Non-one-dimensional combustion modes of solid homogeneous energetic materials: An overviewстатья
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Дата последнего поиска статьи во внешних источниках: 22 декабря 2021 г.
Аннотация:It is known from theoretical analysis that under certain conditions a one-dimensional stationary combustion of solid homogeneous energetic materials (SHEMs) can lose its stability, as a result of which the burning wave becomes unsteady, and in some cases, even non-one-dimensional. In this paper, we discuss the experimental data that demonstrate combustion of SHEMs occurs incellular-oscillating mode in wide range of pressure: at the micro level (on the order of 1–5 mm), the burning surface is always covered by cells that periodically appear, move along the burning surface, and disappear. The size of the cells increases with decreasing pressure, while the frequencyof their appearance and disappearance decreases. We show that, in this mode, a carbonized skeleton is formed on the burning surface, consisting of products of incomplete decomposition of SHEMs. This skeleton is associated with the burning surface and plays an important role in maintaining the cellular-oscillating mode of combustion of SHEMs. Experimental data show that the radius ofcurvature of the burning surface within the cells is on order of the thickness of the thermal layer of condensed phase of SHEMs. This means that, in modeling of combustion of SHEMs within each cell on the burning surface, it is necessary to take into account the local curvature of the burning surface. We consider the theoretical and experimental data on combustion of SHEMs with curved burning surface, and show that according to theory, the burning rate depends on the curvature of the burning surface: with increasing curvature of the burning surface, the local burning rate decreases and combustion becomes impossible if the nondimensional radius of curvature of the burning surface becomes less than some critical value. We discuss the recent experimental studies of combustion of SHEMs with a curved burning surface in a wide range of curvature of the burning surface and compare these experimental data with theoretical dependencies. In conclusion, we discuss the role of cellular-oscillating modes of combustion and non-one-dimensional burning waves in SHEMs combustion at different conditions.