Abstract Spray combustion of Jet A-1 and a Jet A-1/10% m-xylene blend was investigated to assess the influence of m-xylene addition on the spray characteristics and soot formation in a swirl-stabilized model combustor with dimensions of 94 mm × 94 mm cross-section and 188 mm length. Keeping the thermal power output constant at 10 kW, globally fuel lean flames were established for the neat Jet A-1 and 10% m-xylene blend fuels. The velocity field of the model combustor, spray characteristics, and soot volume fraction and primary particle size were measured, respectively, using stereoscopic particle image velocimetry, a Fraunhofer diffraction based droplet sizer, and auto-compensating laser-induced incandescence. Addition of m-xylene to Jet A-1 caused measurable differences in the flow field and the spray characteristics under identical air and fuel flow rates. Soot concentrations were modified throughout the flame by the addition of m-xylene, resulting in significant alterations in the cumulative soot loading within the spray flame envelope. In both flames, peak soot volume fractions were detected in the lower central portion of the combustor at the base of the inner recirculation zone and in the upper portion of the combustor in the fuel shear layer. Our results demonstrate the nontrivial influence of altered distillation characteristics (and other physical properties) of the fuel, induced by m-xylene addition, on flow field structure and spray properties. Potential mechanisms for the influence of changing flow field and spray characteristics, in addition to m-xylene doping of the Jet A-1, on soot processes are discussed.

中文翻译：

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射流 A-1 中添加间二甲苯对模型燃烧器中湍流涡流稳定喷雾火焰中喷雾结构、流场和烟灰产生的影响

摘要 研究了 Jet A-1 和 Jet A-1/10% 间二甲苯混合物的喷雾燃烧，以评估间二甲苯添加对尺寸为 94 的涡流稳定模型燃烧器中喷雾特性和烟灰形成的影响。 mm × 94 mm 横截面和 188 mm 长度。保持热功率输出恒定在 10 kW，为纯 Jet A-1 和 10% 间二甲苯混合燃料建立了全球燃料稀薄火焰。模型燃烧器的速度场、喷雾特性、烟灰体积分数和初级粒径分别使用立体粒子图像测速仪、基于夫琅禾费衍射的液滴尺寸仪和自动补偿激光诱导白炽度进行测量。将间二甲苯添加到 Jet A-1 会导致在相同的空气和燃料流速下流场和喷雾特性出现可测量的差异。通过添加间二甲苯改变了整个火焰中的烟灰浓度，导致喷射火焰包络内累积烟灰负载的显着改变。在这两种火焰中，在内循环区底部的燃烧器中央下部和燃料剪切层中燃烧器的上部检测到峰值碳烟体积分数。我们的结果证明了由添加间二甲苯引起的燃料蒸馏特性（和其他物理特性）的改变对流场结构和喷雾特性的重要影响。改变流场和喷雾特性的潜在影响机制，