Experiments were carried out in the GALCIT 17 in. shock tube to investigate the effectiveness of shock enhancement on the mixing rate of a cylinder of helium gas into the surrounding air. Laser induced fluorescence was employed to trace the time development of mixing using byacetal dye to mark the helium. The concentration of helium was reduced below 20% of its initial value over 0.6 of the helium volume within less than one ms by a weak (M=1.1) shock. The results corresponded well to results of computational analysis. Details of the combustion within the vortex were investigated in large vortices, created by a pulsing technique in the Unsteady Combustion Facility. The results of this program were sufficiently promising to encourage the design, construction and test of a scramjet injector using the technique.
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