter compared to base flame (flame diluted by nitrogen) as a result of high temperature. Soot particles produced in carbon dioxide diluted flame had more amorphous nanostructure, longer interlayer spacing and nanocrystallite height, shorter nanocrystallite width, lesser number of layers, and higher oxygen content compared to flame diluted by nitrogen and helium, which reflected a better oxidation reactivity among other diluted flames.

中文翻译：

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不同稀释度下商用 RP-3 煤油燃烧产生的碳颗粒的纳米级检测

摘要 RP-3煤油燃料是我国民用飞机主要使用的碳氢燃料。近期，许多政府和国际组织对民用飞机的污染物排放制定了严格的标准。将各种添加剂引入火焰中会影响污染物排放量，例如惰性稀释剂、气态添加剂。本文报告了氧化剂侧的不同惰性气体（氮气和氦气）和二氧化碳稀释液对 RP-3 煤油逆向扩散火焰产生的烟尘特性的影响。与用氮气和氦气稀释的火焰相比，用二氧化碳稀释的火焰产生的烟灰量更少，这可能是因为火焰形状和特性（例如火焰直径和氧原子的可用性）发生了变化。由于缺乏氢自由基、羟基自由基池浓度增加和火焰温度降低，二氧化碳抑制了起始区烟灰前体的形成并释放出直径较小的颗粒。由于高温，氦气稀释的火焰与基础火焰（氮气稀释的火焰）相比，产生了大量具有更大初级颗粒直径的烟灰聚集体。与氮气和氦气稀释的火焰相比，二氧化碳稀释火焰产生的烟尘颗粒具有更多的无定形纳米结构、更长的层间距和纳米晶高度、更短的纳米晶宽度、更少的层数和更高的含氧量，反映了更好的氧化反应性等稀释的火焰。