Static and Dynamic Flow Visualization Studies of Two Double-Delta Wing Models atHigh Angles of Attack

摘要

A water tunnel flow visualization was performed to study the vortex developmentand bursting phenomena on a baseline double delta wing model and a modified double delta wing model. The primary focus of this study was two-fold: First, to study the static and dynamic effects or pitch and pitch rate on the vortical flowfield of the individual models. Second, to compare the vortex breakdown characteristics of these two models under static and dynamic conditions. Results indicate that the vortex burst location moves forward with increasing AOA for both the models relative to the static case, the bursting is delayed during pitch-up motion with the vortex burst lag increasing with the pitch rate. Compared with the baseline model, the small geometry modification at the strake/wing junction of the modified model changes the local flowfield by developing the wing vortex earlier and promoting earlier coiling-up of strake and wing vortices. High angle of attack aerodynamics, effect of static AOA, pitch rate dynamic motion, flow visualization by dye injection, vortex development and bursting,water tunnel studies,effect of fillet, baseline or modified double-delta wing.