Abstract: Effectiveness of the fast-swinging micro-tip-strake technique for contr olling forebody vortex asymmetry athigh angles of attack has been investigated and developed in low-speed wind tunnel exper iments on a slender body ofr evolution with pointed nose configuration. At high angles of attack ( A> 25b), the new method was effective in suppressing side force to zero level with only very small energy input, demonstrating the leveraging available throughcontrolling the vortex flow field at the point of instability. T he cross plane flow field on the lee-war d of the forebodywere measured by seven hole probe, and the vorticity map and the total pr essure coefficient contour map revealed thesymmetr ic vortex state under the unsteady micro perturbat ion control.

Key words: flow control, forebody asymmetric vortices, unsteady perturbation, slender bo dy, high AOA, flow field measurements