NEPE推进剂在氮气及空气中的点火燃烧特性  

Ignition and Combustion Characteristics of NEPE Propellant in Nitrogen and Air

作　　者：涂乘崟 陈雄[1] 周长省[1] 张北辰 李连波 TU Cheng-yin;CHEN Xiong;ZHOU Chang-sheng;ZHANG Bei-chen;LI Lian-bo(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;School of Mechanical Engineering,Nanjing Vocational University of Industry Technology,Nanjing 210023,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]南京工业职业技术大学机械工程学院,江苏南京210023

出　　处：《含能材料》2022年第8期811-818,共8页Chinese Journal of Energetic Materials

摘　　要：为了研究NEPE推进剂的点火燃烧特性,搭建了CO_(2)激光点火试验平台,使用高速摄影仪拍摄在不同气体环境下NEPE推进剂的燃烧过程,通过信号采集系统测量NEPE推进剂的点火延迟时间,对NEPE推进剂在0.1~3.0 MPa氮气及空气中的点火燃烧特性进行了研究。结果表明,环境压强和环境气体会影响NEPE推进剂的点火燃烧过程,环境压强越大,NEPE推进剂燃烧越激烈,且NEPE推进剂在空气中燃烧时比氮气中更加剧烈。NEPE推进剂的点火延迟时间随着环境压强的增大而减小,当环境压强从0.1 MPa增大到3.0 MPa时,氮气中的点火延迟时间由0.51 s减小到0.29 s,而空气中的点火延迟时间由0.32 s减小到0.18 s,但是当环境压强大于0.5 MPa时,环境压强对点火延迟时间的影响显著降低。同时环境压强会影响NEPE推进剂的燃烧速率,当环境压强从0.1 MPa增加到3.0 MPa时,氮气中的燃速从1.71 mm·s^(-1)提高到4.54 mm·s^(-1),空气中的燃速从2.51 mm·s^(-1)提高到11.4 mm·s^(-1),NEPE推进剂在空气中的燃烧速率增长幅度更大。最后通过燃速经验公式进行拟合,表明Vielle燃速公式更适用于表征NEPE推进剂在0.1~3.0 MPa下的燃速特性。The ignition and combustion characteristics of NEPE propellant were studied based on a CO_(2) laser ignition test platform established,in which the combustion processes of NEPE propellant in different gas environments were photographed using a high‑speed camera and the ignition delay times of NEPE propellant were measured under the pressure of 0.1-3.0 MPa in nitrogen and air through a signal acquisition system.The results show that the ambient pressure and gas environment strongly affect the ignition and combustion process of NEPE propellant.The combustion of NEPE propellant becomes more intense as the increase of ambient pressure,and the burning of NEPE propellant appears more violent in air as compared to that in nitrogen.The ignition delay time of NEPE propellant decreases with the ambient pressure increases in the range of 0.1 MPa to 3.0 MPa.Specifically,the reduction in ignition delay time of NEPE propellant is observed from 0.51 s to 0.29 s in nitrogen and from 0.32 s to 0.18 s in air.However,when the ambient pressure exceeds 0.5 MPa,the influence of the ambient pressure on the ignition delay time becomes insignificant.In addition,the burning rate of NEPE propellant is also found to be effectively affected by the ambient pressure.With the ambient pressure increases from 0.1 MPa to 3.0 MPa,the enhancement in burning rate of NEPE propellant can be seen from 1.71 mm·s^(-1) to 4.54 mm·s^(-1) in nitrogen and from 2.51 mm·s^(-1) to 11.4 mm·s^(-1) in air,and thus a stronger increase in the burning rate is observed in air.Finally,the experimental data of burning rate were fitted by an empirical formula,which indicates the Vielle burning rate formula is more suitable for reproducing the burning rate characteristics of NEPE propellant especially at 0.1-3.0 MPa.

关 键 词：NEPE固体推进剂 激光点火 氮气 空气 燃烧特性 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] V435[航空宇航科学与技术—航空宇航推进理论与工程]