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International Journal of Energetic Materials and Chemical Propulsion
DIRECT NUMERICAL SIMULATION OF NANO AND CONVENTIONAL ALUMINUM AGGLOMERATION IN COMPOSITE SOLID PROPELLANT COMBUSTION
Sergey A. Rashkovskiy
Institute for Problems in Mechanics of the RAS
The method of direct numerical simulation of nano and conventional aluminum agglomeration in composite solid propellant combustion is developed. The method under consideration falls into three stages. In the first stage, a simulation of composite solid propellant structure is performed. An analysis of the propellant structure obtained in calculations is carried out. It is shown that the contacting aluminum particles form lengthy clusters in the propellant volume. The role of the clusters in aluminum agglomeration is discussed. In the second stage, the propellant combustion and aluminum heating in the propellant condensed phase are modeled. In the third stage of simulation, the evolution of aluminum particles above the propellant burning surface is considered. It is shown that the contacting aluminum particles form coral-like structures above the propellant burning surface. A simulation of the coral-like structures above the burning surface is carried out. The results of the numerical simulation are compared with the experimental data, obtained by high-speed digital recording of aluminized composite solid propellant combustion. A method for modeling the coral-like structure evolution under the action of gas-dynamical forces and adhesive forces between aluminum particles in the structure is suggested. Calculations of aluminum agglomeration were made. The results of calculation are dynamically represented and compared with the high-speed movies taken on combustion of composite solid propellants.
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