图表示不同二次氮气压力下焰流温度与轴向距离的关系。从图中可以看出，贴近雾化喷嘴的区域受一次氮气影响温度上升较为缓慢，随着气体不断地流向燃烧室中游，温度极速升高，并在燃烧室中游升至最高。由于二次氮气的掺混现象，燃烧室下游的焰流温度开始逐渐下降。接着，气体经过拉瓦尔喷嘴后会出现轻微的欠膨胀状态，在喷管扩张段会产生局部的激波震荡。最后，气体进入空气域中的自由射流区，温度曲线由于激波的形成会出现多次波动震荡，同时由于热辐射现象和热传导现象，焰流的温度会随着轴向距离的增加而逐渐的降低。

The figure represents the relationship between flame flow temperature and axial distance under different secondary nitrogen pressure. As can be seen from the figure, the temperature in the area close to the atomization nozzle rises more slowly due to the influence of primary nitrogen, and rises extremely rapidly as the gas continues to flow to the midstream of the combustion chamber, and rises to the highest in the midstream of the combustion chamber. Due to the doping phenomenon of secondary nitrogen, the flame stream temperature downstream of the combustion chamber began to gradually decline. Then, the gas passes through the Laval nozzle in a slightly underexpanded state, and a local surge oscillation is generated in the nozzle expansion section. Finally, the gas enters the free jet region in the air domain, and the temperature profile fluctuates and oscillates several times due to the formation of the surge, while the flame temperature decreases gradually with the increase of the axial distance due to the heat radiation and heat conduction phenomena.