Experimental investigation of agglomeration during combustion of aluminized solid propellants in an acceleration field

Abstract

Agglomeration during combustion of solid rocket propellants in an acceleration field up to 60 was studied experimental. In the experiments, the acceleration direction and magnitude were varied. The amount, chemical composition, and particle size of the agglomerates and the structure of the surface layer were determined as functions of the acceleration magnitude and direction. The most significant feature of the effect of tensile accelerations is an increase in the agglomerate mass to a certain limiting value, and that of compressive accelerations is the formation of a layer of condensed products on the burning-propellant surface. The data obtained provide a deeper understanding of the general physical picture of agglomerate formation and aluminized-propellant combustion and highlight the range of engine operation problems under flight conditions due to the presence of condensed combustion products.

Analysis and synthesis of solutions for the agglomeration process modeling

“…The mass of metal of agglomerates in conditions of tensile accelerations grows, reaching some limit- ing value. This is because accelerations a¨ect on duration of evolution process [40]. As a result of the evolution on the surface of burning propellant, the agglomerates of di¨erent types are formed.…”

“…If tensile accelerations exceed some limiting value, then duration of evolution is negligible, and chemical composition of agglomerates corresponds to the ratio between metal and oxide in the SL. It is shown that in the absence of accelerations, up to 25 %(mass) of metal in agglomerating particles burn in gas-phase mode at their evolution [40]. Thus, it was assumed that at zero accelerations, evolution duration at realization of the ¤pocket¥ mechanism is determined by the time needed for burnout of 25 %(mass) of metal.…”

بررسی تجربی اثر اسپین بر نرخ سوزش پیشرانه ی کامپوزیت دارای ذرات آلومینیوم

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