Further Investigations of Adaptive-Wall Wind Tunnels

Abstract : The objective of this investigation was to continue the assessment of the Calspan perforated-wall, segmented-plenum adaptive-wall wind tunnel for flows in which the tunnel walls are supercritical. An important aspect of the investigation was the development of a static-pipe measuring technique for determining the normal velocity distributions. This technique was developed to overcome the limitations on the number of flow-angle probe measurements that could be made in the Calspan tunnel. The flow about a static pipe in the presence of model/wall-induced disturbances was analyzed within the framework of slender-body theory to give the relationship between differential pressure measurements across the pipe and the steam-wise derivative of the normal velocity at the pipe centerline.