以2 MPa二次氮气压力为例对焰流速度进行分析，如图所示。二次氮气的加入对燃烧室内部气体的速度并无明显影响，但对喷管直管段和自由射流区的焰流速度影响较大。气体通过拉瓦尔喷嘴加速至超音速状态，因受拉瓦尔喷嘴喉部气体函数关系的限制，注入二次氮气后焰流温度的降低会导致焰流的速度也随之降低，速度最高可达1860 m/s（不加二次氮气的焰流速度2239 m/s），最大速度下降379 m/s。

The flame flow velocity was analyzed at 2 MPa secondary nitrogen pressure as an example, as shown in the figure. The addition of secondary nitrogen does not have a significant effect on the velocity of the gas inside the combustion chamber, but has a greater effect on the flame flow velocity in the straight section of the nozzle and the free jet region. Gas through the Laval nozzle accelerated to supersonic state, due to the Laval nozzle throat gas function relationship, the injection of secondary nitrogen after the flame temperature reduction will lead to a reduction in flame velocity, the speed of up to 1860 m / s (without the addition of secondary nitrogen flame velocity 2239 m / s), the maximum velocity drop of 379 m / s.