Fluid Dynamics Analysis of Early-Stage Shock Initiation ofPBX 9501 Using Improved CIM

In this work we obtained an analytic model CIM2 for the flow field of the reaction zone of condensed explosives in early-stage shock initiation using the characteristic line, the simplified equation of state and the simplified relationship between the material impedance and the shock impedance.By choosing a single form of the reaction rate with the dissipative term, we calculated the particle velocity at different depths of condensed explosives.The CIM2 model was improved by the new hypothesis of the reaction rates at different depths, and was applied to the calculation of PBX 9501.The results show that the improvement of CIM2 can slow down the energy transport after the shock, and that the improved CIM2 can give a more exact calculation of the particle velocity of the shock and crest, the time at which the crest arrives, and the curve of the particle velocity.