Due to the heavy consumption of the fossil fuels in the transportation sector and the furnace factory, a large amount of soot is discharged and seriously threatened the environment and the human health. The present work focuses on examining the characteristics of soot produced from iso-octane/2,5-dimethylfuran (DMF) non-swirling and swirling inverse diffusion flames (IDFs). Morphology, nanostructure, graphitization and oxidation reactivity of nascent soot particles from 100% iso-octane, 50% iso-octane/50% DMF and 100% DMF IDFs were investigated by using high resolution transmission electron microscopy, X-ray diffraction, and thermogravimetric analysis, respectively. The effect of swirling on the soot characteristics was discussed. Results demonstrate that the nascent soot from pure iso-octane flames shows the morphology with liquid-like deposition and turbostratic nanostructure, while the soot from pure DMF displayed more primary particle with the nanostructure contained by many well-organized lattice fringes. Because the mixability of air and fuel under the action of swirling is higher than that of non-swirling condition, the soot particles from swirling conditions reveal more ordered nanostructure with longer fringe length and lower fringe tortuosity, as well as higher soot graphitization and lower oxidation reactivity.

由于运输部门和熔炉工厂对化石燃料的大量消耗，大量的烟灰被排放，严重威胁环境和人类健康。本工作着重于研究由异辛烷/ 2,5-二甲基呋喃（DMF）产生的无旋流和旋流的反向扩散火焰（IDF）产生的烟尘特性。使用高分辨率透射电子显微镜，X射线衍射和热重分析法研究了100％异辛烷，50％异辛烷/ 50％DMF和100％DMF IDF形成的初生烟灰颗粒的形貌，纳米结构，石墨化和氧化反应性分析。讨论了旋流对烟灰特性的影响。结果表明，纯异辛烷火焰产生的初生烟灰呈现出具有液体状沉积和涡轮层状纳米结构的形态，而纯DMF产生的烟灰则表现出更多的初级粒子，其纳米结构被许多组织良好的晶格条纹所包含。由于在旋流作用下空气和燃料的混合性高于非旋流条件，因此在旋流条件下产生的烟尘颗粒显示出更有序的纳米结构，具有更长的条纹长度和更低的曲折曲折度，以及更高的烟灰石墨化和更低的氧化性反应性。