Research On The Energy Release Law Of Aluminum-containing Explosives

This paper focuses on aluminized explosive energy release in the confined space,this dissertation has made a systematic research of energy release of aluminized explosive in confined space and detonation performance by theoretical analysis,the detonation heat test and experiment study.The main research contents and results are as follows:Through theoretical analysis and calculation,the explosion heat,the detonation heat,the afterburn heat and the combustion heat,four energy release parameters and three stages reaction mechanism have been proposed.According to the reaction characteristics and reaction stages,the energy release of aluminized explosives under different conditions was distinguished.In order to improve the calculation accuracy of the detonation heat of CHNO explosives and aluminized explosives,a suit of new empirical method was established,and the influence factors of detonation heat were computationally studied.Through the adiabatic calorimetric bomb,the effects of aluminum powder content,RDX/AP ratio and atmosphere environment on the detonation heat release of aluminized explosives were analyzed in HMX/Al and RDX/A1/AP two systems,and the detonation products of HMX/Al explosive were collected and analyzed.The results show that when aluminum content is from 10%to 40%.the detonation heat increases with the increase of aluminum content.When the quality of aluminum powder is 32%,the RDX/AP ratio is about 1.1 is more appropriate.The atmosphere environment had a significant effect on the energy release of aluminized explosives,the heat under 0.1 MPa air environment increased by 20%compared to the 0.1 MPa nitrogen environment.The detonation parameters and the gaseous product composition of HMX/A1/WAX 85/10/5 and HMX/Al/WAX 75/20/5 were experimentally studied and theoretically analyzed by GC and VLWR thermodynamics program.It shows,the reactivity of the aluminum powder is 94.9%and 89%in experment,When the aluminum content is from 10%to 20%,the hydrogen and carbon monoxide contained were increased with the aluminum content increased.The VLWR thermodynamics program calculates the detonation velocity and the detonation pressure of aluminum explosives by assuming that the aluminum powder reactivity is 30%.However,about 60%aluminum powder reacted after the reaction zone and the release heat can be measured by the adiabatic calorimetric bomb.It shows that the aluminum powder participates in the detonation reaction both in the reaction zone and after the reaction zone.The aluminum content impact on the energy release of HMX/Al explosive under static detonation in confined space was studied by experiment and numerical simulation,the laws of overpressure,impulse of shock wave and aluminum powder secondary reaction rate were analyzed.The result shows that with aluminum content increase from 10%to 30%,the impulse of shock wave was increase and overpressure was decreasd.The numerical simulation of HMX-4 shock wave propagation has been carried out by using the AUTODYN hydro-coeds,the numerical simulation result shows that the shockwave curve is in good accord with the experimental result,ant the second reaction rate equation in the JWL-Miller EOS can reasonably describe the combustion characteristics of aluminized explosive.