网络装药爆炸驱动破片低速梯次飞散特性

Low Velocity Step Dispersion Characteristics of Fragments Driven by Explosive Network Charge

为解决杀伤增强装置中柔性导爆索传爆过程的熄爆问题,设计了一种等静压网络装药结构,具有传爆稳定可靠性好的特点。采用数值仿真及静爆试验研究了网络装药爆炸驱动破片的飞散特性,结果表明:破片在网络装药驱动下能够实现低速梯次飞散,数值仿真结果与理论计算结果基本一致,误差控制在6.5%以内,试验结果显示7层破片分别以8.2 m/s,17.8 m/s,26.2 m/s,36.9 m/s,47.3 m/s,56.2 m/s,66.4 m/s速度梯度沿径向飞散,与理论计算值相比较低,主要是由于相邻层之间网络装药爆轰波的相互干扰,基于此将格尼方程修正系数优化为α=0.73β^(-0.316),同时各层内破片飞散速度一致性好,标准偏差分别为0.29 m/s,0.30 m/s,0.56 m/s,0.96 m/s,1.05 m/s,1.45 m/s,1.24 m/s,满足工程应用需求。

In order to solve the explosion extinguishing problem of flexible detonating cord in the lethality enhancement device,an explosive network charge structure prepared by isostatic pressing was proposed.The numerical simulation and static explosion test of the principle prototype were used to study the dispersion characteristics of the fragments driven by the explosion of the network charge.The results show that network charge has good detonation stability and reliability,and can drive fragments to achieve low-speed echelon dispersion.The results of numerical simulation and theoretical calculation are basically consistent,and the error is controlled within 6.5%.The experimental results show that the fragments are scattered along the radial direction with velocity of 8.23 m/s,17.78 m/s,26.16 m/s,36.93 m/s,47.34 m/s,56.23 m/s and 66.39 m/s,respectively.However,compared with the theoretical calculation value,it is obviously lower than the theoretical value,which is mainly due to the influence of network charge detonation wave on adjacent layer fragments.The standard deviations are 0.29 m/s,0.30 m/s,0.56 m/s,0.96 m/s,1.05 m/s,1.12 m/s and 1.54 m/s respectively,which meet the requirements of engineering application.