Abstract
Purdue University continues to develop a 9.5-inch Mach-6 Ludwieg tube for quiet-flow operation to high Reynolds number. The design, fabrication, and initial operation were reported earlier. The present paper reports progress in achieving and characterizing the quiet Mach-6 flow, and in developing instrumentation. A new design for the bleed-slot throat geometry enabled achieving some initial quiet flow, although only at very low Reynolds numbers of about 200,000. A thicker hot wire of 0.0002inch diameter is successfully surviving many tunnel runs. Preliminary measurements were obtained on the Hyper2000 generic scramjet forebody using temperature-sensitive paint. These show the development of streamwise vortices from the leading edge imperfections. These vortices become much more evident following the first compression corner, and can be generated in a controlled fashion using small roughness strips on the leading edge.
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