Three Dimensional Boundary Layer Studies As Applied To The Magnus Effect On Spinning Projectiles

Three Dimensional Boundary Layer Studies as Applied to the Magnus Effect on Spinning Projectiles

A combined theoretical-experimental study of the Magnus effect on yawed, spinning projectiles was discussed. The overall objective of this effort is to develop a method for computing Magnus effects that could be used in the design of artillery projectiles. Numerical techniques have been developed for computing: (1) the three dimensional turbulent boundary layer development over a yawed, spinning body of revolution; (2) the three dimensional boundary-layer displacement surface for an arbitrary body of revolution; and (3) the three dimensional inviscid flow field over a yawed, pointed body of completely general configuration with no plane of symmetry. The computations have been compared to experimental measurements of Magnus force and turbulent boundary layer profile characteristics. It is further emphasized that effects due to nose bluntness and protuberances such as rotating bands must be examined before the computation capability can be considered to have the full capability desired to artillery projectile design studies.

Three-Dimensional Boundary Layer Research as Applied to the Magnus Effect on Spinning Projectiles

Due to Army interest in predicting Magnus effects on artillery projectiles, the Ballistic Research Laboratories are carrying out experimental and theoretical research studies of the boundary layer on yawed, spinning bodies of revolution in supersonic flow. In this paper, computed results are shown for circumferential velocity profiles and boundary layer displacement thickness for the laminar boundary layer on a yawed, spinning cone. A comparison between computed values and experimental strain gage balance measurements of Magnus force is shown to yield encouraging agreement. Surveys of the boundary layer on a yawed, spinning tangent-ogive-cylinder model have been made at azimuthal stations completely about the circumference of the model. Measurements have also been made of wall static pressure on a yawed body of revolution. Examples of these data are discussed. (Author).

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