Self-ignition of a fuel gas upon pulsed efflux into an oxidative medium

It is demonstrated that hydrogen can exhibit self-ignition when a starting shock wave, on which the temperature increases above the stagnation temperature, appears in front of a cold expanding gas jet. This heating leads to the ignition of the hydrogen-air mixture formed at the contact surface. The results of numerical simulations show that, at a gas pressure in the vessel on the order of 300–600 bar, the intensity of a shock wave formed in air is sufficient to produce self-ignition of the hydrogen-air mixture formed behind the front of the jet of compressed hydrogen.