Numerical Simulations of Deflagration to Detonation Transitions

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• Nikos Nikiforakis (Centre for Scientific Computing, Cambridge)
• Tuesday 10 November 2009, 16:30-17:30
• Martin Ryle Seminar Room, Kavli Building.

If you have a question about this talk, please contact Sally Hales.

Combustible mixtures of gases can support two steady modes of combustion, namely deflagration and detonation. Under certain conditions a relatively low speed deflagration can accelerate to form a supersonic detonation wave, a process referred to as deflagration to detonation transition (DDT). Whilst the behaviour of study deflagrations and detonations is reasonably well understood, there are many gaps in our understanding of the nature of the transition mechanism. The aim of this research is to investigate the transition process, i.e. the reasons behind the change of propagation mechanism from the advection/reaction/diffusion mode of a deflagration, to the coupled shock/reaction system of a detonation wave and in particular the role of interfacial instabilities. To this end, the effect of the Richtmyer-Meshkov instability arising from the interaction of a shock wave with a flame has been investigated. Transition to detonation is shown to take place in the neighbourhood of localised temperature perturbations (hot-spots). Finally, the character of the interim combustion-driven waves arising from these hot-spots is analysed. Aspects related to the formulation and the numerical solution (numerical schemes and adaptive mesh refinement) will also be discussed.

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