图表示不同煤油与氧气流量下焰流温度与轴向距离的关系。从图中可以看出，一方面，焰流温度随着喷涂距离的不断增加，整体呈下降趋势；另一方面，较大流量的煤油与氧气在燃烧时会释放更多的热能，在相同喷涂距离下的焰流温度也越高。而为保证顺利点火和安全稳定运行，煤油与氧气流量的工艺窗口通常较窄。因此，通过改变煤油和氧气流量只能实现小幅度降温。

The figure represents the relationship between flame flow temperature and axial distance under different kerosene and oxygen flow rates. From the figure, it can be seen that, on the one hand, the flame temperature decreases with the increasing distance of spraying; on the other hand, the larger flow of kerosene and oxygen will release more heat energy when burning, and the flame temperature will be higher at the same spraying distance. To ensure smooth ignition and safe and stable operation, the process window of kerosene and oxygen flow rate is usually narrow. Therefore, only a small temperature reduction can be achieved by changing the kerosene and oxygen flow rates.