This work uses an annular co-flow spray burner as a laboratory test method for evaluating one of the important jet fuel figures of merit, namely lean blowout (LBO), and investigates the coupling of physical and chemical properties affecting this phenomenon. Previous work has shown that relative trends in LBO from different fuels in a real gas turbine are well reflected in this burner setup. Representative characteristics for fuel heat of combustion, volatility, atomization, and pressure are used to produce correlations predicting the LBO for this spray burner, thus these characteristics are considered important toward the prediction of LBO in real gas turbine combustors. The results of this testing are compared to general relations for spray flames as published in prior literature; it is found that equivalence ratio at LBO is positively correlated to fuel flow rates and effective evaporation, and inversely correlated to combustion pressure, heat of combustion, and spray droplet diameter. Using simultaneous OH Planar Laser Induced Fluorescence and Mie scattering imaging of the spray and flame structure, the liquid loading in the flame region is also analyzed for surrogate jet fuels which have comparable derived cetane number (DCN) but have very different compositions. Characteristics that can affect the amount of liquid fuel entering the flame region in near-LBO conditions are discussed. The use of surrogates allows for discussion of the competing effects of volatility and reactivity of fuel components. It is found that the most stable flames occur when the interplay of fuel atomization/volatility and reactivity result in substantial penetration of fuel droplets containing components with high DCN.

这项工作使用环形同流喷雾燃烧器作为实验室测试方法，以评估重要的喷气燃料品质因数之一，即稀燃（LBO），并研究影响该现象的物理和化学性质的耦合。先前的工作表明，这种燃烧器的设置很好地反映了真实燃气轮机中来自不同燃料的LBO相对趋势。燃烧，挥发性，雾化和压力的燃料热的代表性特征用于产生相关性，以预测该喷雾燃烧器的LBO，因此，这些特征被认为对预测真实燃气轮机燃烧室中的LBO非常重要。将测试结果与现有文献中有关喷雾火焰的一般关系进行了比较；结果发现，LBO的当量比与燃料流量和有效蒸发量呈正相关，与燃烧压力，燃烧热和喷雾直径成反比。使用喷雾和火焰结构的同时OH平面激光诱导荧光和Mie散射成像，还分析了具有可比的十六烷值（DCN）但组成非常不同的替代喷气燃料在火焰区域中的液体负载。讨论了可能影响在接近LBO条件下进入火焰区域的液体燃料量的特性。替代物的使用允许讨论燃料组分的挥发性和反应性的竞争作用。