The decarbonization process of the automotive industry and the road transport sector has raised the interest on the development of cleaner fuels. A proper characterization of their properties and behavior under different operating conditions is mandatory to achieve an effective implementation in commercial engines. With this objective, the current work presents a comparison of two injectors from the Engine Combustion Network (ECN), namely Spray A and Spray D injectors, in terms of spray characteristics and combustion behavior for different fuels: diesel, dodecane, Hydrotreated Vegetable Oil (HVO), and two types of oxymethylene ethers (OME₁ and OME_x). The aim is to analyze how differences in nozzle geometry affect the behavior of different types of fuels. The experiments were carried out in a High Temperature and High Pressure test rig and operating conditions were chosen following ECN guidelines. Visualization techniques such as high speed schlieren imaging, OH^* chemiluminescence and diffused back illumination were implemented to analyze the differences in liquid length, vapor penetration, auto ignition, flame lift-off length, and soot formation for both nozzles. In general, results showed the same trend for all the fuels tested: longer liquid length and faster vapor penetration for Spray D, as well as higher ignition delay and longer lift-off length. However, it was found that these parameters were less sensitive to the nozzle diameter for the oxygenated fuels tested. Furthermore, a different trend was observed for OME₁, in terms of ignition behavior, in comparison to the other fuels. In terms of soot production, the Spray D nozzle increases its formation with the non-oxygenated fuels. In contrast, no soot was observed with the oxygenated ones under any operating conditions.

汽车工业和道路运输部门的脱碳进程引起了人们对开发更清洁燃料的兴趣。为了在商用发动机中实现有效实施，必须对它们在不同操作条件下的特性和行为进行适当的表征。为了这个目标，目前的工作比较了发动机燃烧网络 (ECN) 中的两个喷油器，即喷雾 A 和喷雾 D 喷油器，在不同燃料的喷雾特性和燃烧行为方面：柴油、十二烷、加氢植物油（ HVO）和两种甲醛醚（OME ₁和 OME _x）。目的是分析喷嘴几何形状的差异如何影响不同类型燃料的行为。实验是在高温高压试验台上进行的，操作条件是根据 ECN 指南选择的。可视化技术，例如高速纹影成像、OH ^*实施化学发光和漫射背照明来分析两种喷嘴在液体长度、蒸汽渗透、自动点火、火焰升起长度和烟灰形成方面的差异。总的来说，所有测试的燃料结果都显示出相同的趋势：Spray D 的液体长度更长，蒸汽渗透更快，以及更高的点火延迟和更长的起飞长度。然而，发现这些参数对所测试的含氧燃料的喷嘴直径不太敏感。此外，观察到 OME ₁的不同趋势，在点火行为方面，与其他燃料相比。在碳烟产生方面，Spray D 喷嘴增加了与非氧化燃料的形成。相比之下，在任何操作条件下，氧化的那些都没有观察到烟灰。