Eariler measurements of boundary-layer development and transition on the contoured surface centerline of a Mach 3 two-dimensional wind-tunnel nozzle were extended to study the flow off this centerline and on the flat sidewalls. The liquid crystal method was used to visualize the surface shear stress distribution on the sidewall as a function of tunnel stagnation pressure. At the highest tunnel pressure, this method indicated high shear values spread uniformly over the sidewall; at intermediate and low tunnel pressures, a lower shear zone along the sidewall centerline was observed, bordered symmetrically by zones of relatively higher shear.
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