Abstract
An experimental study has been made of the effects of leading-edge geometry on the upstream influence and separated flow length scales in fin-induced shock wave turbulent boundary-layer interaction. The fins used had wedge-shaped, hemicylindrical and elliptic leading edges and were tested under adiabatic conditions at Mach 4.9. The primary objective was to determine if the length scales generated by different leading edges could be understood within a common framework. To a first approximation the normalized centerline length scales correlate with fin leading-edge drag coefficient. Attempts to correlate additional data at Mach 1.98 and 2.48 from other studies resulted in a reasonable correlation for upstream influence, but that for the separation length showed a clear influence of Mach number. The fact that the upstream influence can be reasonably well correlated in this form lends further support to the view that large-scale three-dimensional vortical separated flows of this type may be largely inviscid dominated.
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