This paper investigates the influence of liquid jet fuel properties on flame lean blowout (LBO) using an annular coflow spray burner. This behavior has been studied before; however, inconsistent conclusions have been reached regarding the dependency of LBO performance on the properties that influence fuel atomization and mixture formation. LBO limits are measured at three different fuel flow rates to evaluate the influence of the atomization quality/regimes on LBO. It was found that the laboratory spray burner provides similar trends in LBO as a realistic gas turbine combustor but with less time and fuel consumption. Furthermore, the approach used in this work differs from traditional LBO measurements in that the fuel flow rate is kept constant while altering the air flow rate to allow for greater control of the atomization process, which is strongly affected by the fuel flow rate. The results suggest that, to an extent, higher amounts of liquid fuel entering the flame can enhance flame stability. They also suggest that testing at different fuel flow conditions and/or with variable injection hardware, coupled with testing of jet fuels exhibiting variations in key physical properties important in their atomization, is most likely the cause of discrepancy observed in previous works.

本文研究了使用环形同流喷雾燃烧器的液体喷射燃料特性对贫燃爆燃（LBO）的影响。以前已经研究了这种行为；然而，关于LBO性能对影响燃料雾化和混合物形成的性能的依赖性已经得出不一致的结论。在三个不同的燃料流量下测量LBO限值，以评估雾化质量/方案对LBO的影响。已经发现，实验室喷雾燃烧器与实际的燃气轮机燃烧器在LBO中具有相似的趋势，但是时间和燃料消耗更少。此外，这项工作中使用的方法与传统的LBO测量方法不同，在于燃料流量保持恒定，同时改变空气流量以更好地控制雾化过程，这受燃油流量的强烈影响。结果表明，一定程度上，进入火焰的液体燃料量更大，可以增强火焰稳定性。他们还建议，在不同的燃油流量条件下和/或使用可变的喷射硬件进行测试，再加上对喷气燃料进行测试时，喷气燃料表现出对雾化至关重要的关键物理特性的变化，很可能是先前工作中观察到的差异的原因。