Detonation parameters of mixtures produced by injecting gaseous components into the shaft of a pulse gas detonator

A CCDS2000 detonator for acetylene, ethylene, propylene, and a multicomponent methylacetylene-allene fraction (MAF) propellant is used to perform experiments on measuring the detonation rate and recording a detonation front cell in a tube 26 mm in diameter and 2 m in length. The experiments are carried out at atmospheric pressure in stoichiometric mixtures diluted by nitrogen to air concentrations and in air-propellant mixtures with a varying propellant content in them. In the case where the explosive mixture components are fed as a flow by stratifying an explosive charge in an initiation zone, a self-sustaining detonation is stably excited up to limiting (spin) regimes. The concentration limits of the detonation existence are determined. In the propellant-air mixtures of acetylene and ethylene, as the values become lower than the limits, there is multifront detonation. For propylene and MAF, a tube diameter of 26 mm is near-critical: only one- and two-headed spin is observed in the entire range of existence. Calculation results are in good agreement with the experiment.