Abstract
SummaryAn investigation of channel wall interference with the object of verifying experimentally the accuracy of the results given by the theory developed by Prandtl and extended by Glauert. Tests were made, with cylinders and aerofoils, using the “ mirror ” method, for some ten different channel sizes. The results show :1.The presence of the channel walls results in an increase in the drag of a symmetrical body, such as a cylinder.2.Agreement with the theoretial corrections for incidence and drag for channels of reasonable size.3.The extent and nature of the wall interference effects on the aerodynamic characteristics of aerofoils in much restricted streams, beyond the limits of applicability of the theory.
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