Numerical Simulation of Detonation Wave Damping Using a Layer of Granular Material | ||
| ERJ. Engineering Research Journal | ||
| Article 4, Volume 25, Issue 2, April 2002, Pages 43-58 PDF (714.33 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/erjm.2002.70645 | ||
| Author | ||
| Ahmed A. Sileem | ||
| Dept. of Mech. Power Eng. Faculty of Eng., MinuJiya University, Shebin El-Kom, Egypt. | ||
| Abstract | ||
| Damping or quenching of detonation wave is of great importance for safety of people, buildings, factories of chemical industries and equipment. In the present paper a layer of granular material is used to achieve this purpose. The main function of this layer is to absorb substantial part of both momentum and energy of the wave. Eventually, the detonation wave is extinguished and the pressure intensity is diminished. A model is given for drag force and heat transfer exchange between gas and solid particles. The detonation wave is initiated in a stoichiometric methane-air mixture at one end of a detonation tube. A layer of granular material is attached to the other closed end. The particles and the reactive mixture in the layer form a two-phase mixture that is initially at rest and in thermodynamic equilibrium. The dynamics in the entire domain following the collision of the propagating detonation front with the gasllayer interface is investigated. The void fraction of the granular layer is assumed constant (i.e. the particles velocity is zero). The chemical reaction is assumed to be one-step reaction of Arrhenius type. The unsteady governing equations in one-dimensional domair, are solved numerically. The effects of solid particle diameters, specific heat and the void fraction variations on detonation damping are found. The results show that considerable decay of detonation occurs immediately at the gadlayer interface. The decay continues along the layer until the wave is completely died out. The distance after which the wave dies out was found to decrease with the decrease of solid particles diameter and the void fraction and the increase of solid particles specific heat. The reflected shock wave (retonation) from the gasllayer interface propagates unsteadily backward and it is reflected from the closed end of the tube to strike the gadlayer interface again. The transmitted part of the latter wave dies out quickly inside the granular layer. | ||
| Keywords | ||
| Detonation waves damping; granular layer; two-phase flow of gas and solid particles; numerical solution | ||
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