Fluidic control of a precessing axisymmetric body by near-wake coupling

The reciprocal coupled interactions between a forebody gimbaled axisymmetric bluff body, free to precess in pitch, yaw, and roll, and the body's near wake are exploited for prescribing its attitude using fluidic actuation. It was shown that closed-loop control of pitch and yaw can significantly attenuate the inherent model's baseline oscillations by more than 80%, or the control could be tuned to achieve a rapid large-amplitude response to amplify the natural yaw or pitch oscillations by more than 225% of the baseline motion. Either suppression or amplification of the natural oscillations of the model are associated with induced changes in the symmetry of the primary dynamical wake modes.