含能纤维素凝胶推进剂体系燃烧特征与稳定性

以羧甲基纤维素甘油醚硝酸酯(CMNGEC)为含能胶凝剂,通过配方设计,得到多组分凝胶推进剂体系。采用平板燃烧测试、热重-微商热重和差示扫描量热法,高速离心稳定性实验分析了新型凝胶推进剂体系的燃烧火焰特征、燃烧残渣量与体系稳定性。结果表明,CMNGEC凝胶推进剂体系燃烧具有周期性的膨胀、破裂、喷射及胶凝剂燃烧四个过程,燃烧残渣比Si O2凝胶推进剂体系少,其热分解可分成液体组分挥发、CMNGEC热分解和高氯酸铵热分解三个阶段。当CMNGEC胶凝剂含量达到3%,凝胶推进剂体系在670,2000,7000 g高速离心30 min条件下稳定,液体析出率均小于1%。

Combustion Characteristics and Stability of Energetic Cellulose Based Gel Propellant System

Multi-component gel propellant systems were obtained using carboxymethyl cellulose nitrate glycerol ether (CMNGEC) as gelling agent. The combustion flame characteristics, combustion residues and system stability of the gel propellant systems were analyzed by flat flame test, thermogravimetry-derivative thermogravimetry, differential scanning calorimetry techniques and high speed centrifugal stability test. Results show that the combustion behavior of CMNGEC system contains processes of periodic swelling, cracking, jet and burning of gelling agent, and the combustion residues are less than that of SiO₂ gel propellant system. The thermal decomposition of CMNGEC gel propellant system can be divided into three stages: the volatilization of liquid component, thermal decomposition of CMNGEC gelling agent and thermal decomposition of ammonium perchlorate. When the content of gelling agent is up to 3%, the gel propellant system is stable at 670 g, 2000 g and 7000 g centrifugation conditions for 30 min and the liquid precipitation rate is less than 1%.