Solid fuel ramjet simulator results - Experiment and analysis in cold flow

This paper presents laser-based experimental results and analytical results on two-dimensional backwardfacing step flows with mass injection from the bottom wall behind the step. The facility simulates the flowfield in the flame stabilization region of a solid fueled ramjet. Measured are two components of velocity and shear stress with and without secondary air injection. The same quantities are calculated for foreign-gas injection. The most notable effect of blowing, both experimentally and analytically, is the appearance of a second recirculation zone. Analytically and experimentally, it is found that the general size of the main recirculatory region diminishes with increased blowing rate and that blowoff of the recirculation zone can occur at relatively low blowing rates. This indicates that flame stabilization may be strongly affected by the actual blowing rate in a solid fuel ramjet (SFRJ).