180°圆弧形钝感炸药的爆轰波传播

摘要

Non-ideal detonation wave propagation in 180° ribs of an insensitive high explosive is studied using the DSD (Detonation Shock Dynamics) method which is combined with the LS (Level Set) method in body-fitted coordinate. The rule of detonation wave propagation in 180° explosive ribs is obtained through comparing and analyzing the computed and experimental results. The explosive ribs can detonate in steady state regime,and in this case the detonation front is steady as viewed in a system of polar coordinates rotating with a fixed angular velocity. The shape and angular velocity of this steady front is independent of the outer radius of the rib. The formation of steady-state regime depends on the rib dimensions and the material of the shells covering the rib edges. Some experimental formulae describing the detonation front propagation in explosive ribs are also studied. It is shown that the change of detonation wave velocity can be accurately described by these experimental formulae, which have reference value for experimental measurement and estimation.%采用贴体坐标下与Level Set方法相结合的爆轰冲击波动力学(DSD)计算方法,研究了180°圆弧形钝感炸药中非理想爆轰波的传播过程.通过数值模拟计算和实验测量的对比分析,得到了180°圆弧形炸药中爆轰波传播的一些规律:圆弧形钝感炸药可以实现定常爆轰,即在极坐标中整个爆轰波以固定角速度转动.这种定常阵面的形状和角速度与圆弧的外半径无关,定常体系依赖于圆弧形炸药的内半径和覆盖圆弧的外壳物质.对描述圆弧形炸药中爆轰波传播规律的经验公式进行了研究,结果表明这些经验公式能够准确描述爆轰波速度的变化,在实验测量和预估方面具有一定的参考价值.