Characteristics of flow over inclined bodies of revolution

Julian H. Allen, Edward W. Perkins
Mar 1951

Experimental force, moment, and center-of-pressure variations for a large number of bodies of revolution have been compared with the calculated characteristics based on the approximate theory developed in NACA-RM-A9I26. The bodies varied in fineness ratio from 4.5 to 21.1, from blunt unboattailed bodies to airship hulls, and the experimental results are given for widely varying Mach number ranges of angle of attack. It is shown that the lift and drag characteristics are fairly accurately predicted by the theory but that the actual center of pressure is more rearward than the theory indicates. Experimental pressure distributions and visual-flow studies which have been used to investigate the characteristics of the cross flow for inclined bodies of revolution have demonstrated that the development of the cross flow with distance along the body on a long body of constant about a circular cylinder impulsively started from rest. This factor assists in explaining the observed differences between center-of-pressure location determined from experiment and that calculated using the approximate theory.

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