2,4-二硝基苯甲醚基熔铸含铝炸药圆筒试验及爆轰产物状态方程

Cylinder Test and Equation of State for DNAN-based Aluminized Melt-cast Explosive

为明确含铝炸药冲击起爆过程中爆轰产物状态方程参数的确定方法,采用2,4-二硝基苯甲醚(DNAN)基熔铸含铝炸药RA1(奥克托今(HMX)/DNAN/Al)和对应含氟化锂(LiF)炸药RF1(HMX/DNAN/LiF)开展50 mm标准圆筒试验。利用电探针测速法和光子多普勒速度测试技术获得RA1和RF1炸药的爆速和圆筒膨胀速度,并通过遗传算法和数值模拟技术分别确定两种炸药的爆轰产物状态方程参数。对比RA1与RF1炸药的圆筒速度变化曲线发现:在0~4.6μs时间内,两曲线重合度较高;在4.6μs以后,随着铝粉反应量的增加,两曲线出现明显分离。结果表明:铝粉在爆轰阶段反应量很少,反应主要发生在产物膨胀阶段,由此可得在含铝炸药冲击起爆过程中铝粉的反应量可近似忽略,冲击起爆数值模拟时含铝炸药爆轰产物的状态可由对应含LiF炸药的产物状态方程描述。

To determine the parameters of equation of state(EOS)for detonation products in the shock initiation of aluminized explosives,a series of 50 mm standard cylinder tests was performed for the DNAN-based aluminized RA1 melt-cast explosive(HMX/DNAN/Al)and its corresponding explosive RF1(HMX/DNAN/LiF)that contains the lithium fluoride(LiF).The detonation velocities of two kinds of explosives and the expanding velocities of cylinders were measured by using the electric probes and the photonic Doppler velocimetry(PDV).The EOS parameters for detonation products of RA1 and RF1 are both determined by genetic algorithm and numerical simulation.It is found that the wall velocity histories of RA1 and RF1 are almost consistent within 0-4.6μs,but separate obviously after 4.6μs due to the increasing reaction degree of aluminum powder.This indicates that the aluminum powder mainly reacts in the expansion process of detonation products,and hardly participates in chemical reaction during the detonation as well as the shock initiation.Therefore,in the numerical simulation of shock initiation,the detonation products of the aluminized explosives can be described by the EOS for the detonation products of their corresponding explosives that contain the lithium fluoride.