内聚爆轰加载下金属圆管的自由面速度测量初探

Elementary Measurement of Free Surface Velocity of Cylindrical Metal Tube Under Inward Detonation

利用不等长"刺猬"状电探针布局方法,对滑移内爆加载下金属圆管的自由面(内表面)速度历程作了探索性测量,获得了不同装药厚度下自由面粒子速度v随空间半径R的变化关系,并对结果进行了简单讨论。数据分析初步显示了装药厚度对钢管自由面粒子速度的影响;针对40mm厚硝基甲烷装药条件下实验所得的初始自由面速度v0比基于CJ理论的理论值高,用"爆压增长现象"进行了初步解释。上述工作为进一步开展内爆驱动轴对称结构运动的定量测量奠定了基础。

By using electric probe array with different lengths each other, just in the shape of hedgepig, the free surface （inner surface） velocity history of cylindrical metal tube was measured which was driven by sliding inward detonation. The relation of free surface velocity v and radius of metal tube R was obtained elementarily, and some discussions were also given. The analysis elemen- tarily reveals the influence of explosive thickness on free surface velocity, and the detonation pressure increasing phenomenon under thicker nitromethane （40 mm） condition may be the cause of bigger ini- tial free surface velocity v0 than computed value based on C-J detonation theory. The result above lays a good foundation for further quantitative measurement of the free surface velocity of axial symmetric structure under inward detonation.