ABSTRACT

Underwater explosion test has been proven to be a simple way to measure the equation of state of detonation products. In order to further develop this technology, a new method for determining Jones-Wilkins-Lee equation of state (JWL-EOS) by underwater explosion test with spherical charge was designed based on the self-developed pressure-conducted velocity probe in this paper. First of all, we established an experimental system for the measurement of near-field shock wave of spherical charge using the novel probe, which made it possible to continuously record the velocities of detonation wave and shock wave in a given direction. Four field tests were performed using powdery cyclotrimethylene trinitramine (RDX) and the time history curves of detonation-shock wave front were obtained, by which we determined the velocity of detonation (VoD) and initial shock wave velocity. Besides, the detonation pressure was calculated applying impedance matching technique based on interface continuity conditions and acoustic approximation. We also analyzed the attenuation law of peak pressure of near-field shock wave by fitting the full-scale shock wave data. Applying numerical calculation and test-and-error process, we adjusted the six JWL-EOS parameters (A, B, C, R₁, R₂, and ω) constantly to make the error between numerical and experimental attenuation coefficients of peak pressure of shock wave fall within ±1%. Finally, the JWL-EOS parameters of powdery RDX of each test were determined, and the adiabatic curves of pressure versus relative volume were plotted as well.

摘要

水下爆炸试验已被证明是一种测量爆轰产物状态方程的简单方法。为进一步发展该技术，本文在自行研制的压力传导速度探头基础上，设计了一种球状装药水下爆炸试验确定Jones-Wilkins-Lee状态方程(JWL-EOS)的新方法。首先，我们建立了使用新型探头测量球形装药近场冲击波的实验系统，可以连续记录给定方向的爆轰波和冲击波的速度。使用粉状环三亚甲基三硝胺（RDX）进行了四次现场试验，得到了爆轰-冲击波前的时程曲线，我们通过它确定了爆炸速度 (VoD) 和初始冲击波速度。此外，基于界面连续性条件和声学近似，应用阻抗匹配技术计算爆轰压力。我们还通过拟合全尺度冲击波数据，分析了近场冲击波峰值压力的衰减规律。应用数值计算和测试和误差过程，我们调整了六个 JWL-EOS 参数（A、B、C、R ₁、R ₂和ω ) 不断使冲击波峰值压力衰减系数的数值与实验误差在±1%以内。最后确定了各试验粉状RDX的JWL-EOS参数，并绘制了压力与相对体积的绝热曲线。