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Showing 1 to 14 of 14 for “"Detonation Velocity"”.
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Detonation shock and ignition dynamics in condensed phase explosives
We investigate the ignition and dynamics of detonation waves in condensed phase explosives using direct numerical simulations and asymptotic analysis. We develop a model to simulate deflagration to detonation transition in pentaerythritol tetranitrate powders. The model uses a continuum mechanics …
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Synthesis, Characterization, And Properties Of Peroxo-Based Oxygen-Rich Compounds For Potential Use As Greener High Energy Density Materials
… sensitivities, low thermal stabilities, and low detonation velocities they have not found any civil or military HEDM applications. </p> <p> In this dissertation research, we have synthesized and fully characterized four categories of peroxo-based compounds: tert-butyl peroxides, tert-butyl peroxy …
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STRUCTURE AND PROPERTIES OF NOVEL ENERGETIC COORDINATION COMPLEXES AND THEIR POTENTIAL AS MAGNETICALLY SWITCHABLE EXPLOSIVES
… properties such as high energy density, detonation velocity, and detonation pressure. Such materials must also be insensitive to physical initiation stimuli such as impact, friction, electrostatic discharge, and heat to allow for the safe synthesis, transportation and storage of the …
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Fluidic Jet Turbulence Generators for Deflagration to Detonation Transition in Pulsed Detonation Combustors
… the turbulent deflagration flame front to detonation velocity in the shortest possible distance while using a single Jet in Cross Flow (JICF). Jets in crossflow, depending on orientation and momentum ratio, can induce two types of flow structures that propagate downstream; vortex filaments …
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The dynamics of multi-dimensional detonation
… theory is presented for the dynamics of detonation when the radius of curvature of the detonation shock is large compared with the one-dimensional steady Chapman-Jouguet (CJ) detonation reaction-zone thickness. The analysis considers additional time-dependence in the slowly-varying …
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Analysis of the Mechanically Choked Ram Accelerator
The ram accelerator is a hypervelocity launch concept which uses a ramjet-like propulsive cycle to accelerate a projectile to hypersonic velocities. Research surrounding this technology has thus far been primarily focused on the thermally choked mode of operation, which relies on acceleration to …
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Instability of steady and quasi-steady detonations
… and dynamic behavior of steady and quasi-steady detonation theories are investigated through linear stability analysis and numerical simulation. A general, unsteady, three-dimensional formulation of the reactive Euler equations in a shock-fitted reference frame is derived. The formulation is …
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Investigating detonation fronts in small explosive charges using a wave shaper
Understanding detonation front curvature is critical to the successful exploitation of the power of explosives. Changing the detonation front from a diverging spherical wave to a more complex shape allows for substantial increases to the detonation velocity and pressure above the Chapman-Jouguet …
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Initiation and Growth of Reaction in LLM-105
… for two new LLM-105 formulations with respect to detonation velocity and growth of reaction within the explosive. The results showed that fine particle size LLM-105 has a shorter run distance to detonation than coarse, which is likely caused by the number of potential hot-spot sites available in …
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Determining the Reaction Zone Length in Shock Initiated PETN
… sugar with comparable particle size. The shock velocity and rise time were found to exhibit dependence on the thickness of the bed, suggesting that these effects may also play a role in PETN prior to development of detonation. A fibre launched laser flyer detonator system was constructed to …
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Novel Approach for Computational Modeling of a Non-Premixed Rotating Detonation Engine
Detonation cycles are identified as an efficient alternative to the Brayton cycles used in power and propulsion applications. Rotating Detonation Engine (RDE) operating on a detonation cycle works by compressing the working fluid across a detonation wave, thereby reducing the number of compressor …
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Influence of Fuel Inhomogeneity and Stratification Length Scales on Detonation Wave Propagation in a Rotating Detonation Combustor (RDC)
The detonation-based engine has the key advantage of increased thermodynamic efficiency over the traditional constant pressure combustor. These detonation-based engines are also known as Pressure Gain Combustion systems (PGC) and Rotating Detonation Combustor (RDC) is a form of PGC, in which the …
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Characterization framework to develop ball-milled thermites as additives to polymer-bound explosives
… release that governs fast phenomena such as detonation and deflagration. In many formulations, the sluggish oxidation of Al can even interfere with the primary decomposition chemistry of explosives, leading to reduced detonation velocity and peak pressure. To address these limitations, …
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Numerical Modelling of Detonation and Ignition of Condensed Phase Explosives
… verify models which describe both ignition and detonation of explosives. The objective of this work is to improve the robustness and accuracy of numerical simulations of both ideal and non-ideal explosives. Much of the complexity of the detonation phenomenon arises due to the finite width of the …