Abstract:
An
experimental investigation has been performed into the
effects
of leading edge bluntness and sweep on the mean flow
characteristics of a
glancing shock wave turbulent boundary layer
interaction. A series of blunt un swept shock generators (ranging
in
leading edge diameter from O to 1.0 ins) and a series of sharp
swept generators (covering angles of sweep from 0 to 75°) were
tested at incidences up to 30° at a Mach number of 2.4 and a
free stream Reynolds number of 2.6 x 106 m 1.
The results obtained, using a combination of oil flow
visualisation, static pressure measurements, schlieren photography
and
vapour screen visualisation, indicate that existing flow field
models can be extended to
include the more general configurations _
tested.
Leading edge diameter was found to be the major parameter
controlling the scale of the interaction produced by the blunted
models, with model incidence playing a secondary role, even at large
distances from the
generator. Existing methods for predicting the
scale of the
un swept sharp generator flow field are shown to provide
a reasonable estimate of the variation of upstream influence with
Reynolds number.
