Two-Dimensional Simulation of Transient Detonation Process for H2-O2-N2 Mixture

By solving the two-dimensional Euler equations coupled with the chemistry, a numerical simulation of transient detonation process induced by flame for H2-O2-N2 mixture was performed, and a detailed chemical mechanism for H2-O2-N2 system, which included 19 element reactions and 9 species, was involved. A splitting operator method was used to treat separately the hydrodynamical process and chemical process in the detonation simulation. The TVD scheme was used to capture the detonation wave and the Gear algorithm was used to solve the chemical reaction. The calculated results show that combustion rate of flame can be accelerated and lead to the occurrence of detonation when the initial mole fraction ratio of the mixture is H2∶O2∶N2=0.4∶0.4∶0.2 and the initial nondimensional temperature is T/T0=5.3, the detonation wave can be propagated steadily with the detonation velocity of 2 300 m/s. The reflection of the detonation wave can be observed. In addition, the variations of species concentrations and temperature behind the detonation wave were also discussed in order to understand the inherent structure behind the detonation wave.