Numerical Simulation of Deflagration to Detonation Transition in Explosives Under Weak Ignition

Abstract

Abstract: By introducing conductive burning process into classical deflagration-to-detonation transition (DDT) model, transition process from low speed conductive burning to convective burning to detonation was proposed. Transition process in HMX granular bed with 85% loading density was simulated. Development of conductive burning, convective burning and detonation was analyzed. In early stage combustion propagation rate is very slow. It propagates no more than 0. 2mm within 8. 16ms. After onset of convective burning, it tooks 20 ms to form a steady detonation with a velocity of 8 165 m·s^-1. Time to form detonation increases with decrease of particle diameter and ignition pressure.

Key words: DDT, conductive burning, convective burning, numerical simulation

CLC Number:

DONG Hefei, HONG Tao, ZHANG Xiaoli. Numerical Simulation of Deflagration to Detonation Transition in Explosives Under Weak Ignition[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2016, 33(1): 15-22.

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