This study presents planar laser-induced fluorescence of fuel and hydroxyl (fuel- and OH-PLIF) and incandescence of soot (soot-PLII) together with morphology and nanostructure information of soot particles sampled via thermophoresis to clarify the in-cylinder soot processes under the influence of jet to jet interactions. The experiments were carried out in a single-cylinder, small-bore optical diesel engine fuelled by a low-sooting methyl decanoate fuel for diagnostic purposes. Two different nozzle configurations of one hole and two holes were used to simulate isolated single-jet and double-jet conditions, respectively. Results show that fuel-rich mixture formed in the jet–jet interaction region causes the faster initial growth of soot that persists for a longer period of time, compared to the soot formed in the wall-impingement region of the single jet. These soot particles impacted by the jet–jet interaction have larger aggregates composed of larger primaries, and the nanoscale internal structures show higher carbon fringe-to-fringe separations, both of which indicate higher particle reactivity and the formation stage of soot.

这项研究提出了平面激光诱导的燃料和羟基（燃料和OH-PLIF）的荧光以及烟灰的白炽化（soot-PLII）以及通过热泳法采样的烟灰颗粒的形态和纳米结构信息，以阐明在以下条件下的缸内烟灰过程射流对射流相互作用的影响。实验是在单缸，小口径光学柴油机中进行的，该发动机以低烟熏癸酸甲酯燃料为燃料，用于诊断。一个孔和两个孔的两种不同喷嘴配置分别用于模拟隔离的单喷和双喷情况。结果表明，在喷气-喷气相互作用区域形成的富含燃料的混合物会导致烟灰的初始生长更快，并持续更长的时间，与在单个喷嘴的壁撞击区域中形成的烟灰相比。这些受喷射-喷射相互作用影响的烟尘颗粒具有较大的聚集体，这些聚集体由较大的原始物质组成，并且纳米级内部结构显示出较高的碳穗间距离分离，这两者均表明较高的颗粒反应性和烟尘的形成阶段。