Gas dynamics aspects of nanoaluminum use for high energy systems

In the paper, based on mathematical modeling of the two-phase flow in high energy systems, the gas-dynamic two-phase flow pattern and levels of losses of specific impulse for the biphasity has been analyzed depending on the particle size distribution function at the nozzle inlet. The function was specified using experimental information on the combustion of the studied compositions with partial replacement of the dispersed aluminum by nanodispersed aluminum. The calculations were performed under different conditions (pressure in the combustion chamber, weight fraction of condensate, and minimum diameter of the nozzle) in the quasi-one-dimensional and axisymmetric approximations and taking into account coagulation, crushing, and rotation of the condensate particles. To describe the processes of coagulation, the model of “tagged” particles and polydisperse fragment model was used. It is shown that the flow pattern and the level of loss in the specific impulse for biphasity are different in the cases of two-modal and one-modal particle size distribution functions at the nozzle inlet. The processes of coagulation for the two-modal function occur more rapidly, and the level of two-phase losses upon varying the proportion of nanodispersed aluminum, all other things being equal, remains almost at the same level.