This paper presents an experimental study of turbulent non-premixed jet flames of ethylene/nitrogen where the nitrogen is substituted with different proportions of hydrogen and/or ammonia. The focus is largely on the effects of hydrogen and ammonia on soot production in turbulent flames. A combination of pointwise, laser-induced fluorescence in the visible and UV bands (LIF-UV–visible), and laser-induced incandescence (LII) is used to measure soot precursors and soot along the flame centerline. All signals are collected at a repetition rate of 10 Hz with fast photomultiplier tubes to resolve the time decay. In a separate experiment, joint imaging of LIF-OHCH is also performed at a repetition rate of 10 kHz. Hydrogen substitution is found to increase the production of soot, whereas ammonia substitution inhibits soot formation. The peak mean soot volume fraction is almost a factor of 3 lower in the 25% ammonia case in comparison to the 25% nitrogen case. The mean signal decay time constant decreases with ammonia substitution, implying the formation of smaller soot nanoparticles. The mean signal decay time constant remains unaffected with hydrogen substitution. Measured peaks in LIF-CH and LIF-OH are reduced with ammonia substitution but only in regions upstream of where soot is formed. Further downstream in the sooting region, neither OH nor CH appear to be affected by the substitution of N₂ with H₂ or NH₃.

本文介绍了对乙烯/氮的湍流非预混喷射火焰的实验研究，其中氮被不同比例的氢和/或氨替代。重点主要放在氢和氨对湍流火焰中烟尘产生的影响上。结合使用点状，激光在可见和紫外波段（LIF-UV-可见）的荧光以及激光诱导的白炽度（LII）来测量烟灰前体和沿火焰中心线的烟灰。用快速光电倍增管以10 Hz的重复频率收集所有信号，以解决时间衰减问题。在另一个实验中，对LIF-OH进行联合成像CH也以10 kHz的重复频率执行。发现氢取代增加了烟灰的产生，而氨取代抑制了烟灰的形成。与25％氮气的情况相比，在25％氨的情况下，峰值平均烟灰体积分数几乎降低了3倍。平均信号衰减时间常数随着氨的取代而降低，这意味着形成了较小的烟灰纳米颗粒。平均信号衰减时间常数不受氢取代的影响。LIF-CH和LIF-OH中的测得峰通过氨取代而降低，但仅在形成烟灰的上游区域降低。在烟ot区域的更下游，OH和CH似乎都不受N ₂被H ₂或NH ₃取代的影响。