Effect of Heating on Quiet Flow in a Mach 4 Ludwieg Tube

We report measurements of quiet-flow extent carried out in the Purdue University Mach 4 Ludwieg tube with a heated driver tube. Pitot pressure measurements are made with a fast-response pressure transducer located on the centerline. Temperature measurements are also made using a tungsten cold wire that is 3.8 μ in diameter and 0.5 mm long

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