The paper defines and describes blast waves, their interaction with a structure and its subsequent response. Explosions generate blast waves, which need not be due to explosives. A blast wave consists of two parts: a shock wave and a blast wind. The paper explains how shock waves are formed and their basic properties.The physics of blast waves is non-linear and therefore non-intuitive. To under...

The results of experimental studies during which transition to detonation events occurred are presented. These observations and their interpretation are then discussed, and the conditions for the onset of detonation are described, with particular attention paid to the nature of the phenomena of deflagration-to-detonation transition. The resulting implications for predicting detonation evolution...

An experimental study on pulse detonation engine (PDE) is conducted using hydrogen/air mixtures. Several key issues for PDE development, including valve operation, injection, mixing, filling, cycle repetition, ignition timing, DDT distance and propagation of detonation/quasi-detonation, are investigated. The fuel and oxidizer are injected into PDE from opposite sidewall directions to be well mi...

A novel multi-mode implementation of pulsed detonation engines is investigated in this paper. The various modes in this proposed concept are (as illustrated in Fig. [1]): (1) An ejector augmented pulse detonation rocket for take off to moderate supersonic Mach numbers (2) A pulsed normal detonation wave mode at combustion chamber Mach numbers less than the Chapman-Jouguet Mach number, (3) An ob...

A rotating detonation engine displays complex nonlinear shock front propagation dynamics which impede effective dimensionality reduction. novel optimization is used to discover separate low-rank modes and interpretable for each front's propagation. Koopman autoencoders similarly enable separation forecasting of wave interactions.

The feasibility of using preheated kerosene and pre-evaporation to assist in liquid detonation ignition self-sustaining combustion under near-ramjet limit conditions was investigated. Additionally, the decoupling mechanisms were analyzed depth. Owing forced heat transfer effect supersonic flow on droplets, could not be achieved alone. wave still decoupled due exchange cold droplets wave, even i...

Peter Diakow Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Canada Synopsis Dimethyl-ether (C2H6O) a common hydrocarbon is increasingly being used as a transportation fuel and as an aerosol propellant, very limited explosion safety data is available for this fuel. Experiments were performed to determine the detonation characteristics of dimethyl-ether air mixt...

The Deflagration to Detonation Transition (DDT) in large arrays (100s) of explosive devices is investigated using large-scale computer simulations running the Uintah Computational Framework. Our particular interest is understanding the fundamental physical mechanisms by which convective deflagration of cylindrical PBX 9501 devices can transition to a fully-developed detonation in transportation...

Detonation velocity is an important parameter for explosive, and it is crucial for many fields such as dynamic chemistry burn models, detonation propagation prediction, explosive performance estimation, and so on. Dual-channel detonation velocity measurement method and system are described. The CFBG sensors are pasted both on the surface and in the center of the explosive cylinder. The length o...

Oblique detonation wave (ODW) reflection on the upper wall leads to a sophisticated complex, whose stability is critical application of oblique engines. The unstable complex characterized with continuous moving Mach stem has been observed, but corresponding re-stability adjusting method still unclear so far. In this study, cowl-induced expansion based model an upper-side introduced, and ODW dyn...