Abstract
DOI: 10.2514/1.37026Instability and transition were measured on a 7-degree half-angle sharp cone at zero angle of attack. Surface-mountedheat-fluxgaugeswitha1-MHzfrequencyresponseweremountedinastreamwisearray.Experimentswerecarried out under noisy and quiet Mach-6 flow. Second-mode instability waves and their first harmonics weredetectedundernoisyflowforstagnationpressuresrangingfrom3.9to5.8bar.Underquietflow,however,thesecondmodecould onlybedetectedat8.6bar dueto themuchloweramplitude ofthefluctuations. Theamplification rateswereingoodagreementwithlinearstabilitytheoryfornoisyflow.Underquietflow,maximumgrowthratescouldnotbe determined due to the low signal-to-noise ratio.
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