In order to investigate the mechanism on the microstructure of soot by adding biodiesel to diesel, the soot of biodiesel/diesel mixed fuel was collected by a constant volume combustion chamber, and the microstructure characteristics of soot were studied by SAXS and HRTEM techniques. The results showed that the added biodiesel reduced the delay of ignition and advanced the peak time of soot generation. The particulate matter in soot underwent a deep internal and external oxidation process. The accumulation of internal oxidation products forms a certain filling effect, which affects the subsequent oxidation rate. The microstructure of the single particulate matter was further refined to a cylindrical-like 3D sub-model filled with voids. The improved sub-model optimizes the DPF pressure drop model and provides a potential research basis for the DPF catalytic oxidation and regeneration model.

为研究柴油中添加生物柴油对碳烟微观结构的影响机理，采用定容燃烧室对生物柴油/柴油混合燃料的碳烟进行收集，并采用SAXS和HRTEM技术研究了碳烟的微观结构特征。结果表明，添加生物柴油减少了点火延迟，提前了烟尘产生的高峰时间。烟尘中的颗粒物经历了深度的内部和外部氧化过程。内氧化产物的堆积形成一定的填充作用，影响后续的氧化速率。单个颗粒物的微观结构被进一步细化为填充有空隙的圆柱形 3D 子模型。改进的子模型优化了 DPF压降模型，为DPF催化氧化再生模型提供了潜在的研究依据。