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采用CO2激光器、高速摄像机和红外热像仪等设备研究了NEPE推进剂激光辐照下点火燃烧过程和推进剂表面温度分布,分析了激光热流密度对点火延迟时间的影响以及NEPE推进剂对激光卸载的动态响应。结果表明:增大激光热流密度可以减小点火延迟时间,当热流密度小于6.7×105W·m-2时,点火延迟时间随热流密度的增大而显著减小,而热流密度大于该值时,点火延迟时间随热流密度的增大而变化微小。激光辐照对NEPE推进剂的燃烧有显著影响,使火焰明亮并伴有大量火花,推进剂表面的温度大大提高。激光卸载后,推进剂表面温度并未立即下降,而是在短暂的迟滞后跌落,随后又出现小幅度的缓慢上升。
The effects of laser heat flux on the ignition delay time and the effects of NEPE propellant on the unloading of laser were analyzed by CO2 laser, high speed camera and infrared camera. The ignition and combustion process of NEPE propellant under laser irradiation and the surface temperature distribution of propellant were studied. Dynamic response. The results show that when the heat flux density increases, the ignition delay time can be reduced. When the heat flux density is less than 6.7 × 105W · m-2, the ignition delay time decreases significantly with the increase of heat flux density. When the heat flux density is larger than this value, Ignition delay time changes slightly with the increase of heat flux density. Laser irradiation has a significant effect on the combustion of NEPE propellants, making the flame bright and accompanied by a large number of sparks, and the temperature of the propellant surface is greatly increased. After unloading the laser, the surface temperature of the propellant did not immediately drop, but dropped after a short delay, followed by a slight, gradual increase.