The studies of the regimes of operation of the high-pressure chamber of the double diaphragm shock tube were carried out.
In the range of pressures of 1.1‑2.3 atm the cubic dependence of the time of the induction of reaction on the pressure is established at the forming of detonation in the oxyhydrogen gas in the shock tube with the diameter of 50 mm at its ignition by a nanosecond electrical spark. A peculiar mechanism of the induction period of the reaction of oxyhydrogen mixture is proposed. The effects of progressive nonequilibrium in the shock wave front and trimolecular reactions with the participation of ozone play the leading role in this case.
The nonequilibrium concentration of ozone, which is formed behind the shock wave front in oxygen in the range of the initial pressures of 0.53‑1 atm with the Mach numbers of 2.7‑2.9 is measured. The reaction rate O2+O2+O2→O3+O3 at temperatures of 686 K and 760 K is determined; the energy of the activation of this reaction is obtained.
