Published online by Cambridge University Press: 30 July 2014
This paper uses measurements of surface heat transfer to study roughness-induced turbulent wedges in a hypersonic boundary layer on a blunt cylinder. A family of wedges was produced by changing the height of an isolated roughness element, providing conditions in the following range: fully effective tripping, for the largest element, with a turbulent wedge forming immediately downstream of the element; a long wake, in length several hundred times the boundary layer thickness, leading ultimately to transition; and retention of laminar flow, for the smallest element. With appropriate element size, a fully intermittent wedge formed, comprising a clear train of turbulent spots.
 $M=7.6$
                     
                  
               . AIAA J. 
               10, 1387–1388.CrossRefGoogle Scholar
                        $M=7.6$
                     
                  
               . AIAA J. 
               10, 1387–1388.CrossRefGoogle Scholar $5^{\circ }$
                  
                cone in the T4 shock tunnel. Res. Rep. No. 2001-2. University of Queensland.Google Scholar
                     $5^{\circ }$
                  
                cone in the T4 shock tunnel. Res. Rep. No. 2001-2. University of Queensland.Google Scholar $10^{\circ }$
                     
                   cone,
                        $10^{\circ }$
                     
                   cone, 
                     
                         $M_1 = 9.1\text {--}16$
                     
                  
               . AIAA J. 
               7, 1245–1252.CrossRefGoogle Scholar
                        $M_1 = 9.1\text {--}16$
                     
                  
               . AIAA J. 
               7, 1245–1252.CrossRefGoogle Scholar $M = 5.5$
                     
                  
               . AIAA J. 
               5, 899–906.Google Scholar
                        $M = 5.5$
                     
                  
               . AIAA J. 
               5, 899–906.Google Scholar