The effect of delta wing shape on leading-edge vortex breakdown was investigated in the 2 x 3 ft water tunnel at Wichita State University. In this experiment, the aft one-third of a 76-deg swept delta wing was modified to obtain diamond, cropped, standard delta, and double-delta shapes. The tests were performed at a velocity U = 0.4 ft/s (i.e. 0.12 m/s), corresponding to a Reynolds number of 25 x 10(exp3). The vortex breakdown location during dynamic pitch-up and pitch-down motion was observed by dye flow visualization. Among the four shapes tested, the cropped delta wing had the longest unburst leading-edge vortex in steady flow, and the double-delta wing had the earliest vortex breakdown. The same result was shown for dynamic pitching at large angles of attack, although in the case of upward pitching at small angles of attack the graphs showing the vortex burst locations as a function for the angle of attack intersect each other in the pitch-up case. During downward pitching, with all test models vortex bursting was observed to occur significantly earlier than during upward pitching.
Diamond, cropped, delta, and double-delta wing vortex breakdown during dynamic pitching
Stabilitätsuntersuchung der Wirbelströmung auf der Saugseite von Tragflügeln unterschiedlicher Geometrie
AIAA Journal ; 35 , 3 ; 567-569
1997
3 Seiten, 2 Bilder, 19 Quellen
Article (Journal)
English
Diamond, Cropped, Delta, and Double-Delta Wing Vortex Breakdown During Dynamic Pitching (TN)
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