The importance of fuel injection methods and their atomisation characteristics has been well described in literature. Also, there are a large number of studies in literature detailing the impact of bulk properties of conventional fuels on atomisation and spray characteristics. However, there is a lack of knowledge on how different alternative fuels, and specifically aromatic species, impact spray and atomisation characteristics. In this investigation, the impact of alternative fuels, selected aromatic species and their properties on spray atomisation was studied. Details of how different aromatic structures, bonds and other micro properties of aromatics species impact spray and atomisation characteristics were investigated. To achieve this objective, testing was conducted using a Rolls-Royce Tay engine fuel injector. It was found that the droplet sizes in the form of the Sauter Mean Diameter (SMD) correlate well with fuel properties including density, viscosity and surface tension, which is in line with other published literature. Moreover, it was found that there are several aromatic species (ethylbenzene, cumene and tert-butylbenzene) which display improved atomisation. This indicates that the size of the aliphatic groups attached to the benzene ring in the aromatic molecule impact on the drop size and thereby the combustion characteristics. The worst performers were polyaromatic naphthalene compounds. With the increasing push for fuels with selected aromatic species in the future, this study provides knowledge on the impact of their on the atomisation characteristics.

中文翻译：

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芳香族物质选择以及替代燃料的微观和整体特性对雾化的影响

燃料喷射方法及其雾化特性的重要性已在文献中得到充分描述。此外，文献中有大量研究详细说明了常规燃料的体积特性对雾化和喷雾特性的影响。然而，对于不同的替代燃料，特别是芳香族物质如何影响喷雾和雾化特性，缺乏知识。在这项调查中，研究了替代燃料、选定的芳香族物质及其性质对喷雾雾化的影响。研究了芳烃种类的不同芳烃结构、键和其他微观特性如何影响喷雾和雾化特性的细节。为了实现这一目标，使用劳斯莱斯 Tay 发动机燃油喷射器进行了测试。研究发现，Sauter 平均直径 (SMD) 形式的液滴尺寸与燃料特性（包括密度、粘度和表面张力）密切相关，这与其他已发表的文献一致。此外，还发现有几种芳香族物质（乙苯、异丙苯和叔-丁基苯），其表现出改善的雾化。这表明芳香分子中与苯环相连的脂肪族基团的大小会影响液滴大小，从而影响燃烧特性。表现最差的是多环芳烃化合物。随着未来对具有选定芳烃种类的燃料的日益推动，本研究提供了有关其对雾化特性影响的知识。