Detonation Parameters of Mixtures Produced by Injecting Gaseous Components into the Shaft of a Pulse Gas Detonator
I. S. Batraev, D. K. Rybin, V. Yu. Ul'yanitskii
Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: gas detonation, detonation parameters, cellular structure of the detonation front, acetylene, ethylene, propylene, methylacetylene-allene fraction (MAF), MAPP gas
Abstract
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.
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