Research carried out from 2003-2005 at the Explosion Dynamics Laboratories at Caltech under an ONR contract has examined many issues critical to Pulse Detonation Engine (PDE) development. These include: detonation structure imaging using OH PLIF; a narrow channel facility for examining regular and irregular detonations; detonation diffraction; mechanism of soot track generation; fundamental and...

Based on a general theory of detonation waves with an embedded sonic locus that we have previously developed, we carry out asymptotic analysis of weakly curved slowly varying detonation waves and show that the theory predicts the phenomenon of detonation ignition and failure. The analysis is not restricted to near ChapmanJouguet detonation speeds and is capable of predicting quasi-steady, norma...

Accidental internal detonation waves are a common threat to the pipeline systems of petrochemical or nuclear fuel processing plants. In order to quantify the failure potential of piping structures, especially at bends, accurate detonation pressure histories are required [5]. Since detonations inhibit multi-dimensional wave structures with triple points of enhanced chemical reaction, one-dimensi...

Explosive forming is one of the unconventional techniques in which, most commonly, the water is used as the pressure transmission medium. One of the newest methods in explosive forming is gas detonation forming which uses a normal shock wave derived of gas detonation, to form sheet metals. For this purpose a detonation is developed from the reaction of H2+O2 mixture in a long cylindrical detona...

We study the detonation propagation in a channel geometry that suppresses detonation propagation in one direction, allows it in other direction, and does not create flow restrictions in the channel. The geometry consists of a series of divergent sections separated by wedges that form a sawtooth shape. Numerical simulation show that the detonation fails to propagate through this geometry in one ...

In this paper we present the result of measurement of thrust of single tube valve less Pulse detonation engine. The thrust generated by the repetitive detonation from a 48 mm inner diameter ,60 mm outer diameter and 70 cm length (various lengths of tube varies from 20 cm to 100 cm in the steps of 20 cm interval ) detonation tube was measured using load cell. Schelkin spiral was used an accelera...

In this study, Stability analysis of snow slab which is under detonation has developed in the present model. The model has been studied by using the basic concepts of non-detonation model and concepts of underwater explosions with appropriate modifications to the present studies. The studies have also been extended to account the effect of critical length variations at the time of detonation an...

In this paper, we develop a three-dimensional parallel solver using the fifth order highresolution weighted essentially non-oscillatory (WENO) finite difference scheme to perform extensive simulation for three-dimensional gaseous detonations. A careful study is conducted for the propagation modes of the three-dimensional gaseous detonation wave-front structure in a long square duct with differe...

The chemical-gas dynamic mechanisms behind the instability and failure of a onedimensional pulsating detonation wave driven by a three-step chain-branching reaction are revealed by direct numerical simulation. Two types of pulsating instability observed experimentally are explained. The first involves regular oscillations of the detonation front, where the instability is driven by low-frequency...