Particle Simulation of Detonation in Microchannel

Abstract

Direct simulation Monte Carlo (DSMC) method was applied to numerical study of detonation in an H2/O2 mixture with detailed chemical kinetics on the basis of effective DSMC molecular chemistry models. The process of homogeneous adiabatic autoignition of a stoichiometric H2/O2 mixture diluted by argon was simulated by the DSMC method. The modeling results provide a qualitatively correct description of autoingition process and are in good agreement with the numerical solution of equations of chemical kinetics. The results of the DSMC modeling of an unsteady detonation wave yield the velocity of detonation, which coincides with the Chapman-Jouguet velocity. The internal structure of the detonation wave obtained in the DSMC simulation is in good qualitative agreement with the detonation-wave structure calculated on the basis of the Zeldovich – von Neumann – Doering (ZND) theory.