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The propagation of the filtration—diffusion combustion front deep in a bulk of titanium powder in a nitrogen medium is studied experimentally. The dependence of the combustion–propagation depth on the height of a fill of titanium powder and the pressure of gaseous nitrogen, the effect of degassing impurities on the limit, and some specific features of combustion are revealed. A model of the process by means of which a formula for estimation of the burning–out depth of the fill is derived is proposed.

1.A parameter determining the development of the initiation process with an arbitrary level of heat losses for narrow and broad reaction zones in interacting systems has been Found.2.The possibility of change in the condition of initiation with variation in the heat losses has been demonstrated.3.It has been shown that the development of the initiation of heterogeneous systems is determined by parameters corresponding to a maximum of the heat-liberation rate function. The role of zones of complete combustion in the subsequent development of the transient conditions has been noted.4.The possibility, in principle, of selecting a transient system such as to eliminate extinction at the boundary within the composite charge has been proven.

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