Abstract
Many projectiles used by the Army are slender bodies of revolution which are launched at high spin rates. Magnus forces and moments are generated by the distorted boundary layer which results from a spinning body at angle of yaw. This paper reports the results of a combined theoretical-experimental research effort to develop a method for computing Magnus effects that would be useful in the design of artillery projectiles. The theoretical effort involves: 1) numerical calculation of the fully three-dimensional boundary layer with the added complication of interaction between surface spin and cross flow velocity; and 2) three-dimensi onal inviscid flow calculations over a body plus boundary-layer displacement surface with no plane of symmetry. Experimental measurements of turbulent boundary-layer profile characteristics, wall static pressure, and aerodynamic forces have been obtained to evaluate and provide guidance to the theoretical effort. Comparisons between the theory and the experimental data indicate very close agreement and substantiate the validity of the theoretical approach.
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