Measurements of Turbulent Flow Structure in Supersonic Curved Wall Boundary Layers

Introduction T HE underlying physics of high-speed  ow over many of the shapes encountered on the interior surfaces of an engine are not well understood.1,2 Thus, further experimentaland related computational investigations are required to ascertain accurate predictions of the  ow dynamics. The present paper discusses the results from an experimental study that examined energy spectral data and instantaneous (10 ns) Mie-scatting  ow visualizations to quantify the effects of wall curvature on the large-scale turbulent boundary-layer  ow structures for the curved wall conŽ gurations of Ref. 3. The pressure-gradientstrength for high-speed  ow is difŽ cult to characterize.2 Luker et al.3 present a detailed discussion on pressure-strength characterization for the present curved wall models.