Description of an experimental study which confirms the existence of hypersonic buzz in the separated region of a downward deflected control surface. Wind-tunnel tests in helium at M equals 17. 5 clearly demonstrated the occurrence of large-scale pressure oscillations throughout a substantial range of angles of attack and control surface deflections on a blunt slab, delta configuration. Measurements of surface pressure fluctuations and observations of high-speed schlieren photographs served to delineate the boundaries of the phenomenon and to identify the physical parameters necessary for the onset of a buzz condition.
Stasi, C., Silvestri, C., Voller, F., & Cipriani, F. (2015, September 1). Epidemiology of Liver Cirrhosis. Journal of Clinical and Experimental Hepatology. Elsevier. https://doi.org/10.1016/j.jceh.2015.06.002