一种同轴双元组合装药的爆轰波形及驱动性能

Detonation Waveform and Driving Performance of a Kind of Coaxial Binary Composite Charge

采用DNTF基高爆速炸药包裹高爆热含铝炸药的方式制备了一种同轴双元组合装药,通过高速扫描法研究了其爆轰波形特征,并通过圆筒试验,对比了组合装药与单一装药驱动性能的差异。结果表明,由于所用的两种炸药稳态爆速相差1. 8 mm/μs,使得内层装药的爆轰波形出现了明显的汇聚效应,提升了其波阵面传播速度,导致其爆轰反应区宽度减小,降低了该组合装药所释放的能量,使得圆筒比动能在产物膨胀初期比两种单一装药的平均值低0. 095 k J/g,在产物膨胀的中后期,仍偏低0. 06 k J/g;但产物压力在相对比容增至1. 95后超过了高爆速单一装药,产物相对比容增至3. 07时,仅略低于低爆速单一装药。

A kind of coaxial binary composite charge was prepared by means of DNTF based explosive with high detonation velocity to wrap aluminized explosive with high heat of detonation.Its detonation waveform characteristics were studied by high-speed scanning method and the difference in driving characteristics of the composite charge and single charge was compared through cylinder test.Results show that because the difference of steady detonation velocity of the two kinds of explosives is 1.8mm/μs,it makes the detonation waveform of the inner layer charge appear obvious convergence effect,boost its wave front propagation velocity,also cause the detonation reaction zone width decrease and reduce the energy released by the composite charge.The specific kinetic energy at beginning of the expansion of the product is 0.095kJ/g lower than that of the single explosive charge,then in the middle and late stage of product expansion,it is still 0.06kJ/g lower.However,after the relative molar volume of the product increases to 1.95,the product pressure exceeds the single charge with high detonation velocity,and when the relative molar volume increases to 3.07,the product pressure is only slightly lower than the single charge with low detonation velocity.