TNT药柱水中爆炸近场压力轴向衰减规律

通过TNT药柱水中爆炸实验，建立了利用高速相机测量水中爆炸近场冲击波的实验方法，得到了药柱轴向的扫描图像，并对图像进行了数字化分析；利用Rankine-Hugoniot关系从冲击波的扫描轨迹求得冲击波阵面压力，并外推至冲击波的初始压力；用LS-DYNA计算了柱形装药近场压力沿轴向的衰减曲线；用锰铜压力传感器测量了冲击波的初始压力。研究结果表明，测试结果与计算结果比较符合，TNT药柱的近场轴向压力遵循指数衰减规律。

Axial pressure damping of cylindrical TNT charges in the near underwater-explosion field

According to an aquarium test, an experimental method was proposed to measure shock waves in the near field of an underwater explosion. The axial scanning photographs were obtained and analyzed digitally. The shock front pressure along the axle of the charge was gained from the scanning trace of shock wave by using the Rankine-Hugoniot relation, and was extrapolated to the initial pressure of shock wave. The axial pressure damping of the cylindrical TNT charges in the near field was computed by the code LS-DYNA, and the initial pressure of shock wave was measured by manganin gauges. The experimental result is consistent with the theoretical calculation, and the near-field axial pressure damping of the cylindrical TNT charges follows an exponential function.