Fluorescence imaging is used to investigate the separated flow upstream of
a blunt fin in a hypersonic freestream with a transitional boundary layer.
Images are presented to show the how development before, during, and after
the test time of the free-piston shock tunnel used to generate the how Thes
e images indicate that the test time in this facility is long enough to ach
ieve a steady how over the blunt fin. Thermocouple measurements are include
d to compare the surface heat flux upstream of the fin with that for flow a
long a flat plate with the same freestream conditions. The heat flux result
s are consistent with separation in a transitional boundary layer and show
that the separated dow is oscillatory.