Computations of Turbulent Boundary Layer Development over a Yawed,Spinning Body of Revolution with Application to the Magnus Effect.

摘要

Many projectiles 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 yaw. The Ballistic Research laboratory is conducting and supporting theoretical and experimental Magnus research efforts. 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; (2) three-dimensional inviscid flow calculations over a body plus boundary layer displacement surface with no plane of symmetry. Several types of experimental data, such as surface pressures, Magnus forces, boundary layer surveys, flow visualization, and skin friction, were obtained to evaluate and provide guidance to the theoretical effort. Comparison of the theory to experimental data shows the agreement to be very good. (Author)