WE have recently conducted wind-tunnel experiments to determine the aerodynamic drag of perforated plates at zero incidence by the wake transverse method. The plates have no protuberances, yet they are aerodynamically rough and give a drag comparable with that of plates covered with protruding roughness of the same size and spacing as the holes.
Goldstein, “Modern Developments in Fluid Mechanics” (Oxford Univ. Press, 1938).
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FRANCIS, J., MINTON, P. Aerodynamic Drag of Perforated Plates. Nature 180, 702 (1957). https://doi.org/10.1038/180702a0
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