Expansion of the Detonation Products of a TATB Based High Explosive: Experimental Characterization by Photon Doppler Velocimetry and High-Speed Digital Shadowgraphy
A good description of the expansion of the detonation products from a chemical explosion is of fundamental importance because it constrains the ballistic performance of the explosive.We describe in this paper an experimental study of the free expansion of detonation products of an insensitive TATB-based explosive by measuring the free surface velocity of the detonating explosive with a PDV velocimeter system. Indeed, recent experiments  have demonstrated the ability of such system to record the free surface velocity of a detonating explosive, and also potentially the detonation velocity inside the explosive just before the shock breakout, if the explosive is not entirely opaque in the near IR walelengths, which is the case of most TATB based explosives. PDV appears to be a very promising recording technique for such measurements, because it offers a good time resolution (close to 1 ns) and ability to record over very long durations which is required to measure the reaction product expansion over a large volume range. We also used digital high-speed shadowgraphy to characterize the shape and speed of the products as they release from the bare charge free surface. The results allow to give new insight into the reactions zone of TATB based high explosive. They are compared with numerical simulations performed with different reactive flow models.
KeywordsReaction Zone Direct Numerical Simulation Detonation Wave Detonation Velocity Detonation Product
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