CL-20含量及其粒度级配对NEPE推进剂燃烧性能的影响

采用静态与水下声发射法测试了CL-20含量及其粒度级配对NEPE推进剂燃速与压强指数的影响;采用DSC与TG-IR联用研究了CL-20对NEPE推进剂热分解行为的影响。结果表明,随着CL-20质量分数由42%增至50%,推进剂燃速与压强指数上升,燃烧效率提高,表明CL-20氧化能力高于GAP/硝酸酯含能黏合剂体系;随着CL-20/HMX、CL-20/Al质量比增高,推进剂燃速上升,燃烧效率上升;CL-20对推进剂燃速和压强指数的贡献高于HMX;随着CL-20/AP质量比增高,CL-20/AP混合体系分解产物氧化能力降低,燃烧反应速率降低,燃速降低;CL-20粒度级配对NEPE推进剂燃烧行为影响显著,当CL-20的粒径(d50)在5~50μm时,随着细粒度CL-20含量增高,推进剂燃速与燃速压强指数下降;当体系中存在超细粒度CL-20(d50=500nm)时,推进剂燃速与燃速压强指数随着超细粒度CL-20含量的增加而有所增加,4种粒度CL-20对NEPE推进剂燃速的贡献顺序为:粗粒度>中粒度>超细粒度>细粒度。

Influence of CL-20 Content and Its Particle Size Gradation on Combustion Performance of NEPE Propellants

The influence of CL-20 content and its particle size gradation on the burning rates,pressure exponents and thermal decomposition behaviors of NEPE propellants was systematically studied by static and underwater acoustic emission methods and DSC-TG-IR coupling technique,respectively.The results indicates that with mass ratio of CL-20 increases from 42%to 50%,the burning rates and pressure exponents of propellants increase,and the combustion efficiency of the propellant improves,indicating that the oxidization of CL-20 is higher than that of energetic GAP/binder systems.With the increase of CL-20/HMX and CL-20/Al mass ratios,the burning rates and combustion efficiency of propellants increase.The contribution of CL-20 on combustion rates and pressure exponents of propellants is higher than that of HMX.With the increase of CL-20/AP mass ratio,the oxidization of propellants is decreased and burning rates reduced.The oxidization activity of decomposition products of CL-20 is lower than that of AP.The particle size gradation of CL-20 has considerable effects on the combustion performance of propellants.When the particle size(d50)of CL-20 is in the range of 5-50μm,the burning rates and pressure exponents of propellants are decreased with the increase of CL-20 content.However,as superfine CL-20(d50=500nm)exists in the propellants,the burning rates and pressure exponents have a significant growth with increasing the CL-20 content.The relative burning rate contributions of different CL-20 particle sizes on NEPE propellants are in the sequence of coarse grain>medium grain>superfine grain>fine grain size.