PBX9501炸药冲击起爆初期反应流体动力学特性研究

Reactive Hydrokinetics in the Early Stage of Shock Initiation of PBX 9501

通过简化状态方程、并假设反应速率是冲击波后时间的函数,可以得到冲击起爆反应流的解析模型。用此模型结合拉格朗日量计测量的粒子速度历史,在不知道反应速率具体形式的条件下,得到了粒子速度、压力、反应度和反应速率与冲击波波后时间的剖面,以及这些参量之间的相互关系。计算结果表明,碰撞面上粒子速度的衰减与反应程度有关,冲击波后反应速率的最大值出现在粒子速度峰值与压力峰值之间。

Through the application of Lambourn＇s CIM model, a simplified analytic method was proposed to study the post-shock reactive flow in the case of unknowing the real formula of reaction rate. Based on this method, a more reasonable empirical reaction rate can be extracted to better understand the initial hydrodynamic phenomenon during shock to detonation transition. The method assumes that reaction rate is a function of time. The history and relationship of particle velocity, pressure, extent of reaction and reaction rate can be obtained by combining with experimental particle velocity. The results show that the decrease of particle velocity on impact interface relates with extent of reaction, and peak reaction rate after shock wave appears within the peaks of particle velocity and pressure.