Ignition Reaction Rate Model of RDX-based Aluminized Explosives under Shock Waves

doi:10.3969/j.issn.1000-1093.2021.02.011

Abstract

Abstract: The shock initiation of aluminized explosives was experimented and simulated to investigate the influence of constituent aluminum powder sizes on shock ignition and establish a microscopic reaction rate model for shock ignition of the RDX-based aluminized explosives. Four explosive formulae with the same initial component ratio and RDX particle size but with different aluminum grain sizes (5 μm, 16 μm, 40 μm and 100 μm) were designed, and the shock initiation experiments were conducted for these four RDX-based aluminized explosives. At the same time, a microscopic ignition model of RDX-based aluminized explosives was proposed by reasonable assumption, a microscopic reaction rate model considering the ignition growth was established, and the above experiments were numerically modeled by using this microscopic reaction rate model and I&G model of aluminized explosives. The experimental and simulated results show that 0.80%, 2.45%, 3.20% and 4.15% of aluminum are involved in the reaction for RDX-based aluminized explosives with 100 μm, 40 μm 16 μm and 5 μm aluminum powders in front of the CJ plane, respectively; with the decrease in aluminum powder sizes in aluminized explosives, the reaction rate of aluminum powders in front of the CJ plane increases, the faster the propagation velocity of the precursory shock wave increases, the greater the peak pressures in aluminized explosives are, and the time interval between the occurrence time of the peak pressure and the arrival time of the precursory shock wave are shorter, the explosive impact sensitivity increases. The pressure calculated using this microscopic reaction rate model are more reasonable agreement with the experimental results compared with I&G model. The microscopic model is applicable for simulating the reaction characteristics of large size aluminum powder in RDX-based aluminized explosives (the diameter of aluminum powder is larger than 1/10 of the explosive particle size) for the shock ignition process. For RDX-based aluminized explosives with 100 μm and 40 μm aluminum powders, the maximum error between the calculated parameters and the experimental results for arrival time of precursory shock wave, peak-pressure time and peak pressure at each Lagrange position is less than 10%.

Key words: aluminizedexplosive, aluminumparticlesize, hot-spot, microscopicignitionmodel, reactioncharacteristic

CLC Number:

WANG Hongfu， BAI Fan， LIU Yan， DUAN Zhuoping， HUANG Fenglei. Ignition Reaction Rate Model of RDX-based Aluminized Explosives under Shock Waves[J]. Acta Armamentarii, 2021, 42(2): 327-339.

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