Drag and heat transfer of metal and oxide agglomerates in flow of combustion products of solid propellant

Development of tools for modeling the motion of agglomerated particles with a complex composition and shape in a flow of combustion products is of interest for problems related to the description of the motion of the condensed phase in the internal channels of solid rocket motors. An approach is developed to simulate unsteady processes that occur when a viscous incompressible fluid flows around a particle consisting of an aluminum droplet and a condensed oxide particle attached to it. Methods for taking into account the sliding of the attached oxide particle over the surface of the aluminum droplet are proposed. The computational results are used to find the drag and heat transfer coefficients of a non-spherical particle at flow velocities corresponding to the formation of separation zones. The developed model is one of the components of a more general mathematical model designed for calculating two-phase flows of combustion products and created with a multi-scale approach to simulation of two-phase flows.