Inhibition of developed detonation of a hydrogen-air mixture by a small additive of a hydrocarbon inhibitor

The influence of a relatively small additive of unsaturated gaseous hydrocarbon (propylene) on the detonation wave dynamics in a stoichiometric hydrogen-air mixture was studied by numerical simulation. The influence of the propylene concentration on the development of detonation in the mixture caused by direct initiation with an energy input from the outside in a small volume in a short time was studied at different initial temperatures of the mixture. A detailed mechanism of hydrogen combustion and key propylene hydrogenation reaction were used. Propylene is readily hydrogenated with the removal of atomic hydrogen from the reaction chain. This leads to an increase in the self-ignition delay of the mixture behind the leading shock wave, and at a sufficient concentration of the inhibitory additive, to the decomposition of the cellular detonation wave structure and detonation degeneration.