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The tube for spontaneous detonation (Institute of Technical Physics, Russian Federal Nuclear Center, Snezhinsk) was used to study the initiation and development of detonation in propane-air mixtures under injection of hot detonation products into them. The full picture of this phenomenon was recorded: the injection of hot detonation products into the main tube of the facility with the formation of a mixture of the starting propane-air composition with the hot products; the initiation of a local explosion in this mixture and the subsequent development of a detonation in it; detonation transfer to the region of the cold starting reactants (or detonation failure at the interface). The detonation was found to exist for an initial volume concentration of propane of 3.3 to 5%. The following critical (by the moment of the local explosion) parameters were determined: a mass fraction of hot detonation products of 6-9%, an energy input density due to product injection of 145-195 J/g, and an input energy power of 70-50 J/(g · msec).

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Results of explosive experiments are presented with time-resolved and space-resolved diagnostics of free surface velocity profiles of wedge samples by optical lever method. The objective of this work is to record free-surface velocity dispersion of samples made of high purity iron with fine and coarse grains, as well as 30KhGSA steel, in delivery state and hardening up to HR c 50. It is demonstrated, that the value of velocity dispersion of free surface of the samples under identical loading modes is varied according to initial microstructure and grain size of investigated metals.

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