水下爆炸实验法在工业炸药JWL状态方程测定中的应用研究

为了方便可靠地测定工业炸药爆轰产物的JWL状态方程，基于压导式连续电阻丝探针设计柱形装药的水下爆炸斜冲击波测量系统，对工业改性铵油炸药(ANFO)进行3组水下爆炸实验，获得其爆轰波-冲击波时程曲线；通过对二维定常流场柱形装药水下爆炸的分析，得到斜冲击波阵面的轨迹，并求解出炸药的爆压、绝热指数、水气界面夹角等参数。以水中斜冲击波阵面和水气界面夹角的实验和模拟结果作为比较对象，通过调整Autodyn有限元分析程序中的JWL方程参数，最终测定出ANFO的JWL状态方程参数。模拟结果与实验结果一致性好，其中斜冲击波波阵面的误差均小于±5%，水气界面夹角的误差在±3%以内，表明所述水下爆炸实验对于大尺度工业炸药的JWL方程参数测定合理可靠。

Research on Parameters Determination of JWL EOS for Commercial Explosives Based on Underwater Explosion Test

In order to conveniently and reliably determine the JWL equation of state (JWL EOS) for detonation products of commercial explosives, an underwater explosion measurement system with a self-developed continuous pressure-conducted velocity probe was designed for measuring the oblique shock wave induced by underwater explosion of cylindrical charge. This system was used to obtain the time history curves of detonation-shock wave front in 3 groups of underwater explosion tests of modified ammonium nitrate / fuel oil (ANFO) charge. The wave fronts were plotted, and other parameters, such as detonation pressure, adiabatic exponent, and included angle of water-gas interface, were calculated by analyzing the underwater explosion of cylindrical charge in two-dimensional steady flow field.Two-dimensional axial-symmetric model of cylindrical charge is built using Autodyn program, and the numerically simulated results of oblique shock wave front and included angle of water-gas interface are compared with the experimental results. The parameters for JWL EOS of modified ANFO are determined by test-and-error method. The simulated results are in agreement with the experimental results. The results show that the error of oblique shock wave front is less than ±5%, and the error of included angle of water-gas interface is less than ±3%. The proposed method is reasonable and reliable for determining the parameters of JWL EOS of large scale commericial explosive. Key