Measurements of surface-pressure and wake-flow fluctuations were made as part of a transonic wind-tunnel investigation into the detailed nature of a Whitcomb type supercritical airfoil flow field. Emphasis was on a range of high subsonic Mach numbers and moderate lift coefficients corresponding to the development of drag divergence and buffeting. Fluctuation data were analyzed statistically for intensity, frequency content, and spatial coherence; variations in these parameters were correlated with changes in the mean airfoil flow field.
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