Application of free interaction theory in swept shock wave/turbulent boundary layer interactions

Fin-generated swept shock wave/turbulent boundary layer interactions were experimentally investigated via nanoparticle-based planar laser scattering method, surface oil flow visualizations, surface pressure measurements, and particle image velocimetry. Surface plateau pressure is also theoretically predicted. The plateau pressure of present quasi-conical swept shock interaction is dependent on the local skin friction coefficient and normal Mach number component, and can be predicted per a criterion deduced from free interaction theory. Visualizations and surface pressure measurements confirm that the surface plateau pressure data are equal to the pressure downstream of the separation shock; the upstream influence line is parallel to the impingement line of the separation shock on the flat plate. These observations support the free interaction theory as-applied to quasi-conical swept shock interactions.