Abstract:
An oblique shock generated by a variable-angle wedge on the side wall
of a wind tunnel, has been used to investigate the three-dimensional
glancing interaction problem. The shock interacts with the turbulent
boundary layer growing along the side wall. Two related test programmes
have been completed using a 2.5 x 2.5 inch intermittent tunnel and a
9 x 9 inch continuous-running tunnel. For both the test programmes,
the Mach number was approximately 2.5 and the Reynolds number relative
to the wall boundary-layer thickness 5 x 10
4
. The experimental results
include oil-flow pictures, vapour-screen and smoke photographs,wall
pressure distributions, local heat transfers, wall surface temperatures
and viscous layer surveys.
The experimental results suggest that the interaction reg10n consists
of two different viscous layers between which an ordinary separation
can take place, (the double viscous layer flow-field model). The three-
dimensional separation is found to depend significantly on the pressure
rise in the direction normal to the swept shock. In this sense the
separation is similar to the two-dimensional case.
