RDX对改性单基发射药燃烧性能的影响

为提高单基发射药(硝化棉/二硝基甲苯/邻苯二甲酸二丁酯/二苯胺,NC/DNT/DBP/DPA)的能量,在单基发射药中加入不同含量(5%、10%、15%、20%)、不同粒度(0.2,3.7,7.6,100.0μm)的黑索今(RDX),制备并得到改性单基发射药。通过密闭爆发器实验研究了RDX含量、粒度对改性单基发射药燃烧性能的影响规律。实验结果表明:在RDX粒度为7.6μm时,改性单基发射药的燃速随RDX含量的增加先降低再升高,在RDX含量为10%附近存在一个最小值;在50~p_(dpm)MPa(p_(dpm)为最大压力陡度所对应的压力值),改性单基发射药的燃速压力指数平均值均大于1。当RDX含量为5%时,改性单基发射药的燃速随RDX粒度的减小而减小;在50~p_(dpm)MPa,粒度为0.2,3.7μm的RDX改性单基发射药的燃速压力指数平均值均小于1,粒度为7.6,100.0μm的RDX改性单基发射药的燃速压力指数平均值均大于1。

Effect of RDX on Combustion Performance of Modified Single Base Propellant

To improve the energy of a kind of single base propellant(nitrocellulose/2,4-dinitrotoluen/dibutyl phthalate/diphenylamine, NC/DNT/DBP/DPA), cyclotrimethylenetrinitramine(RDX) with different contents(5%, 10%, 15% and 20%) and different particle sizes(0.2 μm, 3.7 μm, 7.6 μm and 100.0 μm) were added into this single base propellant, and then the modified single base propellants containing RDX were prepared and obtained.The effect of content and particle size of RDX on the combustion performances of these modified single base propellants was studied by closed bomb experiments.The results show that: when the RDX particle size is 7.6 μm, with increasing the content of RDX, the burning rate of the modified single base propellant first decreases and then increases, and has a minimum value when the content of RDX is in the vicinity of 10%;the average values of the burning rate pressure exponent of modified single base propellants are all greater than 1 in the pressure range of 50-pdpm MPa(pdpm is the corresponding pressure when dp/dt reaches its maximum value);when the content of RDX is 5%, the burning rate of modified single base propellant decreases with decreasing the particle size of RDX, and in the pressure range of 50-pdpm MPa, the average values of the burning rate pressure exponents of modified single base propellants with 0.2 μm and 3.7 μm RDX are both less than 1, while the mean values of the burning rate pressure exponent of modified single base propellants with 7.6 μm and 100.0 μm RDX are both greater than 1.