An experimental study of shock transmission from a detonation tube

An experimental evaluation of the transmission of shock waves from a detonating gas mixture in a 0.5-in-inner-diameter open-ended tube into an inert atmosphere is described in this paper. Stoichiometric H-2/O-2 at 1 atm was used as the reactive gas medium. Results from in-tube diagnostics indicated successful deflagration-to-detonation transition (DDT), which leads to an overdriven detonation before exiting the tube at near Chapman-Jouguet (CJ) conditions. Out-of-tube diagnostics characterized the transmission of the shock wave into the surrounding environment, where the shock wave decays into an acoustic wave as it travels away from the tube exit. A mathematical treatment of overpressure and time-of-arrival data allowed for a direct analytical description of the transmitted shock wave's transient velocity. This description is combined with a first-principles gas-dynamics treatment of the moving normal shock wave to describe the conditions behind the attenuating shock wave. This work furthers the understanding of shock transmission from an open-ended detonation tube and provides a theoretical framework to estimate the resulting conditions.

Automated summary

This paper describes an experimental evaluation of shock wave transmission from a detonating gas mixture in an open-ended tube into an inert atmosphere. The results show the successful deflagration-to-detonation transition and the formation of a transmitted shock wave. The study also characterizes the transmission of the shock wave into the surrounding environment and the conditions behind the transmitted shock wave.