基于PLIF技术的气氧/气甲烷同轴剪切喷嘴试验

以数值仿真的结果作为参考,开展了基于PLIF(平面激光诱导荧光)技术、高速摄影技术等非接触光学燃烧诊断技术的气氧/气甲烷同轴剪切喷嘴试验研究。通过联合光学诊断对不同设计工况的燃烧流场进行诊断测量,获得燃烧室内OH分布,燃烧流场发展演化过程、火焰的结构等信息,对燃烧流场进行详细的分析。研究结果表明:气氧/气甲烷剪切燃烧火焰存在明显的剪切燃烧层,且随着轴向距离的增加,火焰逐渐失稳；随燃氧速度比的增加,流场涡旋作用明显加强,火焰根部稳定段变短,瞬时火焰结构卷曲和褶皱增多；仿真计算的OH分布与试验测得的OH分布相似,仿真模型能够合理预测气氧/气甲烷同轴剪切喷嘴的燃烧流场。 

Experiment on coaxial shear injector of GO2/GCH4 based on PLIF

Based on the results of numerical simulation, experimental research on the GO2/GCH4 coaxial shear injector was carried out using non-intrusive optical diagnostic techniques, including PLIF（planar laser induced fluorescence）, high-speed camera and so on. The OH distribution of combustion chamber, the development of combustion flow field and the flame structure were obtained by measuring the combustion flow field at different operating conditions. The results showed that there were obvious shear combustion layers in the combustion flame of GO2/GCH4. As the axial distance increased, the flame gradually lost its stability. With the increase of the velocity ratio, the vortex of the flow field was obviously strengthened, the flame root stabilization section became shorter and the flame structure had more curl and wrinkles. The simulation of OH distributions is consistent with the measurement of OH distribution, indicating the simulation model can simulate the combustion flow field of GO2/GH4.