Mean Flow and Heat Flux Analysis of Swept Shock/Boundary Layer Interactions

Mean static pressure and heat flux measurements using IR thermography are used to characterize swept impinging oblique shock/boundary layer interactions. Shock generators creating the interaction are swept back by 10°, 20°, 30° and 40° with the deflection angles adjusted to achieve the same increase in inviscid pressure coefficient normal to the shock (C_pn). This is done in an attempt to make the cases comparable and isolate the sweep influence. The incoming boundary layer is turbulent with M_∞ = 2.3. Static pressure measurements provide deeper insight into the mean flow field and the effect of sweep angle variation with constant C_pn. Heat flux measurements at varying wall temperatures are used to determine the adiabatic wall temperature (Taw) and temperature recovery factor over the interaction. Results show that Taw changes over the interaction. Local Taw values are used to calculate Stanton number. It is shown that the common assumption of a constant Taw leads to not only an absolute error but also to the Stanton number becoming dependent on the wall temperature. Finally, pressure, Stanton number and oil flow data are overlapped allowing the linking of Stanton number and surface pressure to near-wall flow features.