| Popis: |
The Forest Fire explosive initiation model is useful because it can be calibrated from readily available sensitivity data. However, assumptions used in the Forest Fire derivation limit its accuracy and applicability. Present computations show that, while Forest Fire adequately predicts run to detonation for sustained-shock loading, it is grossly in error when applied to pulsed-shock loading. On the other hand, it exhibits some qualitatively correct results for finite-rate compression or ramp-wave loading. Several relatively simple modifications which extend the applicability of Forest Fire have been developed. These include improved mixture modeling, use of a higher order reactive Hugoniot to describe ignition, and incorporation of surface area burning into the reaction rate model. These modifications significantly affect the predicted response to pulsed-shock loading. Combining surface burning with a quadratic reactive Hugoniot provides a significantly improved representation of response to pulsed-shock stimulus. |
