Abstract
The Background Oriented Schlieren (BOS) technique is a method that has been developed recently for easily and inexpensively visualizing density gradient variations in compressible flows. In this paper, the application of this technique in the T4 free-piston reflected shock tunnel is presented. The BOS technique was used during three test campaigns to qualitatively visualize the flow over scramjet models and components of scramjets. The results demonstrate that a simple optical arrangement, that does not include high quality windows in the test section and model, can be used to detect the locations of shock waves, expansion fans and shear layers. At present, the resolution and quality of the images is not as high as can be achieved using conventional schlieren techniques.
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