环境气体氧含量对NEPE推进剂激光点火过程的影响

为研究环境气体氧含量对硝酸酯增塑聚醚(NEPE)推进剂激光点火过程的影响,采用CO2激光辐射点火并利用高速摄影仪记录NEPE推进剂的点火过程,讨论了环境气体氧含量对NEPE推进剂初焰位置与点火延迟时间的影响。结果表明,当环境气体氧含量小于NEPE推进剂热解产物中氧化性气体含量时,NEPE推进剂点火的气相反应发生在推进剂热解产物的分散区,初焰紧靠NEPE推进剂表面,环境气体氧含量变化不影响NEPE推进剂的点火延迟时间;当环境气体氧含量大于NEPE推进剂热解产物中氧化性气体含量时,NEPE推进剂点火的气相反应发生在推进剂热解产物与环境气体的扩散区,初焰远离NEPE推进剂表面,此时由于扩散区氧含量高于NEPE推进剂热解产物分散区氧含量,NEPE推进剂的点火延迟时间减小。

Effect of Oxygen Content in Environment Gas on the Laser Ignition Process of NEPE Propellant

To study the effect of oxygen content in environment gas on the laser ignition process of nitrate ester plasticizer polyether (NEPE) propellant ,the ignition process of NEPE propellant ignited by radiation of CO 2 laser was recorded by high speed video camera ,and the influence of oxygen content in environment gas on the first flame position and ignition de‐lay time of NEPE propellant was discussed .The results show that the ignition gas phase reaction of NEPE propellant oc‐curs in the dispersion region of the NEPE propellant pyrolysis product ,the first flame is close to the NEPE propellant sur‐face and the changing of oxygen content in environment gas has no effect on the ignition delay time of NEPE propellant when the oxygen content in environment gas is less than that of the oxidizing gas in the pyrolysis products of the propellant ;when the oxygen content in environment gas is larger than that of the oxidizing gas ,the ignition gas phase reaction of NEPE propellant occurs in the diffusion zone of the NEPE propellant pyrolysis products and the environment gas ,the first flame is away from the propellant surface .At this condition ,the oxygen content in the diffusion zone is higher than that of the dis‐persion region of the NEPE propellant pyrolysis product ,the ignition delay time of NEPE propellant decreases .