Detonation-diffuse interface interactions: failure, re-initiation and propagation limits

Abstract

Two-dimensional simulations of detonation interaction with gravity-driven diffuse interfaces, separating reactive mixtures and inert gas, were performed using the CLEM-LES methodology. The dynamics of the interactions were characterized and detonation failure and re-initiation mechanisms were described. Triple point transmission seems to be a characteristic feature of these configurations, and is responsible for both, quenching and re-ignition, within the diffuse interface. Results show that regions where the interface is thicker yield lower critical cell size gradients and vice versa. The average critical gradient found for the cases considered is 0.54, higher than the value of 0.1 reported in literature. The extension of the limit appears to be a direct consequence of the cellular dynamics within the diffuse interface.