Abstract
Computational fluid dynamics solutions of the Reynolds-averaged Navier-Stokes equations have been used to numerically simulate the reacting flow in the ram accelerator mass-driver concept. The shear-stress transport turbulence model and the eddy dissipation combustion model are also used including a detailed chemical kinetic mechanism with six species and five-step reactions. Simulations for a series of incoming Mach numbers were carried out to investigate the details of the flow field in the thermally choked combustion regime. It was found that the predicted thrust-velocity characteristics agreed well with those obtained from the one-dimensional modeling computation and the experimental measurements. The present study provides some useful results such as the influence of Mach number on length of ram accelerator combustion zone at velocities approaching the Chapman-Jouguet detonation speed.
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