年間 6 号発行
ISSN 印刷: 2150-766X
ISSN オンライン: 2150-7678
Indexed in
OSCILLATING AND CELLULAR STRUCTURES ON THE BURNING SURFACE OF SOLID HOMOGENEOUS ENERGETIC MATERIALS
要約
Combustion of a double-base solid nitroglycerin-based (NB) propellant at a pressure of p = 1 bar is studied experimentally. It is shown that combustion occurs in the cellular-oscillating mode: combustion occurs in the form of separate cells that periodically appear on the burning surface, move along it, and disappear. It is shown that in this mode, a carbonized skeleton is formed on the burning surface, consisting of products of incomplete decomposition of propellant. This skeleton is associated with the burning surface and plays an important role in maintaining the cellular-oscillating mode of combustion of the double-base propellant. To explain the experimental data, a combustion model with a curved burning surface is considered. It is shown that 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 (Michelson-Markstein criterion) of the burning surface becomes less than some critical value. The calculated critical value of the Michelson-Markstein criterion is in good agreement with that obtained in experiments. Using the developed model of combustion of solid homogeneous energetic materials (SHEMs) with a curved burning surface, the critical combustion diameter of various SHEMs and the shape of stationary cells on the burning surface are calculated. The critical combustion diameters of various SHEMs calculated in this way are compared with the available experimental data. A good agreement between the theory and experiments was obtained.
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