Abstract
A single square prism was tested at several angles of attack in a wind tunnel in smooth and in turbulent flow. A second square prism of equal size was placed upstream with various separation distances and orientations. Proper combination of signals from sensitive pressure transducers yielded the fluctuating aerodynamic forces and moments. The mean forces and moments were determined using conventional piezometer openings in conjunction with a liquid manometer. Some error is inevitable since only three transducers were used to a side. Comparisons with available information show reasonable correspondence with the mean and fluctuating forces. Little information appears available for moments. Although the upstream prism effectively shields the downstream prism in many cases, particularly for the mean forces and moments, there are in all cases, significant values for the coefficients of fluctuating force and moment. When the two objects are offset both vertically and horizontally, particularly large mean moments occur. Use of a turbulent flow field is to be recommended for testing. Consideration of moment measurement should be of prime importance in wind sensitive structures.
Published Version
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