In this paper we use recent X-ray and radio observations of the ejecta-rich Galactic supernova remnant (SNR) G337.2−0.7 to determine properties of the supernova (SN) explosion that formed this source. H I absorption measurements from the Australia Telescope Compact Array (ATCA) constrain the distance to G337.2−0.7 to lie between 2.0 ± 0.5 and 9.3± 0.3 kpc. Combined with a clear radio image of t...

We study a type Ia supernova explosion using three-dimensional numerical simulations based on reactive fluid dynamics. We consider a delayed-detonation model that assumes a deflagration-to-detonation transition. In contrast with the pure deflagration model, the delayed-detonation model releases enough energy to account for a healthy explosion, and does not leave carbon, oxygen, and intermediate...

We present an overview of the current state of detonation stability theory and discuss its implications for propulsion. The emphasis of the review is on the exact or asymptotic treatments of detonations, including various asymptotic limits that appear in the literature. The role that instability plays in practical detonation-based propulsion is of primary importance and is largely unexplored, h...

Recently, the Aerospace community has focused much of its effort on the development of micro-air vehicle technology. The treatment of problems at the micro-scale and nano-scale levels has traditionally been difficult, and one of the most challenging aspects of the design of these aircraft is the development of compact propulsion systems for them. Here, the pulse detonation engine is proposed as...

The objective of theoretical, computational and experimental studies outlined in this lecture note was to evaluate the design principles and propulsion performance of prospective air-breathing engines operating on pulse detonations of realistic hydrocarbon fuels with a realistic technique of detonation initiation via deflagration-to-detonation transition (DDT). 1.0 INTRODUCTION Activities in th...

Issues associated with modeling the multiscale nature of detonation are reviewed, and potential applications to detonation-driven propulsion systems are discussed. It is suggested that a failure of most existing computations to simultaneously capture the intrinsic microscales of the underlying continuum model along with engineering macroscales could in part explain existing discrepancies betwee...

Experiments were carried out to determine the effectiveness of a transient plasma, i.e, corona discharge, to initiate a detonation in a short tube. A high-voltage pulse generator used a pseudo-spark switch to discharge a capacitor through a transformer connected to electrodes in the combustion initiator section. The resulting voltage pulse (90 kV for 50 ns) produced a plasma discharge consistin...

Two-dimensional oblique detonation waves (ODWs) induced by finite wedges in a stoichiometric hydrogen–air mixture have been investigated numerically based on reactive Euler equations with detailed chemical reaction model. The main zone affected the expansion wave emanating from turning point of wedge is flowfield downstream intersection shock (OSW) and wave. ODW would be reduced to Chapman–Joug...

This work studies numerically the spontaneous initiation and sustenance of a detonation wave from hot spot with nonuniform initial temperature embedded within an H2O2 mixture without O3 addition. For case either no or just small amount addition, weak reaction is auto-ignited at spot, accelerates then transitions to pulsating detonation, which propagates along gradient quenches as it runs into c...

Type Ia supernovae are believed to be white dwarfs disrupted by a thermonuclear explosion. Here we investigate the scenario in which a rather low-mass, carbon-oxygen (C + O) white dwarf accumulates helium on its surface in a sufficient amount for igniting a detonation in the helium shell before the Chandrasekhar mass is reached. In principle, this can happen on white dwarfs accreting from a non...