Rayleigh–Benard convection in a chemical equilibrium gas (simulation of surface detonation wave initiation)

The chemical-gas dynamic mechanisms of pulsating detonation wave instability

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...

Numerical Study of Blast Initiation of Detonation Using a Two Step Chemical Kinetics Model

The effect of chemical reactions on the blast initiation of detonation in gaseous media has been investigated in this paper. Analytical method is based on the numerical solution of onedimensional reactive Euler equations. So far, analyses on the blast initiation of detonation have modeled the combustion process as a one-step chemical reaction, which follows the Arrhenius rate law. Previous stud...

Detonation wave solutions and linear stability in a four component gas with bimolecular chemical reaction

We consider a four component gas undergoing a bimolecular chemical reaction of type A1 + A2 A3 + A4, described by the Boltzmann equation (BE) for chemically reactive mixtures. We adopt hard-spheres elastic cross sections and modified line-of-centers reactive cross sections depending on both the activation energy and geometry of the reactive collisions. Then we consider the hydrodynamic limit sp...

Numerical Simulation of Gas-phase Detonation Transmission

Planar Detonation Wave Initiation in Large-Aspect-Ratio Channels

P LANAR detonation waves are often created in narrow rectangular channels to more easily visualize the cellular structure of gaseous detonation waves [1–6]. Typically, these detonation waves are initiated from a single high-energy source requiring several kilojoules of input energy, such as a strong spark or exploding wire that creates a spherically or cylindrically expanding wave. This wave is...