为研究一种聚甲氧基二甲醚(PODE
2-4
)掺混正庚烷/甲苯混合燃料对碳烟颗粒理化性质的影响,搭建了同轴射流反扩散火焰燃烧平台,采用透射电子显微镜(TEM)、拉曼光谱仪(Raman)和热重分析仪(TGA)对颗粒样品进行分析。结果表明:随着PODE
2-4
由0掺混至30%
碳粒子直径逐渐向小粒径方向偏移,平均粒径逐渐下降,颗粒内部微晶曲率平均值逐渐增大,微晶长度则呈相反趋势,且减小幅度逐渐增大;一阶拉曼光谱中代表晶格内部缺陷和无序结构的D峰与代表石墨稳定结构的G峰的积分强度之比逐渐增加,石墨化程度降低,无序程度增大;质量损失速率峰值温度、起始氧化温度、燃尽温度和表观活化能均呈下降趋势,颗粒反应活性增强。分析结果表明,PODE
2-4
可作为燃料添加剂改变碳烟颗粒微观结构,进而增强其氧化活性,该研究可为实际工程应用中PODE_n与柴油掺混燃烧并促进DPF再生提供一定的理论参考。
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